/* * ASF compatible demuxer * Copyright (c) 2000, 2001 Fabrice Bellard * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/attributes.h" #include "libavutil/avassert.h" #include "libavutil/avstring.h" #include "libavutil/bswap.h" #include "libavutil/common.h" #include "libavutil/dict.h" #include "libavutil/internal.h" #include "libavutil/mathematics.h" #include "libavutil/opt.h" #include "avformat.h" #include "avio_internal.h" #include "avlanguage.h" #include "id3v2.h" #include "internal.h" #include "riff.h" #include "asf.h" #include "asfcrypt.h" typedef struct { const AVClass *class; int asfid2avid[128]; ///< conversion table from asf ID 2 AVStream ID ASFStream streams[128]; ///< it's max number and it's not that big uint32_t stream_bitrates[128]; ///< max number of streams, bitrate for each (for streaming) AVRational dar[128]; char stream_languages[128][6]; ///< max number of streams, language for each (RFC1766, e.g. en-US) /* non streamed additonnal info */ /* packet filling */ int packet_size_left; /* only for reading */ uint64_t data_offset; ///< beginning of the first data packet uint64_t data_object_offset; ///< data object offset (excl. GUID & size) uint64_t data_object_size; ///< size of the data object int index_read; ASFMainHeader hdr; int packet_flags; int packet_property; int packet_timestamp; int packet_segsizetype; int packet_segments; int packet_seq; int packet_replic_size; int packet_key_frame; int packet_padsize; unsigned int packet_frag_offset; unsigned int packet_frag_size; int64_t packet_frag_timestamp; int packet_multi_size; int packet_obj_size; int packet_time_delta; int packet_time_start; int64_t packet_pos; int stream_index; ASFStream *asf_st; ///< currently decoded stream int no_resync_search; } ASFContext; static const AVOption options[] = { { "no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM }, { NULL }, }; static const AVClass asf_class = { .class_name = "asf demuxer", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; #undef NDEBUG #include #define ASF_MAX_STREAMS 127 #define FRAME_HEADER_SIZE 17 // Fix Me! FRAME_HEADER_SIZE may be different. static const ff_asf_guid index_guid = { 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb }; #ifdef DEBUG static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */ 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2 }; #define PRINT_IF_GUID(g, cmp) \ if (!ff_guidcmp(g, &cmp)) \ av_dlog(NULL, "(GUID: %s) ", # cmp) static void print_guid(ff_asf_guid *g) { int i; PRINT_IF_GUID(g, ff_asf_header); else PRINT_IF_GUID(g, ff_asf_file_header); else PRINT_IF_GUID(g, ff_asf_stream_header); else PRINT_IF_GUID(g, ff_asf_audio_stream); else PRINT_IF_GUID(g, ff_asf_audio_conceal_none); else PRINT_IF_GUID(g, ff_asf_video_stream); else PRINT_IF_GUID(g, ff_asf_video_conceal_none); else PRINT_IF_GUID(g, ff_asf_command_stream); else PRINT_IF_GUID(g, ff_asf_comment_header); else PRINT_IF_GUID(g, ff_asf_codec_comment_header); else PRINT_IF_GUID(g, ff_asf_codec_comment1_header); else PRINT_IF_GUID(g, ff_asf_data_header); else PRINT_IF_GUID(g, index_guid); else PRINT_IF_GUID(g, ff_asf_head1_guid); else PRINT_IF_GUID(g, ff_asf_head2_guid); else PRINT_IF_GUID(g, ff_asf_my_guid); else PRINT_IF_GUID(g, ff_asf_ext_stream_header); else PRINT_IF_GUID(g, ff_asf_extended_content_header); else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header); else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream); else PRINT_IF_GUID(g, ff_asf_metadata_header); else PRINT_IF_GUID(g, ff_asf_metadata_library_header); else PRINT_IF_GUID(g, ff_asf_marker_header); else PRINT_IF_GUID(g, stream_bitrate_guid); else PRINT_IF_GUID(g, ff_asf_language_guid); else av_dlog(NULL, "(GUID: unknown) "); for (i = 0; i < 16; i++) av_dlog(NULL, " 0x%02x,", (*g)[i]); av_dlog(NULL, "}\n"); } #undef PRINT_IF_GUID #else #define print_guid(g) #endif static int asf_probe(AVProbeData *pd) { /* check file header */ if (!ff_guidcmp(pd->buf, &ff_asf_header)) return AVPROBE_SCORE_MAX; else return 0; } /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object" * but 16 bit for "Metadata Object" and "Metadata Library Object" */ static int get_value(AVIOContext *pb, int type, int type2_size) { switch (type) { case 2: return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb); case 3: return avio_rl32(pb); case 4: return avio_rl64(pb); case 5: return avio_rl16(pb); default: return INT_MIN; } } /* MSDN claims that this should be "compatible with the ID3 frame, APIC", * but in reality this is only loosely similar */ static int asf_read_picture(AVFormatContext *s, int len) { AVPacket pkt = { 0 }; const CodecMime *mime = ff_id3v2_mime_tags; enum AVCodecID id = AV_CODEC_ID_NONE; char mimetype[64]; uint8_t *desc = NULL; AVStream *st = NULL; int ret, type, picsize, desc_len; /* type + picsize + mime + desc */ if (len < 1 + 4 + 2 + 2) { av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len); return AVERROR_INVALIDDATA; } /* picture type */ type = avio_r8(s->pb); len--; if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) { av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type); type = 0; } /* picture data size */ picsize = avio_rl32(s->pb); len -= 4; /* picture MIME type */ len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype)); while (mime->id != AV_CODEC_ID_NONE) { if (!strncmp(mime->str, mimetype, sizeof(mimetype))) { id = mime->id; break; } mime++; } if (id == AV_CODEC_ID_NONE) { av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n", mimetype); return 0; } if (picsize >= len) { av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n", picsize, len); return AVERROR_INVALIDDATA; } /* picture description */ desc_len = (len - picsize) * 2 + 1; desc = av_malloc(desc_len); if (!desc) return AVERROR(ENOMEM); len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len); ret = av_get_packet(s->pb, &pkt, picsize); if (ret < 0) goto fail; st = avformat_new_stream(s, NULL); if (!st) { ret = AVERROR(ENOMEM); goto fail; } st->disposition |= AV_DISPOSITION_ATTACHED_PIC; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = id; st->attached_pic = pkt; st->attached_pic.stream_index = st->index; st->attached_pic.flags |= AV_PKT_FLAG_KEY; if (*desc) av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL); else av_freep(&desc); av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0); return 0; fail: av_freep(&desc); av_free_packet(&pkt); return ret; } static void get_id3_tag(AVFormatContext *s, int len) { ID3v2ExtraMeta *id3v2_extra_meta = NULL; ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta); if (id3v2_extra_meta) ff_id3v2_parse_apic(s, &id3v2_extra_meta); ff_id3v2_free_extra_meta(&id3v2_extra_meta); } static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size) { char *value; int64_t off = avio_tell(s->pb); if ((unsigned)len >= (UINT_MAX - 1) / 2) return; value = av_malloc(2 * len + 1); if (!value) goto finish; if (type == 0) { // UTF16-LE avio_get_str16le(s->pb, len, value, 2 * len + 1); } else if (type == 1) { // byte array if (!strcmp(key, "WM/Picture")) { // handle cover art asf_read_picture(s, len); } else if (!strcmp(key, "ID3")) { // handle ID3 tag get_id3_tag(s, len); } else { av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key); } goto finish; } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD uint64_t num = get_value(s->pb, type, type2_size); snprintf(value, len, "%"PRIu64, num); } else if (type == 6) { // (don't) handle GUID av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key); goto finish; } else { av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key); goto finish; } if (*value) av_dict_set(&s->metadata, key, value, 0); finish: av_freep(&value); avio_seek(s->pb, off + len, SEEK_SET); } static int asf_read_file_properties(AVFormatContext *s, int64_t size) { ASFContext *asf = s->priv_data; AVIOContext *pb = s->pb; ff_get_guid(pb, &asf->hdr.guid); asf->hdr.file_size = avio_rl64(pb); asf->hdr.create_time = avio_rl64(pb); avio_rl64(pb); /* number of packets */ asf->hdr.play_time = avio_rl64(pb); asf->hdr.send_time = avio_rl64(pb); asf->hdr.preroll = avio_rl32(pb); asf->hdr.ignore = avio_rl32(pb); asf->hdr.flags = avio_rl32(pb); asf->hdr.min_pktsize = avio_rl32(pb); asf->hdr.max_pktsize = avio_rl32(pb); if (asf->hdr.min_pktsize >= (1U << 29)) return AVERROR_INVALIDDATA; asf->hdr.max_bitrate = avio_rl32(pb); s->packet_size = asf->hdr.max_pktsize; return 0; } static int asf_read_stream_properties(AVFormatContext *s, int64_t size) { ASFContext *asf = s->priv_data; AVIOContext *pb = s->pb; AVStream *st; ASFStream *asf_st; ff_asf_guid g; enum AVMediaType type; int type_specific_size, sizeX; unsigned int tag1; int64_t pos1, pos2, start_time; int test_for_ext_stream_audio, is_dvr_ms_audio = 0; if (s->nb_streams == ASF_MAX_STREAMS) { av_log(s, AV_LOG_ERROR, "too many streams\n"); return AVERROR(EINVAL); } pos1 = avio_tell(pb); st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */ asf_st = av_mallocz(sizeof(ASFStream)); if (!asf_st) return AVERROR(ENOMEM); st->priv_data = asf_st; st->start_time = 0; start_time = asf->hdr.preroll; asf_st->stream_language_index = 128; // invalid stream index means no language info if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming... st->duration = asf->hdr.play_time / (10000000 / 1000) - start_time; } ff_get_guid(pb, &g); test_for_ext_stream_audio = 0; if (!ff_guidcmp(&g, &ff_asf_audio_stream)) { type = AVMEDIA_TYPE_AUDIO; } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) { type = AVMEDIA_TYPE_VIDEO; } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) { type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = AV_CODEC_ID_MJPEG; } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) { type = AVMEDIA_TYPE_DATA; } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) { test_for_ext_stream_audio = 1; type = AVMEDIA_TYPE_UNKNOWN; } else { return -1; } ff_get_guid(pb, &g); avio_skip(pb, 8); /* total_size */ type_specific_size = avio_rl32(pb); avio_rl32(pb); st->id = avio_rl16(pb) & 0x7f; /* stream id */ // mapping of asf ID to AV stream ID; asf->asfid2avid[st->id] = s->nb_streams - 1; avio_rl32(pb); if (test_for_ext_stream_audio) { ff_get_guid(pb, &g); if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) { type = AVMEDIA_TYPE_AUDIO; is_dvr_ms_audio = 1; ff_get_guid(pb, &g); avio_rl32(pb); avio_rl32(pb); avio_rl32(pb); ff_get_guid(pb, &g); avio_rl32(pb); } } st->codec->codec_type = type; if (type == AVMEDIA_TYPE_AUDIO) { int ret = ff_get_wav_header(pb, st->codec, type_specific_size); if (ret < 0) return ret; if (is_dvr_ms_audio) { // codec_id and codec_tag are unreliable in dvr_ms // files. Set them later by probing stream. st->codec->codec_id = AV_CODEC_ID_PROBE; st->codec->codec_tag = 0; } if (st->codec->codec_id == AV_CODEC_ID_AAC) st->need_parsing = AVSTREAM_PARSE_NONE; else st->need_parsing = AVSTREAM_PARSE_FULL; /* We have to init the frame size at some point .... */ pos2 = avio_tell(pb); if (size >= (pos2 + 8 - pos1 + 24)) { asf_st->ds_span = avio_r8(pb); asf_st->ds_packet_size = avio_rl16(pb); asf_st->ds_chunk_size = avio_rl16(pb); avio_rl16(pb); // ds_data_size avio_r8(pb); // ds_silence_data } if (asf_st->ds_span > 1) { if (!asf_st->ds_chunk_size || (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) || asf_st->ds_packet_size % asf_st->ds_chunk_size) asf_st->ds_span = 0; // disable descrambling } } else if (type == AVMEDIA_TYPE_VIDEO && size - (avio_tell(pb) - pos1 + 24) >= 51) { avio_rl32(pb); avio_rl32(pb); avio_r8(pb); avio_rl16(pb); /* size */ sizeX = avio_rl32(pb); /* size */ st->codec->width = avio_rl32(pb); st->codec->height = avio_rl32(pb); /* not available for asf */ avio_rl16(pb); /* panes */ st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */ tag1 = avio_rl32(pb); avio_skip(pb, 20); if (sizeX > 40) { st->codec->extradata_size = sizeX - 40; st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); avio_read(pb, st->codec->extradata, st->codec->extradata_size); } /* Extract palette from extradata if bpp <= 8 */ /* This code assumes that extradata contains only palette */ /* This is true for all paletted codecs implemented in libavcodec */ if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) { #if HAVE_BIGENDIAN int i; for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE) / 4; i++) asf_st->palette[i] = av_bswap32(((uint32_t *)st->codec->extradata)[i]); #else memcpy(asf_st->palette, st->codec->extradata, FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)); #endif asf_st->palette_changed = 1; } st->codec->codec_tag = tag1; st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1); if (tag1 == MKTAG('D', 'V', 'R', ' ')) { st->need_parsing = AVSTREAM_PARSE_FULL; /* issue658 contains wrong w/h and MS even puts a fake seq header * with wrong w/h in extradata while a correct one is in the stream. * maximum lameness */ st->codec->width = st->codec->height = 0; av_freep(&st->codec->extradata); st->codec->extradata_size = 0; } if (st->codec->codec_id == AV_CODEC_ID_H264) st->need_parsing = AVSTREAM_PARSE_FULL_ONCE; } pos2 = avio_tell(pb); avio_skip(pb, size - (pos2 - pos1 + 24)); return 0; } static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size) { ASFContext *asf = s->priv_data; AVIOContext *pb = s->pb; ff_asf_guid g; int ext_len, payload_ext_ct, stream_ct, i; uint32_t leak_rate, stream_num; unsigned int stream_languageid_index; avio_rl64(pb); // starttime avio_rl64(pb); // endtime leak_rate = avio_rl32(pb); // leak-datarate avio_rl32(pb); // bucket-datasize avio_rl32(pb); // init-bucket-fullness avio_rl32(pb); // alt-leak-datarate avio_rl32(pb); // alt-bucket-datasize avio_rl32(pb); // alt-init-bucket-fullness avio_rl32(pb); // max-object-size avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved) stream_num = avio_rl16(pb); // stream-num stream_languageid_index = avio_rl16(pb); // stream-language-id-index if (stream_num < 128) asf->streams[stream_num].stream_language_index = stream_languageid_index; avio_rl64(pb); // avg frametime in 100ns units stream_ct = avio_rl16(pb); // stream-name-count payload_ext_ct = avio_rl16(pb); // payload-extension-system-count if (stream_num < 128) asf->stream_bitrates[stream_num] = leak_rate; for (i = 0; i < stream_ct; i++) { avio_rl16(pb); ext_len = avio_rl16(pb); avio_skip(pb, ext_len); } for (i = 0; i < payload_ext_ct; i++) { ff_get_guid(pb, &g); avio_skip(pb, 2); ext_len = avio_rl32(pb); avio_skip(pb, ext_len); } return 0; } static int asf_read_content_desc(AVFormatContext *s, int64_t size) { AVIOContext *pb = s->pb; int len1, len2, len3, len4, len5; len1 = avio_rl16(pb); len2 = avio_rl16(pb); len3 = avio_rl16(pb); len4 = avio_rl16(pb); len5 = avio_rl16(pb); get_tag(s, "title", 0, len1, 32); get_tag(s, "author", 0, len2, 32); get_tag(s, "copyright", 0, len3, 32); get_tag(s, "comment", 0, len4, 32); avio_skip(pb, len5); return 0; } static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size) { AVIOContext *pb = s->pb; ASFContext *asf = s->priv_data; int desc_count, i, ret; desc_count = avio_rl16(pb); for (i = 0; i < desc_count; i++) { int name_len, value_type, value_len; char name[1024]; name_len = avio_rl16(pb); if (name_len % 2) // must be even, broken lavf versions wrote len-1 name_len += 1; if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len) avio_skip(pb, name_len - ret); value_type = avio_rl16(pb); value_len = avio_rl16(pb); if (!value_type && value_len % 2) value_len += 1; /* My sample has that stream set to 0 maybe that mean the container. * ASF stream count starts at 1. I am using 0 to the container value * since it's unused. */ if (!strcmp(name, "AspectRatioX")) asf->dar[0].num = get_value(s->pb, value_type, 32); else if (!strcmp(name, "AspectRatioY")) asf->dar[0].den = get_value(s->pb, value_type, 32); else get_tag(s, name, value_type, value_len, 32); } return 0; } static int asf_read_language_list(AVFormatContext *s, int64_t size) { AVIOContext *pb = s->pb; ASFContext *asf = s->priv_data; int j, ret; int stream_count = avio_rl16(pb); for (j = 0; j < stream_count; j++) { char lang[6]; unsigned int lang_len = avio_r8(pb); if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len) avio_skip(pb, lang_len - ret); if (j < 128) av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages)); } return 0; } static int asf_read_metadata(AVFormatContext *s, int64_t size) { AVIOContext *pb = s->pb; ASFContext *asf = s->priv_data; int n, stream_num, name_len, value_len; int ret, i; n = avio_rl16(pb); for (i = 0; i < n; i++) { char name[1024]; int value_type; avio_rl16(pb); // lang_list_index stream_num = avio_rl16(pb); name_len = avio_rl16(pb); value_type = avio_rl16(pb); /* value_type */ value_len = avio_rl32(pb); if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len) avio_skip(pb, name_len - ret); av_dlog(s, "%d stream %d name_len %2d type %d len %4d <%s>\n", i, stream_num, name_len, value_type, value_len, name); if (!strcmp(name, "AspectRatioX")){ int aspect_x = get_value(s->pb, value_type, 16); if(stream_num < 128) asf->dar[stream_num].num = aspect_x; } else if(!strcmp(name, "AspectRatioY")){ int aspect_y = get_value(s->pb, value_type, 16); if(stream_num < 128) asf->dar[stream_num].den = aspect_y; } else { get_tag(s, name, value_type, value_len, 16); } } return 0; } static int asf_read_marker(AVFormatContext *s, int64_t size) { AVIOContext *pb = s->pb; ASFContext *asf = s->priv_data; int i, count, name_len, ret; char name[1024]; avio_rl64(pb); // reserved 16 bytes avio_rl64(pb); // ... count = avio_rl32(pb); // markers count avio_rl16(pb); // reserved 2 bytes name_len = avio_rl16(pb); // name length for (i = 0; i < name_len; i++) avio_r8(pb); // skip the name for (i = 0; i < count; i++) { int64_t pres_time; int name_len; avio_rl64(pb); // offset, 8 bytes pres_time = avio_rl64(pb); // presentation time pres_time -= asf->hdr.preroll * 10000; avio_rl16(pb); // entry length avio_rl32(pb); // send time avio_rl32(pb); // flags name_len = avio_rl32(pb); // name length if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len) avio_skip(pb, name_len - ret); avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time, AV_NOPTS_VALUE, name); } return 0; } static int asf_read_header(AVFormatContext *s) { ASFContext *asf = s->priv_data; ff_asf_guid g; AVIOContext *pb = s->pb; int i; int64_t gsize; ff_get_guid(pb, &g); if (ff_guidcmp(&g, &ff_asf_header)) return -1; avio_rl64(pb); avio_rl32(pb); avio_r8(pb); avio_r8(pb); memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid)); for (;;) { uint64_t gpos = avio_tell(pb); ff_get_guid(pb, &g); gsize = avio_rl64(pb); print_guid(&g); if (!ff_guidcmp(&g, &ff_asf_data_header)) { asf->data_object_offset = avio_tell(pb); /* If not streaming, gsize is not unlimited (how?), * and there is enough space in the file.. */ if (!(asf->hdr.flags & 0x01) && gsize >= 100) asf->data_object_size = gsize - 24; else asf->data_object_size = (uint64_t)-1; break; } if (gsize < 24) return -1; if (!ff_guidcmp(&g, &ff_asf_file_header)) { int ret = asf_read_file_properties(s, gsize); if (ret < 0) return ret; } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) { asf_read_stream_properties(s, gsize); } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) { asf_read_content_desc(s, gsize); } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) { asf_read_language_list(s, gsize); } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) { asf_read_ext_content_desc(s, gsize); } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) { asf_read_metadata(s, gsize); } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) { asf_read_metadata(s, gsize); } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) { asf_read_ext_stream_properties(s, gsize); // there could be a optional stream properties object to follow // if so the next iteration will pick it up continue; } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) { ff_get_guid(pb, &g); avio_skip(pb, 6); continue; } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) { asf_read_marker(s, gsize); } else if (pb->eof_reached) { return -1; } else { if (!s->keylen) { if (!ff_guidcmp(&g, &ff_asf_content_encryption)) { av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n"); } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) { av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n"); } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) { av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n"); } } } if (avio_tell(pb) != gpos + gsize) av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n", avio_tell(pb) - gpos, gsize); avio_seek(pb, gpos + gsize, SEEK_SET); } ff_get_guid(pb, &g); avio_rl64(pb); avio_r8(pb); avio_r8(pb); if (pb->eof_reached) return -1; asf->data_offset = avio_tell(pb); asf->packet_size_left = 0; for (i = 0; i < 128; i++) { int stream_num = asf->asfid2avid[i]; if (stream_num >= 0) { AVStream *st = s->streams[stream_num]; if (!st->codec->bit_rate) st->codec->bit_rate = asf->stream_bitrates[i]; if (asf->dar[i].num > 0 && asf->dar[i].den > 0) { av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den, asf->dar[i].num, asf->dar[i].den, INT_MAX); } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && // Use ASF container value if the stream doesn't set AR. (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)) av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den, asf->dar[0].num, asf->dar[0].den, INT_MAX); av_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den); // copy and convert language codes to the frontend if (asf->streams[i].stream_language_index < 128) { const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index]; if (rfc1766 && strlen(rfc1766) > 1) { const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL); if (iso6392) av_dict_set(&st->metadata, "language", iso6392, 0); } } } } ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv); return 0; } #define DO_2BITS(bits, var, defval) \ switch (bits & 3) { \ case 3: \ var = avio_rl32(pb); \ rsize += 4; \ break; \ case 2: \ var = avio_rl16(pb); \ rsize += 2; \ break; \ case 1: \ var = avio_r8(pb); \ rsize++; \ break; \ default: \ var = defval; \ break; \ } /** * Load a single ASF packet into the demuxer. * @param s demux context * @param pb context to read data from * @return 0 on success, <0 on error */ static int asf_get_packet(AVFormatContext *s, AVIOContext *pb) { ASFContext *asf = s->priv_data; uint32_t packet_length, padsize; int rsize = 8; int c, d, e, off; // if we do not know packet size, allow skipping up to 32 kB off = 32768; if (asf->no_resync_search) off = 3; else if (s->packet_size > 0) off = (avio_tell(pb) - s->data_offset) % s->packet_size + 3; c = d = e = -1; while (off-- > 0) { c = d; d = e; e = avio_r8(pb); if (c == 0x82 && !d && !e) break; } if (c != 0x82) { /* This code allows handling of -EAGAIN at packet boundaries (i.e. * if the packet sync code above triggers -EAGAIN). This does not * imply complete -EAGAIN handling support at random positions in * the stream. */ if (pb->error == AVERROR(EAGAIN)) return AVERROR(EAGAIN); if (!pb->eof_reached) av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb)); } if ((c & 0x8f) == 0x82) { if (d || e) { if (!pb->eof_reached) av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n"); return -1; } c = avio_r8(pb); d = avio_r8(pb); rsize += 3; } else if (!pb->eof_reached) { avio_seek(pb, -1, SEEK_CUR); // FIXME } asf->packet_flags = c; asf->packet_property = d; DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size); DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length // the following checks prevent overflows and infinite loops if (!packet_length || packet_length >= (1U << 29)) { av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb)); return -1; } if (padsize >= packet_length) { av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb)); return -1; } asf->packet_timestamp = avio_rl32(pb); avio_rl16(pb); /* duration */ // rsize has at least 11 bytes which have to be present if (asf->packet_flags & 0x01) { asf->packet_segsizetype = avio_r8(pb); rsize++; asf->packet_segments = asf->packet_segsizetype & 0x3f; } else { asf->packet_segments = 1; asf->packet_segsizetype = 0x80; } if (rsize > packet_length - padsize) { asf->packet_size_left = 0; av_log(s, AV_LOG_ERROR, "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n", rsize, packet_length, padsize, avio_tell(pb)); return -1; } asf->packet_size_left = packet_length - padsize - rsize; if (packet_length < asf->hdr.min_pktsize) padsize += asf->hdr.min_pktsize - packet_length; asf->packet_padsize = padsize; av_dlog(s, "packet: size=%d padsize=%d left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left); return 0; } /** * * @return <0 if error */ static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb) { ASFContext *asf = s->priv_data; int rsize = 1; int num = avio_r8(pb); int64_t ts0; asf->packet_segments--; asf->packet_key_frame = num >> 7; asf->stream_index = asf->asfid2avid[num & 0x7f]; // sequence should be ignored! DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0); DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0); DO_2BITS(asf->packet_property, asf->packet_replic_size, 0); av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, asf->packet_frag_offset, asf->packet_replic_size); if (asf->packet_replic_size >= 8) { asf->packet_obj_size = avio_rl32(pb); if (asf->packet_obj_size >= (1 << 24) || asf->packet_obj_size <= 0) { av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n"); return -1; } asf->packet_frag_timestamp = avio_rl32(pb); // timestamp if (asf->packet_replic_size >= 8 + 38 + 4) { avio_skip(pb, 10); ts0 = avio_rl64(pb); avio_skip(pb, 8); avio_skip(pb, 12); avio_rl32(pb); avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4); if (ts0 != -1) asf->packet_frag_timestamp = ts0 / 10000; else asf->packet_frag_timestamp = AV_NOPTS_VALUE; } else avio_skip(pb, asf->packet_replic_size - 8); rsize += asf->packet_replic_size; // FIXME - check validity } else if (asf->packet_replic_size == 1) { // multipacket - frag_offset is beginning timestamp asf->packet_time_start = asf->packet_frag_offset; asf->packet_frag_offset = 0; asf->packet_frag_timestamp = asf->packet_timestamp; asf->packet_time_delta = avio_r8(pb); rsize++; } else if (asf->packet_replic_size != 0) { av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size); return -1; } if (asf->packet_flags & 0x01) { DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal if (rsize > asf->packet_size_left) { av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n"); return -1; } else if (asf->packet_frag_size > asf->packet_size_left - rsize) { if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) { av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize); return -1; } else { int diff = asf->packet_frag_size - (asf->packet_size_left - rsize); asf->packet_size_left += diff; asf->packet_padsize -= diff; } } } else { if (rsize > asf->packet_size_left) { av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n"); return -1; } asf->packet_frag_size = asf->packet_size_left - rsize; } if (asf->packet_replic_size == 1) { asf->packet_multi_size = asf->packet_frag_size; if (asf->packet_multi_size > asf->packet_size_left) return -1; } asf->packet_size_left -= rsize; return 0; } /** * Parse data from individual ASF packets (which were previously loaded * with asf_get_packet()). * @param s demux context * @param pb context to read data from * @param pkt pointer to store packet data into * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF * packets need to be loaded (through asf_get_packet()) */ static int asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt) { ASFContext *asf = s->priv_data; ASFStream *asf_st = 0; for (;;) { int ret; if (pb->eof_reached) return AVERROR_EOF; if (asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1) { int ret = asf->packet_size_left + asf->packet_padsize; assert(ret >= 0); /* fail safe */ avio_skip(pb, ret); asf->packet_pos = avio_tell(pb); if (asf->data_object_size != (uint64_t)-1 && (asf->packet_pos - asf->data_object_offset >= asf->data_object_size)) return AVERROR_EOF; /* Do not exceed the size of the data object */ return 1; } if (asf->packet_time_start == 0) { if (asf_read_frame_header(s, pb) < 0) { asf->packet_segments = 0; continue; } if (asf->stream_index < 0 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)) { asf->packet_time_start = 0; /* unhandled packet (should not happen) */ avio_skip(pb, asf->packet_frag_size); asf->packet_size_left -= asf->packet_frag_size; if (asf->stream_index < 0) av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size); continue; } asf->asf_st = s->streams[asf->stream_index]->priv_data; } asf_st = asf->asf_st; av_assert0(asf_st); if (asf->packet_replic_size == 1) { // frag_offset is here used as the beginning timestamp asf->packet_frag_timestamp = asf->packet_time_start; asf->packet_time_start += asf->packet_time_delta; asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb); asf->packet_size_left--; asf->packet_multi_size--; if (asf->packet_multi_size < asf->packet_obj_size) { asf->packet_time_start = 0; avio_skip(pb, asf->packet_multi_size); asf->packet_size_left -= asf->packet_multi_size; continue; } asf->packet_multi_size -= asf->packet_obj_size; } if (asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size) { av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n", asf_st->frag_offset, asf->packet_frag_size, asf->packet_obj_size, asf_st->pkt.size); asf->packet_obj_size = asf_st->pkt.size; } if (asf_st->pkt.size != asf->packet_obj_size || // FIXME is this condition sufficient? asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { if (asf_st->pkt.data) { av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size); asf_st->frag_offset = 0; av_free_packet(&asf_st->pkt); } /* new packet */ av_new_packet(&asf_st->pkt, asf->packet_obj_size); asf_st->seq = asf->packet_seq; asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll; asf_st->pkt.stream_index = asf->stream_index; asf_st->pkt.pos = asf_st->packet_pos = asf->packet_pos; if (asf_st->pkt.data && asf_st->palette_changed) { uint8_t *pal; pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE); if (!pal) { av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n"); } else { memcpy(pal, asf_st->palette, AVPALETTE_SIZE); asf_st->palette_changed = 0; } } av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n", asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY, s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size); if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO) asf->packet_key_frame = 1; if (asf->packet_key_frame) asf_st->pkt.flags |= AV_PKT_FLAG_KEY; } /* read data */ av_dlog(asf, "READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n", s->packet_size, asf_st->pkt.size, asf->packet_frag_offset, asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data); asf->packet_size_left -= asf->packet_frag_size; if (asf->packet_size_left < 0) continue; if (asf->packet_frag_offset >= asf_st->pkt.size || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) { av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n", asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size); continue; } ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset, asf->packet_frag_size); if (ret != asf->packet_frag_size) { if (ret < 0 || asf->packet_frag_offset + ret == 0) return ret < 0 ? ret : AVERROR_EOF; if (asf_st->ds_span > 1) { // scrambling, we can either drop it completely or fill the remainder // TODO: should we fill the whole packet instead of just the current // fragment? memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0, asf->packet_frag_size - ret); ret = asf->packet_frag_size; } else { // no scrambling, so we can return partial packets av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret); } } if (s->key && s->keylen == 20) ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset, ret); asf_st->frag_offset += ret; /* test if whole packet is read */ if (asf_st->frag_offset == asf_st->pkt.size) { // workaround for macroshit radio DVR-MS files if (s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO && asf_st->pkt.size > 100) { int i; for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++) ; if (i == asf_st->pkt.size) { av_log(s, AV_LOG_DEBUG, "discarding ms fart\n"); asf_st->frag_offset = 0; av_free_packet(&asf_st->pkt); continue; } } /* return packet */ if (asf_st->ds_span > 1) { if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) { av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span); } else { /* packet descrambling */ AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE); if (buf) { uint8_t *newdata = buf->data; int offset = 0; memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE); while (offset < asf_st->pkt.size) { int off = offset / asf_st->ds_chunk_size; int row = off / asf_st->ds_span; int col = off % asf_st->ds_span; int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size; assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size); assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size); memcpy(newdata + offset, asf_st->pkt.data + idx * asf_st->ds_chunk_size, asf_st->ds_chunk_size); offset += asf_st->ds_chunk_size; } av_buffer_unref(&asf_st->pkt.buf); asf_st->pkt.buf = buf; asf_st->pkt.data = buf->data; } } } asf_st->frag_offset = 0; *pkt = asf_st->pkt; #if FF_API_DESTRUCT_PACKET FF_DISABLE_DEPRECATION_WARNINGS asf_st->pkt.destruct = NULL; FF_ENABLE_DEPRECATION_WARNINGS #endif asf_st->pkt.buf = 0; asf_st->pkt.size = 0; asf_st->pkt.data = 0; asf_st->pkt.side_data_elems = 0; asf_st->pkt.side_data = NULL; break; // packet completed } } return 0; } static int asf_read_packet(AVFormatContext *s, AVPacket *pkt) { ASFContext *asf = s->priv_data; for (;;) { int ret; /* parse cached packets, if any */ if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0) return ret; if ((ret = asf_get_packet(s, s->pb)) < 0) assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1); asf->packet_time_start = 0; } } // Added to support seeking after packets have been read // If information is not reset, read_packet fails due to // leftover information from previous reads static void asf_reset_header(AVFormatContext *s) { ASFContext *asf = s->priv_data; ASFStream *asf_st; int i; asf->packet_size_left = 0; asf->packet_segments = 0; asf->packet_flags = 0; asf->packet_property = 0; asf->packet_timestamp = 0; asf->packet_segsizetype = 0; asf->packet_segments = 0; asf->packet_seq = 0; asf->packet_replic_size = 0; asf->packet_key_frame = 0; asf->packet_padsize = 0; asf->packet_frag_offset = 0; asf->packet_frag_size = 0; asf->packet_frag_timestamp = 0; asf->packet_multi_size = 0; asf->packet_obj_size = 0; asf->packet_time_delta = 0; asf->packet_time_start = 0; for (i = 0; i < s->nb_streams; i++) { asf_st = s->streams[i]->priv_data; if (!asf_st) continue; av_free_packet(&asf_st->pkt); asf_st->frag_offset = 0; asf_st->seq = 0; } asf->asf_st = NULL; } static int asf_read_close(AVFormatContext *s) { asf_reset_header(s); return 0; } static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit) { AVPacket pkt1, *pkt = &pkt1; ASFStream *asf_st; int64_t pts; int64_t pos = *ppos; int i; int64_t start_pos[ASF_MAX_STREAMS]; for (i = 0; i < s->nb_streams; i++) start_pos[i] = pos; if (s->packet_size > 0) pos = (pos + s->packet_size - 1 - s->data_offset) / s->packet_size * s->packet_size + s->data_offset; *ppos = pos; avio_seek(s->pb, pos, SEEK_SET); asf_reset_header(s); for (;;) { if (asf_read_packet(s, pkt) < 0) { av_log(s, AV_LOG_INFO, "asf_read_pts failed\n"); return AV_NOPTS_VALUE; } pts = pkt->dts; av_free_packet(pkt); if (pkt->flags & AV_PKT_FLAG_KEY) { i = pkt->stream_index; asf_st = s->streams[i]->priv_data; av_assert0(asf_st); // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0); pos = asf_st->packet_pos; av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME); start_pos[i] = asf_st->packet_pos + 1; if (pkt->stream_index == stream_index) break; } } *ppos = pos; return pts; } static void asf_build_simple_index(AVFormatContext *s, int stream_index) { ff_asf_guid g; ASFContext *asf = s->priv_data; int64_t current_pos = avio_tell(s->pb); int i; avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET); ff_get_guid(s->pb, &g); /* the data object can be followed by other top-level objects, * skip them until the simple index object is reached */ while (ff_guidcmp(&g, &index_guid)) { int64_t gsize = avio_rl64(s->pb); if (gsize < 24 || s->pb->eof_reached) { avio_seek(s->pb, current_pos, SEEK_SET); return; } avio_skip(s->pb, gsize - 24); ff_get_guid(s->pb, &g); } { int64_t itime, last_pos = -1; int pct, ict; int64_t av_unused gsize = avio_rl64(s->pb); ff_get_guid(s->pb, &g); itime = avio_rl64(s->pb); pct = avio_rl32(s->pb); ict = avio_rl32(s->pb); av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict); for (i = 0; i < ict; i++) { int pktnum = avio_rl32(s->pb); int pktct = avio_rl16(s->pb); int64_t pos = s->data_offset + s->packet_size * (int64_t)pktnum; int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0); if (pos != last_pos) { av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n", pktnum, pktct, index_pts); av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME); last_pos = pos; } } asf->index_read = ict > 0; } avio_seek(s->pb, current_pos, SEEK_SET); } static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags) { ASFContext *asf = s->priv_data; AVStream *st = s->streams[stream_index]; int64_t pos; int index; if (s->packet_size <= 0) return -1; /* Try using the protocol's read_seek if available */ if (s->pb) { int ret = avio_seek_time(s->pb, stream_index, pts, flags); if (ret >= 0) asf_reset_header(s); if (ret != AVERROR(ENOSYS)) return ret; } if (!asf->index_read) asf_build_simple_index(s, stream_index); if ((asf->index_read && st->index_entries)) { index = av_index_search_timestamp(st, pts, flags); if (index >= 0) { /* find the position */ pos = st->index_entries[index].pos; /* do the seek */ av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos); avio_seek(s->pb, pos, SEEK_SET); asf_reset_header(s); return 0; } } /* no index or seeking by index failed */ if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0) return -1; asf_reset_header(s); return 0; } AVInputFormat ff_asf_demuxer = { .name = "asf", .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"), .priv_data_size = sizeof(ASFContext), .read_probe = asf_probe, .read_header = asf_read_header, .read_packet = asf_read_packet, .read_close = asf_read_close, .read_seek = asf_read_seek, .read_timestamp = asf_read_pts, .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH, .priv_class = &asf_class, };