368 lines
11 KiB
C
368 lines
11 KiB
C
/*
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* 4X Technologies .4xm File Demuxer (no muxer)
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* Copyright (c) 2003 The ffmpeg Project
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* 4X Technologies file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* for more information on the .4xm file format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat.h"
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#include "avformat.h"
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#include "internal.h"
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#define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
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#define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
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#define LIST_TAG MKTAG('L', 'I', 'S', 'T')
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#define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
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#define TRK__TAG MKTAG('T', 'R', 'K', '_')
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#define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
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#define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
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#define STRK_TAG MKTAG('S', 'T', 'R', 'K')
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#define std__TAG MKTAG('s', 't', 'd', '_')
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#define name_TAG MKTAG('n', 'a', 'm', 'e')
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#define vtrk_TAG MKTAG('v', 't', 'r', 'k')
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#define strk_TAG MKTAG('s', 't', 'r', 'k')
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#define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
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#define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
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#define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
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#define ifr2_TAG MKTAG('i', 'f', 'r', '2')
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#define pfr2_TAG MKTAG('p', 'f', 'r', '2')
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#define cfr2_TAG MKTAG('c', 'f', 'r', '2')
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#define snd__TAG MKTAG('s', 'n', 'd', '_')
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#define vtrk_SIZE 0x44
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#define strk_SIZE 0x28
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#define GET_LIST_HEADER() \
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fourcc_tag = avio_rl32(pb); \
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size = avio_rl32(pb); \
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if (fourcc_tag != LIST_TAG) \
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return AVERROR_INVALIDDATA; \
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fourcc_tag = avio_rl32(pb);
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typedef struct AudioTrack {
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int sample_rate;
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int bits;
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int channels;
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int stream_index;
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int adpcm;
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int64_t audio_pts;
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} AudioTrack;
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typedef struct FourxmDemuxContext {
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int video_stream_index;
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int track_count;
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AudioTrack *tracks;
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int64_t video_pts;
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float fps;
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} FourxmDemuxContext;
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static int fourxm_probe(AVProbeData *p)
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{
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if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
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(AV_RL32(&p->buf[8]) != FOURXMV_TAG))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int parse_vtrk(AVFormatContext *s,
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FourxmDemuxContext *fourxm, uint8_t *buf, int size,
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int left)
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{
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AVStream *st;
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/* check that there is enough data */
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if (size != vtrk_SIZE || left < size + 8) {
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return AVERROR_INVALIDDATA;
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}
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/* allocate a new AVStream */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 60, 1, fourxm->fps);
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fourxm->video_stream_index = st->index;
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = AV_CODEC_ID_4XM;
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st->codec->extradata_size = 4;
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st->codec->extradata = av_malloc(4);
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AV_WL32(st->codec->extradata, AV_RL32(buf + 16));
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st->codec->width = AV_RL32(buf + 36);
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st->codec->height = AV_RL32(buf + 40);
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return 0;
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}
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static int parse_strk(AVFormatContext *s,
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FourxmDemuxContext *fourxm, uint8_t *buf, int size,
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int left)
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{
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AVStream *st;
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int track;
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/* check that there is enough data */
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if (size != strk_SIZE || left < size + 8)
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return AVERROR_INVALIDDATA;
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track = AV_RL32(buf + 8);
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if (track + 1 > fourxm->track_count) {
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if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
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return AVERROR(ENOMEM);
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memset(&fourxm->tracks[fourxm->track_count], 0,
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sizeof(AudioTrack) * (track + 1 - fourxm->track_count));
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fourxm->track_count = track + 1;
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}
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fourxm->tracks[track].adpcm = AV_RL32(buf + 12);
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fourxm->tracks[track].channels = AV_RL32(buf + 36);
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fourxm->tracks[track].sample_rate = AV_RL32(buf + 40);
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fourxm->tracks[track].bits = AV_RL32(buf + 44);
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fourxm->tracks[track].audio_pts = 0;
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if (fourxm->tracks[track].channels <= 0 ||
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fourxm->tracks[track].sample_rate <= 0 ||
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fourxm->tracks[track].bits < 0) {
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av_log(s, AV_LOG_ERROR, "audio header invalid\n");
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return AVERROR_INVALIDDATA;
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}
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/* allocate a new AVStream */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->id = track;
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avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate);
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fourxm->tracks[track].stream_index = st->index;
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_tag = 0;
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st->codec->channels = fourxm->tracks[track].channels;
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st->codec->sample_rate = fourxm->tracks[track].sample_rate;
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st->codec->bits_per_coded_sample = fourxm->tracks[track].bits;
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st->codec->bit_rate = st->codec->channels *
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st->codec->sample_rate *
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st->codec->bits_per_coded_sample;
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st->codec->block_align = st->codec->channels *
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st->codec->bits_per_coded_sample;
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if (fourxm->tracks[track].adpcm){
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st->codec->codec_id = AV_CODEC_ID_ADPCM_4XM;
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} else if (st->codec->bits_per_coded_sample == 8) {
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st->codec->codec_id = AV_CODEC_ID_PCM_U8;
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} else
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st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
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return 0;
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}
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static int fourxm_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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unsigned int fourcc_tag;
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unsigned int size;
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int header_size;
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FourxmDemuxContext *fourxm = s->priv_data;
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unsigned char *header;
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int i, ret;
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fourxm->track_count = 0;
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fourxm->tracks = NULL;
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fourxm->fps = 1.0;
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/* skip the first 3 32-bit numbers */
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avio_skip(pb, 12);
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/* check for LIST-HEAD */
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GET_LIST_HEADER();
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header_size = size - 4;
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if (fourcc_tag != HEAD_TAG || header_size < 0)
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return AVERROR_INVALIDDATA;
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/* allocate space for the header and load the whole thing */
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header = av_malloc(header_size);
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if (!header)
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return AVERROR(ENOMEM);
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if (avio_read(pb, header, header_size) != header_size) {
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av_free(header);
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return AVERROR(EIO);
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}
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/* take the lazy approach and search for any and all vtrk and strk chunks */
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for (i = 0; i < header_size - 8; i++) {
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fourcc_tag = AV_RL32(&header[i]);
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size = AV_RL32(&header[i + 4]);
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if (fourcc_tag == std__TAG) {
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if (header_size - i < 16) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
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} else if (fourcc_tag == vtrk_TAG) {
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if ((ret = parse_vtrk(s, fourxm, header + i, size,
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header_size - i)) < 0)
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goto fail;
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i += 8 + size;
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} else if (fourcc_tag == strk_TAG) {
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if ((ret = parse_strk(s, fourxm, header + i, size,
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header_size - i)) < 0)
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goto fail;
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i += 8 + size;
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}
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}
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/* skip over the LIST-MOVI chunk (which is where the stream should be */
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GET_LIST_HEADER();
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if (fourcc_tag != MOVI_TAG) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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av_free(header);
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/* initialize context members */
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fourxm->video_pts = -1; /* first frame will push to 0 */
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return 0;
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fail:
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av_freep(&fourxm->tracks);
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av_free(header);
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return ret;
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}
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static int fourxm_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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FourxmDemuxContext *fourxm = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned int fourcc_tag;
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unsigned int size;
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int ret = 0;
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unsigned int track_number;
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int packet_read = 0;
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unsigned char header[8];
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int audio_frame_count;
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while (!packet_read) {
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if ((ret = avio_read(s->pb, header, 8)) < 0)
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return ret;
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fourcc_tag = AV_RL32(&header[0]);
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size = AV_RL32(&header[4]);
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if (pb->eof_reached)
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return AVERROR(EIO);
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switch (fourcc_tag) {
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case LIST_TAG:
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/* this is a good time to bump the video pts */
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fourxm->video_pts++;
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/* skip the LIST-* tag and move on to the next fourcc */
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avio_rl32(pb);
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break;
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case ifrm_TAG:
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case pfrm_TAG:
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case cfrm_TAG:
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case ifr2_TAG:
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case pfr2_TAG:
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case cfr2_TAG:
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/* allocate 8 more bytes than 'size' to account for fourcc
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* and size */
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if (size + 8 < size || av_new_packet(pkt, size + 8))
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return AVERROR(EIO);
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pkt->stream_index = fourxm->video_stream_index;
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pkt->pts = fourxm->video_pts;
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pkt->pos = avio_tell(s->pb);
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memcpy(pkt->data, header, 8);
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ret = avio_read(s->pb, &pkt->data[8], size);
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if (ret < 0) {
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av_free_packet(pkt);
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} else
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packet_read = 1;
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break;
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case snd__TAG:
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track_number = avio_rl32(pb);
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avio_skip(pb, 4);
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size -= 8;
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if (track_number < fourxm->track_count &&
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fourxm->tracks[track_number].channels > 0) {
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ret = av_get_packet(s->pb, pkt, size);
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if (ret < 0)
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return AVERROR(EIO);
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pkt->stream_index =
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fourxm->tracks[track_number].stream_index;
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pkt->pts = fourxm->tracks[track_number].audio_pts;
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packet_read = 1;
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/* pts accounting */
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audio_frame_count = size;
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if (fourxm->tracks[track_number].adpcm)
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audio_frame_count -= 2 * (fourxm->tracks[track_number].channels);
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audio_frame_count /= fourxm->tracks[track_number].channels;
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if (fourxm->tracks[track_number].adpcm) {
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audio_frame_count *= 2;
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} else
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audio_frame_count /=
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(fourxm->tracks[track_number].bits / 8);
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fourxm->tracks[track_number].audio_pts += audio_frame_count;
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} else {
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avio_skip(pb, size);
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}
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break;
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default:
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avio_skip(pb, size);
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break;
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}
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}
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return ret;
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}
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static int fourxm_read_close(AVFormatContext *s)
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{
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FourxmDemuxContext *fourxm = s->priv_data;
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av_freep(&fourxm->tracks);
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return 0;
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}
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AVInputFormat ff_fourxm_demuxer = {
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.name = "4xm",
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.long_name = NULL_IF_CONFIG_SMALL("4X Technologies"),
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.priv_data_size = sizeof(FourxmDemuxContext),
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.read_probe = fourxm_probe,
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.read_header = fourxm_read_header,
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.read_packet = fourxm_read_packet,
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.read_close = fourxm_read_close,
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};
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