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ffmpeg/libav/raw.c

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/*
* RAW encoder and decoder
* Copyright (c) 2001 Gerard Lantau.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "avformat.h"
/* simple formats */
int raw_write_header(struct AVFormatContext *s)
{
return 0;
}
int raw_write_packet(struct AVFormatContext *s,
int stream_index,
unsigned char *buf, int size, int force_pts)
{
put_buffer(&s->pb, buf, size);
put_flush_packet(&s->pb);
return 0;
}
int raw_write_trailer(struct AVFormatContext *s)
{
return 0;
}
/* 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.width = ap->width;
st->codec.height = ap->height;
break;
default:
return -1;
}
} else {
return -1;
}
return 0;
}
#define RAW_PACKET_SIZE 1024
int raw_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
int ret;
if (av_new_packet(pkt, RAW_PACKET_SIZE) < 0)
return -EIO;
pkt->stream_index = 0;
ret = get_buffer(&s->pb, pkt->data, RAW_PACKET_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;
}
int raw_read_close(AVFormatContext *s)
{
return 0;
}
/* mp3 read */
static int mp3_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_MP2;
/* 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;
/* for mjpeg, specify frame rate */
if (st->codec.codec_id == CODEC_ID_MJPEG) {
if (ap) {
st->codec.frame_rate = ap->frame_rate;
} else {
st->codec.frame_rate = 25 * FRAME_RATE_BASE;
}
}
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, c, i;
code = 0xff;
/* 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 */
for(i=0;i<p->buf_size;i++) {
c = p->buf[i];
code = (code << 8) | c;
if ((code & 0xffffff00) == 0x100) {
if (code == SEQ_START_CODE ||
code == GOP_START_CODE ||
code == PICTURE_START_CODE)
return AVPROBE_SCORE_MAX - 1;
else
return 0;
}
}
return 0;
}
AVInputFormat mp3_iformat = {
"mp3",
"MPEG audio",
0,
NULL,
mp3_read_header,
raw_read_packet,
raw_read_close,
extensions: "mp2,mp3", /* XXX: use probe */
};
AVOutputFormat mp2_oformat = {
"mp2",
"MPEG audio layer 2",
"audio/x-mpeg",
"mp2,mp3",
0,
CODEC_ID_MP2,
0,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
AVInputFormat ac3_iformat = {
"ac3",
"raw ac3",
0,
NULL,
raw_read_header,
raw_read_packet,
raw_read_close,
extensions: "ac3",
value: CODEC_ID_AC3,
};
AVOutputFormat ac3_oformat = {
"ac3",
"raw ac3",
"audio/x-ac3",
"ac3",
0,
CODEC_ID_AC3,
0,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
AVOutputFormat h263_oformat = {
"h263",
"raw h263",
"video/x-h263",
"h263",
0,
0,
CODEC_ID_H263,
raw_write_header,
raw_write_packet,
raw_write_trailer,
};
AVInputFormat mpegvideo_iformat = {
"mpegvideo",
"MPEG video",
0,
mpegvideo_probe,
video_read_header,
raw_read_packet,
raw_read_close,
value: CODEC_ID_MPEG1VIDEO,
};
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,
};
AVInputFormat mjpeg_iformat = {
"mjpeg",
"MJPEG video",
0,
NULL,
video_read_header,
raw_read_packet,
raw_read_close,
extensions: "mjpg,mjpeg",
value: CODEC_ID_MJPEG,
};
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,
};
/* pcm formats */
#define PCMDEF(name, long_name, ext, codec) \
AVInputFormat pcm_ ## name ## _iformat = {\
#name,\
long_name,\
0,\
NULL,\
raw_read_header,\
raw_read_packet,\
raw_read_close,\
extensions: ext,\
value: codec,\
};\
\
AVOutputFormat pcm_ ## name ## _oformat = {\
#name,\
long_name,\
NULL,\
ext,\
0,\
codec,\
0,\
raw_write_header,\
raw_write_packet,\
raw_write_trailer,\
};
#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)
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;
switch(st->codec.pix_fmt) {
case PIX_FMT_YUV420P:
packet_size = (width * height * 3) / 2;
break;
case PIX_FMT_YUV422:
packet_size = (width * height * 2);
break;
case PIX_FMT_BGR24:
case PIX_FMT_RGB24:
packet_size = (width * height * 3);
break;
default:
abort();
break;
}
if (av_new_packet(pkt, packet_size) < 0)
return -EIO;
pkt->stream_index = 0;
/* bypass buffered I/O */
ret = url_read(url_fileno(&s->pb), pkt->data, pkt->size);
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,
};
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,
};
int raw_init(void)
{
av_register_input_format(&mp3_iformat);
av_register_output_format(&mp2_oformat);
av_register_input_format(&ac3_iformat);
av_register_output_format(&ac3_oformat);
av_register_output_format(&h263_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);
return 0;
}
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