mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
244 lines
8.1 KiB
244 lines
8.1 KiB
/* |
|
* 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 |
|
* 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 "libavutil/channel_layout.h" |
|
#include "libavutil/intreadwrite.h" |
|
#include "avformat.h" |
|
#include "internal.h" |
|
#include "avio_internal.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 frame_rate; |
|
int width; |
|
int height; |
|
int audio_channels; |
|
|
|
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) |
|
{ |
|
RoqDemuxContext *roq = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE]; |
|
|
|
/* get the main header */ |
|
if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != |
|
RoQ_CHUNK_PREAMBLE_SIZE) |
|
return AVERROR(EIO); |
|
roq->frame_rate = AV_RL16(&preamble[6]); |
|
|
|
/* init private context parameters */ |
|
roq->width = roq->height = roq->audio_channels = roq->video_pts = |
|
roq->audio_frame_count = 0; |
|
roq->audio_stream_index = -1; |
|
roq->video_stream_index = -1; |
|
|
|
s->ctx_flags |= AVFMTCTX_NOHEADER; |
|
|
|
return 0; |
|
} |
|
|
|
static int roq_read_packet(AVFormatContext *s, |
|
AVPacket *pkt) |
|
{ |
|
RoqDemuxContext *roq = s->priv_data; |
|
AVIOContext *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; |
|
int64_t codebook_offset; |
|
|
|
while (!packet_read) { |
|
|
|
if (avio_feof(s->pb)) |
|
return AVERROR(EIO); |
|
|
|
/* get the next chunk preamble */ |
|
if ((ret = avio_read(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; |
|
|
|
chunk_size = ffio_limit(pb, chunk_size); |
|
|
|
switch (chunk_type) { |
|
|
|
case RoQ_INFO: |
|
if (roq->video_stream_index == -1) { |
|
AVStream *st = avformat_new_stream(s, NULL); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
avpriv_set_pts_info(st, 63, 1, roq->frame_rate); |
|
roq->video_stream_index = st->index; |
|
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
|
st->codecpar->codec_id = AV_CODEC_ID_ROQ; |
|
st->codecpar->codec_tag = 0; /* no fourcc */ |
|
|
|
if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE) |
|
return AVERROR(EIO); |
|
st->codecpar->width = roq->width = AV_RL16(preamble); |
|
st->codecpar->height = roq->height = AV_RL16(preamble + 2); |
|
break; |
|
} |
|
/* don't care about this chunk anymore */ |
|
avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE); |
|
break; |
|
|
|
case RoQ_QUAD_CODEBOOK: |
|
if (roq->video_stream_index < 0) |
|
return AVERROR_INVALIDDATA; |
|
/* packet needs to contain both this codebook and next VQ chunk */ |
|
codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE; |
|
codebook_size = chunk_size; |
|
avio_skip(pb, codebook_size); |
|
if (avio_read(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 */ |
|
avio_seek(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++; |
|
|
|
packet_read = 1; |
|
break; |
|
|
|
case RoQ_SOUND_MONO: |
|
case RoQ_SOUND_STEREO: |
|
if (roq->audio_stream_index == -1) { |
|
AVStream *st = avformat_new_stream(s, NULL); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE); |
|
roq->audio_stream_index = st->index; |
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
|
st->codecpar->codec_id = AV_CODEC_ID_ROQ_DPCM; |
|
st->codecpar->codec_tag = 0; /* no tag */ |
|
if (chunk_type == RoQ_SOUND_STEREO) { |
|
st->codecpar->channels = 2; |
|
st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
|
} else { |
|
st->codecpar->channels = 1; |
|
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
|
} |
|
roq->audio_channels = st->codecpar->channels; |
|
st->codecpar->sample_rate = RoQ_AUDIO_SAMPLE_RATE; |
|
st->codecpar->bits_per_coded_sample = 16; |
|
st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate * |
|
st->codecpar->bits_per_coded_sample; |
|
st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample; |
|
} |
|
case RoQ_QUAD_VQ: |
|
if (chunk_type == RoQ_QUAD_VQ) { |
|
if (roq->video_stream_index < 0) |
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
/* 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++; |
|
} else { |
|
pkt->stream_index = roq->audio_stream_index; |
|
pkt->pts = roq->audio_frame_count; |
|
roq->audio_frame_count += (chunk_size / roq->audio_channels); |
|
} |
|
|
|
pkt->pos= avio_tell(pb); |
|
ret = avio_read(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; |
|
} |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
AVInputFormat ff_roq_demuxer = { |
|
.name = "roq", |
|
.long_name = NULL_IF_CONFIG_SMALL("id RoQ"), |
|
.priv_data_size = sizeof(RoqDemuxContext), |
|
.read_probe = roq_probe, |
|
.read_header = roq_read_header, |
|
.read_packet = roq_read_packet, |
|
};
|
|
|