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ffmpeg/libavformat/img.c

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/*
* Image format
* Copyright (c) 2000, 2001, 2002 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 <unistd.h>
#include "avformat.h"
extern AVInputFormat pgm_iformat;
extern AVOutputFormat pgm_oformat;
extern AVInputFormat pgmyuv_iformat;
extern AVOutputFormat pgmyuv_oformat;
extern AVInputFormat ppm_iformat;
extern AVOutputFormat ppm_oformat;
extern AVInputFormat imgyuv_iformat;
extern AVOutputFormat imgyuv_oformat;
extern AVInputFormat pgmpipe_iformat;
extern AVOutputFormat pgmpipe_oformat;
extern AVInputFormat pgmyuvpipe_iformat;
extern AVOutputFormat pgmyuvpipe_oformat;
extern AVInputFormat ppmpipe_iformat;
extern AVOutputFormat ppmpipe_oformat;
extern AVOutputFormat yuv4mpegpipe_oformat;
#ifdef __MINGW32__
# include <windows.h>
# define usleep(t) Sleep((t) / 1000)
#endif
#ifdef __BEOS__
# ifndef usleep
# include <OS.h>
# define usleep(t) snooze((bigtime_t)(t))
# endif
#endif
#define IMGFMT_YUV 1
#define IMGFMT_PGMYUV 2
#define IMGFMT_PGM 3
#define IMGFMT_PPM 4
#define IMGFMT_YUV4MPEG 5
#define Y4M_MAGIC "YUV4MPEG2"
#define Y4M_FRAME_MAGIC "FRAME"
#define Y4M_LINE_MAX 256
typedef struct {
int width;
int height;
int img_number;
int img_size;
int img_fmt;
int is_pipe;
int header_written;
char path[1024];
} VideoData;
int emulate_frame_rate;
static inline int pnm_space(int c)
{
return (c==' ' || c=='\n' || c=='\r' || c=='\t');
}
static void pnm_get(ByteIOContext *f, char *str, int buf_size)
{
char *s;
int c;
do {
c=get_byte(f);
if (c=='#') {
do {
c=get_byte(f);
} while (c!='\n');
c=get_byte(f);
}
} while (pnm_space(c));
s=str;
do {
if (url_feof(f))
break;
if ((s - str) < buf_size - 1)
*s++=c;
c=get_byte(f);
} while (!pnm_space(c));
*s = '\0';
}
static int pgm_read(VideoData *s, ByteIOContext *f, UINT8 *buf, int size, int is_yuv)
{
int width, height, i;
char buf1[32];
UINT8 *picture[3];
width = s->width;
height = s->height;
pnm_get(f, buf1, sizeof(buf1));
if (strcmp(buf1, "P5")) {
return -EIO;
}
pnm_get(f, buf1, sizeof(buf1));
pnm_get(f, buf1, sizeof(buf1));
pnm_get(f, buf1, sizeof(buf1));
picture[0] = buf;
picture[1] = buf + width * height;
picture[2] = buf + width * height + (width * height / 4);
get_buffer(f, picture[0], width * height);
height>>=1;
width>>=1;
if (is_yuv) {
for(i=0;i<height;i++) {
get_buffer(f, picture[1] + i * width, width);
get_buffer(f, picture[2] + i * width, width);
}
} else {
for(i=0;i<height;i++) {
memset(picture[1] + i * width, 128, width);
memset(picture[2] + i * width, 128, width);
}
}
return 0;
}
static int ppm_read(VideoData *s, ByteIOContext *f, UINT8 *buf, int size)
{
int width, height;
char buf1[32];
UINT8 *picture[3];
width = s->width;
height = s->height;
pnm_get(f, buf1, sizeof(buf1));
if (strcmp(buf1, "P6")) {
return -EIO;
}
pnm_get(f, buf1, sizeof(buf1));
pnm_get(f, buf1, sizeof(buf1));
pnm_get(f, buf1, sizeof(buf1));
picture[0] = buf;
get_buffer(f, picture[0], width * height*3);
return 0;
}
static int yuv_read(VideoData *s, const char *filename, UINT8 *buf, int size1)
{
ByteIOContext pb1, *pb = &pb1;
char fname[1024], *p;
int size;
size = s->width * s->height;
strcpy(fname, filename);
p = strrchr(fname, '.');
if (!p || p[1] != 'Y')
return -EIO;
if (url_fopen(pb, fname, URL_RDONLY) < 0)
return -EIO;
get_buffer(pb, buf, size);
url_fclose(pb);
p[1] = 'U';
if (url_fopen(pb, fname, URL_RDONLY) < 0)
return -EIO;
get_buffer(pb, buf + size, size / 4);
url_fclose(pb);
p[1] = 'V';
if (url_fopen(pb, fname, URL_RDONLY) < 0)
return -EIO;
get_buffer(pb, buf + size + (size / 4), size / 4);
url_fclose(pb);
return 0;
}
static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
VideoData *s = s1->priv_data;
char filename[1024];
int ret;
ByteIOContext f1, *f;
static INT64 first_frame;
if (emulate_frame_rate) {
if (!first_frame) {
first_frame = av_gettime();
} else {
INT64 pts;
INT64 nowus;
nowus = av_gettime() - first_frame;
pts = ((INT64)s->img_number * FRAME_RATE_BASE * 1000000) / (s1->streams[0]->codec.frame_rate);
if (pts > nowus)
usleep(pts - nowus);
}
}
/*
This if-statement destroys pipes - I do not see why it is necessary
if (get_frame_filename(filename, sizeof(filename),
s->path, s->img_number) < 0)
return -EIO;
*/
get_frame_filename(filename, sizeof(filename),
s->path, s->img_number);
if (!s->is_pipe) {
f = &f1;
if (url_fopen(f, filename, URL_RDONLY) < 0)
return -EIO;
} else {
f = &s1->pb;
if (url_feof(f))
return -EIO;
}
av_new_packet(pkt, s->img_size);
pkt->stream_index = 0;
switch(s->img_fmt) {
case IMGFMT_PGMYUV:
ret = pgm_read(s, f, pkt->data, pkt->size, 1);
break;
case IMGFMT_PGM:
ret = pgm_read(s, f, pkt->data, pkt->size, 0);
break;
case IMGFMT_YUV:
ret = yuv_read(s, filename, pkt->data, pkt->size);
break;
case IMGFMT_PPM:
ret = ppm_read(s, f, pkt->data, pkt->size);
break;
default:
return -EIO;
}
if (!s->is_pipe) {
url_fclose(f);
}
if (ret < 0) {
av_free_packet(pkt);
return -EIO; /* signal EOF */
} else {
pkt->pts = ((INT64)s->img_number * s1->pts_den * FRAME_RATE_BASE) / (s1->streams[0]->codec.frame_rate * s1->pts_num);
s->img_number++;
return 0;
}
}
static int sizes[][2] = {
{ 640, 480 },
{ 720, 480 },
{ 720, 576 },
{ 352, 288 },
{ 352, 240 },
{ 160, 128 },
{ 512, 384 },
{ 640, 352 },
{ 640, 240 },
};
static int infer_size(int *width_ptr, int *height_ptr, int size)
{
int i;
for(i=0;i<sizeof(sizes)/sizeof(sizes[0]);i++) {
if ((sizes[i][0] * sizes[i][1]) == size) {
*width_ptr = sizes[i][0];
*height_ptr = sizes[i][1];
return 0;
}
}
return -1;
}
static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
VideoData *s = s1->priv_data;
int i, h;
char buf[1024];
char buf1[32];
ByteIOContext pb1, *f = &pb1;
AVStream *st;
st = av_new_stream(s1, 0);
if (!st) {
av_free(s);
return -ENOMEM;
}
strcpy(s->path, s1->filename);
s->img_number = 0;
/* find format */
if (s1->iformat->flags & AVFMT_NOFILE)
s->is_pipe = 0;
else
s->is_pipe = 1;
if (s1->iformat == &pgmyuvpipe_iformat ||
s1->iformat == &pgmyuv_iformat)
s->img_fmt = IMGFMT_PGMYUV;
else if (s1->iformat == &pgmpipe_iformat ||
s1->iformat == &pgm_iformat)
s->img_fmt = IMGFMT_PGM;
else if (s1->iformat == &imgyuv_iformat)
s->img_fmt = IMGFMT_YUV;
else if (s1->iformat == &ppmpipe_iformat ||
s1->iformat == &ppm_iformat)
s->img_fmt = IMGFMT_PPM;
else
goto fail;
if (!s->is_pipe) {
/* try to find the first image */
for(i=0;i<5;i++) {
if (get_frame_filename(buf, sizeof(buf), s->path, s->img_number) < 0)
goto fail;
if (url_fopen(f, buf, URL_RDONLY) >= 0)
break;
s->img_number++;
}
if (i == 5)
goto fail;
} else {
f = &s1->pb;
}
/* find the image size */
/* XXX: use generic file format guessing, as mpeg */
switch(s->img_fmt) {
case IMGFMT_PGM:
case IMGFMT_PGMYUV:
case IMGFMT_PPM:
pnm_get(f, buf1, sizeof(buf1));
pnm_get(f, buf1, sizeof(buf1));
s->width = atoi(buf1);
pnm_get(f, buf1, sizeof(buf1));
h = atoi(buf1);
if (s->img_fmt == IMGFMT_PGMYUV)
h = (h * 2) / 3;
s->height = h;
if (s->width <= 0 ||
s->height <= 0 ||
(s->width % 2) != 0 ||
(s->height % 2) != 0) {
goto fail1;
}
break;
case IMGFMT_YUV:
/* infer size by using the file size. */
{
int img_size;
URLContext *h;
/* XXX: hack hack */
h = url_fileno(f);
img_size = url_seek(h, 0, SEEK_END);
if (infer_size(&s->width, &s->height, img_size) < 0) {
goto fail1;
}
}
break;
}
if (!s->is_pipe) {
url_fclose(f);
} else {
url_fseek(f, 0, SEEK_SET);
}
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_RAWVIDEO;
st->codec.width = s->width;
st->codec.height = s->height;
if (s->img_fmt == IMGFMT_PPM) {
st->codec.pix_fmt = PIX_FMT_RGB24;
s->img_size = (s->width * s->height * 3);
} else {
st->codec.pix_fmt = PIX_FMT_YUV420P;
s->img_size = (s->width * s->height * 3) / 2;
}
if (!ap || !ap->frame_rate)
st->codec.frame_rate = 25 * FRAME_RATE_BASE;
else
st->codec.frame_rate = ap->frame_rate;
return 0;
fail1:
if (!s->is_pipe)
url_fclose(f);
fail:
av_free(s);
return -EIO;
}
static int img_read_close(AVFormatContext *s1)
{
return 0;
}
/******************************************************/
/* image output */
static int pgm_save(AVPicture *picture, int width, int height, ByteIOContext *pb, int is_yuv)
{
int i, h;
char buf[100];
UINT8 *ptr, *ptr1, *ptr2;
h = height;
if (is_yuv)
h = (height * 3) / 2;
snprintf(buf, sizeof(buf),
"P5\n%d %d\n%d\n",
width, h, 255);
put_buffer(pb, buf, strlen(buf));
ptr = picture->data[0];
for(i=0;i<height;i++) {
put_buffer(pb, ptr, width);
ptr += picture->linesize[0];
}
if (is_yuv) {
height >>= 1;
width >>= 1;
ptr1 = picture->data[1];
ptr2 = picture->data[2];
for(i=0;i<height;i++) {
put_buffer(pb, ptr1, width);
put_buffer(pb, ptr2, width);
ptr1 += picture->linesize[1];
ptr2 += picture->linesize[2];
}
}
put_flush_packet(pb);
return 0;
}
static int ppm_save(AVPicture *picture, int width, int height, ByteIOContext *pb)
{
int i;
char buf[100];
UINT8 *ptr;
snprintf(buf, sizeof(buf),
"P6\n%d %d\n%d\n",
width, height, 255);
put_buffer(pb, buf, strlen(buf));
ptr = picture->data[0];
for(i=0;i<height;i++) {
put_buffer(pb, ptr, width * 3);
ptr += picture->linesize[0];
}
put_flush_packet(pb);
return 0;
}
static int yuv_save(AVPicture *picture, int width, int height, const char *filename)
{
ByteIOContext pb1, *pb = &pb1;
char fname[1024], *p;
int i, j;
UINT8 *ptr;
static char *ext = "YUV";
strcpy(fname, filename);
p = strrchr(fname, '.');
if (!p || p[1] != 'Y')
return -EIO;
for(i=0;i<3;i++) {
if (i == 1) {
width >>= 1;
height >>= 1;
}
p[1] = ext[i];
if (url_fopen(pb, fname, URL_WRONLY) < 0)
return -EIO;
ptr = picture->data[i];
for(j=0;j<height;j++) {
put_buffer(pb, ptr, width);
ptr += picture->linesize[i];
}
put_flush_packet(pb);
url_fclose(pb);
}
return 0;
}
static int yuv4mpeg_save(AVPicture *picture, int width, int height, ByteIOContext *pb, int need_stream_header,
int is_yuv, int raten, int rated, int aspectn, int aspectd)
{
int i, n, m;
char buf[Y4M_LINE_MAX+1], buf1[20];
UINT8 *ptr, *ptr1, *ptr2;
/* construct stream header, if this is the first frame */
if(need_stream_header) {
n = snprintf(buf, sizeof(buf), "%s W%d H%d F%d:%d I%s A%d:%d\n",
Y4M_MAGIC,
width,
height,
raten, rated,
"p", /* ffmpeg seems to only output progressive video */
aspectn, aspectd);
if (n < 0) {
fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
} else {
fprintf(stderr, "YUV4MPEG stream header written. FPS is %d\n", raten);
put_buffer(pb, buf, strlen(buf));
}
}
/* construct frame header */
m = snprintf(buf1, sizeof(buf1), "%s \n", Y4M_FRAME_MAGIC);
if (m < 0) {
fprintf(stderr, "Error. YUV4MPEG frame header write failed.\n");
} else {
/* fprintf(stderr, "YUV4MPEG frame header written.\n"); */
put_buffer(pb, buf1, strlen(buf1));
}
ptr = picture->data[0];
for(i=0;i<height;i++) {
put_buffer(pb, ptr, width);
ptr += picture->linesize[0];
}
if (is_yuv) {
height >>= 1;
width >>= 1;
ptr1 = picture->data[1];
ptr2 = picture->data[2];
for(i=0;i<height;i++) { /* Cb */
put_buffer(pb, ptr1, width);
ptr1 += picture->linesize[1];
}
for(i=0;i<height;i++) { /* Cr */
put_buffer(pb, ptr2, width);
ptr2 += picture->linesize[2];
}
}
put_flush_packet(pb);
return 0;
}
static int img_write_header(AVFormatContext *s)
{
VideoData *img = s->priv_data;
img->img_number = 1;
strcpy(img->path, s->filename);
/* find format */
if (s->oformat->flags & AVFMT_NOFILE)
img->is_pipe = 0;
else
img->is_pipe = 1;
if (s->oformat == &pgmyuvpipe_oformat ||
s->oformat == &pgmyuv_oformat) {
img->img_fmt = IMGFMT_PGMYUV;
} else if (s->oformat == &pgmpipe_oformat ||
s->oformat == &pgm_oformat) {
img->img_fmt = IMGFMT_PGM;
} else if (s->oformat == &imgyuv_oformat) {
img->img_fmt = IMGFMT_YUV;
} else if (s->oformat == &ppmpipe_oformat ||
s->oformat == &ppm_oformat) {
img->img_fmt = IMGFMT_PPM;
} else if (s->oformat == &yuv4mpegpipe_oformat) {
img->img_fmt = IMGFMT_YUV4MPEG;
img->header_written = 0;
} else {
goto fail;
}
return 0;
fail:
av_free(img);
return -EIO;
}
static int img_write_packet(AVFormatContext *s, int stream_index,
UINT8 *buf, int size, int force_pts)
{
VideoData *img = s->priv_data;
AVStream *st = s->streams[stream_index];
ByteIOContext pb1, *pb;
AVPicture picture;
int width, height, need_stream_header, ret, size1, raten, rated, aspectn, aspectd, fps, fps1;
char filename[1024];
width = st->codec.width;
height = st->codec.height;
if (img->img_number == 1) {
need_stream_header = 1;
} else {
need_stream_header = 0;
}
fps = st->codec.frame_rate;
fps1 = (((float)fps / FRAME_RATE_BASE) * 1000);
/* Sorry about this messy code, but mpeg2enc is very picky about
* the framerates it accepts. */
switch(fps1) {
case 23976:
raten = 24000; /* turn the framerate into a ratio */
rated = 1001;
break;
case 29970:
raten = 30000;
rated = 1001;
break;
case 25000:
raten = 25;
rated = 1;
break;
case 30000:
raten = 30;
rated = 1;
break;
case 24000:
raten = 24;
rated = 1;
break;
case 50000:
raten = 50;
rated = 1;
break;
case 59940:
raten = 60000;
rated = 1001;
break;
case 60000:
raten = 60;
rated = 1;
break;
default:
raten = fps1; /* this setting should work, but often doesn't */
rated = 1000;
break;
}
aspectn = 1;
aspectd = 1; /* ffmpeg always uses a 1:1 aspect ratio */
switch(st->codec.pix_fmt) {
case PIX_FMT_YUV420P:
size1 = (width * height * 3) / 2;
if (size != size1)
return -EIO;
picture.data[0] = buf;
picture.data[1] = picture.data[0] + width * height;
picture.data[2] = picture.data[1] + (width * height) / 4;
picture.linesize[0] = width;
picture.linesize[1] = width >> 1;
picture.linesize[2] = width >> 1;
break;
case PIX_FMT_RGB24:
size1 = (width * height * 3);
if (size != size1)
return -EIO;
picture.data[0] = buf;
picture.linesize[0] = width * 3;
break;
default:
return -EIO;
}
/*
This if-statement destroys pipes - I do not see why it is necessary
if (get_frame_filename(filename, sizeof(filename),
img->path, img->img_number) < 0)
return -EIO;
*/
get_frame_filename(filename, sizeof(filename),
img->path, img->img_number);
if (!img->is_pipe) {
pb = &pb1;
if (url_fopen(pb, filename, URL_WRONLY) < 0)
return -EIO;
} else {
pb = &s->pb;
}
switch(img->img_fmt) {
case IMGFMT_PGMYUV:
ret = pgm_save(&picture, width, height, pb, 1);
break;
case IMGFMT_PGM:
ret = pgm_save(&picture, width, height, pb, 0);
break;
case IMGFMT_YUV:
ret = yuv_save(&picture, width, height, filename);
break;
case IMGFMT_PPM:
ret = ppm_save(&picture, width, height, pb);
break;
case IMGFMT_YUV4MPEG:
ret = yuv4mpeg_save(&picture, width, height, pb,
need_stream_header, 1, raten, rated, aspectn, aspectd);
break;
}
if (!img->is_pipe) {
url_fclose(pb);
}
img->img_number++;
return 0;
}
static int img_write_trailer(AVFormatContext *s)
{
return 0;
}
static AVInputFormat pgm_iformat = {
"pgm",
"pgm image format",
sizeof(VideoData),
NULL,
img_read_header,
img_read_packet,
img_read_close,
NULL,
AVFMT_NOFILE | AVFMT_NEEDNUMBER,
.extensions = "pgm",
};
static AVOutputFormat pgm_oformat = {
"pgm",
"pgm image format",
"",
"pgm",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};
static AVInputFormat pgmyuv_iformat = {
"pgmyuv",
"pgm with YUV content image format",
sizeof(VideoData),
NULL, /* no probe */
img_read_header,
img_read_packet,
img_read_close,
NULL,
AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};
static AVOutputFormat pgmyuv_oformat = {
"pgmyuv",
"pgm with YUV content image format",
"",
"pgm",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};
static AVInputFormat ppm_iformat = {
"ppm",
"ppm image format",
sizeof(VideoData),
NULL,
img_read_header,
img_read_packet,
img_read_close,
NULL,
AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RGB24,
.extensions = "ppm",
};
static AVOutputFormat ppm_oformat = {
"ppm",
"ppm image format",
"",
"ppm",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RGB24,
};
static AVInputFormat imgyuv_iformat = {
".Y.U.V",
".Y.U.V format",
sizeof(VideoData),
NULL,
img_read_header,
img_read_packet,
img_read_close,
NULL,
AVFMT_NOFILE | AVFMT_NEEDNUMBER,
.extensions = "Y",
};
static AVOutputFormat imgyuv_oformat = {
".Y.U.V",
".Y.U.V format",
"",
"Y",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};
static AVInputFormat pgmpipe_iformat = {
"pgmpipe",
"PGM pipe format",
sizeof(VideoData),
NULL, /* no probe */
img_read_header,
img_read_packet,
img_read_close,
NULL,
};
static AVOutputFormat pgmpipe_oformat = {
"pgmpipe",
"PGM pipe format",
"",
"pgm",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
};
static AVInputFormat pgmyuvpipe_iformat = {
"pgmyuvpipe",
"PGM YUV pipe format",
sizeof(VideoData),
NULL, /* no probe */
img_read_header,
img_read_packet,
img_read_close,
NULL,
};
static AVOutputFormat pgmyuvpipe_oformat = {
"pgmyuvpipe",
"PGM YUV pipe format",
"",
"pgm",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
};
static AVInputFormat ppmpipe_iformat = {
"ppmpipe",
"PPM pipe format",
sizeof(VideoData),
NULL, /* no probe */
img_read_header,
img_read_packet,
img_read_close,
NULL,
.flags = AVFMT_RGB24,
};
static AVOutputFormat ppmpipe_oformat = {
"ppmpipe",
"PPM pipe format",
"",
"ppm",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
.flags = AVFMT_RGB24,
};
static AVOutputFormat yuv4mpegpipe_oformat = {
"yuv4mpegpipe",
"YUV4MPEG pipe format",
"",
"yuv4mpeg",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
};
int img_init(void)
{
av_register_input_format(&pgm_iformat);
av_register_output_format(&pgm_oformat);
av_register_input_format(&pgmyuv_iformat);
av_register_output_format(&pgmyuv_oformat);
av_register_input_format(&ppm_iformat);
av_register_output_format(&ppm_oformat);
av_register_input_format(&imgyuv_iformat);
av_register_output_format(&imgyuv_oformat);
av_register_input_format(&pgmpipe_iformat);
av_register_output_format(&pgmpipe_oformat);
av_register_input_format(&pgmyuvpipe_iformat);
av_register_output_format(&pgmyuvpipe_oformat);
av_register_input_format(&ppmpipe_iformat);
av_register_output_format(&ppmpipe_oformat);
av_register_output_format(&yuv4mpegpipe_oformat);
return 0;
}
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