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FFmpeg/libavformat/yuv4mpegenc.c
Lou Logan 06eef96b69 fix some a/an typos 
Signed-off-by: Lou Logan <lou@lrcd.com>
2016-03-28 14:13:17 -08:00

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/*
* YUV4MPEG muxer
* 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 "yuv4mpeg.h"
#define Y4M_LINE_MAX 256
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;
// TODO: should be avg_frame_rate
av_reduce(&raten, &rated, st->time_base.den,
st->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
switch (st->codec->field_order) {
case AV_FIELD_TB:
case AV_FIELD_TT: inter = 't'; break;
case AV_FIELD_BT:
case AV_FIELD_BB: inter = 'b'; break;
default: inter = 'p'; break;
}
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;
AVFrame *frame;
int* first_pkt = s->priv_data;
int width, height, h_chroma_shift, v_chroma_shift;
int i;
char buf2[Y4M_LINE_MAX + 1];
uint8_t *ptr, *ptr1, *ptr2;
frame = (AVFrame *)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 */
avio_printf(s->pb, "%s\n", Y4M_FRAME_MAGIC);
width = st->codec->width;
height = st->codec->height;
ptr = frame->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 += frame->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);
// Shift right, rounding up
width = AV_CEIL_RSHIFT(width, h_chroma_shift);
height = AV_CEIL_RSHIFT(height, v_chroma_shift);
ptr1 = frame->data[1];
ptr2 = frame->data[2];
for (i = 0; i < height; i++) { /* Cb */
avio_write(pb, ptr1, width);
ptr1 += frame->linesize[1];
}
for (i = 0; i < height; i++) { /* Cr */
avio_write(pb, ptr2, width);
ptr2 += frame->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_WRAPPED_AVFRAME) {
av_log(s, AV_LOG_ERROR, "ERROR: Codec not 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->strict_std_compliance >= FF_COMPLIANCE_NORMAL) {
av_log(s, AV_LOG_ERROR, "'%s' is not an 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_WRAPPED_AVFRAME,
.write_header = yuv4_write_header,
.write_packet = yuv4_write_packet,
};
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