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ffmpeg/libavformat/raw.c

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/*
* RAW encoder and decoder
* Copyright (c) 2001 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avformat.h"
#ifdef CONFIG_ENCODERS
/* simple formats */
static int raw_write_header(struct AVFormatContext *s)
{
return 0;
}
static int raw_write_packet(struct AVFormatContext *s, int stream_index,
const uint8_t *buf, int size, int64_t pts)
{
put_buffer(&s->pb, buf, size);
put_flush_packet(&s->pb);
return 0;
}
static int raw_write_trailer(struct AVFormatContext *s)
{
return 0;
}
#endif //CONFIG_ENCODERS
/* raw input */
static int raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
AVStream *st;
int id;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
if (ap) {
id = s->iformat->value;
if (id == CODEC_ID_RAWVIDEO) {
st->codec.codec_type = CODEC_TYPE_VIDEO;
} else {
st->codec.codec_type = CODEC_TYPE_AUDIO;
}
st->codec.codec_id = id;
switch(st->codec.codec_type) {
case CODEC_TYPE_AUDIO:
st->codec.sample_rate = ap->sample_rate;
st->codec.channels = ap->channels;
break;
case CODEC_TYPE_VIDEO:
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate_base = ap->frame_rate_base;
st->codec.width = ap->width;
st->codec.height = ap->height;
st->codec.pix_fmt = ap->pix_fmt;
break;
default:
return -1;
}
} else {
return -1;
}
return 0;
}
#define RAW_PACKET_SIZE 1024
static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size;
// AVStream *st = s->streams[0];
size= RAW_PACKET_SIZE;
if (av_new_packet(pkt, size) < 0)
return -EIO;
pkt->stream_index = 0;
ret = get_buffer(&s->pb, pkt->data, size);
if (ret <= 0) {
av_free_packet(pkt);
return -EIO;
}
/* note: we need to modify the packet size here to handle the last
packet */
pkt->size = ret;
return ret;
}
static int raw_read_close(AVFormatContext *s)
{
return 0;
}
int pcm_read_seek(AVFormatContext *s,
int stream_index, int64_t timestamp)
{
AVStream *st;
int block_align, byte_rate;
int64_t pos;
st = s->streams[0];
switch(st->codec.codec_id) {
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
case CODEC_ID_PCM_U16BE:
block_align = 2 * st->codec.channels;
byte_rate = block_align * st->codec.sample_rate;
break;
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_U8:
case CODEC_ID_PCM_MULAW:
case CODEC_ID_PCM_ALAW:
block_align = st->codec.channels;
byte_rate = block_align * st->codec.sample_rate;
break;
default:
block_align = st->codec.block_align;
byte_rate = st->codec.bit_rate / 8;
break;
}
if (block_align <= 0 || byte_rate <= 0)
return -1;
/* compute the position by aligning it to block_align */
pos = (timestamp * byte_rate) / AV_TIME_BASE;
pos = (pos / block_align) * block_align;
/* recompute exact position */
st->cur_dts = (pos * AV_TIME_BASE) / byte_rate;
url_fseek(&s->pb, pos + s->data_offset, SEEK_SET);
return 0;
}
/* ac3 read */
static int ac3_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_id = CODEC_ID_AC3;
st->need_parsing = 1;
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
/* mpeg1/h263 input */
static int video_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = s->iformat->value;
st->need_parsing = 1;
/* for mjpeg, specify frame rate */
/* for mpeg4 specify it too (most mpeg4 streams dont have the fixed_vop_rate set ...)*/
if (st->codec.codec_id == CODEC_ID_MJPEG ||
st->codec.codec_id == CODEC_ID_MPEG4) {
if (ap && ap->frame_rate) {
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate_base = ap->frame_rate_base;
} else {
st->codec.frame_rate = 25;
st->codec.frame_rate_base = 1;
}
}
return 0;
}
#define SEQ_START_CODE 0x000001b3
#define GOP_START_CODE 0x000001b8
#define PICTURE_START_CODE 0x00000100
/* XXX: improve that by looking at several start codes */
static int mpegvideo_probe(AVProbeData *p)
{
int code;
const uint8_t *d;
/* we search the first start code. If it is a sequence, gop or
picture start code then we decide it is an mpeg video
stream. We do not send highest value to give a chance to mpegts */
/* NOTE: the search range was restricted to avoid too many false
detections */
if (p->buf_size < 6)
return 0;
d = p->buf;
code = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | (d[3]);
if ((code & 0xffffff00) == 0x100) {
if (code == SEQ_START_CODE ||
code == GOP_START_CODE ||
code == PICTURE_START_CODE)
return 50 - 1;
else
return 0;
}
return 0;
}
static int h263_probe(AVProbeData *p)
{
int code;
const uint8_t *d;
if (p->buf_size < 6)
return 0;
d = p->buf;
code = (d[0] << 14) | (d[1] << 6) | (d[2] >> 2);
if (code == 0x20) {
return 50;
}
return 0;
}
AVInputFormat ac3_iformat = {
"ac3",
"raw ac3",
0,
NULL,
ac3_read_header,
raw_read_packet,
raw_read_close,
.extensions = "ac3",
};
#ifdef CONFIG_ENCODERS
AVOutputFormat ac3_oformat = {
"ac3",
"raw ac3",
"audio/x-ac3",
"ac3",
0,
CODEC_ID_AC3,
0,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
#endif //CONFIG_ENCODERS
AVInputFormat h263_iformat = {
"h263",
"raw h263",
0,
h263_probe,
video_read_header,
raw_read_packet,
raw_read_close,
// .extensions = "h263", //FIXME remove after writing mpeg4_probe
.value = CODEC_ID_H263,
};
#ifdef CONFIG_ENCODERS
AVOutputFormat h263_oformat = {
"h263",
"raw h263",
"video/x-h263",
"h263",
0,
0,
CODEC_ID_H263,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
#endif //CONFIG_ENCODERS
AVInputFormat m4v_iformat = {
"m4v",
"raw MPEG4 video format",
0,
NULL /*mpegvideo_probe*/,
video_read_header,
raw_read_packet,
raw_read_close,
.extensions = "m4v", //FIXME remove after writing mpeg4_probe
.value = CODEC_ID_MPEG4,
};
#ifdef CONFIG_ENCODERS
AVOutputFormat m4v_oformat = {
"m4v",
"raw MPEG4 video format",
NULL,
"m4v",
0,
CODEC_ID_NONE,
CODEC_ID_MPEG4,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
#endif //CONFIG_ENCODERS
AVInputFormat h264_iformat = {
"h264",
"raw H264 video format",
0,
NULL /*mpegvideo_probe*/,
video_read_header,
raw_read_packet,
raw_read_close,
.extensions = "h26l,h264", //FIXME remove after writing mpeg4_probe
.value = CODEC_ID_H264,
};
#ifdef CONFIG_ENCODERS
AVOutputFormat h264_oformat = {
"h264",
"raw H264 video format",
NULL,
"h264",
0,
CODEC_ID_NONE,
CODEC_ID_H264,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
#endif //CONFIG_ENCODERS
AVInputFormat mpegvideo_iformat = {
"mpegvideo",
"MPEG video",
0,
mpegvideo_probe,
video_read_header,
raw_read_packet,
raw_read_close,
.value = CODEC_ID_MPEG1VIDEO,
};
#ifdef CONFIG_ENCODERS
AVOutputFormat mpeg1video_oformat = {
"mpeg1video",
"MPEG video",
"video/x-mpeg",
"mpg,mpeg",
0,
0,
CODEC_ID_MPEG1VIDEO,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
#endif //CONFIG_ENCODERS
AVInputFormat mjpeg_iformat = {
"mjpeg",
"MJPEG video",
0,
NULL,
video_read_header,
raw_read_packet,
raw_read_close,
.extensions = "mjpg,mjpeg",
.value = CODEC_ID_MJPEG,
};
#ifdef CONFIG_ENCODERS
AVOutputFormat mjpeg_oformat = {
"mjpeg",
"MJPEG video",
"video/x-mjpeg",
"mjpg,mjpeg",
0,
0,
CODEC_ID_MJPEG,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
#endif //CONFIG_ENCODERS
/* pcm formats */
#define PCMINPUTDEF(name, long_name, ext, codec) \
AVInputFormat pcm_ ## name ## _iformat = {\
#name,\
long_name,\
0,\
NULL,\
raw_read_header,\
raw_read_packet,\
raw_read_close,\
pcm_read_seek,\
.extensions = ext,\
.value = codec,\
};
#if !defined(CONFIG_ENCODERS) && defined(CONFIG_DECODERS)
#define PCMDEF(name, long_name, ext, codec) \
PCMINPUTDEF(name, long_name, ext, codec)
#else
#define PCMDEF(name, long_name, ext, codec) \
PCMINPUTDEF(name, long_name, ext, codec)\
\
AVOutputFormat pcm_ ## name ## _oformat = {\
#name,\
long_name,\
NULL,\
ext,\
0,\
codec,\
0,\
raw_write_header,\
raw_write_packet,\
raw_write_trailer,\
};
#endif //CONFIG_ENCODERS
#ifdef WORDS_BIGENDIAN
#define BE_DEF(s) s
#define LE_DEF(s) NULL
#else
#define BE_DEF(s) NULL
#define LE_DEF(s) s
#endif
PCMDEF(s16le, "pcm signed 16 bit little endian format",
LE_DEF("sw"), CODEC_ID_PCM_S16LE)
PCMDEF(s16be, "pcm signed 16 bit big endian format",
BE_DEF("sw"), CODEC_ID_PCM_S16BE)
PCMDEF(u16le, "pcm unsigned 16 bit little endian format",
LE_DEF("uw"), CODEC_ID_PCM_U16LE)
PCMDEF(u16be, "pcm unsigned 16 bit big endian format",
BE_DEF("uw"), CODEC_ID_PCM_U16BE)
PCMDEF(s8, "pcm signed 8 bit format",
"sb", CODEC_ID_PCM_S8)
PCMDEF(u8, "pcm unsigned 8 bit format",
"ub", CODEC_ID_PCM_U8)
PCMDEF(mulaw, "pcm mu law format",
"ul", CODEC_ID_PCM_MULAW)
PCMDEF(alaw, "pcm A law format",
"al", CODEC_ID_PCM_ALAW)
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)
av_abort();
if (av_new_packet(pkt, packet_size) < 0)
return -EIO;
pkt->stream_index = 0;
#if 0
/* bypass buffered I/O */
ret = url_read(url_fileno(&s->pb), pkt->data, pkt->size);
#else
ret = get_buffer(&s->pb, pkt->data, pkt->size);
#endif
if (ret != pkt->size) {
av_free_packet(pkt);
return -EIO;
} else {
return 0;
}
}
AVInputFormat rawvideo_iformat = {
"rawvideo",
"raw video format",
0,
NULL,
raw_read_header,
rawvideo_read_packet,
raw_read_close,
.extensions = "yuv",
.value = CODEC_ID_RAWVIDEO,
};
#ifdef CONFIG_ENCODERS
AVOutputFormat rawvideo_oformat = {
"rawvideo",
"raw video format",
NULL,
"yuv",
0,
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
#endif //CONFIG_ENCODERS
#ifdef CONFIG_ENCODERS
static int null_write_packet(struct AVFormatContext *s,
int stream_index,
const uint8_t *buf, int size, int64_t pts)
{
return 0;
}
AVOutputFormat null_oformat = {
"null",
"null video format",
NULL,
NULL,
0,
#ifdef WORDS_BIGENDIAN
CODEC_ID_PCM_S16BE,
#else
CODEC_ID_PCM_S16LE,
#endif
CODEC_ID_RAWVIDEO,
raw_write_header,
null_write_packet,
raw_write_trailer,
.flags = AVFMT_NOFILE | AVFMT_RAWPICTURE,
};
#endif //CONFIG_ENCODERS
#ifndef CONFIG_ENCODERS
#define av_register_output_format(format)
#endif
#ifndef CONFIG_DECODERS
#define av_register_input_format(format)
#endif
int raw_init(void)
{
av_register_input_format(&ac3_iformat);
av_register_output_format(&ac3_oformat);
av_register_input_format(&h263_iformat);
av_register_output_format(&h263_oformat);
av_register_input_format(&m4v_iformat);
av_register_output_format(&m4v_oformat);
av_register_input_format(&h264_iformat);
av_register_output_format(&h264_oformat);
av_register_input_format(&mpegvideo_iformat);
av_register_output_format(&mpeg1video_oformat);
av_register_input_format(&mjpeg_iformat);
av_register_output_format(&mjpeg_oformat);
av_register_input_format(&pcm_s16le_iformat);
av_register_output_format(&pcm_s16le_oformat);
av_register_input_format(&pcm_s16be_iformat);
av_register_output_format(&pcm_s16be_oformat);
av_register_input_format(&pcm_u16le_iformat);
av_register_output_format(&pcm_u16le_oformat);
av_register_input_format(&pcm_u16be_iformat);
av_register_output_format(&pcm_u16be_oformat);
av_register_input_format(&pcm_s8_iformat);
av_register_output_format(&pcm_s8_oformat);
av_register_input_format(&pcm_u8_iformat);
av_register_output_format(&pcm_u8_oformat);
av_register_input_format(&pcm_mulaw_iformat);
av_register_output_format(&pcm_mulaw_oformat);
av_register_input_format(&pcm_alaw_iformat);
av_register_output_format(&pcm_alaw_oformat);
av_register_input_format(&rawvideo_iformat);
av_register_output_format(&rawvideo_oformat);
av_register_output_format(&null_oformat);
return 0;
}
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