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FFmpeg/libavformat/raw.c

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/*
* RAW muxer and demuxer
* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2005 Alex Beregszaszi
*
* 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
*/
#include "avformat.h"
#include "raw.h"
/* simple formats */
#if CONFIG_MUXERS
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
{
put_buffer(s->pb, pkt->data, pkt->size);
put_flush_packet(s->pb);
return 0;
}
#endif
#if CONFIG_DEMUXERS
/* raw input */
static int raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
AVStream *st;
enum CodecID id;
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
id = s->iformat->value;
if (id == CODEC_ID_RAWVIDEO) {
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
} else {
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
}
st->codec->codec_id = id;
switch(st->codec->codec_type) {
case AVMEDIA_TYPE_AUDIO:
st->codec->sample_rate = ap->sample_rate;
if(ap->channels) st->codec->channels = ap->channels;
else st->codec->channels = 1;
st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
assert(st->codec->bits_per_coded_sample > 0);
st->codec->block_align = st->codec->bits_per_coded_sample*st->codec->channels/8;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
break;
case AVMEDIA_TYPE_VIDEO:
if(ap->time_base.num)
av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);
else
av_set_pts_info(st, 64, 1, 25);
st->codec->width = ap->width;
st->codec->height = ap->height;
st->codec->pix_fmt = ap->pix_fmt;
if(st->codec->pix_fmt == PIX_FMT_NONE)
st->codec->pix_fmt= PIX_FMT_YUV420P;
break;
default:
return -1;
}
return 0;
}
#define RAW_PACKET_SIZE 1024
#define RAW_SAMPLES 1024
static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size, bps;
// AVStream *st = s->streams[0];
size= RAW_SAMPLES*s->streams[0]->codec->block_align;
ret= av_get_packet(s->pb, pkt, size);
pkt->stream_index = 0;
if (ret < 0)
return ret;
bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id);
assert(bps); // if false there IS a bug elsewhere (NOT in this function)
pkt->dts=
pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
return ret;
}
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size;
size = RAW_PACKET_SIZE;
if (av_new_packet(pkt, size) < 0)
return AVERROR(ENOMEM);
pkt->pos= url_ftell(s->pb);
pkt->stream_index = 0;
ret = get_partial_buffer(s->pb, pkt->data, size);
if (ret < 0) {
av_free_packet(pkt);
return ret;
}
pkt->size = ret;
return ret;
}
#endif
#if CONFIG_RAWVIDEO_DEMUXER
static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int packet_size, ret, width, height;
AVStream *st = s->streams[0];
width = st->codec->width;
height = st->codec->height;
packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
if (packet_size < 0)
return -1;
ret= av_get_packet(s->pb, pkt, packet_size);
pkt->pts=
pkt->dts= pkt->pos / packet_size;
pkt->stream_index = 0;
if (ret < 0)
return ret;
return 0;
}
#endif
#if CONFIG_DEMUXERS
int pcm_read_seek(AVFormatContext *s,
int stream_index, int64_t timestamp, int flags)
{
AVStream *st;
int block_align, byte_rate;
int64_t pos, ret;
st = s->streams[0];
block_align = st->codec->block_align ? st->codec->block_align :
(av_get_bits_per_sample(st->codec->codec_id) * st->codec->channels) >> 3;
byte_rate = st->codec->bit_rate ? st->codec->bit_rate >> 3 :
block_align * st->codec->sample_rate;
if (block_align <= 0 || byte_rate <= 0)
return -1;
if (timestamp < 0) timestamp = 0;
/* compute the position by aligning it to block_align */
pos = av_rescale_rnd(timestamp * byte_rate,
st->time_base.num,
st->time_base.den * (int64_t)block_align,
(flags & AVSEEK_FLAG_BACKWARD) ? AV_ROUND_DOWN : AV_ROUND_UP);
pos *= block_align;
/* recompute exact position */
st->cur_dts = av_rescale(pos, st->time_base.den, byte_rate * (int64_t)st->time_base.num);
if ((ret = url_fseek(s->pb, pos + s->data_offset, SEEK_SET)) < 0)
return ret;
return 0;
}
int ff_raw_audio_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = s->iformat->value;
st->need_parsing = AVSTREAM_PARSE_FULL;
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
/* MPEG-1/H.263 input */
int ff_raw_video_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = s->iformat->value;
st->need_parsing = AVSTREAM_PARSE_FULL;
/* for MJPEG, specify frame rate */
/* for MPEG-4 specify it, too (most MPEG-4 streams do not have the fixed_vop_rate set ...)*/
if (ap->time_base.num) {
st->codec->time_base= ap->time_base;
} else if ( st->codec->codec_id == CODEC_ID_MJPEG ||
st->codec->codec_id == CODEC_ID_MPEG4 ||
st->codec->codec_id == CODEC_ID_DIRAC ||
st->codec->codec_id == CODEC_ID_DNXHD ||
st->codec->codec_id == CODEC_ID_VC1 ||
st->codec->codec_id == CODEC_ID_H264) {
st->codec->time_base= (AVRational){1,25};
}
av_set_pts_info(st, 64, 1, 1200000);
return 0;
}
#endif
/* Note: Do not forget to add new entries to the Makefile as well. */
#if CONFIG_AC3_MUXER
AVOutputFormat ac3_muxer = {
"ac3",
NULL_IF_CONFIG_SMALL("raw AC-3"),
"audio/x-ac3",
"ac3",
0,
CODEC_ID_AC3,
CODEC_ID_NONE,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_DIRAC_MUXER
AVOutputFormat dirac_muxer = {
"dirac",
NULL_IF_CONFIG_SMALL("raw Dirac"),
NULL,
"drc",
0,
CODEC_ID_NONE,
CODEC_ID_DIRAC,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_DNXHD_MUXER
AVOutputFormat dnxhd_muxer = {
"dnxhd",
NULL_IF_CONFIG_SMALL("raw DNxHD (SMPTE VC-3)"),
NULL,
"dnxhd",
0,
CODEC_ID_NONE,
CODEC_ID_DNXHD,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_DTS_MUXER
AVOutputFormat dts_muxer = {
"dts",
NULL_IF_CONFIG_SMALL("raw DTS"),
"audio/x-dca",
"dts",
0,
CODEC_ID_DTS,
CODEC_ID_NONE,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_EAC3_MUXER
AVOutputFormat eac3_muxer = {
"eac3",
NULL_IF_CONFIG_SMALL("raw E-AC-3"),
"audio/x-eac3",
"eac3",
0,
CODEC_ID_EAC3,
CODEC_ID_NONE,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_GSM_DEMUXER
AVInputFormat gsm_demuxer = {
"gsm",
NULL_IF_CONFIG_SMALL("raw GSM"),
0,
NULL,
ff_raw_audio_read_header,
ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "gsm",
.value = CODEC_ID_GSM,
};
#endif
#if CONFIG_H261_MUXER
AVOutputFormat h261_muxer = {
"h261",
NULL_IF_CONFIG_SMALL("raw H.261"),
"video/x-h261",
"h261",
0,
CODEC_ID_NONE,
CODEC_ID_H261,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_H263_MUXER
AVOutputFormat h263_muxer = {
"h263",
NULL_IF_CONFIG_SMALL("raw H.263"),
"video/x-h263",
"h263",
0,
CODEC_ID_NONE,
CODEC_ID_H263,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_H264_MUXER
AVOutputFormat h264_muxer = {
"h264",
NULL_IF_CONFIG_SMALL("raw H.264 video format"),
NULL,
"h264",
0,
CODEC_ID_NONE,
CODEC_ID_H264,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_CAVSVIDEO_MUXER
AVOutputFormat cavsvideo_muxer = {
"cavsvideo",
NULL_IF_CONFIG_SMALL("raw Chinese AVS video"),
NULL,
"cavs",
0,
CODEC_ID_NONE,
CODEC_ID_CAVS,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_M4V_MUXER
AVOutputFormat m4v_muxer = {
"m4v",
NULL_IF_CONFIG_SMALL("raw MPEG-4 video format"),
NULL,
"m4v",
0,
CODEC_ID_NONE,
CODEC_ID_MPEG4,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_MJPEG_DEMUXER
AVInputFormat mjpeg_demuxer = {
"mjpeg",
NULL_IF_CONFIG_SMALL("raw MJPEG video"),
0,
NULL,
ff_raw_video_read_header,
ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "mjpg,mjpeg",
.value = CODEC_ID_MJPEG,
};
#endif
#if CONFIG_MJPEG_MUXER
AVOutputFormat mjpeg_muxer = {
"mjpeg",
NULL_IF_CONFIG_SMALL("raw MJPEG video"),
"video/x-mjpeg",
"mjpg,mjpeg",
0,
CODEC_ID_NONE,
CODEC_ID_MJPEG,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_MLP_DEMUXER
AVInputFormat mlp_demuxer = {
"mlp",
NULL_IF_CONFIG_SMALL("raw MLP"),
0,
NULL,
ff_raw_audio_read_header,
ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "mlp",
.value = CODEC_ID_MLP,
};
#endif
#if CONFIG_MLP_MUXER
AVOutputFormat mlp_muxer = {
"mlp",
NULL_IF_CONFIG_SMALL("raw MLP"),
NULL,
"mlp",
0,
CODEC_ID_MLP,
CODEC_ID_NONE,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_SRT_MUXER
AVOutputFormat srt_muxer = {
.name = "srt",
.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle format"),
.mime_type = "application/x-subrip",
.extensions = "srt",
.write_packet = ff_raw_write_packet,
.flags = AVFMT_NOTIMESTAMPS,
.subtitle_codec = CODEC_ID_SRT,
};
#endif
#if CONFIG_TRUEHD_DEMUXER
AVInputFormat truehd_demuxer = {
"truehd",
NULL_IF_CONFIG_SMALL("raw TrueHD"),
0,
NULL,
ff_raw_audio_read_header,
ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "thd",
.value = CODEC_ID_TRUEHD,
};
#endif
#if CONFIG_TRUEHD_MUXER
AVOutputFormat truehd_muxer = {
"truehd",
NULL_IF_CONFIG_SMALL("raw TrueHD"),
NULL,
"thd",
0,
CODEC_ID_TRUEHD,
CODEC_ID_NONE,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_MPEG1VIDEO_MUXER
AVOutputFormat mpeg1video_muxer = {
"mpeg1video",
NULL_IF_CONFIG_SMALL("raw MPEG-1 video"),
"video/x-mpeg",
"mpg,mpeg,m1v",
0,
CODEC_ID_NONE,
CODEC_ID_MPEG1VIDEO,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_MPEG2VIDEO_MUXER
AVOutputFormat mpeg2video_muxer = {
"mpeg2video",
NULL_IF_CONFIG_SMALL("raw MPEG-2 video"),
NULL,
"m2v",
0,
CODEC_ID_NONE,
CODEC_ID_MPEG2VIDEO,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_RAWVIDEO_DEMUXER
AVInputFormat rawvideo_demuxer = {
"rawvideo",
NULL_IF_CONFIG_SMALL("raw video format"),
0,
NULL,
raw_read_header,
rawvideo_read_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "yuv,cif,qcif,rgb",
.value = CODEC_ID_RAWVIDEO,
};
#endif
#if CONFIG_RAWVIDEO_MUXER
AVOutputFormat rawvideo_muxer = {
"rawvideo",
NULL_IF_CONFIG_SMALL("raw video format"),
NULL,
"yuv,rgb",
0,
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
NULL,
ff_raw_write_packet,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif
#if CONFIG_SHORTEN_DEMUXER
AVInputFormat shorten_demuxer = {
"shn",
NULL_IF_CONFIG_SMALL("raw Shorten"),
0,
NULL,
ff_raw_audio_read_header,
ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "shn",
.value = CODEC_ID_SHORTEN,
};
#endif
#if CONFIG_VC1_DEMUXER
AVInputFormat vc1_demuxer = {
"vc1",
NULL_IF_CONFIG_SMALL("raw VC-1"),
0,
NULL /* vc1_probe */,
ff_raw_video_read_header,
ff_raw_read_partial_packet,
.extensions = "vc1",
.value = CODEC_ID_VC1,
};
#endif
/* PCM formats */
#define PCMINPUTDEF(name, long_name, ext, codec) \
AVInputFormat pcm_ ## name ## _demuxer = {\
#name,\
NULL_IF_CONFIG_SMALL(long_name),\
0,\
NULL,\
raw_read_header,\
raw_read_packet,\
NULL,\
pcm_read_seek,\
.flags= AVFMT_GENERIC_INDEX,\
.extensions = ext,\
.value = codec,\
};
#define PCMOUTPUTDEF(name, long_name, ext, codec) \
AVOutputFormat pcm_ ## name ## _muxer = {\
#name,\
NULL_IF_CONFIG_SMALL(long_name),\
NULL,\
ext,\
0,\
codec,\
CODEC_ID_NONE,\
NULL,\
ff_raw_write_packet,\
.flags= AVFMT_NOTIMESTAMPS,\
};
#if !CONFIG_MUXERS && CONFIG_DEMUXERS
#define PCMDEF(name, long_name, ext, codec) \
PCMINPUTDEF(name, long_name, ext, codec)
#elif CONFIG_MUXERS && !CONFIG_DEMUXERS
#define PCMDEF(name, long_name, ext, codec) \
PCMOUTPUTDEF(name, long_name, ext, codec)
#elif CONFIG_MUXERS && CONFIG_DEMUXERS
#define PCMDEF(name, long_name, ext, codec) \
PCMINPUTDEF(name, long_name, ext, codec)\
PCMOUTPUTDEF(name, long_name, ext, codec)
#else
#define PCMDEF(name, long_name, ext, codec)
#endif
PCMDEF(f64be, "PCM 64 bit floating-point big-endian format",
NULL, CODEC_ID_PCM_F64BE)
PCMDEF(f64le, "PCM 64 bit floating-point little-endian format",
NULL, CODEC_ID_PCM_F64LE)
PCMDEF(f32be, "PCM 32 bit floating-point big-endian format",
NULL, CODEC_ID_PCM_F32BE)
PCMDEF(f32le, "PCM 32 bit floating-point little-endian format",
NULL, CODEC_ID_PCM_F32LE)
PCMDEF(s32be, "PCM signed 32 bit big-endian format",
NULL, CODEC_ID_PCM_S32BE)
PCMDEF(s32le, "PCM signed 32 bit little-endian format",
NULL, CODEC_ID_PCM_S32LE)
PCMDEF(s24be, "PCM signed 24 bit big-endian format",
NULL, CODEC_ID_PCM_S24BE)
PCMDEF(s24le, "PCM signed 24 bit little-endian format",
NULL, CODEC_ID_PCM_S24LE)
PCMDEF(s16be, "PCM signed 16 bit big-endian format",
AV_NE("sw", NULL), CODEC_ID_PCM_S16BE)
PCMDEF(s16le, "PCM signed 16 bit little-endian format",
AV_NE(NULL, "sw"), CODEC_ID_PCM_S16LE)
PCMDEF(s8, "PCM signed 8 bit format",
"sb", CODEC_ID_PCM_S8)
PCMDEF(u32be, "PCM unsigned 32 bit big-endian format",
NULL, CODEC_ID_PCM_U32BE)
PCMDEF(u32le, "PCM unsigned 32 bit little-endian format",
NULL, CODEC_ID_PCM_U32LE)
PCMDEF(u24be, "PCM unsigned 24 bit big-endian format",
NULL, CODEC_ID_PCM_U24BE)
PCMDEF(u24le, "PCM unsigned 24 bit little-endian format",
NULL, CODEC_ID_PCM_U24LE)
PCMDEF(u16be, "PCM unsigned 16 bit big-endian format",
AV_NE("uw", NULL), CODEC_ID_PCM_U16BE)
PCMDEF(u16le, "PCM unsigned 16 bit little-endian format",
AV_NE(NULL, "uw"), CODEC_ID_PCM_U16LE)
PCMDEF(u8, "PCM unsigned 8 bit format",
"ub", CODEC_ID_PCM_U8)
PCMDEF(alaw, "PCM A-law format",
"al", CODEC_ID_PCM_ALAW)
PCMDEF(mulaw, "PCM mu-law format",
"ul", CODEC_ID_PCM_MULAW)