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https://github.com/FFmpeg/FFmpeg.git
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3f9257c5a5
This fixes demuxing of file where the first packet is not audio. Such files are generated by our idroq muxer. It also fixes demuxing of audio only idroq files.
228 lines
7.4 KiB
C
228 lines
7.4 KiB
C
/*
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* id RoQ (.roq) File Demuxer
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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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* id RoQ format file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* for more information on the .roq file format, visit:
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* http://www.csse.monash.edu.au/~timf/
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*/
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#define RoQ_MAGIC_NUMBER 0x1084
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#define RoQ_CHUNK_PREAMBLE_SIZE 8
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#define RoQ_AUDIO_SAMPLE_RATE 22050
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#define RoQ_CHUNKS_TO_SCAN 30
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#define RoQ_INFO 0x1001
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#define RoQ_QUAD_CODEBOOK 0x1002
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#define RoQ_QUAD_VQ 0x1011
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#define RoQ_SOUND_MONO 0x1020
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#define RoQ_SOUND_STEREO 0x1021
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typedef struct RoqDemuxContext {
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int frame_rate;
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int width;
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int height;
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int audio_channels;
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int video_stream_index;
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int audio_stream_index;
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int64_t video_pts;
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unsigned int audio_frame_count;
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} RoqDemuxContext;
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static int roq_probe(AVProbeData *p)
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{
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if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
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(AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int roq_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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RoqDemuxContext *roq = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
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/* get the main header */
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if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
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RoQ_CHUNK_PREAMBLE_SIZE)
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return AVERROR(EIO);
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roq->frame_rate = AV_RL16(&preamble[6]);
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/* init private context parameters */
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roq->width = roq->height = roq->audio_channels = roq->video_pts =
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roq->audio_frame_count = 0;
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roq->audio_stream_index = -1;
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roq->video_stream_index = -1;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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return 0;
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}
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static int roq_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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RoqDemuxContext *roq = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret = 0;
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unsigned int chunk_size;
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unsigned int chunk_type;
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unsigned int codebook_size;
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unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
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int packet_read = 0;
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int64_t codebook_offset;
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while (!packet_read) {
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if (s->pb->eof_reached)
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return AVERROR(EIO);
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/* get the next chunk preamble */
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if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
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RoQ_CHUNK_PREAMBLE_SIZE)
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return AVERROR(EIO);
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chunk_type = AV_RL16(&preamble[0]);
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chunk_size = AV_RL32(&preamble[2]);
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if(chunk_size > INT_MAX)
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return AVERROR_INVALIDDATA;
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switch (chunk_type) {
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case RoQ_INFO:
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if (roq->video_stream_index == -1) {
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AVStream *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, 63, 1, roq->frame_rate);
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roq->video_stream_index = st->index;
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = CODEC_ID_ROQ;
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st->codec->codec_tag = 0; /* no fourcc */
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if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
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return AVERROR(EIO);
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st->codec->width = roq->width = AV_RL16(preamble);
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st->codec->height = roq->height = AV_RL16(preamble + 2);
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break;
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}
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/* don't care about this chunk anymore */
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avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
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break;
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case RoQ_QUAD_CODEBOOK:
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/* packet needs to contain both this codebook and next VQ chunk */
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codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
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codebook_size = chunk_size;
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avio_skip(pb, codebook_size);
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if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
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RoQ_CHUNK_PREAMBLE_SIZE)
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return AVERROR(EIO);
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chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
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codebook_size;
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/* rewind */
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avio_seek(pb, codebook_offset, SEEK_SET);
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/* load up the packet */
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ret= av_get_packet(pb, pkt, chunk_size);
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if (ret != chunk_size)
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return AVERROR(EIO);
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pkt->stream_index = roq->video_stream_index;
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pkt->pts = roq->video_pts++;
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packet_read = 1;
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break;
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case RoQ_SOUND_MONO:
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case RoQ_SOUND_STEREO:
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if (roq->audio_stream_index == -1) {
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AVStream *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, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
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roq->audio_stream_index = st->index;
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_ROQ_DPCM;
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st->codec->codec_tag = 0; /* no tag */
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st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
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st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
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st->codec->bits_per_coded_sample = 16;
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st->codec->bit_rate = st->codec->channels * 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 * st->codec->bits_per_coded_sample;
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}
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case RoQ_QUAD_VQ:
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/* load up the packet */
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if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
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return AVERROR(EIO);
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/* copy over preamble */
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memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
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if (chunk_type == RoQ_QUAD_VQ) {
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pkt->stream_index = roq->video_stream_index;
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pkt->pts = roq->video_pts++;
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} else {
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pkt->stream_index = roq->audio_stream_index;
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pkt->pts = roq->audio_frame_count;
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roq->audio_frame_count += (chunk_size / roq->audio_channels);
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}
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pkt->pos= avio_tell(pb);
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ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
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chunk_size);
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if (ret != chunk_size)
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ret = AVERROR(EIO);
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packet_read = 1;
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break;
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default:
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av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
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return AVERROR_INVALIDDATA;
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}
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}
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return ret;
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}
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AVInputFormat ff_roq_demuxer = {
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.name = "RoQ",
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.long_name = NULL_IF_CONFIG_SMALL("id RoQ format"),
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.priv_data_size = sizeof(RoqDemuxContext),
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.read_probe = roq_probe,
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.read_header = roq_read_header,
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.read_packet = roq_read_packet,
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};
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