mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-25 04:30:02 +00:00
281 lines
8.5 KiB
C
281 lines
8.5 KiB
C
/*
|
|
* id RoQ (.roq) File Demuxer
|
|
* 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 idroq.c
|
|
* id RoQ format file demuxer
|
|
* by Mike Melanson (melanson@pcisys.net)
|
|
* for more information on the .roq file format, visit:
|
|
* http://www.csse.monash.edu.au/~timf/
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
|
|
#define RoQ_MAGIC_NUMBER 0x1084
|
|
#define RoQ_CHUNK_PREAMBLE_SIZE 8
|
|
#define RoQ_AUDIO_SAMPLE_RATE 22050
|
|
#define RoQ_CHUNKS_TO_SCAN 30
|
|
|
|
#define RoQ_INFO 0x1001
|
|
#define RoQ_QUAD_CODEBOOK 0x1002
|
|
#define RoQ_QUAD_VQ 0x1011
|
|
#define RoQ_SOUND_MONO 0x1020
|
|
#define RoQ_SOUND_STEREO 0x1021
|
|
|
|
typedef struct RoqDemuxContext {
|
|
|
|
int width;
|
|
int height;
|
|
int audio_channels;
|
|
int framerate;
|
|
int frame_pts_inc;
|
|
|
|
int video_stream_index;
|
|
int audio_stream_index;
|
|
|
|
int64_t video_pts;
|
|
unsigned int audio_frame_count;
|
|
|
|
} RoqDemuxContext;
|
|
|
|
static int roq_probe(AVProbeData *p)
|
|
{
|
|
if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
|
|
(AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int roq_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
RoqDemuxContext *roq = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
|
|
int i;
|
|
unsigned int chunk_size;
|
|
unsigned int chunk_type;
|
|
|
|
/* get the main header */
|
|
if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
|
|
RoQ_CHUNK_PREAMBLE_SIZE)
|
|
return AVERROR(EIO);
|
|
roq->framerate = AV_RL16(&preamble[6]);
|
|
roq->frame_pts_inc = 90000 / roq->framerate;
|
|
|
|
/* init private context parameters */
|
|
roq->width = roq->height = roq->audio_channels = roq->video_pts =
|
|
roq->audio_frame_count = 0;
|
|
|
|
/* scan the first n chunks searching for A/V parameters */
|
|
for (i = 0; i < RoQ_CHUNKS_TO_SCAN; i++) {
|
|
if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
|
|
RoQ_CHUNK_PREAMBLE_SIZE)
|
|
return AVERROR(EIO);
|
|
|
|
chunk_type = AV_RL16(&preamble[0]);
|
|
chunk_size = AV_RL32(&preamble[2]);
|
|
|
|
switch (chunk_type) {
|
|
|
|
case RoQ_INFO:
|
|
/* fetch the width and height; reuse the preamble bytes */
|
|
if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
|
|
RoQ_CHUNK_PREAMBLE_SIZE)
|
|
return AVERROR(EIO);
|
|
roq->width = AV_RL16(&preamble[0]);
|
|
roq->height = AV_RL16(&preamble[2]);
|
|
break;
|
|
|
|
case RoQ_QUAD_CODEBOOK:
|
|
case RoQ_QUAD_VQ:
|
|
/* ignore during this scan */
|
|
url_fseek(pb, chunk_size, SEEK_CUR);
|
|
break;
|
|
|
|
case RoQ_SOUND_MONO:
|
|
roq->audio_channels = 1;
|
|
url_fseek(pb, chunk_size, SEEK_CUR);
|
|
break;
|
|
|
|
case RoQ_SOUND_STEREO:
|
|
roq->audio_channels = 2;
|
|
url_fseek(pb, chunk_size, SEEK_CUR);
|
|
break;
|
|
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, " unknown RoQ chunk type (%04X)\n", AV_RL16(&preamble[0]));
|
|
return AVERROR_INVALIDDATA;
|
|
break;
|
|
}
|
|
|
|
/* if all necessary parameters have been gathered, exit early */
|
|
if ((roq->width && roq->height) && roq->audio_channels)
|
|
break;
|
|
}
|
|
|
|
/* seek back to the first chunk */
|
|
url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_SET);
|
|
|
|
/* initialize the decoders */
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
/* set the pts reference (1 pts = 1/90000) */
|
|
av_set_pts_info(st, 33, 1, 90000);
|
|
roq->video_stream_index = st->index;
|
|
st->codec->codec_type = CODEC_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_ROQ;
|
|
st->codec->codec_tag = 0; /* no fourcc */
|
|
st->codec->width = roq->width;
|
|
st->codec->height = roq->height;
|
|
|
|
if (roq->audio_channels) {
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
av_set_pts_info(st, 33, 1, 90000);
|
|
roq->audio_stream_index = st->index;
|
|
st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec->codec_id = CODEC_ID_ROQ_DPCM;
|
|
st->codec->codec_tag = 0; /* no tag */
|
|
st->codec->channels = roq->audio_channels;
|
|
st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
|
|
st->codec->bits_per_sample = 16;
|
|
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
|
|
st->codec->bits_per_sample;
|
|
st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int roq_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
RoqDemuxContext *roq = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
int ret = 0;
|
|
unsigned int chunk_size;
|
|
unsigned int chunk_type;
|
|
unsigned int codebook_size;
|
|
unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
|
|
int packet_read = 0;
|
|
offset_t codebook_offset;
|
|
|
|
while (!packet_read) {
|
|
|
|
if (url_feof(s->pb))
|
|
return AVERROR(EIO);
|
|
|
|
/* get the next chunk preamble */
|
|
if ((ret = get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
|
|
RoQ_CHUNK_PREAMBLE_SIZE)
|
|
return AVERROR(EIO);
|
|
|
|
chunk_type = AV_RL16(&preamble[0]);
|
|
chunk_size = AV_RL32(&preamble[2]);
|
|
if(chunk_size > INT_MAX)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
switch (chunk_type) {
|
|
|
|
case RoQ_INFO:
|
|
/* don't care about this chunk anymore */
|
|
url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR);
|
|
break;
|
|
|
|
case RoQ_QUAD_CODEBOOK:
|
|
/* packet needs to contain both this codebook and next VQ chunk */
|
|
codebook_offset = url_ftell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
|
|
codebook_size = chunk_size;
|
|
url_fseek(pb, codebook_size, SEEK_CUR);
|
|
if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
|
|
RoQ_CHUNK_PREAMBLE_SIZE)
|
|
return AVERROR(EIO);
|
|
chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
|
|
codebook_size;
|
|
|
|
/* rewind */
|
|
url_fseek(pb, codebook_offset, SEEK_SET);
|
|
|
|
/* load up the packet */
|
|
ret= av_get_packet(pb, pkt, chunk_size);
|
|
if (ret != chunk_size)
|
|
return AVERROR(EIO);
|
|
pkt->stream_index = roq->video_stream_index;
|
|
pkt->pts = roq->video_pts;
|
|
|
|
roq->video_pts += roq->frame_pts_inc;
|
|
packet_read = 1;
|
|
break;
|
|
|
|
case RoQ_SOUND_MONO:
|
|
case RoQ_SOUND_STEREO:
|
|
case RoQ_QUAD_VQ:
|
|
/* load up the packet */
|
|
if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
|
|
return AVERROR(EIO);
|
|
/* copy over preamble */
|
|
memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
|
|
|
|
if (chunk_type == RoQ_QUAD_VQ) {
|
|
pkt->stream_index = roq->video_stream_index;
|
|
pkt->pts = roq->video_pts;
|
|
roq->video_pts += roq->frame_pts_inc;
|
|
} else {
|
|
pkt->stream_index = roq->audio_stream_index;
|
|
pkt->pts = roq->audio_frame_count;
|
|
pkt->pts *= 90000;
|
|
pkt->pts /= RoQ_AUDIO_SAMPLE_RATE;
|
|
roq->audio_frame_count += (chunk_size / roq->audio_channels);
|
|
}
|
|
|
|
pkt->pos= url_ftell(pb);
|
|
ret = get_buffer(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
|
|
chunk_size);
|
|
if (ret != chunk_size)
|
|
ret = AVERROR(EIO);
|
|
|
|
packet_read = 1;
|
|
break;
|
|
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
|
|
return AVERROR_INVALIDDATA;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat roq_demuxer = {
|
|
"RoQ",
|
|
NULL_IF_CONFIG_SMALL("id RoQ format"),
|
|
sizeof(RoqDemuxContext),
|
|
roq_probe,
|
|
roq_read_header,
|
|
roq_read_packet,
|
|
};
|