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ffmpeg/libavformat/rawdec.c

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/*
* RAW demuxers
* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2005 Alex Beregszaszi
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "avio_internal.h"
#include "rawdec.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
/* raw input */
int ff_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: {
RawAudioDemuxerContext *s1 = s->priv_data;
st->codec->channels = 1;
if (s1->sample_rate)
st->codec->sample_rate = s1->sample_rate;
if (s1->channels)
st->codec->channels = s1->channels;
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: {
FFRawVideoDemuxerContext *s1 = s->priv_data;
int width = 0, height = 0, ret = 0;
enum PixelFormat pix_fmt;
AVRational framerate;
if (s1->video_size && (ret = av_parse_video_size(&width, &height, s1->video_size)) < 0) {
av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
goto fail;
}
if ((pix_fmt = av_get_pix_fmt(s1->pixel_format)) == PIX_FMT_NONE) {
av_log(s, AV_LOG_ERROR, "No such pixel format: %s.\n", s1->pixel_format);
ret = AVERROR(EINVAL);
goto fail;
}
if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
goto fail;
}
av_set_pts_info(st, 64, framerate.den, framerate.num);
st->codec->width = width;
st->codec->height = height;
st->codec->pix_fmt = pix_fmt;
fail:
return ret;
}
default:
return -1;
}
return 0;
}
#define RAW_PACKET_SIZE 1024
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= avio_tell(s->pb);
pkt->stream_index = 0;
ret = ffio_read_partial(s->pb, pkt->data, size);
if (ret < 0) {
av_free_packet(pkt);
return ret;
}
pkt->size = ret;
return ret;
}
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;
FFRawVideoDemuxerContext *s1 = s->priv_data;
AVRational framerate;
int ret = 0;
st = av_new_stream(s, 0);
if (!st) {
ret = AVERROR(ENOMEM);
goto fail;
}
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = s->iformat->value;
st->need_parsing = AVSTREAM_PARSE_FULL;
if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
goto fail;
}
st->codec->time_base = (AVRational){framerate.den, framerate.num};
av_set_pts_info(st, 64, 1, 1200000);
fail:
return ret;
}
/* Note: Do not forget to add new entries to the Makefile as well. */
static const AVOption audio_options[] = {
{ "sample_rate", "", offsetof(RawAudioDemuxerContext, sample_rate), FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "channels", "", offsetof(RawAudioDemuxerContext, channels), FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
const AVClass ff_rawaudio_demuxer_class = {
.class_name = "rawaudio demuxer",
.item_name = av_default_item_name,
.option = audio_options,
.version = LIBAVUTIL_VERSION_INT,
};
#define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption video_options[] = {
{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), FF_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "pixel_format", "", OFFSET(pixel_format), FF_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
{ "framerate", "", OFFSET(framerate), FF_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC },
{ NULL },
};
#undef OFFSET
#undef DEC
const AVClass ff_rawvideo_demuxer_class = {
.class_name = "rawvideo demuxer",
.item_name = av_default_item_name,
.option = video_options,
.version = LIBAVUTIL_VERSION_INT,
};
#if CONFIG_G722_DEMUXER
AVInputFormat ff_g722_demuxer = {
.name = "g722",
.long_name = NULL_IF_CONFIG_SMALL("raw G.722"),
.priv_data_size = sizeof(RawAudioDemuxerContext),
.read_header = ff_raw_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "g722,722",
.value = CODEC_ID_ADPCM_G722,
.priv_class = &ff_rawaudio_demuxer_class,
};
#endif
#if CONFIG_GSM_DEMUXER
AVInputFormat ff_gsm_demuxer = {
.name = "gsm",
.long_name = NULL_IF_CONFIG_SMALL("raw GSM"),
.read_header = ff_raw_audio_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "gsm",
.value = CODEC_ID_GSM,
};
#endif
#if CONFIG_MJPEG_DEMUXER
FF_DEF_RAWVIDEO_DEMUXER(mjpeg, "raw MJPEG video", NULL, "mjpg,mjpeg", CODEC_ID_MJPEG)
#endif
#if CONFIG_MLP_DEMUXER
AVInputFormat ff_mlp_demuxer = {
.name = "mlp",
.long_name = NULL_IF_CONFIG_SMALL("raw MLP"),
.read_header = ff_raw_audio_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "mlp",
.value = CODEC_ID_MLP,
};
#endif
#if CONFIG_TRUEHD_DEMUXER
AVInputFormat ff_truehd_demuxer = {
.name = "truehd",
.long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"),
.read_header = ff_raw_audio_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "thd",
.value = CODEC_ID_TRUEHD,
};
#endif
#if CONFIG_SHORTEN_DEMUXER
AVInputFormat ff_shorten_demuxer = {
.name = "shn",
.long_name = NULL_IF_CONFIG_SMALL("raw Shorten"),
.read_header = ff_raw_audio_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "shn",
.value = CODEC_ID_SHORTEN,
};
#endif
#if CONFIG_VC1_DEMUXER
FF_DEF_RAWVIDEO_DEMUXER(vc1, "raw VC-1", NULL, "vc1", CODEC_ID_VC1)
#endif
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