/* * 4X Technologies .4xm File Demuxer (no muxer) * Copyright (c) 2003 The ffmpeg Project * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * 4X Technologies file demuxer * by Mike Melanson (melanson@pcisys.net) * for more information on the .4xm file format, visit: * http://www.pcisys.net/~melanson/codecs/ */ #include "libavutil/intreadwrite.h" #include "libavutil/intfloat.h" #include "avformat.h" #include "internal.h" #define RIFF_TAG MKTAG('R', 'I', 'F', 'F') #define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V') #define LIST_TAG MKTAG('L', 'I', 'S', 'T') #define HEAD_TAG MKTAG('H', 'E', 'A', 'D') #define TRK__TAG MKTAG('T', 'R', 'K', '_') #define MOVI_TAG MKTAG('M', 'O', 'V', 'I') #define VTRK_TAG MKTAG('V', 'T', 'R', 'K') #define STRK_TAG MKTAG('S', 'T', 'R', 'K') #define std__TAG MKTAG('s', 't', 'd', '_') #define name_TAG MKTAG('n', 'a', 'm', 'e') #define vtrk_TAG MKTAG('v', 't', 'r', 'k') #define strk_TAG MKTAG('s', 't', 'r', 'k') #define ifrm_TAG MKTAG('i', 'f', 'r', 'm') #define pfrm_TAG MKTAG('p', 'f', 'r', 'm') #define cfrm_TAG MKTAG('c', 'f', 'r', 'm') #define ifr2_TAG MKTAG('i', 'f', 'r', '2') #define pfr2_TAG MKTAG('p', 'f', 'r', '2') #define cfr2_TAG MKTAG('c', 'f', 'r', '2') #define snd__TAG MKTAG('s', 'n', 'd', '_') #define vtrk_SIZE 0x44 #define strk_SIZE 0x28 #define GET_LIST_HEADER() \ fourcc_tag = avio_rl32(pb); \ size = avio_rl32(pb); \ if (fourcc_tag != LIST_TAG) \ return AVERROR_INVALIDDATA; \ fourcc_tag = avio_rl32(pb); typedef struct AudioTrack { int sample_rate; int bits; int channels; int stream_index; int adpcm; int64_t audio_pts; } AudioTrack; typedef struct FourxmDemuxContext { int video_stream_index; int track_count; AudioTrack *tracks; int64_t video_pts; float fps; } FourxmDemuxContext; static int fourxm_probe(AVProbeData *p) { if ((AV_RL32(&p->buf[0]) != RIFF_TAG) || (AV_RL32(&p->buf[8]) != FOURXMV_TAG)) return 0; return AVPROBE_SCORE_MAX; } static int parse_vtrk(AVFormatContext *s, FourxmDemuxContext *fourxm, uint8_t *buf, int size) { AVStream *st; /* check that there is enough data */ if (size != vtrk_SIZE) { return AVERROR_INVALIDDATA; } /* allocate a new AVStream */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 60, 1, fourxm->fps); fourxm->video_stream_index = st->index; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = AV_CODEC_ID_4XM; st->codec->extradata_size = 4; st->codec->extradata = av_malloc(4); AV_WL32(st->codec->extradata, AV_RL32(buf + 16)); st->codec->width = AV_RL32(buf + 36); st->codec->height = AV_RL32(buf + 40); return 0; } static int parse_strk(AVFormatContext *s, FourxmDemuxContext *fourxm, uint8_t *buf, int size) { AVStream *st; int track; /* check that there is enough data */ if (size != strk_SIZE) return AVERROR_INVALIDDATA; track = AV_RL32(buf + 8); if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1) { av_log(s, AV_LOG_ERROR, "current_track too large\n"); return AVERROR_INVALIDDATA; } if (track + 1 > fourxm->track_count) { if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack))) return AVERROR(ENOMEM); memset(&fourxm->tracks[fourxm->track_count], 0, sizeof(AudioTrack) * (track + 1 - fourxm->track_count)); fourxm->track_count = track + 1; } fourxm->tracks[track].adpcm = AV_RL32(buf + 12); fourxm->tracks[track].channels = AV_RL32(buf + 36); fourxm->tracks[track].sample_rate = AV_RL32(buf + 40); fourxm->tracks[track].bits = AV_RL32(buf + 44); fourxm->tracks[track].audio_pts = 0; if (fourxm->tracks[track].channels <= 0 || fourxm->tracks[track].sample_rate <= 0 || fourxm->tracks[track].bits < 0) { av_log(s, AV_LOG_ERROR, "audio header invalid\n"); return AVERROR_INVALIDDATA; } if (!fourxm->tracks[track].adpcm && fourxm->tracks[track].bits<8) { av_log(s, AV_LOG_ERROR, "bits unspecified for non ADPCM\n"); return AVERROR_INVALIDDATA; } /* allocate a new AVStream */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->id = track; avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate); fourxm->tracks[track].stream_index = st->index; st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_tag = 0; st->codec->channels = fourxm->tracks[track].channels; st->codec->sample_rate = fourxm->tracks[track].sample_rate; st->codec->bits_per_coded_sample = fourxm->tracks[track].bits; st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample; st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; if (fourxm->tracks[track].adpcm){ st->codec->codec_id = AV_CODEC_ID_ADPCM_4XM; } else if (st->codec->bits_per_coded_sample == 8) { st->codec->codec_id = AV_CODEC_ID_PCM_U8; } else st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; return 0; } static int fourxm_read_header(AVFormatContext *s) { AVIOContext *pb = s->pb; unsigned int fourcc_tag; unsigned int size; int header_size; FourxmDemuxContext *fourxm = s->priv_data; unsigned char *header; int i, ret; fourxm->track_count = 0; fourxm->tracks = NULL; fourxm->fps = 1.0; /* skip the first 3 32-bit numbers */ avio_skip(pb, 12); /* check for LIST-HEAD */ GET_LIST_HEADER(); header_size = size - 4; if (fourcc_tag != HEAD_TAG || header_size < 0) return AVERROR_INVALIDDATA; /* allocate space for the header and load the whole thing */ header = av_malloc(header_size); if (!header) return AVERROR(ENOMEM); if (avio_read(pb, header, header_size) != header_size) { av_free(header); return AVERROR(EIO); } /* take the lazy approach and search for any and all vtrk and strk chunks */ for (i = 0; i < header_size - 8; i++) { fourcc_tag = AV_RL32(&header[i]); size = AV_RL32(&header[i + 4]); if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) { av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8); return AVERROR_INVALIDDATA; } if (fourcc_tag == std__TAG) { if (header_size < i + 16) { av_log(s, AV_LOG_ERROR, "std TAG truncated\n"); return AVERROR_INVALIDDATA; } fourxm->fps = av_int2float(AV_RL32(&header[i + 12])); } else if (fourcc_tag == vtrk_TAG) { if ((ret = parse_vtrk(s, fourxm, header + i, size)) < 0) goto fail; i += 8 + size; } else if (fourcc_tag == strk_TAG) { if ((ret = parse_strk(s, fourxm, header + i, size)) < 0) goto fail; i += 8 + size; } } /* skip over the LIST-MOVI chunk (which is where the stream should be */ GET_LIST_HEADER(); if (fourcc_tag != MOVI_TAG) { ret = AVERROR_INVALIDDATA; goto fail; } av_free(header); /* initialize context members */ fourxm->video_pts = -1; /* first frame will push to 0 */ return 0; fail: av_freep(&fourxm->tracks); av_free(header); return ret; } static int fourxm_read_packet(AVFormatContext *s, AVPacket *pkt) { FourxmDemuxContext *fourxm = s->priv_data; AVIOContext *pb = s->pb; unsigned int fourcc_tag; unsigned int size; int ret = 0; unsigned int track_number; int packet_read = 0; unsigned char header[8]; int audio_frame_count; while (!packet_read) { if ((ret = avio_read(s->pb, header, 8)) < 0) return ret; fourcc_tag = AV_RL32(&header[0]); size = AV_RL32(&header[4]); if (url_feof(pb)) return AVERROR(EIO); switch (fourcc_tag) { case LIST_TAG: /* this is a good time to bump the video pts */ fourxm->video_pts++; /* skip the LIST-* tag and move on to the next fourcc */ avio_rl32(pb); break; case ifrm_TAG: case pfrm_TAG: case cfrm_TAG: case ifr2_TAG: case pfr2_TAG: case cfr2_TAG: /* allocate 8 more bytes than 'size' to account for fourcc * and size */ if (size + 8 < size || av_new_packet(pkt, size + 8)) return AVERROR(EIO); pkt->stream_index = fourxm->video_stream_index; pkt->pts = fourxm->video_pts; pkt->pos = avio_tell(s->pb); memcpy(pkt->data, header, 8); ret = avio_read(s->pb, &pkt->data[8], size); if (ret < 0) { av_free_packet(pkt); } else packet_read = 1; break; case snd__TAG: track_number = avio_rl32(pb); avio_skip(pb, 4); size -= 8; if (track_number < fourxm->track_count && fourxm->tracks[track_number].channels > 0) { ret = av_get_packet(s->pb, pkt, size); if (ret < 0) return AVERROR(EIO); pkt->stream_index = fourxm->tracks[track_number].stream_index; pkt->pts = fourxm->tracks[track_number].audio_pts; packet_read = 1; /* pts accounting */ audio_frame_count = size; if (fourxm->tracks[track_number].adpcm) audio_frame_count -= 2 * (fourxm->tracks[track_number].channels); audio_frame_count /= fourxm->tracks[track_number].channels; if (fourxm->tracks[track_number].adpcm) { audio_frame_count *= 2; } else audio_frame_count /= (fourxm->tracks[track_number].bits / 8); fourxm->tracks[track_number].audio_pts += audio_frame_count; } else { avio_skip(pb, size); } break; default: avio_skip(pb, size); break; } } return ret; } static int fourxm_read_close(AVFormatContext *s) { FourxmDemuxContext *fourxm = s->priv_data; av_freep(&fourxm->tracks); return 0; } AVInputFormat ff_fourxm_demuxer = { .name = "4xm", .long_name = NULL_IF_CONFIG_SMALL("4X Technologies"), .priv_data_size = sizeof(FourxmDemuxContext), .read_probe = fourxm_probe, .read_header = fourxm_read_header, .read_packet = fourxm_read_packet, .read_close = fourxm_read_close, };