/* * Matroska demuxer * Copyright (C) 2004 Aurelien Jacobs * Based on the one written by Ronald Bultje for gstreamer * and on demux_mkv.cpp from Moritz Bunkus. * * This file is part of mpv. * * mpv is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * mpv is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with mpv. If not, see . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "config.h" #if HAVE_ZLIB #include #endif #include "mpv_talloc.h" #include "common/av_common.h" #include "options/m_config.h" #include "options/m_option.h" #include "misc/bstr.h" #include "stream/stream.h" #include "video/csputils.h" #include "video/mp_image.h" #include "demux.h" #include "stheader.h" #include "ebml.h" #include "matroska.h" #include "codec_tags.h" #include "common/msg.h" static const unsigned char sipr_swaps[38][2] = { {0,63},{1,22},{2,44},{3,90},{5,81},{7,31},{8,86},{9,58},{10,36},{12,68}, {13,39},{14,73},{15,53},{16,69},{17,57},{19,88},{20,34},{21,71},{24,46}, {25,94},{26,54},{28,75},{29,50},{32,70},{33,92},{35,74},{38,85},{40,56}, {42,87},{43,65},{45,59},{48,79},{49,93},{51,89},{55,95},{61,76},{67,83}, {77,80} }; // Map flavour to bytes per second #define SIPR_FLAVORS 4 #define ATRC_FLAVORS 8 #define COOK_FLAVORS 34 static const int sipr_fl2bps[SIPR_FLAVORS] = { 813, 1062, 625, 2000 }; static const int atrc_fl2bps[ATRC_FLAVORS] = { 8269, 11714, 13092, 16538, 18260, 22050, 33075, 44100 }; static const int cook_fl2bps[COOK_FLAVORS] = { 1000, 1378, 2024, 2584, 4005, 5513, 8010, 4005, 750, 2498, 4048, 5513, 8010, 11973, 8010, 2584, 4005, 2067, 2584, 2584, 4005, 4005, 5513, 5513, 8010, 12059, 1550, 8010, 12059, 5513, 12016, 16408, 22911, 33506 }; enum { MAX_NUM_LACES = 256, }; typedef struct mkv_content_encoding { uint64_t order, type, scope; uint64_t comp_algo; uint8_t *comp_settings; int comp_settings_len; } mkv_content_encoding_t; typedef struct mkv_track { int tnum; uint64_t uid; char *name; struct sh_stream *stream; char *codec_id; char *language; int type; uint32_t v_width, v_height, v_dwidth, v_dheight; bool v_dwidth_set, v_dheight_set; double v_frate; uint32_t colorspace; int stereo_mode; struct mp_colorspace color; uint32_t a_channels, a_bps; float a_sfreq; float a_osfreq; double default_duration; double codec_delay; int default_track; int forced_track; unsigned char *private_data; unsigned int private_size; bool parse; int64_t parse_timebase; void *parser_tmp; AVCodecParserContext *av_parser; AVCodecContext *av_parser_codec; bool require_keyframes; /* stuff for realaudio braincancer */ double ra_pts; /* previous audio timestamp */ uint32_t sub_packet_size; ///< sub packet size, per stream uint32_t sub_packet_h; ///< number of coded frames per block uint32_t coded_framesize; ///< coded frame size, per stream uint32_t audiopk_size; ///< audio packet size unsigned char *audio_buf; ///< place to store reordered audio data double *audio_timestamp; ///< timestamp for each audio packet uint32_t sub_packet_cnt; ///< number of subpacket already received /* generic content encoding support */ mkv_content_encoding_t *encodings; int num_encodings; /* latest added index entry for this track */ size_t last_index_entry; } mkv_track_t; typedef struct mkv_index { int tnum; int64_t timecode, duration; uint64_t filepos; // position of the cluster which contains the packet } mkv_index_t; struct block_info { uint64_t duration, discardpadding; bool simple, keyframe, duration_known; int64_t timecode; mkv_track_t *track; // Actual packet data. AVBufferRef *laces[MAX_NUM_LACES]; int num_laces; int64_t filepos; struct ebml_block_additions *additions; }; typedef struct mkv_demuxer { struct demux_mkv_opts *opts; int64_t segment_start, segment_end; double duration; mkv_track_t **tracks; int num_tracks; struct ebml_tags *tags; int64_t tc_scale, cluster_tc; uint64_t cluster_start; uint64_t cluster_end; mkv_index_t *indexes; size_t num_indexes; bool index_complete; int index_mode; int edition_id; struct header_elem { int32_t id; int64_t pos; bool parsed; } *headers; int num_headers; int64_t skip_to_timecode; int v_skip_to_keyframe, a_skip_to_keyframe; int a_skip_preroll; int subtitle_preroll; bool index_has_durations; bool eof_warning, keyframe_warning; // Small queue of read but not yet returned packets. This is mostly // temporary data, and not normally larger than 0 or 1 elements. struct block_info *blocks; int num_blocks; // Packets to return. struct demux_packet **packets; int num_packets; bool probably_webm_dash_init; } mkv_demuxer_t; #define OPT_BASE_STRUCT struct demux_mkv_opts struct demux_mkv_opts { int subtitle_preroll; double subtitle_preroll_secs; double subtitle_preroll_secs_index; int probe_duration; int probe_start_time; }; const struct m_sub_options demux_mkv_conf = { .opts = (const m_option_t[]) { {"subtitle-preroll", OPT_CHOICE(subtitle_preroll, {"no", 0}, {"yes", 1}, {"index", 2})}, {"subtitle-preroll-secs", OPT_DOUBLE(subtitle_preroll_secs), M_RANGE(0, DBL_MAX)}, {"subtitle-preroll-secs-index", OPT_DOUBLE(subtitle_preroll_secs_index), M_RANGE(0, DBL_MAX)}, {"probe-video-duration", OPT_CHOICE(probe_duration, {"no", 0}, {"yes", 1}, {"full", 2})}, {"probe-start-time", OPT_FLAG(probe_start_time)}, {0} }, .size = sizeof(struct demux_mkv_opts), .defaults = &(const struct demux_mkv_opts){ .subtitle_preroll = 2, .subtitle_preroll_secs = 1.0, .subtitle_preroll_secs_index = 10.0, .probe_start_time = 1, }, }; #define REALHEADER_SIZE 16 #define RVPROPERTIES_SIZE 34 #define RAPROPERTIES4_SIZE 56 #define RAPROPERTIES5_SIZE 70 // Maximum number of subtitle packets that are accepted for pre-roll. // (Subtitle packets added before first A/V keyframe packet is found with seek.) #define NUM_SUB_PREROLL_PACKETS 500 static void probe_last_timestamp(struct demuxer *demuxer, int64_t start_pos); static void probe_first_timestamp(struct demuxer *demuxer); static int read_next_block_into_queue(demuxer_t *demuxer); static void free_block(struct block_info *block); static void add_packet(struct demuxer *demuxer, struct sh_stream *stream, struct demux_packet *pkt) { mkv_demuxer_t *mkv_d = demuxer->priv; if (!pkt) return; pkt->stream = stream->index; MP_TARRAY_APPEND(mkv_d, mkv_d->packets, mkv_d->num_packets, pkt); } #define AAC_SYNC_EXTENSION_TYPE 0x02b7 static int aac_get_sample_rate_index(uint32_t sample_rate) { static const int srates[] = { 92017, 75132, 55426, 46009, 37566, 27713, 23004, 18783, 13856, 11502, 9391, 0 }; int i = 0; while (sample_rate < srates[i]) i++; return i; } static bstr demux_mkv_decode(struct mp_log *log, mkv_track_t *track, bstr data, uint32_t type) { uint8_t *src = data.start; uint8_t *orig_src = src; uint8_t *dest = src; uint32_t size = data.len; for (int i = 0; i < track->num_encodings; i++) { struct mkv_content_encoding *enc = track->encodings + i; if (!(enc->scope & type)) continue; if (src != dest && src != orig_src) talloc_free(src); src = dest; // output from last iteration is new source if (enc->comp_algo == 0) { #if HAVE_ZLIB /* zlib encoded track */ if (size == 0) continue; z_stream zstream; zstream.zalloc = (alloc_func) 0; zstream.zfree = (free_func) 0; zstream.opaque = (voidpf) 0; if (inflateInit(&zstream) != Z_OK) { mp_warn(log, "zlib initialization failed.\n"); goto error; } zstream.next_in = (Bytef *) src; zstream.avail_in = size; dest = NULL; zstream.avail_out = size; int result; do { if (size >= INT_MAX - 4000) { talloc_free(dest); dest = NULL; inflateEnd(&zstream); goto error; } size += 4000; dest = talloc_realloc_size(track->parser_tmp, dest, size); zstream.next_out = (Bytef *) (dest + zstream.total_out); result = inflate(&zstream, Z_NO_FLUSH); if (result != Z_OK && result != Z_STREAM_END) { mp_warn(log, "zlib decompression failed.\n"); talloc_free(dest); dest = NULL; inflateEnd(&zstream); goto error; } zstream.avail_out += 4000; } while (zstream.avail_out == 4000 && zstream.avail_in != 0 && result != Z_STREAM_END); size = zstream.total_out; inflateEnd(&zstream); #endif } else if (enc->comp_algo == 2) { /* lzo encoded track */ int out_avail; int maxlen = INT_MAX - AV_LZO_OUTPUT_PADDING; if (size >= maxlen / 3) goto error; int dstlen = size * 3; dest = NULL; while (1) { int srclen = size; dest = talloc_realloc_size(track->parser_tmp, dest, dstlen + AV_LZO_OUTPUT_PADDING); out_avail = dstlen; int result = av_lzo1x_decode(dest, &out_avail, src, &srclen); if (result == 0) break; if (!(result & AV_LZO_OUTPUT_FULL)) { mp_warn(log, "lzo decompression failed.\n"); talloc_free(dest); dest = NULL; goto error; } mp_trace(log, "lzo decompression buffer too small.\n"); if (dstlen >= maxlen / 2) { talloc_free(dest); dest = NULL; goto error; } dstlen = MPMAX(1, 2 * dstlen); } size = dstlen - out_avail; } else if (enc->comp_algo == 3) { dest = talloc_size(track->parser_tmp, size + enc->comp_settings_len); memcpy(dest, enc->comp_settings, enc->comp_settings_len); memcpy(dest + enc->comp_settings_len, src, size); size += enc->comp_settings_len; } } error: if (src != dest && src != orig_src) talloc_free(src); if (!size) dest = NULL; return (bstr){dest, size}; } static int demux_mkv_read_info(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = demuxer->priv; stream_t *s = demuxer->stream; int res = 0; MP_DBG(demuxer, "|+ segment information...\n"); mkv_d->tc_scale = 1000000; mkv_d->duration = 0; struct ebml_info info = {0}; struct ebml_parse_ctx parse_ctx = {demuxer->log}; if (ebml_read_element(s, &parse_ctx, &info, &ebml_info_desc) < 0) return -1; if (info.muxing_app) MP_DBG(demuxer, "| + muxing app: %s\n", info.muxing_app); if (info.writing_app) MP_DBG(demuxer, "| + writing app: %s\n", info.writing_app); if (info.n_timecode_scale) { mkv_d->tc_scale = info.timecode_scale; MP_DBG(demuxer, "| + timecode scale: %"PRId64"\n", mkv_d->tc_scale); if (mkv_d->tc_scale < 1 || mkv_d->tc_scale > INT_MAX) { res = -1; goto out; } } if (info.n_duration) { mkv_d->duration = info.duration * mkv_d->tc_scale / 1e9; MP_DBG(demuxer, "| + duration: %.3fs\n", mkv_d->duration); demuxer->duration = mkv_d->duration; } if (info.title) { mp_tags_set_str(demuxer->metadata, "TITLE", info.title); } if (info.n_segment_uid) { size_t len = info.segment_uid.len; if (len != sizeof(demuxer->matroska_data.uid.segment)) { MP_INFO(demuxer, "segment uid invalid length %zu\n", len); } else { memcpy(demuxer->matroska_data.uid.segment, info.segment_uid.start, len); MP_DBG(demuxer, "| + segment uid"); for (size_t i = 0; i < len; i++) MP_DBG(demuxer, " %02x", demuxer->matroska_data.uid.segment[i]); MP_DBG(demuxer, "\n"); } } if (demuxer->params && demuxer->params->matroska_wanted_uids) { if (info.n_segment_uid) { for (int i = 0; i < demuxer->params->matroska_num_wanted_uids; i++) { struct matroska_segment_uid *uid = demuxer->params->matroska_wanted_uids + i; if (!memcmp(info.segment_uid.start, uid->segment, 16)) { demuxer->matroska_data.uid.edition = uid->edition; goto out; } } } MP_VERBOSE(demuxer, "This is not one of the wanted files. " "Stopping attempt to open.\n"); res = -2; } out: talloc_free(parse_ctx.talloc_ctx); return res; } static void parse_trackencodings(struct demuxer *demuxer, struct mkv_track *track, struct ebml_content_encodings *encodings) { // initial allocation to be a non-NULL context before realloc mkv_content_encoding_t *ce = talloc_size(track, 1); for (int n_enc = 0; n_enc < encodings->n_content_encoding; n_enc++) { struct ebml_content_encoding *enc = encodings->content_encoding + n_enc; struct mkv_content_encoding e = {0}; e.order = enc->content_encoding_order; if (enc->n_content_encoding_scope) e.scope = enc->content_encoding_scope; else e.scope = 1; e.type = enc->content_encoding_type; if (enc->n_content_compression) { struct ebml_content_compression *z = &enc->content_compression; e.comp_algo = z->content_comp_algo; if (z->n_content_comp_settings) { int sz = z->content_comp_settings.len; e.comp_settings = talloc_size(ce, sz); memcpy(e.comp_settings, z->content_comp_settings.start, sz); e.comp_settings_len = sz; } } if (e.type == 1) { MP_WARN(demuxer, "Track " "number %d has been encrypted and " "decryption has not yet been\n" "implemented. Skipping track.\n", track->tnum); } else if (e.type != 0) { MP_WARN(demuxer, "Unknown content encoding type for " "track %u. Skipping track.\n", track->tnum); } else if (e.comp_algo != 0 && e.comp_algo != 2 && e.comp_algo != 3) { MP_WARN(demuxer, "Track %d has been compressed with " "an unknown/unsupported compression\n" "algorithm (%"PRIu64"). Skipping track.\n", track->tnum, e.comp_algo); } #if !HAVE_ZLIB else if (e.comp_algo == 0) { MP_WARN(demuxer, "Track %d was compressed with zlib " "but mpv has not been compiled\n" "with support for zlib compression. " "Skipping track.\n", track->tnum); } #endif int i; for (i = 0; i < n_enc; i++) { if (e.order >= ce[i].order) break; } ce = talloc_realloc(track, ce, mkv_content_encoding_t, n_enc + 1); memmove(ce + i + 1, ce + i, (n_enc - i) * sizeof(*ce)); memcpy(ce + i, &e, sizeof(e)); } track->encodings = ce; track->num_encodings = encodings->n_content_encoding; } static void parse_trackaudio(struct demuxer *demuxer, struct mkv_track *track, struct ebml_audio *audio) { if (audio->n_sampling_frequency) { track->a_sfreq = audio->sampling_frequency; MP_DBG(demuxer, "| + Sampling frequency: %f\n", track->a_sfreq); } else { track->a_sfreq = 8000; } if (audio->n_output_sampling_frequency) { track->a_osfreq = audio->output_sampling_frequency; MP_DBG(demuxer, "| + Output sampling frequency: %f\n", track->a_osfreq); } else { track->a_osfreq = track->a_sfreq; } if (audio->n_bit_depth) { track->a_bps = audio->bit_depth; MP_DBG(demuxer, "| + Bit depth: %"PRIu32"\n", track->a_bps); } if (audio->n_channels) { track->a_channels = audio->channels; MP_DBG(demuxer, "| + Channels: %"PRIu32"\n", track->a_channels); } else { track->a_channels = 1; } } static void parse_trackcolour(struct demuxer *demuxer, struct mkv_track *track, struct ebml_colour *colour) { // Note: As per matroska spec, the order is consistent with ISO/IEC // 23001-8:2013/DCOR1, which is the same order used by libavutil/pixfmt.h, // so we can just re-use our avcol_ conversion functions. if (colour->n_matrix_coefficients) { track->color.space = avcol_spc_to_mp_csp(colour->matrix_coefficients); MP_DBG(demuxer, "| + Matrix: %s\n", m_opt_choice_str(mp_csp_names, track->color.space)); } if (colour->n_primaries) { track->color.primaries = avcol_pri_to_mp_csp_prim(colour->primaries); MP_DBG(demuxer, "| + Primaries: %s\n", m_opt_choice_str(mp_csp_prim_names, track->color.primaries)); } if (colour->n_transfer_characteristics) { track->color.gamma = avcol_trc_to_mp_csp_trc(colour->transfer_characteristics); MP_DBG(demuxer, "| + Gamma: %s\n", m_opt_choice_str(mp_csp_trc_names, track->color.gamma)); } if (colour->n_range) { track->color.levels = avcol_range_to_mp_csp_levels(colour->range); MP_DBG(demuxer, "| + Levels: %s\n", m_opt_choice_str(mp_csp_levels_names, track->color.levels)); } if (colour->n_max_cll) { track->color.sig_peak = colour->max_cll / MP_REF_WHITE; MP_DBG(demuxer, "| + MaxCLL: %"PRIu64"\n", colour->max_cll); } // if MaxCLL is unavailable, try falling back to the mastering metadata if (!track->color.sig_peak && colour->n_mastering_metadata) { struct ebml_mastering_metadata *mastering = &colour->mastering_metadata; if (mastering->n_luminance_max) { track->color.sig_peak = mastering->luminance_max / MP_REF_WHITE; MP_DBG(demuxer, "| + HDR peak: %f\n", track->color.sig_peak); } } } static void parse_trackvideo(struct demuxer *demuxer, struct mkv_track *track, struct ebml_video *video) { if (video->n_frame_rate) { MP_DBG(demuxer, "| + Frame rate: %f (ignored)\n", video->frame_rate); } if (video->n_display_width) { track->v_dwidth = video->display_width; track->v_dwidth_set = true; MP_DBG(demuxer, "| + Display width: %"PRIu32"\n", track->v_dwidth); } if (video->n_display_height) { track->v_dheight = video->display_height; track->v_dheight_set = true; MP_DBG(demuxer, "| + Display height: %"PRIu32"\n", track->v_dheight); } if (video->n_pixel_width) { track->v_width = video->pixel_width; MP_DBG(demuxer, "| + Pixel width: %"PRIu32"\n", track->v_width); } if (video->n_pixel_height) { track->v_height = video->pixel_height; MP_DBG(demuxer, "| + Pixel height: %"PRIu32"\n", track->v_height); } if (video->n_colour_space && video->colour_space.len == 4) { uint8_t *d = (uint8_t *)&video->colour_space.start[0]; track->colorspace = d[0] | (d[1] << 8) | (d[2] << 16) | (d[3] << 24); MP_DBG(demuxer, "| + Colorspace: %#"PRIx32"\n", track->colorspace); } if (video->n_stereo_mode) { const char *name = MP_STEREO3D_NAME(video->stereo_mode); if (name) { track->stereo_mode = video->stereo_mode; MP_DBG(demuxer, "| + StereoMode: %s\n", name); } else { MP_WARN(demuxer, "Unknown StereoMode: %"PRIu64"\n", video->stereo_mode); } } if (video->n_colour) parse_trackcolour(demuxer, track, &video->colour); } /** * \brief free any data associated with given track * \param track track of which to free data */ static void demux_mkv_free_trackentry(mkv_track_t *track) { talloc_free(track->parser_tmp); talloc_free(track); } static void parse_trackentry(struct demuxer *demuxer, struct ebml_track_entry *entry) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; struct mkv_track *track = talloc_zero(NULL, struct mkv_track); track->last_index_entry = (size_t)-1; track->parser_tmp = talloc_new(track); track->tnum = entry->track_number; if (track->tnum) { MP_DBG(demuxer, "| + Track number: %d\n", track->tnum); } else { MP_ERR(demuxer, "Missing track number!\n"); } track->uid = entry->track_uid; if (entry->name) { track->name = talloc_strdup(track, entry->name); MP_DBG(demuxer, "| + Name: %s\n", track->name); } track->type = entry->track_type; MP_DBG(demuxer, "| + Track type: "); switch (track->type) { case MATROSKA_TRACK_AUDIO: MP_DBG(demuxer, "Audio\n"); break; case MATROSKA_TRACK_VIDEO: MP_DBG(demuxer, "Video\n"); break; case MATROSKA_TRACK_SUBTITLE: MP_DBG(demuxer, "Subtitle\n"); break; default: MP_DBG(demuxer, "unknown\n"); break; } if (entry->n_audio) { MP_DBG(demuxer, "| + Audio track\n"); parse_trackaudio(demuxer, track, &entry->audio); } if (entry->n_video) { MP_DBG(demuxer, "| + Video track\n"); parse_trackvideo(demuxer, track, &entry->video); } if (entry->codec_id) { track->codec_id = talloc_strdup(track, entry->codec_id); MP_DBG(demuxer, "| + Codec ID: %s\n", track->codec_id); } else { MP_ERR(demuxer, "Missing codec ID!\n"); track->codec_id = ""; } if (entry->n_codec_private && entry->codec_private.len <= 0x10000000) { int len = entry->codec_private.len; track->private_data = talloc_size(track, len + AV_LZO_INPUT_PADDING); memcpy(track->private_data, entry->codec_private.start, len); track->private_size = len; MP_DBG(demuxer, "| + CodecPrivate, length %u\n", track->private_size); } if (entry->language) { track->language = talloc_strdup(track, entry->language); MP_DBG(demuxer, "| + Language: %s\n", track->language); } else { track->language = talloc_strdup(track, "eng"); } if (entry->n_flag_default) { track->default_track = entry->flag_default; MP_DBG(demuxer, "| + Default flag: %d\n", track->default_track); } else { track->default_track = 1; } if (entry->n_flag_forced) { track->forced_track = entry->flag_forced; MP_DBG(demuxer, "| + Forced flag: %d\n", track->forced_track); } if (entry->n_default_duration) { track->default_duration = entry->default_duration / 1e9; if (entry->default_duration == 0) { MP_DBG(demuxer, "| + Default duration: 0"); } else { track->v_frate = 1e9 / entry->default_duration; MP_DBG(demuxer, "| + Default duration: %.3fms ( = %.3f fps)\n", entry->default_duration / 1000000.0, track->v_frate); } } if (entry->n_content_encodings) parse_trackencodings(demuxer, track, &entry->content_encodings); if (entry->n_codec_delay) track->codec_delay = entry->codec_delay / 1e9; mkv_d->tracks[mkv_d->num_tracks++] = track; } static int demux_mkv_read_tracks(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; stream_t *s = demuxer->stream; MP_DBG(demuxer, "|+ segment tracks...\n"); struct ebml_tracks tracks = {0}; struct ebml_parse_ctx parse_ctx = {demuxer->log}; if (ebml_read_element(s, &parse_ctx, &tracks, &ebml_tracks_desc) < 0) return -1; mkv_d->tracks = talloc_zero_array(mkv_d, struct mkv_track*, tracks.n_track_entry); for (int i = 0; i < tracks.n_track_entry; i++) { MP_DBG(demuxer, "| + a track...\n"); parse_trackentry(demuxer, &tracks.track_entry[i]); } talloc_free(parse_ctx.talloc_ctx); return 0; } static void cue_index_add(demuxer_t *demuxer, int track_id, uint64_t filepos, int64_t timecode, int64_t duration) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; MP_TARRAY_GROW(mkv_d, mkv_d->indexes, mkv_d->num_indexes); mkv_d->indexes[mkv_d->num_indexes] = (mkv_index_t) { .tnum = track_id, .filepos = filepos, .timecode = timecode, .duration = duration, }; mkv_d->num_indexes++; } static void add_block_position(demuxer_t *demuxer, struct mkv_track *track, uint64_t filepos, int64_t timecode, int64_t duration) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; if (mkv_d->index_complete || !track) return; mkv_d->index_has_durations = true; if (track->last_index_entry != (size_t)-1) { mkv_index_t *index = &mkv_d->indexes[track->last_index_entry]; // Never add blocks which are already covered by the index. if (index->timecode >= timecode) return; } cue_index_add(demuxer, track->tnum, filepos, timecode, duration); track->last_index_entry = mkv_d->num_indexes - 1; } static int demux_mkv_read_cues(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; stream_t *s = demuxer->stream; if (mkv_d->index_mode != 1 || mkv_d->index_complete) { ebml_read_skip(demuxer->log, -1, s); return 0; } MP_VERBOSE(demuxer, "Parsing cues...\n"); struct ebml_cues cues = {0}; struct ebml_parse_ctx parse_ctx = {demuxer->log}; if (ebml_read_element(s, &parse_ctx, &cues, &ebml_cues_desc) < 0) return -1; for (int i = 0; i < cues.n_cue_point; i++) { struct ebml_cue_point *cuepoint = &cues.cue_point[i]; if (cuepoint->n_cue_time != 1 || !cuepoint->n_cue_track_positions) { MP_WARN(demuxer, "Malformed CuePoint element\n"); goto done; } if (cuepoint->cue_time / 1e9 > mkv_d->duration / mkv_d->tc_scale * 10 && mkv_d->duration != 0) goto done; } if (cues.n_cue_point <= 3) // probably too sparse and will just break seeking goto done; // Discard incremental index. (Keep the first entry, which must be the // start of the file - helps with files that miss the first index entry.) mkv_d->num_indexes = MPMIN(1, mkv_d->num_indexes); mkv_d->index_has_durations = false; for (int i = 0; i < cues.n_cue_point; i++) { struct ebml_cue_point *cuepoint = &cues.cue_point[i]; uint64_t time = cuepoint->cue_time; for (int c = 0; c < cuepoint->n_cue_track_positions; c++) { struct ebml_cue_track_positions *trackpos = &cuepoint->cue_track_positions[c]; uint64_t pos = mkv_d->segment_start + trackpos->cue_cluster_position; cue_index_add(demuxer, trackpos->cue_track, pos, time, trackpos->cue_duration); mkv_d->index_has_durations |= trackpos->n_cue_duration > 0; MP_TRACE(demuxer, "|+ found cue point for track %"PRIu64": " "timecode %"PRIu64", filepos: %"PRIu64"" "offset %"PRIu64", duration %"PRIu64"\n", trackpos->cue_track, time, pos, trackpos->cue_relative_position, trackpos->cue_duration); } } // Do not attempt to create index on the fly. mkv_d->index_complete = true; done: if (!mkv_d->index_complete) MP_WARN(demuxer, "Discarding potentially broken or useless index.\n"); talloc_free(parse_ctx.talloc_ctx); return 0; } static int demux_mkv_read_chapters(struct demuxer *demuxer) { mkv_demuxer_t *mkv_d = demuxer->priv; stream_t *s = demuxer->stream; int wanted_edition = mkv_d->edition_id; uint64_t wanted_edition_uid = demuxer->matroska_data.uid.edition; /* A specific edition UID was requested; ignore the user option which is * only applicable to the top-level file. */ if (wanted_edition_uid) wanted_edition = -1; MP_DBG(demuxer, "Parsing chapters...\n"); struct ebml_chapters file_chapters = {0}; struct ebml_parse_ctx parse_ctx = {demuxer->log}; if (ebml_read_element(s, &parse_ctx, &file_chapters, &ebml_chapters_desc) < 0) return -1; int selected_edition = -1; int num_editions = file_chapters.n_edition_entry; struct ebml_edition_entry *editions = file_chapters.edition_entry; for (int i = 0; i < num_editions; i++) { struct demux_edition new = { .demuxer_id = editions[i].edition_uid, .default_edition = editions[i].edition_flag_default, .metadata = talloc_zero(demuxer, struct mp_tags), }; MP_TARRAY_APPEND(demuxer, demuxer->editions, demuxer->num_editions, new); } if (wanted_edition >= 0 && wanted_edition < num_editions) { selected_edition = wanted_edition; MP_VERBOSE(demuxer, "User-specified edition: %d\n", selected_edition); } else { for (int i = 0; i < num_editions; i++) { if (wanted_edition_uid && editions[i].edition_uid == wanted_edition_uid) { selected_edition = i; break; } else if (editions[i].edition_flag_default) { selected_edition = i; MP_VERBOSE(demuxer, "Default edition: %d\n", i); break; } } } if (selected_edition < 0) { if (wanted_edition_uid) { MP_ERR(demuxer, "Unable to find expected edition uid: %"PRIu64"\n", wanted_edition_uid); talloc_free(parse_ctx.talloc_ctx); return -1; } else { selected_edition = 0; } } for (int idx = 0; idx < num_editions; idx++) { MP_VERBOSE(demuxer, "New edition %d\n", idx); int warn_level = idx == selected_edition ? MSGL_WARN : MSGL_V; if (editions[idx].n_edition_flag_default) MP_VERBOSE(demuxer, "Default edition flag: %"PRIu64"\n", editions[idx].edition_flag_default); if (editions[idx].n_edition_flag_ordered) MP_VERBOSE(demuxer, "Ordered chapter flag: %"PRIu64"\n", editions[idx].edition_flag_ordered); int chapter_count = editions[idx].n_chapter_atom; struct matroska_chapter *m_chapters = NULL; if (idx == selected_edition && editions[idx].edition_flag_ordered) { m_chapters = talloc_array_ptrtype(demuxer, m_chapters, chapter_count); demuxer->matroska_data.ordered_chapters = m_chapters; demuxer->matroska_data.num_ordered_chapters = chapter_count; } for (int i = 0; i < chapter_count; i++) { struct ebml_chapter_atom *ca = editions[idx].chapter_atom + i; struct matroska_chapter chapter = {0}; char *name = "(unnamed)"; chapter.start = ca->chapter_time_start; chapter.end = ca->chapter_time_end; if (!ca->n_chapter_time_start) MP_MSG(demuxer, warn_level, "Chapter lacks start time\n"); if (!ca->n_chapter_time_start || !ca->n_chapter_time_end) { if (demuxer->matroska_data.ordered_chapters) { MP_MSG(demuxer, warn_level, "Chapter lacks start or end " "time, disabling ordered chapters.\n"); demuxer->matroska_data.ordered_chapters = NULL; demuxer->matroska_data.num_ordered_chapters = 0; } } if (ca->n_chapter_display) { if (ca->n_chapter_display > 1) MP_MSG(demuxer, warn_level, "Multiple chapter " "names not supported, picking first\n"); if (!ca->chapter_display[0].chap_string) MP_MSG(demuxer, warn_level, "Malformed chapter name entry\n"); else name = ca->chapter_display[0].chap_string; } if (ca->n_chapter_segment_uid) { chapter.has_segment_uid = true; int len = ca->chapter_segment_uid.len; if (len != sizeof(chapter.uid.segment)) MP_MSG(demuxer, warn_level, "Chapter segment uid bad length %d\n", len); else { memcpy(chapter.uid.segment, ca->chapter_segment_uid.start, len); if (ca->n_chapter_segment_edition_uid) chapter.uid.edition = ca->chapter_segment_edition_uid; else chapter.uid.edition = 0; MP_DBG(demuxer, "Chapter segment uid "); for (int n = 0; n < len; n++) MP_DBG(demuxer, "%02x ", chapter.uid.segment[n]); MP_DBG(demuxer, "\n"); } } MP_DBG(demuxer, "Chapter %u from %02d:%02d:%02d.%03d " "to %02d:%02d:%02d.%03d, %s\n", i, (int) (chapter.start / 60 / 60 / 1000000000), (int) ((chapter.start / 60 / 1000000000) % 60), (int) ((chapter.start / 1000000000) % 60), (int) (chapter.start % 1000000000), (int) (chapter.end / 60 / 60 / 1000000000), (int) ((chapter.end / 60 / 1000000000) % 60), (int) ((chapter.end / 1000000000) % 60), (int) (chapter.end % 1000000000), name); if (idx == selected_edition) { demuxer_add_chapter(demuxer, name, chapter.start / 1e9, ca->chapter_uid); } if (m_chapters) { chapter.name = talloc_strdup(m_chapters, name); m_chapters[i] = chapter; } } } demuxer->num_editions = num_editions; demuxer->edition = selected_edition; talloc_free(parse_ctx.talloc_ctx); return 0; } static int demux_mkv_read_tags(demuxer_t *demuxer) { struct mkv_demuxer *mkv_d = demuxer->priv; stream_t *s = demuxer->stream; struct ebml_parse_ctx parse_ctx = {demuxer->log}; struct ebml_tags tags = {0}; if (ebml_read_element(s, &parse_ctx, &tags, &ebml_tags_desc) < 0) return -1; mkv_d->tags = talloc_dup(mkv_d, &tags); talloc_steal(mkv_d->tags, parse_ctx.talloc_ctx); return 0; } static void process_tags(demuxer_t *demuxer) { struct mkv_demuxer *mkv_d = demuxer->priv; struct ebml_tags *tags = mkv_d->tags; if (!tags) return; for (int i = 0; i < tags->n_tag; i++) { struct ebml_tag tag = tags->tag[i]; struct mp_tags *dst = NULL; if (tag.targets.target_chapter_uid) { for (int n = 0; n < demuxer->num_chapters; n++) { if (demuxer->chapters[n].demuxer_id == tag.targets.target_chapter_uid) { dst = demuxer->chapters[n].metadata; break; } } } else if (tag.targets.target_edition_uid) { for (int n = 0; n < demuxer->num_editions; n++) { if (demuxer->editions[n].demuxer_id == tag.targets.target_edition_uid) { dst = demuxer->editions[n].metadata; break; } } } else if (tag.targets.target_track_uid) { for (int n = 0; n < mkv_d->num_tracks; n++) { if (mkv_d->tracks[n]->uid == tag.targets.target_track_uid) { struct sh_stream *sh = mkv_d->tracks[n]->stream; if (sh) dst = sh->tags; break; } } } else if (tag.targets.target_attachment_uid) { /* ignore */ } else { dst = demuxer->metadata; } if (dst) { for (int j = 0; j < tag.n_simple_tag; j++) { if (tag.simple_tag[j].tag_name && tag.simple_tag[j].tag_string) { mp_tags_set_str(dst, tag.simple_tag[j].tag_name, tag.simple_tag[j].tag_string); } } } } } static int demux_mkv_read_attachments(demuxer_t *demuxer) { stream_t *s = demuxer->stream; MP_DBG(demuxer, "Parsing attachments...\n"); struct ebml_attachments attachments = {0}; struct ebml_parse_ctx parse_ctx = {demuxer->log}; if (ebml_read_element(s, &parse_ctx, &attachments, &ebml_attachments_desc) < 0) return -1; for (int i = 0; i < attachments.n_attached_file; i++) { struct ebml_attached_file *attachment = &attachments.attached_file[i]; if (!attachment->file_name || !attachment->file_mime_type || !attachment->n_file_data) { MP_WARN(demuxer, "Malformed attachment\n"); continue; } char *name = attachment->file_name; char *mime = attachment->file_mime_type; demuxer_add_attachment(demuxer, name, mime, attachment->file_data.start, attachment->file_data.len); MP_DBG(demuxer, "Attachment: %s, %s, %zu bytes\n", name, mime, attachment->file_data.len); } talloc_free(parse_ctx.talloc_ctx); return 0; } static struct header_elem *get_header_element(struct demuxer *demuxer, uint32_t id, int64_t element_filepos) { struct mkv_demuxer *mkv_d = demuxer->priv; // Note that some files in fact contain a SEEKHEAD with a list of all // clusters - we have no use for that. if (!ebml_is_mkv_level1_id(id) || id == MATROSKA_ID_CLUSTER) return NULL; for (int n = 0; n < mkv_d->num_headers; n++) { struct header_elem *elem = &mkv_d->headers[n]; // SEEKHEAD is the only element that can happen multiple times. // Other elements might be duplicated (or attempted to be read twice, // even if it's only once in the file), but only the first is used. if (elem->id == id && (id != MATROSKA_ID_SEEKHEAD || elem->pos == element_filepos)) return elem; } struct header_elem elem = { .id = id, .pos = element_filepos }; MP_TARRAY_APPEND(mkv_d, mkv_d->headers, mkv_d->num_headers, elem); return &mkv_d->headers[mkv_d->num_headers - 1]; } // Mark the level 1 element with the given id as read. Return whether it // was marked read before (e.g. for checking whether it was already read). // element_filepos refers to the file position of the element ID. static bool test_header_element(struct demuxer *demuxer, uint32_t id, int64_t element_filepos) { struct header_elem *elem = get_header_element(demuxer, id, element_filepos); if (!elem) return false; if (elem->parsed) return true; elem->parsed = true; return false; } static int demux_mkv_read_seekhead(demuxer_t *demuxer) { struct mkv_demuxer *mkv_d = demuxer->priv; struct stream *s = demuxer->stream; int res = 0; struct ebml_seek_head seekhead = {0}; struct ebml_parse_ctx parse_ctx = {demuxer->log}; MP_DBG(demuxer, "Parsing seek head...\n"); if (ebml_read_element(s, &parse_ctx, &seekhead, &ebml_seek_head_desc) < 0) { res = -1; goto out; } for (int i = 0; i < seekhead.n_seek; i++) { struct ebml_seek *seek = &seekhead.seek[i]; if (seek->n_seek_id != 1 || seek->n_seek_position != 1) { MP_WARN(demuxer, "Invalid SeekHead entry\n"); continue; } uint64_t pos = seek->seek_position + mkv_d->segment_start; MP_TRACE(demuxer, "Element 0x%"PRIx32" at %"PRIu64".\n", seek->seek_id, pos); get_header_element(demuxer, seek->seek_id, pos); } out: talloc_free(parse_ctx.talloc_ctx); return res; } static int read_header_element(struct demuxer *demuxer, uint32_t id, int64_t start_filepos) { if (id == EBML_ID_INVALID) return 0; if (test_header_element(demuxer, id, start_filepos)) goto skip; switch(id) { case MATROSKA_ID_INFO: return demux_mkv_read_info(demuxer); case MATROSKA_ID_TRACKS: return demux_mkv_read_tracks(demuxer); case MATROSKA_ID_CUES: return demux_mkv_read_cues(demuxer); case MATROSKA_ID_TAGS: return demux_mkv_read_tags(demuxer); case MATROSKA_ID_SEEKHEAD: return demux_mkv_read_seekhead(demuxer); case MATROSKA_ID_CHAPTERS: return demux_mkv_read_chapters(demuxer); case MATROSKA_ID_ATTACHMENTS: return demux_mkv_read_attachments(demuxer); } skip: ebml_read_skip(demuxer->log, -1, demuxer->stream); return 0; } static int read_deferred_element(struct demuxer *demuxer, struct header_elem *elem) { stream_t *s = demuxer->stream; if (elem->parsed) return 0; elem->parsed = true; MP_VERBOSE(demuxer, "Seeking to %"PRIu64" to read header element " "0x%"PRIx32".\n", elem->pos, elem->id); if (!stream_seek(s, elem->pos)) { MP_WARN(demuxer, "Failed to seek when reading header element.\n"); return 0; } if (ebml_read_id(s) != elem->id) { MP_ERR(demuxer, "Expected element 0x%"PRIx32" not found\n", elem->id); return 0; } elem->parsed = false; // don't make read_header_element skip it return read_header_element(demuxer, elem->id, elem->pos); } static void read_deferred_cues(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = demuxer->priv; if (mkv_d->index_complete || mkv_d->index_mode != 1) return; for (int n = 0; n < mkv_d->num_headers; n++) { struct header_elem *elem = &mkv_d->headers[n]; if (elem->id == MATROSKA_ID_CUES) read_deferred_element(demuxer, elem); } } static void add_coverart(struct demuxer *demuxer) { for (int n = 0; n < demuxer->num_attachments; n++) { struct demux_attachment *att = &demuxer->attachments[n]; const char *codec = mp_map_mimetype_to_video_codec(att->type); if (!codec) continue; struct sh_stream *sh = demux_alloc_sh_stream(STREAM_VIDEO); sh->codec->codec = codec; sh->attached_picture = new_demux_packet_from(att->data, att->data_size); if (sh->attached_picture) { sh->attached_picture->pts = 0; talloc_steal(sh, sh->attached_picture); sh->attached_picture->keyframe = true; } sh->title = att->name; demux_add_sh_stream(demuxer, sh); } } static void init_track(demuxer_t *demuxer, mkv_track_t *track, struct sh_stream *sh) { track->stream = sh; if (track->language && (strcmp(track->language, "und") != 0)) sh->lang = track->language; sh->demuxer_id = track->tnum; sh->title = track->name; sh->default_track = track->default_track; sh->forced_track = track->forced_track; } static int demux_mkv_open_video(demuxer_t *demuxer, mkv_track_t *track); static int demux_mkv_open_audio(demuxer_t *demuxer, mkv_track_t *track); static int demux_mkv_open_sub(demuxer_t *demuxer, mkv_track_t *track); static void display_create_tracks(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; for (int i = 0; i < mkv_d->num_tracks; i++) { switch (mkv_d->tracks[i]->type) { case MATROSKA_TRACK_VIDEO: demux_mkv_open_video(demuxer, mkv_d->tracks[i]); break; case MATROSKA_TRACK_AUDIO: demux_mkv_open_audio(demuxer, mkv_d->tracks[i]); break; case MATROSKA_TRACK_SUBTITLE: demux_mkv_open_sub(demuxer, mkv_d->tracks[i]); break; } } } static const char *const mkv_video_tags[][2] = { {"V_MJPEG", "mjpeg"}, {"V_MPEG1", "mpeg1video"}, {"V_MPEG2", "mpeg2video"}, {"V_MPEG4/ISO/SP", "mpeg4"}, {"V_MPEG4/ISO/ASP", "mpeg4"}, {"V_MPEG4/ISO/AP", "mpeg4"}, {"V_MPEG4/ISO/AVC", "h264"}, {"V_MPEG4/MS/V3", "msmpeg4v3"}, {"V_THEORA", "theora"}, {"V_VP8", "vp8"}, {"V_VP9", "vp9"}, {"V_DIRAC", "dirac"}, {"V_PRORES", "prores"}, {"V_MPEGH/ISO/HEVC", "hevc"}, {"V_SNOW", "snow"}, {"V_AV1", "av1"}, {0} }; static int demux_mkv_open_video(demuxer_t *demuxer, mkv_track_t *track) { unsigned char *extradata = NULL; unsigned int extradata_size = 0; struct sh_stream *sh = demux_alloc_sh_stream(STREAM_VIDEO); init_track(demuxer, track, sh); struct mp_codec_params *sh_v = sh->codec; sh_v->bits_per_coded_sample = 24; if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")) { /* AVI compatibility mode */ // The private_data contains a BITMAPINFOHEADER struct if (track->private_data == NULL || track->private_size < 40) goto done; unsigned char *h = track->private_data; if (track->v_width == 0) track->v_width = AV_RL32(h + 4); // biWidth if (track->v_height == 0) track->v_height = AV_RL32(h + 8); // biHeight sh_v->bits_per_coded_sample = AV_RL16(h + 14); // biBitCount sh_v->codec_tag = AV_RL32(h + 16); // biCompression extradata = track->private_data + 40; extradata_size = track->private_size - 40; mp_set_codec_from_tag(sh_v); sh_v->avi_dts = true; } else if (track->private_size >= RVPROPERTIES_SIZE && (!strcmp(track->codec_id, "V_REAL/RV10") || !strcmp(track->codec_id, "V_REAL/RV20") || !strcmp(track->codec_id, "V_REAL/RV30") || !strcmp(track->codec_id, "V_REAL/RV40"))) { unsigned char *src; unsigned int cnt; src = (uint8_t *) track->private_data + RVPROPERTIES_SIZE; cnt = track->private_size - RVPROPERTIES_SIZE; uint32_t t2 = AV_RB32(src - 4); switch (t2 == 0x10003000 || t2 == 0x10003001 ? '1' : track->codec_id[9]) { case '1': sh_v->codec = "rv10"; break; case '2': sh_v->codec = "rv20"; break; case '3': sh_v->codec = "rv30"; break; case '4': sh_v->codec = "rv40"; break; } // copy type1 and type2 info from rv properties extradata_size = cnt + 8; extradata = src - 8; track->parse = true; track->parse_timebase = 1e3; } else if (strcmp(track->codec_id, "V_UNCOMPRESSED") == 0) { // raw video, "like AVI" - this is a FourCC sh_v->codec_tag = track->colorspace; sh_v->codec = "rawvideo"; } else if (strcmp(track->codec_id, "V_QUICKTIME") == 0) { uint32_t fourcc1 = 0, fourcc2 = 0; if (track->private_size >= 8) { fourcc1 = AV_RL32(track->private_data + 0); fourcc2 = AV_RL32(track->private_data + 4); } if (fourcc1 == MKTAG('S', 'V', 'Q', '3') || fourcc2 == MKTAG('S', 'V', 'Q', '3')) { sh_v->codec = "svq3"; extradata = track->private_data; extradata_size = track->private_size; } } else { for (int i = 0; mkv_video_tags[i][0]; i++) { if (!strcmp(mkv_video_tags[i][0], track->codec_id)) { sh_v->codec = mkv_video_tags[i][1]; break; } } if (track->private_data && track->private_size > 0) { extradata = track->private_data; extradata_size = track->private_size; } } const char *codec = sh_v->codec ? sh_v->codec : ""; if (!strcmp(codec, "mjpeg")) { sh_v->codec_tag = MKTAG('m', 'j', 'p', 'g'); track->require_keyframes = true; } if (extradata_size > 0x1000000) { MP_WARN(demuxer, "Invalid CodecPrivate\n"); goto done; } sh_v->extradata = talloc_memdup(sh_v, extradata, extradata_size); sh_v->extradata_size = extradata_size; if (!sh_v->codec) { MP_WARN(demuxer, "Unknown/unsupported CodecID (%s) or missing/bad " "CodecPrivate data (track %d).\n", track->codec_id, track->tnum); } sh_v->fps = track->v_frate; sh_v->disp_w = track->v_width; sh_v->disp_h = track->v_height; int dw = track->v_dwidth_set ? track->v_dwidth : track->v_width; int dh = track->v_dheight_set ? track->v_dheight : track->v_height; struct mp_image_params p = {.w = track->v_width, .h = track->v_height}; mp_image_params_set_dsize(&p, dw, dh); sh_v->par_w = p.p_w; sh_v->par_h = p.p_h; sh_v->stereo_mode = track->stereo_mode; sh_v->color = track->color; done: demux_add_sh_stream(demuxer, sh); return 0; } // Parse VorbisComment and look for WAVEFORMATEXTENSIBLE_CHANNEL_MASK. // Do not change *channels if nothing found or an error happens. static void parse_vorbis_chmap(struct mp_chmap *channels, unsigned char *data, int size) { // Skip the useless vendor string. if (size < 4) return; uint32_t vendor_length = AV_RL32(data); if (vendor_length + 4 > size) // also check for the next AV_RB32 below return; size -= vendor_length + 4; data += vendor_length + 4; uint32_t num_headers = AV_RL32(data); size -= 4; data += 4; for (int n = 0; n < num_headers; n++) { if (size < 4) return; uint32_t len = AV_RL32(data); size -= 4; data += 4; if (len > size) return; if (len > 34 && !memcmp(data, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK=", 34)) { char smask[80]; snprintf(smask, sizeof(smask), "%.*s", (int)(len - 34), data + 34); char *end = NULL; uint32_t mask = strtol(smask, &end, 0); if (!end || end[0]) mask = 0; struct mp_chmap chmask = {0}; mp_chmap_from_waveext(&chmask, mask); if (mp_chmap_is_valid(&chmask)) *channels = chmask; } size -= len; data += len; } } // Parse VorbisComment-in-FLAC and look for WAVEFORMATEXTENSIBLE_CHANNEL_MASK. // Do not change *channels if nothing found or an error happens. static void parse_flac_chmap(struct mp_chmap *channels, unsigned char *data, int size) { // Skip FLAC header. if (size < 4) return; data += 4; size -= 4; // Parse FLAC blocks... while (size >= 4) { unsigned btype = data[0] & 0x7F; unsigned bsize = AV_RB24(data + 1); data += 4; size -= 4; if (bsize > size) return; if (btype == 4) // VORBIS_COMMENT parse_vorbis_chmap(channels, data, bsize); data += bsize; size -= bsize; } } static const char *const mkv_audio_tags[][2] = { { "A_MPEG/L2", "mp2" }, { "A_MPEG/L3", "mp3" }, { "A_AC3", "ac3" }, { "A_EAC3", "eac3" }, { "A_DTS", "dts" }, { "A_AAC", "aac" }, { "A_VORBIS", "vorbis" }, { "A_OPUS", "opus" }, { "A_OPUS/EXPERIMENTAL", "opus" }, { "A_QUICKTIME/QDMC", "qdmc" }, { "A_QUICKTIME/QDM2", "qdm2" }, { "A_WAVPACK4", "wavpack" }, { "A_TRUEHD", "truehd" }, { "A_FLAC", "flac" }, { "A_ALAC", "alac" }, { "A_TTA1", "tta" }, { "A_MLP", "mlp" }, { NULL }, }; static int demux_mkv_open_audio(demuxer_t *demuxer, mkv_track_t *track) { struct sh_stream *sh = demux_alloc_sh_stream(STREAM_AUDIO); init_track(demuxer, track, sh); struct mp_codec_params *sh_a = sh->codec; if (track->private_size > 0x1000000) goto error; unsigned char *extradata = track->private_data; unsigned int extradata_len = track->private_size; if (!track->a_osfreq) track->a_osfreq = track->a_sfreq; sh_a->bits_per_coded_sample = track->a_bps ? track->a_bps : 16; sh_a->samplerate = (uint32_t) track->a_osfreq; mp_chmap_set_unknown(&sh_a->channels, track->a_channels); for (int i = 0; mkv_audio_tags[i][0]; i++) { if (!strcmp(mkv_audio_tags[i][0], track->codec_id)) { sh_a->codec = mkv_audio_tags[i][1]; break; } } if (!strcmp(track->codec_id, "A_MS/ACM")) { /* AVI compatibility mode */ // The private_data contains a WAVEFORMATEX struct if (track->private_size < 18) goto error; MP_DBG(demuxer, "track with MS compat audio.\n"); unsigned char *h = track->private_data; sh_a->codec_tag = AV_RL16(h + 0); // wFormatTag if (track->a_channels == 0) track->a_channels = AV_RL16(h + 2); // nChannels if (sh_a->samplerate == 0) sh_a->samplerate = AV_RL32(h + 4); // nSamplesPerSec sh_a->bitrate = AV_RL32(h + 8) * 8; // nAvgBytesPerSec sh_a->block_align = AV_RL16(h + 12); // nBlockAlign if (track->a_bps == 0) track->a_bps = AV_RL16(h + 14); // wBitsPerSample extradata = track->private_data + 18; extradata_len = track->private_size - 18; sh_a->bits_per_coded_sample = track->a_bps; sh_a->extradata = extradata; sh_a->extradata_size = extradata_len; mp_set_codec_from_tag(sh_a); extradata = sh_a->extradata; extradata_len = sh_a->extradata_size; } else if (!strcmp(track->codec_id, "A_PCM/INT/LIT")) { bool sign = sh_a->bits_per_coded_sample > 8; mp_set_pcm_codec(sh_a, sign, false, sh_a->bits_per_coded_sample, false); } else if (!strcmp(track->codec_id, "A_PCM/INT/BIG")) { bool sign = sh_a->bits_per_coded_sample > 8; mp_set_pcm_codec(sh_a, sign, false, sh_a->bits_per_coded_sample, true); } else if (!strcmp(track->codec_id, "A_PCM/FLOAT/IEEE")) { sh_a->codec = sh_a->bits_per_coded_sample == 64 ? "pcm_f64le" : "pcm_f32le"; } else if (!strncmp(track->codec_id, "A_REAL/", 7)) { if (track->private_size < RAPROPERTIES4_SIZE) goto error; /* Common initialization for all RealAudio codecs */ unsigned char *src = track->private_data; int version = AV_RB16(src + 4); unsigned int flavor = AV_RB16(src + 22); track->coded_framesize = AV_RB32(src + 24); track->sub_packet_h = AV_RB16(src + 40); sh_a->block_align = track->audiopk_size = AV_RB16(src + 42); track->sub_packet_size = AV_RB16(src + 44); int offset = 0; if (version == 4) { offset += RAPROPERTIES4_SIZE; if (offset + 1 > track->private_size) goto error; offset += (src[offset] + 1) * 2 + 3; } else { offset += RAPROPERTIES5_SIZE + 3 + (version == 5 ? 1 : 0); } if (track->audiopk_size == 0 || track->sub_packet_size == 0 || track->sub_packet_h == 0 || track->coded_framesize == 0) goto error; if (track->coded_framesize > 0x40000000) goto error; if (offset + 4 > track->private_size) goto error; uint32_t codecdata_length = AV_RB32(src + offset); offset += 4; if (offset > track->private_size || codecdata_length > track->private_size - offset) goto error; extradata_len = codecdata_length; extradata = src + offset; if (!strcmp(track->codec_id, "A_REAL/ATRC")) { sh_a->codec = "atrac3"; if (flavor >= MP_ARRAY_SIZE(atrc_fl2bps)) goto error; sh_a->bitrate = atrc_fl2bps[flavor] * 8; sh_a->block_align = track->sub_packet_size; } else if (!strcmp(track->codec_id, "A_REAL/COOK")) { sh_a->codec = "cook"; if (flavor >= MP_ARRAY_SIZE(cook_fl2bps)) goto error; sh_a->bitrate = cook_fl2bps[flavor] * 8; sh_a->block_align = track->sub_packet_size; } else if (!strcmp(track->codec_id, "A_REAL/SIPR")) { sh_a->codec = "sipr"; if (flavor >= MP_ARRAY_SIZE(sipr_fl2bps)) goto error; sh_a->bitrate = sipr_fl2bps[flavor] * 8; sh_a->block_align = track->coded_framesize; } else if (!strcmp(track->codec_id, "A_REAL/28_8")) { sh_a->codec = "ra_288"; sh_a->bitrate = 3600 * 8; sh_a->block_align = track->coded_framesize; } else if (!strcmp(track->codec_id, "A_REAL/DNET")) { sh_a->codec = "ac3"; } else { goto error; } track->audio_buf = talloc_array_size(track, track->sub_packet_h, track->audiopk_size); track->audio_timestamp = talloc_array(track, double, track->sub_packet_h); } else if (!strncmp(track->codec_id, "A_AAC/", 6)) { sh_a->codec = "aac"; /* Recreate the 'private data' (not needed for plain A_AAC) */ int srate_idx = aac_get_sample_rate_index(track->a_sfreq); const char *tail = ""; if (strlen(track->codec_id) >= 12) tail = &track->codec_id[12]; int profile = 3; if (!strncmp(tail, "MAIN", 4)) profile = 0; else if (!strncmp(tail, "LC", 2)) profile = 1; else if (!strncmp(tail, "SSR", 3)) profile = 2; extradata = talloc_size(sh_a, 5); extradata[0] = ((profile + 1) << 3) | ((srate_idx & 0xE) >> 1); extradata[1] = ((srate_idx & 0x1) << 7) | (track->a_channels << 3); if (strstr(track->codec_id, "SBR") != NULL) { /* HE-AAC (aka SBR AAC) */ extradata_len = 5; srate_idx = aac_get_sample_rate_index(sh_a->samplerate); extradata[2] = AAC_SYNC_EXTENSION_TYPE >> 3; extradata[3] = ((AAC_SYNC_EXTENSION_TYPE & 0x07) << 5) | 5; extradata[4] = (1 << 7) | (srate_idx << 3); track->default_duration = 1024.0 / (sh_a->samplerate / 2); } else { extradata_len = 2; track->default_duration = 1024.0 / sh_a->samplerate; } } else if (!strncmp(track->codec_id, "A_AC3/", 6)) { sh_a->codec = "ac3"; } else if (!strncmp(track->codec_id, "A_EAC3/", 7)) { sh_a->codec = "eac3"; } if (!sh_a->codec) goto error; const char *codec = sh_a->codec; if (!strcmp(codec, "mp2") || !strcmp(codec, "mp3") || !strcmp(codec, "truehd") || !strcmp(codec, "eac3")) { track->parse = true; } else if (!strcmp(codec, "flac")) { unsigned char *ptr = extradata; unsigned int size = extradata_len; if (size < 4 || ptr[0] != 'f' || ptr[1] != 'L' || ptr[2] != 'a' || ptr[3] != 'C') { extradata = talloc_size(sh_a, 4); extradata_len = 4; memcpy(extradata, "fLaC", 4); } parse_flac_chmap(&sh_a->channels, extradata, extradata_len); } else if (!strcmp(codec, "alac")) { if (track->private_size) { extradata_len = track->private_size + 12; extradata = talloc_size(sh_a, extradata_len); char *data = extradata; AV_WB32(data + 0, extradata_len); memcpy(data + 4, "alac", 4); AV_WB32(data + 8, 0); memcpy(data + 12, track->private_data, track->private_size); } } else if (!strcmp(codec, "tta")) { extradata_len = 30; extradata = talloc_zero_size(sh_a, extradata_len); if (!extradata) goto error; char *data = extradata; memcpy(data + 0, "TTA1", 4); AV_WL16(data + 4, 1); AV_WL16(data + 6, sh_a->channels.num); AV_WL16(data + 8, sh_a->bits_per_coded_sample); AV_WL32(data + 10, track->a_osfreq); // Bogus: last frame won't be played. AV_WL32(data + 14, 0); } else if (!strcmp(codec, "opus")) { // Hardcode the rate libavcodec's opus decoder outputs, so that // AV_PKT_DATA_SKIP_SAMPLES actually works. The Matroska header only // has an arbitrary "input" samplerate, while libavcodec is fixed to // output 48000. sh_a->samplerate = 48000; } // Some files have broken default DefaultDuration set, which will lead to // audio packets with incorrect timestamps. This follows FFmpeg commit // 6158a3b, sample see FFmpeg ticket 2508. if (sh_a->samplerate == 8000 && strcmp(codec, "ac3") == 0) track->default_duration = 0; // Deal with some FFmpeg-produced garbage, and assume all audio codecs can // start decoding from anywhere. if (strcmp(codec, "truehd") != 0) track->require_keyframes = true; sh_a->extradata = extradata; sh_a->extradata_size = extradata_len; sh->seek_preroll = track->codec_delay; demux_add_sh_stream(demuxer, sh); return 0; error: MP_WARN(demuxer, "Unknown/unsupported audio " "codec ID '%s' for track %u or missing/faulty\n" "private codec data.\n", track->codec_id, track->tnum); demux_add_sh_stream(demuxer, sh); // add it anyway return 1; } static const char *const mkv_sub_tag[][2] = { { "S_VOBSUB", "dvd_subtitle" }, { "S_TEXT/SSA", "ass"}, { "S_TEXT/ASS", "ass"}, { "S_SSA", "ass"}, { "S_ASS", "ass"}, { "S_TEXT/ASCII", "subrip"}, { "S_TEXT/UTF8", "subrip"}, { "S_HDMV/PGS", "hdmv_pgs_subtitle"}, { "D_WEBVTT/SUBTITLES", "webvtt-webm"}, { "D_WEBVTT/CAPTIONS", "webvtt-webm"}, { "S_TEXT/WEBVTT", "webvtt"}, { "S_DVBSUB", "dvb_subtitle"}, {0} }; static int demux_mkv_open_sub(demuxer_t *demuxer, mkv_track_t *track) { const char *subtitle_type = NULL; for (int n = 0; mkv_sub_tag[n][0]; n++) { if (strcmp(track->codec_id, mkv_sub_tag[n][0]) == 0) { subtitle_type = mkv_sub_tag[n][1]; break; } } if (track->private_size > 0x10000000) return 1; struct sh_stream *sh = demux_alloc_sh_stream(STREAM_SUB); init_track(demuxer, track, sh); sh->codec->codec = subtitle_type; bstr in = (bstr){track->private_data, track->private_size}; bstr buffer = demux_mkv_decode(demuxer->log, track, in, 2); if (buffer.start && buffer.start != track->private_data) { talloc_free(track->private_data); talloc_steal(track, buffer.start); track->private_data = buffer.start; track->private_size = buffer.len; } sh->codec->extradata = track->private_data; sh->codec->extradata_size = track->private_size; demux_add_sh_stream(demuxer, sh); if (!subtitle_type) MP_ERR(demuxer, "Subtitle type '%s' is not supported.\n", track->codec_id); return 0; } static void probe_x264_garbage(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = demuxer->priv; for (int n = 0; n < mkv_d->num_tracks; n++) { mkv_track_t *track = mkv_d->tracks[n]; struct sh_stream *sh = track->stream; if (!sh || sh->type != STREAM_VIDEO) continue; if (sh->codec->codec && strcmp(sh->codec->codec, "h264") != 0) continue; struct block_info *block = NULL; // Find first block for this track. // Restrict reading number of total packets. (Arbitrary to avoid bloat.) for (int i = 0; i < 100; i++) { if (i >= mkv_d->num_blocks && read_next_block_into_queue(demuxer) < 1) break; if (mkv_d->blocks[i].track == track) { block = &mkv_d->blocks[i]; break; } } if (!block || block->num_laces < 1) continue; bstr sblock = {block->laces[0]->data, block->laces[0]->size}; bstr nblock = demux_mkv_decode(demuxer->log, track, sblock, 1); sh->codec->first_packet = new_demux_packet_from(nblock.start, nblock.len); talloc_steal(mkv_d, sh->codec->first_packet); if (nblock.start != sblock.start) talloc_free(nblock.start); } } static int read_ebml_header(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = demuxer->priv; stream_t *s = demuxer->stream; if (ebml_read_id(s) != EBML_ID_EBML) return 0; struct ebml_ebml ebml_master = {0}; struct ebml_parse_ctx parse_ctx = { demuxer->log, .no_error_messages = true }; if (ebml_read_element(s, &parse_ctx, &ebml_master, &ebml_ebml_desc) < 0) return 0; bool is_matroska = false, is_webm = false; if (!ebml_master.doc_type) { MP_VERBOSE(demuxer, "File has EBML header but no doctype. " "Assuming \"matroska\".\n"); is_matroska = true; } else if (strcmp(ebml_master.doc_type, "matroska") == 0) { is_matroska = true; } else if (strcmp(ebml_master.doc_type, "webm") == 0) { is_webm = true; } if (!is_matroska && !is_webm) { MP_TRACE(demuxer, "no head found\n"); talloc_free(parse_ctx.talloc_ctx); return 0; } mkv_d->probably_webm_dash_init &= is_webm; if (ebml_master.doc_type_read_version > 2) { MP_WARN(demuxer, "This looks like a Matroska file, " "but we don't support format version %"PRIu64"\n", ebml_master.doc_type_read_version); talloc_free(parse_ctx.talloc_ctx); return 0; } if ((ebml_master.n_ebml_read_version && ebml_master.ebml_read_version != EBML_VERSION) || (ebml_master.n_ebml_max_size_length && ebml_master.ebml_max_size_length > 8) || (ebml_master.n_ebml_max_id_length && ebml_master.ebml_max_id_length != 4)) { MP_WARN(demuxer, "This looks like a Matroska file, " "but the header has bad parameters\n"); talloc_free(parse_ctx.talloc_ctx); return 0; } talloc_free(parse_ctx.talloc_ctx); return 1; } static int read_mkv_segment_header(demuxer_t *demuxer, int64_t *segment_end) { stream_t *s = demuxer->stream; int num_skip = 0; if (demuxer->params) num_skip = demuxer->params->matroska_wanted_segment; while (stream_read_peek(s, &(char){0}, 1)) { if (ebml_read_id(s) != MATROSKA_ID_SEGMENT) { MP_VERBOSE(demuxer, "segment not found\n"); return 0; } MP_DBG(demuxer, "+ a segment...\n"); uint64_t len = ebml_read_length(s); *segment_end = (len == EBML_UINT_INVALID) ? 0 : stream_tell(s) + len; if (num_skip <= 0) return 1; num_skip--; MP_DBG(demuxer, " (skipping)\n"); if (*segment_end <= 0) break; if (*segment_end >= stream_get_size(s)) return 0; if (!stream_seek(s, *segment_end)) { MP_WARN(demuxer, "Failed to seek in file\n"); return 0; } // Segments are like concatenated Matroska files if (!read_ebml_header(demuxer)) return 0; } MP_VERBOSE(demuxer, "End of file, no further segments.\n"); return 0; } static int demux_mkv_open(demuxer_t *demuxer, enum demux_check check) { stream_t *s = demuxer->stream; mkv_demuxer_t *mkv_d; int64_t start_pos; int64_t end_pos; mkv_d = talloc_zero(demuxer, struct mkv_demuxer); demuxer->priv = mkv_d; mkv_d->tc_scale = 1000000; mkv_d->a_skip_preroll = 1; mkv_d->skip_to_timecode = INT64_MIN; if (demuxer->params) mkv_d->probably_webm_dash_init = demuxer->params->init_fragment.len > 0; // Make sure you can seek back after read_ebml_header() if no EBML ID. if (stream_read_peek(s, &(char[4]){0}, 4) != 4) return -1; if (!read_ebml_header(demuxer)) return -1; MP_DBG(demuxer, "Found the head...\n"); if (!read_mkv_segment_header(demuxer, &end_pos)) return -1; mkv_d->segment_start = stream_tell(s); mkv_d->segment_end = end_pos; mp_read_option_raw(demuxer->global, "index", &m_option_type_choice, &mkv_d->index_mode); mp_read_option_raw(demuxer->global, "edition", &m_option_type_choice, &mkv_d->edition_id); mkv_d->opts = mp_get_config_group(mkv_d, demuxer->global, &demux_mkv_conf); if (demuxer->params && demuxer->params->matroska_was_valid) *demuxer->params->matroska_was_valid = true; while (1) { start_pos = stream_tell(s); uint32_t id = ebml_read_id(s); if (s->eof) { if (!mkv_d->probably_webm_dash_init) MP_WARN(demuxer, "Unexpected end of file (no clusters found)\n"); break; } if (id == MATROSKA_ID_CLUSTER) { MP_DBG(demuxer, "|+ found cluster\n"); mkv_d->cluster_start = start_pos; break; } int res = read_header_element(demuxer, id, start_pos); if (res < 0) return -1; } int64_t end = stream_get_size(s); // Read headers that come after the first cluster (i.e. require seeking). // Note: reading might increase ->num_headers. // Likewise, ->headers might be reallocated. int only_cue = -1; for (int n = 0; n < mkv_d->num_headers; n++) { struct header_elem *elem = &mkv_d->headers[n]; if (elem->parsed) continue; // Warn against incomplete files and skip headers outside of range. if (elem->pos >= end || !s->seekable) { elem->parsed = true; // don't bother if file is incomplete if (end < 0 || !s->seekable) { MP_WARN(demuxer, "Stream is not seekable or unknown size, " "not reading mkv metadata at end of file.\n"); } else if (!mkv_d->eof_warning && !(mkv_d->probably_webm_dash_init && elem->pos == end)) { MP_WARN(demuxer, "mkv metadata beyond end of file - incomplete " "file?\n"); mkv_d->eof_warning = true; } continue; } only_cue = only_cue < 0 && elem->id == MATROSKA_ID_CUES; } // If there's only 1 needed element, and it's the cues, defer reading. if (only_cue == 1) { // Read cues when they are needed, to avoid seeking on opening. MP_VERBOSE(demuxer, "Deferring reading cues.\n"); } else { // Read them by ascending position to reduce unneeded seeks. // O(n^2) because the number of elements is very low. while (1) { struct header_elem *lowest = NULL; for (int n = 0; n < mkv_d->num_headers; n++) { struct header_elem *elem = &mkv_d->headers[n]; if (elem->parsed) continue; if (!lowest || elem->pos < lowest->pos) lowest = elem; } if (!lowest) break; if (read_deferred_element(demuxer, lowest) < 0) return -1; } } if (!stream_seek(s, start_pos)) { MP_ERR(demuxer, "Couldn't seek back after reading headers?\n"); return -1; } MP_VERBOSE(demuxer, "All headers are parsed!\n"); display_create_tracks(demuxer); add_coverart(demuxer); process_tags(demuxer); probe_first_timestamp(demuxer); if (mkv_d->opts->probe_duration) probe_last_timestamp(demuxer, start_pos); probe_x264_garbage(demuxer); return 0; } // Read the laced block data at the current stream position (until endpos as // indicated by the block length field) into individual buffers. static int demux_mkv_read_block_lacing(struct block_info *block, int type, struct stream *s, uint64_t endpos) { int laces; uint32_t lace_size[MAX_NUM_LACES]; if (type == 0) { /* no lacing */ laces = 1; lace_size[0] = endpos - stream_tell(s); } else { laces = stream_read_char(s); if (laces < 0 || stream_tell(s) > endpos) goto error; laces += 1; switch (type) { case 1: { /* xiph lacing */ uint32_t total = 0; for (int i = 0; i < laces - 1; i++) { lace_size[i] = 0; uint8_t t; do { t = stream_read_char(s); if (s->eof || stream_tell(s) >= endpos) goto error; lace_size[i] += t; } while (t == 0xFF); total += lace_size[i]; } uint32_t rest_length = endpos - stream_tell(s); lace_size[laces - 1] = rest_length - total; break; } case 2: { /* fixed-size lacing */ uint32_t full_length = endpos - stream_tell(s); for (int i = 0; i < laces; i++) lace_size[i] = full_length / laces; break; } case 3: { /* EBML lacing */ uint64_t num = ebml_read_length(s); if (num == EBML_UINT_INVALID || stream_tell(s) >= endpos) goto error; uint32_t total = lace_size[0] = num; for (int i = 1; i < laces - 1; i++) { int64_t snum = ebml_read_signed_length(s); if (snum == EBML_INT_INVALID || stream_tell(s) >= endpos) goto error; lace_size[i] = lace_size[i - 1] + snum; total += lace_size[i]; } uint32_t rest_length = endpos - stream_tell(s); lace_size[laces - 1] = rest_length - total; break; } default: goto error; } } for (int i = 0; i < laces; i++) { uint32_t size = lace_size[i]; if (stream_tell(s) + size > endpos || size > (1 << 30)) goto error; int pad = MPMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_INPUT_PADDING); AVBufferRef *buf = av_buffer_alloc(size + pad); if (!buf) goto error; buf->size = size; if (stream_read(s, buf->data, buf->size) != buf->size) { av_buffer_unref(&buf); goto error; } memset(buf->data + buf->size, 0, pad); block->laces[block->num_laces++] = buf; } if (stream_tell(s) != endpos) goto error; return 0; error: return 1; } // Return whether the packet was handled & freed. static bool handle_realaudio(demuxer_t *demuxer, mkv_track_t *track, struct demux_packet *orig) { uint32_t sps = track->sub_packet_size; uint32_t sph = track->sub_packet_h; uint32_t cfs = track->coded_framesize; // restricted to [1,0x40000000] uint32_t w = track->audiopk_size; uint32_t spc = track->sub_packet_cnt; uint8_t *buffer = orig->buffer; uint32_t size = orig->len; demux_packet_t *dp; // track->audio_buf allocation size size_t audiobuf_size = sph * w; if (!track->audio_buf || !track->audio_timestamp || !track->stream) return false; const char *codec = track->stream->codec->codec ? track->stream->codec->codec : ""; if (!strcmp(codec, "ra_288")) { for (int x = 0; x < sph / 2; x++) { uint64_t dst_offset = x * 2 * w + spc * (uint64_t)cfs; if (dst_offset + cfs > audiobuf_size) goto error; uint64_t src_offset = x * (uint64_t)cfs; if (src_offset + cfs > size) goto error; memcpy(track->audio_buf + dst_offset, buffer + src_offset, cfs); } } else if (!strcmp(codec, "cook") || !strcmp(codec, "atrac3")) { for (int x = 0; x < w / sps; x++) { uint32_t dst_offset = sps * (sph * x + ((sph + 1) / 2) * (spc & 1) + (spc >> 1)); if (dst_offset + sps > audiobuf_size) goto error; uint32_t src_offset = sps * x; if (src_offset + sps > size) goto error; memcpy(track->audio_buf + dst_offset, buffer + src_offset, sps); } } else if (!strcmp(codec, "sipr")) { if (spc * w + w > audiobuf_size || w > size) goto error; memcpy(track->audio_buf + spc * w, buffer, w); if (spc == sph - 1) { int n; int bs = sph * w * 2 / 96; // nibbles per subpacket // Perform reordering for (n = 0; n < 38; n++) { unsigned int i = bs * sipr_swaps[n][0]; // 77 max unsigned int o = bs * sipr_swaps[n][1]; // 95 max // swap nibbles of block 'i' with 'o' for (int j = 0; j < bs; j++) { if (i / 2 >= audiobuf_size || o / 2 >= audiobuf_size) goto error; uint8_t iv = track->audio_buf[i / 2]; uint8_t ov = track->audio_buf[o / 2]; int x = (i & 1) ? iv >> 4 : iv & 0x0F; int y = (o & 1) ? ov >> 4 : ov & 0x0F; track->audio_buf[o / 2] = (ov & 0x0F) | (o & 1 ? x << 4 : x); track->audio_buf[i / 2] = (iv & 0x0F) | (i & 1 ? y << 4 : y); i++; o++; } } } } else { // Not a codec that requires reordering return false; } track->audio_timestamp[track->sub_packet_cnt] = track->ra_pts == orig->pts ? 0 : orig->pts; track->ra_pts = orig->pts; if (++(track->sub_packet_cnt) == sph) { track->sub_packet_cnt = 0; // apk_usize has same range as coded_framesize in worst case uint32_t apk_usize = track->stream->codec->block_align; if (apk_usize > audiobuf_size) goto error; // Release all the audio packets for (int x = 0; x < sph * w / apk_usize; x++) { dp = new_demux_packet_from(track->audio_buf + x * apk_usize, apk_usize); if (!dp) goto error; /* Put timestamp only on packets that correspond to original * audio packets in file */ dp->pts = (x * apk_usize % w) ? MP_NOPTS_VALUE : track->audio_timestamp[x * apk_usize / w]; dp->pos = orig->pos + x; dp->keyframe = !x; // Mark first packet as keyframe add_packet(demuxer, track->stream, dp); } } error: talloc_free(orig); return true; } static void mkv_seek_reset(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = demuxer->priv; for (int i = 0; i < mkv_d->num_tracks; i++) { mkv_track_t *track = mkv_d->tracks[i]; if (track->av_parser) av_parser_close(track->av_parser); track->av_parser = NULL; avcodec_free_context(&track->av_parser_codec); } for (int n = 0; n < mkv_d->num_blocks; n++) free_block(&mkv_d->blocks[n]); mkv_d->num_blocks = 0; for (int n = 0; n < mkv_d->num_packets; n++) talloc_free(mkv_d->packets[n]); mkv_d->num_packets = 0; mkv_d->skip_to_timecode = INT64_MIN; } // Copied from libavformat/matroskadec.c (FFmpeg 310f9dd / 2013-05-30) // Originally added with Libav commit 9b6f47c // License: LGPL v2.1 or later // Author header: The FFmpeg Project (this function still came from Libav) // Modified to use talloc, removed ffmpeg/libav specific error codes. static int libav_parse_wavpack(mkv_track_t *track, uint8_t *src, uint8_t **pdst, int *size) { uint8_t *dst = NULL; int dstlen = 0; int srclen = *size; uint32_t samples; uint16_t ver; int offset = 0; if (srclen < 12 || track->private_size < 2) return -1; ver = AV_RL16(track->private_data); samples = AV_RL32(src); src += 4; srclen -= 4; while (srclen >= 8) { int multiblock; uint32_t blocksize; uint8_t *tmp; uint32_t flags = AV_RL32(src); uint32_t crc = AV_RL32(src + 4); src += 8; srclen -= 8; multiblock = (flags & 0x1800) != 0x1800; if (multiblock) { if (srclen < 4) goto fail; blocksize = AV_RL32(src); src += 4; srclen -= 4; } else { blocksize = srclen; } if (blocksize > srclen) goto fail; if (dstlen > 0x10000000 || blocksize > 0x10000000) goto fail; tmp = talloc_realloc(track->parser_tmp, dst, uint8_t, dstlen + blocksize + 32); if (!tmp) goto fail; dst = tmp; dstlen += blocksize + 32; AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8 AV_WL16(dst + offset + 8, ver); // version AV_WL16(dst + offset + 10, 0); // track/index_no AV_WL32(dst + offset + 12, 0); // total samples AV_WL32(dst + offset + 16, 0); // block index AV_WL32(dst + offset + 20, samples); // number of samples AV_WL32(dst + offset + 24, flags); // flags AV_WL32(dst + offset + 28, crc); // crc memcpy (dst + offset + 32, src, blocksize); // block data src += blocksize; srclen -= blocksize; offset += blocksize + 32; } *pdst = dst; *size = dstlen; return 0; fail: talloc_free(dst); return -1; } static void mkv_parse_and_add_packet(demuxer_t *demuxer, mkv_track_t *track, struct demux_packet *dp) { struct sh_stream *stream = track->stream; if (stream->type == STREAM_AUDIO && handle_realaudio(demuxer, track, dp)) return; if (strcmp(stream->codec->codec, "wavpack") == 0) { int size = dp->len; uint8_t *parsed; if (libav_parse_wavpack(track, dp->buffer, &parsed, &size) >= 0) { struct demux_packet *new = new_demux_packet_from(parsed, size); if (new) { demux_packet_copy_attribs(new, dp); talloc_free(dp); add_packet(demuxer, stream, new); return; } } } if (strcmp(stream->codec->codec, "prores") == 0) { size_t newlen = dp->len + 8; struct demux_packet *new = new_demux_packet(newlen); if (new) { AV_WB32(new->buffer + 0, newlen); AV_WB32(new->buffer + 4, MKBETAG('i', 'c', 'p', 'f')); memcpy(new->buffer + 8, dp->buffer, dp->len); demux_packet_copy_attribs(new, dp); talloc_free(dp); add_packet(demuxer, stream, new); return; } } if (track->parse && !track->av_parser) { int id = mp_codec_to_av_codec_id(track->stream->codec->codec); const AVCodec *codec = avcodec_find_decoder(id); track->av_parser = av_parser_init(id); if (codec) track->av_parser_codec = avcodec_alloc_context3(codec); } if (!track->parse || !track->av_parser || !track->av_parser_codec) { add_packet(demuxer, stream, dp); return; } double tb = track->parse_timebase; int64_t pts = dp->pts == MP_NOPTS_VALUE ? AV_NOPTS_VALUE : dp->pts * tb; int64_t dts = dp->dts == MP_NOPTS_VALUE ? AV_NOPTS_VALUE : dp->dts * tb; bool copy_sidedata = true; while (dp->len) { uint8_t *data = NULL; int size = 0; int len = av_parser_parse2(track->av_parser, track->av_parser_codec, &data, &size, dp->buffer, dp->len, pts, dts, 0); if (len < 0 || len > dp->len) break; dp->buffer += len; dp->len -= len; dp->pos += len; if (size) { struct demux_packet *new = new_demux_packet_from(data, size); if (!new) break; if (copy_sidedata) av_packet_copy_props(new->avpacket, dp->avpacket); copy_sidedata = false; demux_packet_copy_attribs(new, dp); if (track->parse_timebase) { new->pts = track->av_parser->pts == AV_NOPTS_VALUE ? MP_NOPTS_VALUE : track->av_parser->pts / tb; new->dts = track->av_parser->dts == AV_NOPTS_VALUE ? MP_NOPTS_VALUE : track->av_parser->dts / tb; } add_packet(demuxer, stream, new); } pts = dts = AV_NOPTS_VALUE; } if (dp->len) { add_packet(demuxer, stream, dp); } else { talloc_free(dp); } } static void free_block(struct block_info *block) { for (int n = 0; n < block->num_laces; n++) av_buffer_unref(&block->laces[n]); block->num_laces = 0; TA_FREEP(&block->additions); } static void index_block(demuxer_t *demuxer, struct block_info *block) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; if (block->keyframe) { add_block_position(demuxer, block->track, mkv_d->cluster_start, block->timecode / mkv_d->tc_scale, block->duration / mkv_d->tc_scale); } } static int read_block(demuxer_t *demuxer, int64_t end, struct block_info *block) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; stream_t *s = demuxer->stream; uint64_t num; int16_t time; uint64_t length; free_block(block); length = ebml_read_length(s); if (!length || length > 500000000 || stream_tell(s) + length > (uint64_t)end) return -1; uint64_t endpos = stream_tell(s) + length; int res = -1; // Parse header of the Block element /* first byte(s): track num */ num = ebml_read_length(s); if (num == EBML_UINT_INVALID || stream_tell(s) >= endpos) goto exit; /* time (relative to cluster time) */ if (stream_tell(s) + 3 > endpos) goto exit; uint8_t c1 = stream_read_char(s); uint8_t c2 = stream_read_char(s); time = c1 << 8 | c2; uint8_t header_flags = stream_read_char(s); block->filepos = stream_tell(s); int lace_type = (header_flags >> 1) & 0x03; if (demux_mkv_read_block_lacing(block, lace_type, s, endpos)) goto exit; if (block->simple) block->keyframe = header_flags & 0x80; block->timecode = time * mkv_d->tc_scale + mkv_d->cluster_tc; for (int i = 0; i < mkv_d->num_tracks; i++) { if (mkv_d->tracks[i]->tnum == num) { block->track = mkv_d->tracks[i]; break; } } if (!block->track) { res = 0; goto exit; } if (stream_tell(s) != endpos) goto exit; res = 1; exit: if (res <= 0) free_block(block); stream_seek_skip(s, endpos); return res; } static int handle_block(demuxer_t *demuxer, struct block_info *block_info) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; double current_pts; bool keyframe = block_info->keyframe; uint64_t block_duration = block_info->duration; int64_t tc = block_info->timecode; mkv_track_t *track = block_info->track; struct sh_stream *stream = track->stream; bool use_this_block = tc >= mkv_d->skip_to_timecode; if (!demux_stream_is_selected(stream)) return 0; current_pts = tc / 1e9 - track->codec_delay; if (track->require_keyframes && !keyframe) { keyframe = true; if (!mkv_d->keyframe_warning) { MP_WARN(demuxer, "This is a broken file! Packets with incorrect " "keyframe flag found. Enabling workaround.\n"); mkv_d->keyframe_warning = true; } } if (track->type == MATROSKA_TRACK_AUDIO) { if (mkv_d->a_skip_to_keyframe) use_this_block &= keyframe; } else if (track->type == MATROSKA_TRACK_SUBTITLE) { if (!use_this_block && mkv_d->subtitle_preroll) { int64_t end_time = block_info->timecode + block_info->duration; if (!block_info->duration) end_time = INT64_MAX; use_this_block = end_time > mkv_d->skip_to_timecode; if (use_this_block) { if (mkv_d->subtitle_preroll) { mkv_d->subtitle_preroll--; } else { // This could overflow the demuxer queue. use_this_block = 0; } } } if (use_this_block) { if (block_info->num_laces > 1) { MP_WARN(demuxer, "Subtitles use Matroska " "lacing. This is abnormal and not supported.\n"); use_this_block = 0; } } } else if (track->type == MATROSKA_TRACK_VIDEO) { if (mkv_d->v_skip_to_keyframe) use_this_block &= keyframe; } if (use_this_block) { uint64_t filepos = block_info->filepos; for (int i = 0; i < block_info->num_laces; i++) { AVBufferRef *data = block_info->laces[i]; demux_packet_t *dp = NULL; bstr block = {data->data, data->size}; bstr nblock = demux_mkv_decode(demuxer->log, track, block, 1); if (block.start != nblock.start || block.len != nblock.len) { // (avoidable copy of the entire data) dp = new_demux_packet_from(nblock.start, nblock.len); } else { dp = new_demux_packet_from_buf(data); } if (!dp) break; dp->pos = filepos; /* If default_duration is 0, assume no pts value is known * for packets after the first one (rather than all pts * values being the same). Also, don't use it for extra * packets resulting from parsing. */ if (i == 0 || track->default_duration) { dp->pts = current_pts + i * track->default_duration; dp->keyframe = keyframe; } if (stream->codec->avi_dts) MPSWAP(double, dp->pts, dp->dts); if (i == 0 && block_info->duration_known) dp->duration = block_duration / 1e9; if (stream->type == STREAM_AUDIO) { unsigned int srate = stream->codec->samplerate; demux_packet_set_padding(dp, 0, block_info->discardpadding / 1e9 * srate); mkv_d->a_skip_preroll = 0; } if (block_info->additions) { for (int n = 0; n < block_info->additions->n_block_more; n++) { struct ebml_block_more *add = &block_info->additions->block_more[n]; int64_t id = add->n_block_add_id ? add->block_add_id : 1; demux_packet_add_blockadditional(dp, id, add->block_additional.start, add->block_additional.len); } } mkv_parse_and_add_packet(demuxer, track, dp); talloc_free_children(track->parser_tmp); filepos += data->size; } if (stream->type == STREAM_VIDEO) { mkv_d->v_skip_to_keyframe = 0; mkv_d->skip_to_timecode = INT64_MIN; mkv_d->subtitle_preroll = 0; } else if (stream->type == STREAM_AUDIO) { mkv_d->a_skip_to_keyframe = 0; } return 1; } return 0; } static int read_block_group(demuxer_t *demuxer, int64_t end, struct block_info *block) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; stream_t *s = demuxer->stream; *block = (struct block_info){ .keyframe = true }; while (stream_tell(s) < end) { switch (ebml_read_id(s)) { case MATROSKA_ID_BLOCKDURATION: block->duration = ebml_read_uint(s); if (block->duration == EBML_UINT_INVALID) goto error; block->duration *= mkv_d->tc_scale; block->duration_known = true; break; case MATROSKA_ID_DISCARDPADDING: block->discardpadding = ebml_read_uint(s); if (block->discardpadding == EBML_UINT_INVALID) goto error; break; case MATROSKA_ID_BLOCK: if (read_block(demuxer, end, block) < 0) goto error; break; case MATROSKA_ID_REFERENCEBLOCK:; int64_t num = ebml_read_int(s); if (num == EBML_INT_INVALID) goto error; block->keyframe = false; break; case MATROSKA_ID_BLOCKADDITIONS:; struct ebml_block_additions additions = {0}; struct ebml_parse_ctx parse_ctx = {demuxer->log}; if (ebml_read_element(s, &parse_ctx, &additions, &ebml_block_additions_desc) < 0) return -1; if (additions.n_block_more > 0) { block->additions = talloc_dup(NULL, &additions); talloc_steal(block->additions, parse_ctx.talloc_ctx); parse_ctx.talloc_ctx = NULL; } talloc_free(parse_ctx.talloc_ctx); break; case MATROSKA_ID_CLUSTER: case EBML_ID_INVALID: goto error; default: if (ebml_read_skip(demuxer->log, end, s) != 0) goto error; break; } } return block->num_laces ? 1 : 0; error: free_block(block); return -1; } static int read_next_block_into_queue(demuxer_t *demuxer) { mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv; stream_t *s = demuxer->stream; struct block_info block = {0}; while (1) { while (stream_tell(s) < mkv_d->cluster_end) { int64_t start_filepos = stream_tell(s); switch (ebml_read_id(s)) { case MATROSKA_ID_TIMECODE: { uint64_t num = ebml_read_uint(s); if (num == EBML_UINT_INVALID) goto find_next_cluster; mkv_d->cluster_tc = num * mkv_d->tc_scale; break; } case MATROSKA_ID_BLOCKGROUP: { int64_t end = ebml_read_length(s); end += stream_tell(s); if (end > mkv_d->cluster_end) goto find_next_cluster; int res = read_block_group(demuxer, end, &block); if (res < 0) goto find_next_cluster; if (res > 0) goto add_block; break; } case MATROSKA_ID_SIMPLEBLOCK: { block = (struct block_info){ .simple = true }; int res = read_block(demuxer, mkv_d->cluster_end, &block); if (res < 0) goto find_next_cluster; if (res > 0) goto add_block; break; } case MATROSKA_ID_CLUSTER: mkv_d->cluster_start = start_filepos; goto next_cluster; case EBML_ID_INVALID: goto find_next_cluster; default: ; if (ebml_read_skip(demuxer->log, mkv_d->cluster_end, s) != 0) goto find_next_cluster; break; } } find_next_cluster: mkv_d->cluster_end = 0; for (;;) { mkv_d->cluster_start = stream_tell(s); uint32_t id = ebml_read_id(s); if (id == MATROSKA_ID_CLUSTER) break; if (s->eof) return -1; if (demux_cancel_test(demuxer)) return -1; if (id == EBML_ID_EBML && stream_tell(s) >= mkv_d->segment_end) { // Appended segment - don't use its clusters, consider this EOF. stream_seek(s, stream_tell(s) - 4); return -1; } // For the sake of robustness, consider even unknown level 1 // elements the same as unknown/broken IDs. if ((!ebml_is_mkv_level1_id(id) && id != EBML_ID_VOID) || ebml_read_skip(demuxer->log, -1, s) != 0) { stream_seek(s, mkv_d->cluster_start); ebml_resync_cluster(demuxer->log, s); } } next_cluster: mkv_d->cluster_end = ebml_read_length(s); // mkv files for "streaming" can have this legally if (mkv_d->cluster_end != EBML_UINT_INVALID) mkv_d->cluster_end += stream_tell(s); } assert(0); // unreachable add_block: index_block(demuxer, &block); MP_TARRAY_APPEND(mkv_d, mkv_d->blocks, mkv_d->num_blocks, block); return 1; } static int read_next_block(demuxer_t *demuxer, struct block_info *block) { mkv_demuxer_t *mkv_d = demuxer->priv; if (!mkv_d->num_blocks) { int res = read_next_block_into_queue(demuxer); if (res < 1) return res; assert(mkv_d->num_blocks); } *block = mkv_d->blocks[0]; MP_TARRAY_REMOVE_AT(mkv_d->blocks, mkv_d->num_blocks, 0); return 1; } static bool demux_mkv_read_packet(struct demuxer *demuxer, struct demux_packet **pkt) { struct mkv_demuxer *mkv_d = demuxer->priv; for (;;) { if (mkv_d->num_packets) { *pkt = mkv_d->packets[0]; MP_TARRAY_REMOVE_AT(mkv_d->packets, mkv_d->num_packets, 0); return true; } int res; struct block_info block; res = read_next_block(demuxer, &block); if (res < 0) return false; if (res > 0) { handle_block(demuxer, &block); free_block(&block); } } } static mkv_index_t *get_highest_index_entry(struct demuxer *demuxer) { struct mkv_demuxer *mkv_d = demuxer->priv; assert(!mkv_d->index_complete); // would require separate code mkv_index_t *index = NULL; for (int n = 0; n < mkv_d->num_tracks; n++) { int n_index = mkv_d->tracks[n]->last_index_entry; if (n_index >= 0) { mkv_index_t *index2 = &mkv_d->indexes[n_index]; if (!index || index2->filepos > index->filepos) index = index2; } } return index; } static int create_index_until(struct demuxer *demuxer, int64_t timecode) { struct mkv_demuxer *mkv_d = demuxer->priv; struct stream *s = demuxer->stream; read_deferred_cues(demuxer); if (mkv_d->index_complete) return 0; mkv_index_t *index = get_highest_index_entry(demuxer); if (!index || index->timecode * mkv_d->tc_scale < timecode) { stream_seek(s, index ? index->filepos : mkv_d->cluster_start); MP_VERBOSE(demuxer, "creating index until TC %"PRId64"\n", timecode); for (;;) { int res; struct block_info block; res = read_next_block(demuxer, &block); if (res < 0) break; if (res > 0) { free_block(&block); } index = get_highest_index_entry(demuxer); if (index && index->timecode * mkv_d->tc_scale >= timecode) break; } } if (!mkv_d->indexes) { MP_WARN(demuxer, "no target for seek found\n"); return -1; } return 0; } static struct mkv_index *seek_with_cues(struct demuxer *demuxer, int seek_id, int64_t target_timecode, int flags) { struct mkv_demuxer *mkv_d = demuxer->priv; struct mkv_index *index = NULL; int64_t min_diff = INT64_MIN; for (size_t i = 0; i < mkv_d->num_indexes; i++) { if (seek_id < 0 || mkv_d->indexes[i].tnum == seek_id) { int64_t diff = mkv_d->indexes[i].timecode * mkv_d->tc_scale - target_timecode; if (flags & SEEK_FORWARD) diff = -diff; if (min_diff != INT64_MIN) { if (diff <= 0) { if (min_diff <= 0 && diff <= min_diff) continue; } else if (diff >= min_diff) continue; } min_diff = diff; index = mkv_d->indexes + i; } } if (index) { /* We've found an entry. */ uint64_t seek_pos = index->filepos; if (flags & SEEK_HR) { // Find the cluster with the highest filepos, that has a timestamp // still lower than min_tc. double secs = mkv_d->opts->subtitle_preroll_secs; if (mkv_d->index_has_durations) secs = MPMAX(secs, mkv_d->opts->subtitle_preroll_secs_index); double pre_f = secs * 1e9 / mkv_d->tc_scale; int64_t pre = pre_f >= (double)INT64_MAX ? INT64_MAX : (int64_t)pre_f; int64_t min_tc = pre < index->timecode ? index->timecode - pre : 0; uint64_t prev_target = 0; int64_t prev_tc = 0; for (size_t i = 0; i < mkv_d->num_indexes; i++) { if (seek_id < 0 || mkv_d->indexes[i].tnum == seek_id) { struct mkv_index *cur = &mkv_d->indexes[i]; if (cur->timecode <= min_tc && cur->timecode >= prev_tc) { prev_tc = cur->timecode; prev_target = cur->filepos; } } } if (mkv_d->index_has_durations) { // Find the earliest cluster that is not before prev_target, // but contains subtitle packets overlapping with the cluster // at seek_pos. uint64_t target = seek_pos; for (size_t i = 0; i < mkv_d->num_indexes; i++) { struct mkv_index *cur = &mkv_d->indexes[i]; if (cur->timecode <= index->timecode && cur->timecode + cur->duration > index->timecode && cur->filepos >= prev_target && cur->filepos < target) { target = cur->filepos; } } prev_target = target; } if (prev_target) seek_pos = prev_target; } mkv_d->cluster_end = 0; stream_seek(demuxer->stream, seek_pos); } return index; } static void demux_mkv_seek(demuxer_t *demuxer, double seek_pts, int flags) { mkv_demuxer_t *mkv_d = demuxer->priv; int64_t old_pos = stream_tell(demuxer->stream); uint64_t v_tnum = -1; uint64_t a_tnum = -1; bool st_active[STREAM_TYPE_COUNT] = {0}; mkv_seek_reset(demuxer); for (int i = 0; i < mkv_d->num_tracks; i++) { mkv_track_t *track = mkv_d->tracks[i]; if (demux_stream_is_selected(track->stream)) { st_active[track->stream->type] = true; if (track->type == MATROSKA_TRACK_VIDEO) v_tnum = track->tnum; if (track->type == MATROSKA_TRACK_AUDIO) a_tnum = track->tnum; } } mkv_d->subtitle_preroll = NUM_SUB_PREROLL_PACKETS; int preroll_opt = mkv_d->opts->subtitle_preroll; if (preroll_opt == 1 || (preroll_opt == 2 && mkv_d->index_has_durations)) flags |= SEEK_HR; if (!st_active[STREAM_SUB]) flags &= ~SEEK_HR; // Adjust the target a little bit to catch cases where the target position // specifies a keyframe with high, but not perfect, precision. seek_pts += flags & SEEK_FORWARD ? -0.005 : 0.005; if (!(flags & SEEK_FACTOR)) { /* time in secs */ mkv_index_t *index = NULL; seek_pts = MPMAX(seek_pts, 0); int64_t target_timecode = seek_pts * 1e9 + 0.5; if (create_index_until(demuxer, target_timecode) >= 0) { int seek_id = st_active[STREAM_VIDEO] ? v_tnum : a_tnum; index = seek_with_cues(demuxer, seek_id, target_timecode, flags); if (!index) index = seek_with_cues(demuxer, -1, target_timecode, flags); } if (!index) stream_seek(demuxer->stream, old_pos); if (flags & SEEK_FORWARD) { mkv_d->skip_to_timecode = target_timecode; } else { mkv_d->skip_to_timecode = index ? index->timecode * mkv_d->tc_scale : INT64_MIN; } } else { stream_t *s = demuxer->stream; read_deferred_cues(demuxer); int64_t size = stream_get_size(s); int64_t target_filepos = size * MPCLAMP(seek_pts, 0, 1); mkv_index_t *index = NULL; if (mkv_d->index_complete) { for (size_t i = 0; i < mkv_d->num_indexes; i++) { if (mkv_d->indexes[i].tnum == v_tnum) { if ((index == NULL) || ((mkv_d->indexes[i].filepos >= target_filepos) && ((index->filepos < target_filepos) || (mkv_d->indexes[i].filepos < index->filepos)))) index = &mkv_d->indexes[i]; } } } mkv_d->cluster_end = 0; if (index) { stream_seek(s, index->filepos); mkv_d->skip_to_timecode = index->timecode * mkv_d->tc_scale; } else { stream_seek(s, MPMAX(target_filepos, 0)); if (ebml_resync_cluster(mp_null_log, s) < 0) { // Assume EOF mkv_d->cluster_end = size; } } } mkv_d->v_skip_to_keyframe = st_active[STREAM_VIDEO]; mkv_d->a_skip_to_keyframe = st_active[STREAM_AUDIO]; mkv_d->a_skip_preroll = mkv_d->a_skip_to_keyframe; } static void probe_last_timestamp(struct demuxer *demuxer, int64_t start_pos) { mkv_demuxer_t *mkv_d = demuxer->priv; if (!demuxer->seekable) return; // Pick some arbitrary video track int v_tnum = -1; for (int n = 0; n < mkv_d->num_tracks; n++) { if (mkv_d->tracks[n]->type == MATROSKA_TRACK_VIDEO) { v_tnum = mkv_d->tracks[n]->tnum; break; } } if (v_tnum < 0) return; // In full mode, we start reading data from the current file position, // which works because this function is called after headers are parsed. if (mkv_d->opts->probe_duration != 2) { read_deferred_cues(demuxer); if (mkv_d->index_complete) { // Find last cluster that still has video packets int64_t target = 0; for (size_t i = 0; i < mkv_d->num_indexes; i++) { struct mkv_index *cur = &mkv_d->indexes[i]; if (cur->tnum == v_tnum) target = MPMAX(target, cur->filepos); } if (!target) return; if (!stream_seek(demuxer->stream, target)) return; } else { // No index -> just try to find a random cluster towards file end. int64_t size = stream_get_size(demuxer->stream); stream_seek(demuxer->stream, MPMAX(size - 10 * 1024 * 1024, 0)); if (ebml_resync_cluster(mp_null_log, demuxer->stream) < 0) stream_seek(demuxer->stream, start_pos); // full scan otherwise } } mkv_seek_reset(demuxer); int64_t last_ts[STREAM_TYPE_COUNT] = {0}; while (1) { struct block_info block; int res = read_next_block(demuxer, &block); if (res < 0) break; if (res > 0) { if (block.track && block.track->stream) { enum stream_type type = block.track->stream->type; uint64_t endtime = block.timecode + block.duration; if (last_ts[type] < endtime) last_ts[type] = endtime; } free_block(&block); } } if (!last_ts[STREAM_VIDEO]) last_ts[STREAM_VIDEO] = mkv_d->cluster_tc; if (last_ts[STREAM_VIDEO]) { mkv_d->duration = last_ts[STREAM_VIDEO] / 1e9 - demuxer->start_time; demuxer->duration = mkv_d->duration; } stream_seek(demuxer->stream, start_pos); mkv_d->cluster_start = mkv_d->cluster_end = 0; } static void probe_first_timestamp(struct demuxer *demuxer) { mkv_demuxer_t *mkv_d = demuxer->priv; if (!mkv_d->opts->probe_start_time) return; read_next_block_into_queue(demuxer); demuxer->start_time = mkv_d->cluster_tc / 1e9; if (demuxer->start_time) MP_VERBOSE(demuxer, "Start PTS: %f\n", demuxer->start_time); } static void mkv_free(struct demuxer *demuxer) { struct mkv_demuxer *mkv_d = demuxer->priv; if (!mkv_d) return; mkv_seek_reset(demuxer); for (int i = 0; i < mkv_d->num_tracks; i++) demux_mkv_free_trackentry(mkv_d->tracks[i]); } const demuxer_desc_t demuxer_desc_matroska = { .name = "mkv", .desc = "Matroska", .open = demux_mkv_open, .read_packet = demux_mkv_read_packet, .close = mkv_free, .seek = demux_mkv_seek, .load_timeline = build_ordered_chapter_timeline, }; bool demux_matroska_uid_cmp(struct matroska_segment_uid *a, struct matroska_segment_uid *b) { return (!memcmp(a->segment, b->segment, 16) && a->edition == b->edition); }