mirror of https://git.ffmpeg.org/ffmpeg.git
226 lines
7.3 KiB
C
226 lines
7.3 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#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 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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int framerate;
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AVStream *st;
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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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framerate = 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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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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av_set_pts_info(st, 63, 1, framerate);
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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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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 (url_feof(s->pb))
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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->width || !roq->height) {
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AVStream *st = s->streams[roq->video_stream_index];
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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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av_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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