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FFmpeg/libavformat/yuv4mpeg.c
Clément Bœsch 7308439158 lavf: Don't explicitly flush after each written packet in muxers 
Since 596e5d4783, this is not necessary anymore. It also allows to
actually disable the flushing, improving write performance (but
possibly giving worse latency in real-time streaming).

Signed-off-by: Martin Storsjö <martin@martin.st>
2013-09-16 22:17:33 +03:00

611 lines
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/*
* YUV4MPEG format
* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
*
* 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 "libavutil/pixdesc.h"
#include "avformat.h"
#include "internal.h"
#include "libavutil/pixdesc.h"
#define Y4M_MAGIC "YUV4MPEG2"
#define Y4M_FRAME_MAGIC "FRAME"
#define Y4M_LINE_MAX 256
#if CONFIG_YUV4MPEGPIPE_MUXER
static int yuv4_generate_header(AVFormatContext *s, char* buf)
{
AVStream *st;
int width, height;
int raten, rated, aspectn, aspectd, n;
char inter;
const char *colorspace = "";
st = s->streams[0];
width = st->codec->width;
height = st->codec->height;
av_reduce(&raten, &rated, st->codec->time_base.den,
st->codec->time_base.num, (1UL << 31) - 1);
aspectn = st->sample_aspect_ratio.num;
aspectd = st->sample_aspect_ratio.den;
if (aspectn == 0 && aspectd == 1)
aspectd = 0; // 0:0 means unknown
inter = 'p'; /* progressive is the default */
if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame)
inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
if (st->codec->field_order == AV_FIELD_PROGRESSIVE) {
inter = 'p';
} else if (st->codec->field_order == AV_FIELD_TB || st->codec->field_order == AV_FIELD_TT) {
inter = 't';
} else if (st->codec->field_order == AV_FIELD_BT || st->codec->field_order == AV_FIELD_BB) {
inter = 'b';
}
switch (st->codec->pix_fmt) {
case AV_PIX_FMT_GRAY8:
colorspace = " Cmono";
break;
case AV_PIX_FMT_GRAY16:
colorspace = " Cmono16";
break;
case AV_PIX_FMT_YUV411P:
colorspace = " C411 XYSCSS=411";
break;
case AV_PIX_FMT_YUV420P:
switch (st->codec->chroma_sample_location) {
case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;
case AVCHROMA_LOC_LEFT: colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;
default: colorspace = " C420jpeg XYSCSS=420JPEG"; break;
}
break;
case AV_PIX_FMT_YUV422P:
colorspace = " C422 XYSCSS=422";
break;
case AV_PIX_FMT_YUV444P:
colorspace = " C444 XYSCSS=444";
break;
case AV_PIX_FMT_YUV420P9:
colorspace = " C420p9 XYSCSS=420P9";
break;
case AV_PIX_FMT_YUV422P9:
colorspace = " C422p9 XYSCSS=422P9";
break;
case AV_PIX_FMT_YUV444P9:
colorspace = " C444p9 XYSCSS=444P9";
break;
case AV_PIX_FMT_YUV420P10:
colorspace = " C420p10 XYSCSS=420P10";
break;
case AV_PIX_FMT_YUV422P10:
colorspace = " C422p10 XYSCSS=422P10";
break;
case AV_PIX_FMT_YUV444P10:
colorspace = " C444p10 XYSCSS=444P10";
break;
case AV_PIX_FMT_YUV420P12:
colorspace = " C420p12 XYSCSS=420P12";
break;
case AV_PIX_FMT_YUV422P12:
colorspace = " C422p12 XYSCSS=422P12";
break;
case AV_PIX_FMT_YUV444P12:
colorspace = " C444p12 XYSCSS=444P12";
break;
case AV_PIX_FMT_YUV420P14:
colorspace = " C420p14 XYSCSS=420P14";
break;
case AV_PIX_FMT_YUV422P14:
colorspace = " C422p14 XYSCSS=422P14";
break;
case AV_PIX_FMT_YUV444P14:
colorspace = " C444p14 XYSCSS=444P14";
break;
case AV_PIX_FMT_YUV420P16:
colorspace = " C420p16 XYSCSS=420P16";
break;
case AV_PIX_FMT_YUV422P16:
colorspace = " C422p16 XYSCSS=422P16";
break;
case AV_PIX_FMT_YUV444P16:
colorspace = " C444p16 XYSCSS=444P16";
break;
}
/* construct stream header, if this is the first frame */
n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
Y4M_MAGIC, width, height, raten, rated, inter,
aspectn, aspectd, colorspace);
return n;
}
static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
AVIOContext *pb = s->pb;
AVPicture *picture, picture_tmp;
int* first_pkt = s->priv_data;
int width, height, h_chroma_shift, v_chroma_shift;
int i;
char buf2[Y4M_LINE_MAX + 1];
char buf1[20];
uint8_t *ptr, *ptr1, *ptr2;
memcpy(&picture_tmp, pkt->data, sizeof(AVPicture));
picture = &picture_tmp;
/* for the first packet we have to output the header as well */
if (*first_pkt) {
*first_pkt = 0;
if (yuv4_generate_header(s, buf2) < 0) {
av_log(s, AV_LOG_ERROR,
"Error. YUV4MPEG stream header write failed.\n");
return AVERROR(EIO);
} else {
avio_write(pb, buf2, strlen(buf2));
}
}
/* construct frame header */
snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
avio_write(pb, buf1, strlen(buf1));
width = st->codec->width;
height = st->codec->height;
ptr = picture->data[0];
switch (st->codec->pix_fmt) {
case AV_PIX_FMT_GRAY8:
case AV_PIX_FMT_YUV411P:
case AV_PIX_FMT_YUV420P:
case AV_PIX_FMT_YUV422P:
case AV_PIX_FMT_YUV444P:
break;
case AV_PIX_FMT_GRAY16:
case AV_PIX_FMT_YUV420P9:
case AV_PIX_FMT_YUV422P9:
case AV_PIX_FMT_YUV444P9:
case AV_PIX_FMT_YUV420P10:
case AV_PIX_FMT_YUV422P10:
case AV_PIX_FMT_YUV444P10:
case AV_PIX_FMT_YUV420P12:
case AV_PIX_FMT_YUV422P12:
case AV_PIX_FMT_YUV444P12:
case AV_PIX_FMT_YUV420P14:
case AV_PIX_FMT_YUV422P14:
case AV_PIX_FMT_YUV444P14:
case AV_PIX_FMT_YUV420P16:
case AV_PIX_FMT_YUV422P16:
case AV_PIX_FMT_YUV444P16:
width *= 2;
break;
default:
av_log(s, AV_LOG_ERROR, "The pixel format '%s' is not supported.\n",
av_get_pix_fmt_name(st->codec->pix_fmt));
return AVERROR(EINVAL);
}
for (i = 0; i < height; i++) {
avio_write(pb, ptr, width);
ptr += picture->linesize[0];
}
if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8 &&
st->codec->pix_fmt != AV_PIX_FMT_GRAY16) {
// Adjust for smaller Cb and Cr planes
av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
&v_chroma_shift);
width = FF_CEIL_RSHIFT(width, h_chroma_shift);
height = FF_CEIL_RSHIFT(height, v_chroma_shift);
ptr1 = picture->data[1];
ptr2 = picture->data[2];
for (i = 0; i < height; i++) { /* Cb */
avio_write(pb, ptr1, width);
ptr1 += picture->linesize[1];
}
for (i = 0; i < height; i++) { /* Cr */
avio_write(pb, ptr2, width);
ptr2 += picture->linesize[2];
}
}
return 0;
}
static int yuv4_write_header(AVFormatContext *s)
{
int *first_pkt = s->priv_data;
if (s->nb_streams != 1)
return AVERROR(EIO);
if (s->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
av_log(s, AV_LOG_ERROR, "ERROR: Only rawvideo supported.\n");
return AVERROR_INVALIDDATA;
}
switch (s->streams[0]->codec->pix_fmt) {
case AV_PIX_FMT_YUV411P:
av_log(s, AV_LOG_WARNING, "Warning: generating rarely used 4:1:1 YUV "
"stream, some mjpegtools might not work.\n");
break;
case AV_PIX_FMT_GRAY8:
case AV_PIX_FMT_GRAY16:
case AV_PIX_FMT_YUV420P:
case AV_PIX_FMT_YUV422P:
case AV_PIX_FMT_YUV444P:
break;
case AV_PIX_FMT_YUV420P9:
case AV_PIX_FMT_YUV422P9:
case AV_PIX_FMT_YUV444P9:
case AV_PIX_FMT_YUV420P10:
case AV_PIX_FMT_YUV422P10:
case AV_PIX_FMT_YUV444P10:
case AV_PIX_FMT_YUV420P12:
case AV_PIX_FMT_YUV422P12:
case AV_PIX_FMT_YUV444P12:
case AV_PIX_FMT_YUV420P14:
case AV_PIX_FMT_YUV422P14:
case AV_PIX_FMT_YUV444P14:
case AV_PIX_FMT_YUV420P16:
case AV_PIX_FMT_YUV422P16:
case AV_PIX_FMT_YUV444P16:
if (s->streams[0]->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL) {
av_log(s, AV_LOG_ERROR, "'%s' is not a official yuv4mpegpipe pixel format. "
"Use '-strict -1' to encode to this pixel format.\n",
av_get_pix_fmt_name(s->streams[0]->codec->pix_fmt));
return AVERROR(EINVAL);
}
av_log(s, AV_LOG_WARNING, "Warning: generating non standard YUV stream. "
"Mjpegtools will not work.\n");
break;
default:
av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg can only handle "
"yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. "
"And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, "
"yuv444p10, yuv422p10, yuv420p10, "
"yuv444p12, yuv422p12, yuv420p12, "
"yuv444p14, yuv422p14, yuv420p14, "
"yuv444p16, yuv422p16, yuv420p16 "
"and gray16 pixel formats. "
"Use -pix_fmt to select one.\n");
return AVERROR(EIO);
}
*first_pkt = 1;
return 0;
}
AVOutputFormat ff_yuv4mpegpipe_muxer = {
.name = "yuv4mpegpipe",
.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
.extensions = "y4m",
.priv_data_size = sizeof(int),
.audio_codec = AV_CODEC_ID_NONE,
.video_codec = AV_CODEC_ID_RAWVIDEO,
.write_header = yuv4_write_header,
.write_packet = yuv4_write_packet,
.flags = AVFMT_RAWPICTURE,
};
#endif
/* Header size increased to allow room for optional flags */
#define MAX_YUV4_HEADER 80
#define MAX_FRAME_HEADER 80
static int yuv4_read_header(AVFormatContext *s)
{
char header[MAX_YUV4_HEADER + 10]; // Include headroom for
// the longest option
char *tokstart, *tokend, *header_end, interlaced = '?';
int i;
AVIOContext *pb = s->pb;
int width = -1, height = -1, raten = 0,
rated = 0, aspectn = 0, aspectd = 0;
enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
AVStream *st;
for (i = 0; i < MAX_YUV4_HEADER; i++) {
header[i] = avio_r8(pb);
if (header[i] == '\n') {
header[i + 1] = 0x20; // Add a space after last option.
// Makes parsing "444" vs "444alpha" easier.
header[i + 2] = 0;
break;
}
}
if (i == MAX_YUV4_HEADER)
return -1;
if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
return -1;
header_end = &header[i + 1]; // Include space
for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
tokstart < header_end; tokstart++) {
if (*tokstart == 0x20)
continue;
switch (*tokstart++) {
case 'W': // Width. Required.
width = strtol(tokstart, &tokend, 10);
tokstart = tokend;
break;
case 'H': // Height. Required.
height = strtol(tokstart, &tokend, 10);
tokstart = tokend;
break;
case 'C': // Color space
if (strncmp("420jpeg", tokstart, 7) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P;
chroma_sample_location = AVCHROMA_LOC_CENTER;
} else if (strncmp("420mpeg2", tokstart, 8) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P;
chroma_sample_location = AVCHROMA_LOC_LEFT;
} else if (strncmp("420paldv", tokstart, 8) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P;
chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
} else if (strncmp("420p16", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P16;
} else if (strncmp("422p16", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV422P16;
} else if (strncmp("444p16", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV444P16;
} else if (strncmp("420p14", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P14;
} else if (strncmp("422p14", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV422P14;
} else if (strncmp("444p14", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV444P14;
} else if (strncmp("420p12", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P12;
} else if (strncmp("422p12", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV422P12;
} else if (strncmp("444p12", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV444P12;
} else if (strncmp("420p10", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P10;
} else if (strncmp("422p10", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV422P10;
} else if (strncmp("444p10", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_YUV444P10;
} else if (strncmp("420p9", tokstart, 5) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P9;
} else if (strncmp("422p9", tokstart, 5) == 0) {
pix_fmt = AV_PIX_FMT_YUV422P9;
} else if (strncmp("444p9", tokstart, 5) == 0) {
pix_fmt = AV_PIX_FMT_YUV444P9;
} else if (strncmp("420", tokstart, 3) == 0) {
pix_fmt = AV_PIX_FMT_YUV420P;
chroma_sample_location = AVCHROMA_LOC_CENTER;
} else if (strncmp("411", tokstart, 3) == 0) {
pix_fmt = AV_PIX_FMT_YUV411P;
} else if (strncmp("422", tokstart, 3) == 0) {
pix_fmt = AV_PIX_FMT_YUV422P;
} else if (strncmp("444alpha", tokstart, 8) == 0 ) {
av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
"YUV4MPEG stream.\n");
return -1;
} else if (strncmp("444", tokstart, 3) == 0) {
pix_fmt = AV_PIX_FMT_YUV444P;
} else if (strncmp("mono16", tokstart, 6) == 0) {
pix_fmt = AV_PIX_FMT_GRAY16;
} else if (strncmp("mono", tokstart, 4) == 0) {
pix_fmt = AV_PIX_FMT_GRAY8;
} else {
av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
"pixel format.\n");
return -1;
}
while (tokstart < header_end && *tokstart != 0x20)
tokstart++;
break;
case 'I': // Interlace type
interlaced = *tokstart++;
break;
case 'F': // Frame rate
sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
while (tokstart < header_end && *tokstart != 0x20)
tokstart++;
break;
case 'A': // Pixel aspect
sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
while (tokstart < header_end && *tokstart != 0x20)
tokstart++;
break;
case 'X': // Vendor extensions
if (strncmp("YSCSS=", tokstart, 6) == 0) {
// Older nonstandard pixel format representation
tokstart += 6;
if (strncmp("420JPEG", tokstart, 7) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV420P;
else if (strncmp("420MPEG2", tokstart, 8) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV420P;
else if (strncmp("420PALDV", tokstart, 8) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV420P;
else if (strncmp("420P9", tokstart, 5) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV420P9;
else if (strncmp("422P9", tokstart, 5) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV422P9;
else if (strncmp("444P9", tokstart, 5) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV444P9;
else if (strncmp("420P10", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV420P10;
else if (strncmp("422P10", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV422P10;
else if (strncmp("444P10", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV444P10;
else if (strncmp("420P12", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV420P12;
else if (strncmp("422P12", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV422P12;
else if (strncmp("444P12", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV444P12;
else if (strncmp("420P14", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV420P14;
else if (strncmp("422P14", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV422P14;
else if (strncmp("444P14", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV444P14;
else if (strncmp("420P16", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV420P16;
else if (strncmp("422P16", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV422P16;
else if (strncmp("444P16", tokstart, 6) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV444P16;
else if (strncmp("411", tokstart, 3) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV411P;
else if (strncmp("422", tokstart, 3) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV422P;
else if (strncmp("444", tokstart, 3) == 0)
alt_pix_fmt = AV_PIX_FMT_YUV444P;
}
while (tokstart < header_end && *tokstart != 0x20)
tokstart++;
break;
}
}
if (width == -1 || height == -1) {
av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
return -1;
}
if (pix_fmt == AV_PIX_FMT_NONE) {
if (alt_pix_fmt == AV_PIX_FMT_NONE)
pix_fmt = AV_PIX_FMT_YUV420P;
else
pix_fmt = alt_pix_fmt;
}
if (raten <= 0 || rated <= 0) {
// Frame rate unknown
raten = 25;
rated = 1;
}
if (aspectn == 0 && aspectd == 0) {
// Pixel aspect unknown
aspectd = 1;
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->width = width;
st->codec->height = height;
av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
avpriv_set_pts_info(st, 64, rated, raten);
st->codec->pix_fmt = pix_fmt;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
st->codec->chroma_sample_location = chroma_sample_location;
switch (interlaced){
case 'p':
st->codec->field_order = AV_FIELD_PROGRESSIVE;
break;
case 't':
st->codec->field_order = AV_FIELD_TB;
break;
case 'b':
st->codec->field_order = AV_FIELD_BT;
break;
case 'm':
av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
"interlaced and non-interlaced frames.\n");
case '?':
st->codec->field_order = AV_FIELD_UNKNOWN;
break;
default:
av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
return AVERROR(EINVAL);
}
return 0;
}
static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int i;
char header[MAX_FRAME_HEADER+1];
int packet_size, width, height, ret;
AVStream *st = s->streams[0];
for (i = 0; i < MAX_FRAME_HEADER; i++) {
header[i] = avio_r8(s->pb);
if (header[i] == '\n') {
header[i + 1] = 0;
break;
}
}
if (s->pb->error)
return s->pb->error;
else if (s->pb->eof_reached)
return AVERROR_EOF;
else if (i == MAX_FRAME_HEADER)
return AVERROR_INVALIDDATA;
if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
return AVERROR_INVALIDDATA;
width = st->codec->width;
height = st->codec->height;
packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
if (packet_size < 0)
return packet_size;
ret = av_get_packet(s->pb, pkt, packet_size);
if (ret < 0)
return ret;
else if (ret != packet_size)
return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
pkt->stream_index = 0;
return 0;
}
static int yuv4_probe(AVProbeData *pd)
{
/* check file header */
if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
return AVPROBE_SCORE_MAX;
else
return 0;
}
#if CONFIG_YUV4MPEGPIPE_DEMUXER
AVInputFormat ff_yuv4mpegpipe_demuxer = {
.name = "yuv4mpegpipe",
.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
.read_probe = yuv4_probe,
.read_header = yuv4_read_header,
.read_packet = yuv4_read_packet,
.extensions = "y4m",
};
#endif
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