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FFmpeg/libavformat/yuv4mpeg.c
Mike Melanson b864b38397 yuv4mpeg: allow YUV4MPEG2 demuxer to recognize 'C420' colorspace. 
Current demuxer recognizes several colorspace formats that begin with 'C420'
but does not yet recognize plain 'C420'. GStreamer's y4menc component
generates .y4m files with a 'C420' colorspace. This new comparison is
placed after the other 'C420' checks so that it doesn't interfere with
them.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
2012-01-30 07:30:21 +01:00

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/*
* YUV4MPEG format
* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
*
* 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 "internal.h"
#define Y4M_MAGIC "YUV4MPEG2"
#define Y4M_FRAME_MAGIC "FRAME"
#define Y4M_LINE_MAX 256
struct frame_attributes {
int interlaced_frame;
int top_field_first;
};
#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';
switch (st->codec->pix_fmt) {
case PIX_FMT_GRAY8:
colorspace = " Cmono";
break;
case PIX_FMT_YUV411P:
colorspace = " C411 XYSCSS=411";
break;
case 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 PIX_FMT_YUV422P:
colorspace = " C422 XYSCSS=422";
break;
case PIX_FMT_YUV444P:
colorspace = " C444 XYSCSS=444";
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;
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;
picture = (AVPicture *)pkt->data;
/* 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];
for (i = 0; i < height; i++) {
avio_write(pb, ptr, width);
ptr += picture->linesize[0];
}
if (st->codec->pix_fmt != PIX_FMT_GRAY8) {
// Adjust for smaller Cb and Cr planes
avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
&v_chroma_shift);
width >>= h_chroma_shift;
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];
}
}
avio_flush(pb);
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->pix_fmt == PIX_FMT_YUV411P) {
av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV "
"stream, some mjpegtools might not work.\n");
} else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
(s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
(s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
(s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, "
"yuv422p, yuv420p, yuv411p and gray 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 format"),
.mime_type = "",
.extensions = "y4m",
.priv_data_size = sizeof(int),
.audio_codec = CODEC_ID_NONE,
.video_codec = 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;
int i;
AVIOContext *pb = s->pb;
int width = -1, height = -1, raten = 0,
rated = 0, aspectn = 0, aspectd = 0;
enum PixelFormat pix_fmt = PIX_FMT_NONE, alt_pix_fmt = PIX_FMT_NONE;
enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
AVStream *st;
struct frame_attributes *s1 = s->priv_data;
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;
s1->interlaced_frame = 0;
s1->top_field_first = 0;
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 = PIX_FMT_YUV420P;
chroma_sample_location = AVCHROMA_LOC_CENTER;
} else if (strncmp("420mpeg2", tokstart, 8) == 0) {
pix_fmt = PIX_FMT_YUV420P;
chroma_sample_location = AVCHROMA_LOC_LEFT;
} else if (strncmp("420paldv", tokstart, 8) == 0) {
pix_fmt = PIX_FMT_YUV420P;
chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
} else if (strncmp("420", tokstart, 3) == 0) {
pix_fmt = PIX_FMT_YUV420P;
chroma_sample_location = AVCHROMA_LOC_CENTER;
} else if (strncmp("411", tokstart, 3) == 0)
pix_fmt = PIX_FMT_YUV411P;
else if (strncmp("422", tokstart, 3) == 0)
pix_fmt = 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 = PIX_FMT_YUV444P;
else if (strncmp("mono", tokstart, 4) == 0) {
pix_fmt = 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
switch (*tokstart++){
case '?':
break;
case 'p':
s1->interlaced_frame = 0;
break;
case 't':
s1->interlaced_frame = 1;
s1->top_field_first = 1;
break;
case 'b':
s1->interlaced_frame = 1;
s1->top_field_first = 0;
break;
case 'm':
av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
"interlaced and non-interlaced frames.\n");
return -1;
default:
av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
return -1;
}
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 = PIX_FMT_YUV420P;
else if (strncmp("420MPEG2", tokstart, 8) == 0)
alt_pix_fmt = PIX_FMT_YUV420P;
else if (strncmp("420PALDV", tokstart, 8) == 0)
alt_pix_fmt = PIX_FMT_YUV420P;
else if (strncmp("411", tokstart, 3) == 0)
alt_pix_fmt = PIX_FMT_YUV411P;
else if (strncmp("422", tokstart, 3) == 0)
alt_pix_fmt = PIX_FMT_YUV422P;
else if (strncmp("444", tokstart, 3) == 0)
alt_pix_fmt = 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 == PIX_FMT_NONE) {
if (alt_pix_fmt == PIX_FMT_NONE)
pix_fmt = 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 = CODEC_ID_RAWVIDEO;
st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
st->codec->chroma_sample_location = chroma_sample_location;
return 0;
}
static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int i;
char header[MAX_FRAME_HEADER+1];
int packet_size, width, height;
AVStream *st = s->streams[0];
struct frame_attributes *s1 = s->priv_data;
for (i = 0; i < MAX_FRAME_HEADER; i++) {
header[i] = avio_r8(s->pb);
if (header[i] == '\n') {
header[i + 1] = 0;
break;
}
}
if (i == MAX_FRAME_HEADER)
return -1;
if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
return -1;
width = st->codec->width;
height = st->codec->height;
packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
if (packet_size < 0)
return -1;
if (av_get_packet(s->pb, pkt, packet_size) != packet_size)
return AVERROR(EIO);
if (st->codec->coded_frame) {
st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
st->codec->coded_frame->top_field_first = s1->top_field_first;
}
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 format"),
.priv_data_size = sizeof(struct frame_attributes),
.read_probe = yuv4_probe,
.read_header = yuv4_read_header,
.read_packet = yuv4_read_packet,
.extensions = "y4m"
};
#endif
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