mirror of
https://git.videolan.org/git/ffmpeg.git
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173 lines
4.5 KiB
C
173 lines
4.5 KiB
C
/*
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* YUV4MPEG format
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* Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#define Y4M_MAGIC "YUV4MPEG2"
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#define Y4M_FRAME_MAGIC "FRAME"
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#define Y4M_LINE_MAX 256
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static int yuv4_write_header(AVFormatContext *s)
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{
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AVStream *st;
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int width, height;
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int raten, rated, aspectn, aspectd, fps, fps1, n, gcd;
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char buf[Y4M_LINE_MAX+1];
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if (s->nb_streams != 1)
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return -EIO;
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st = s->streams[0];
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width = st->codec.width;
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height = st->codec.height;
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#if 1
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//this is identical to the code below for exact fps
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av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
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#else
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fps = st->codec.frame_rate;
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fps1 = (((float)fps / st->codec.frame_rate_base) * 1000);
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/* Sorry about this messy code, but mpeg2enc is very picky about
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* the framerates it accepts. */
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switch(fps1) {
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case 23976:
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raten = 24000; /* turn the framerate into a ratio */
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rated = 1001;
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break;
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case 29970:
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raten = 30000;
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rated = 1001;
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break;
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case 25000:
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raten = 25;
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rated = 1;
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break;
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case 30000:
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raten = 30;
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rated = 1;
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break;
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case 24000:
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raten = 24;
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rated = 1;
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break;
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case 50000:
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raten = 50;
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rated = 1;
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break;
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case 59940:
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raten = 60000;
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rated = 1001;
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break;
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case 60000:
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raten = 60;
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rated = 1;
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break;
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default:
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raten = st->codec.frame_rate; /* this setting should work, but often doesn't */
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rated = st->codec.frame_rate_base;
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gcd= av_gcd(raten, rated);
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raten /= gcd;
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rated /= gcd;
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break;
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}
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#endif
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aspectn = 1;
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aspectd = 1; /* ffmpeg always uses a 1:1 aspect ratio */ //FIXME not true anymore
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/* construct stream header, if this is the first frame */
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n = snprintf(buf, sizeof(buf), "%s W%d H%d F%d:%d I%s A%d:%d\n",
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Y4M_MAGIC,
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width,
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height,
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raten, rated,
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"p", /* ffmpeg seems to only output progressive video */
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aspectn, aspectd);
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if (n < 0) {
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fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
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return -EIO;
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} else {
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put_buffer(&s->pb, buf, strlen(buf));
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}
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return 0;
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}
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static int yuv4_write_packet(AVFormatContext *s, int stream_index,
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uint8_t *buf, int size, int force_pts)
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{
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AVStream *st = s->streams[stream_index];
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ByteIOContext *pb = &s->pb;
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AVPicture *picture;
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int width, height;
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int i, m;
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char buf1[20];
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uint8_t *ptr, *ptr1, *ptr2;
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picture = (AVPicture *)buf;
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/* construct frame header */
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m = snprintf(buf1, sizeof(buf1), "%s \n", Y4M_FRAME_MAGIC);
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put_buffer(pb, buf1, strlen(buf1));
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width = st->codec.width;
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height = st->codec.height;
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ptr = picture->data[0];
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for(i=0;i<height;i++) {
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put_buffer(pb, ptr, width);
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ptr += picture->linesize[0];
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}
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height >>= 1;
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width >>= 1;
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ptr1 = picture->data[1];
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ptr2 = picture->data[2];
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for(i=0;i<height;i++) { /* Cb */
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put_buffer(pb, ptr1, width);
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ptr1 += picture->linesize[1];
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}
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for(i=0;i<height;i++) { /* Cr */
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put_buffer(pb, ptr2, width);
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ptr2 += picture->linesize[2];
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}
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put_flush_packet(pb);
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return 0;
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}
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static int yuv4_write_trailer(AVFormatContext *s)
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{
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return 0;
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}
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AVOutputFormat yuv4mpegpipe_oformat = {
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"yuv4mpegpipe",
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"YUV4MPEG pipe format",
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"",
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"yuv4mpeg",
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0,
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CODEC_ID_NONE,
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CODEC_ID_RAWVIDEO,
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yuv4_write_header,
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yuv4_write_packet,
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yuv4_write_trailer,
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.flags = AVFMT_RAWPICTURE,
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};
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