/* * YUV4MPEG format * Copyright (c) 2001, 2002, 2003 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 "avformat.h" #define Y4M_MAGIC "YUV4MPEG2" #define Y4M_FRAME_MAGIC "FRAME" #define Y4M_LINE_MAX 256 static int yuv4_write_header(AVFormatContext *s) { AVStream *st; int width, height; int raten, rated, aspectn, aspectd, fps, fps1, n, gcd; char buf[Y4M_LINE_MAX+1]; if (s->nb_streams != 1) return -EIO; st = s->streams[0]; width = st->codec.width; height = st->codec.height; #if 1 //this is identical to the code below for exact fps av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1); #else fps = st->codec.frame_rate; fps1 = (((float)fps / st->codec.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 = st->codec.frame_rate; /* this setting should work, but often doesn't */ rated = st->codec.frame_rate_base; gcd= av_gcd(raten, rated); raten /= gcd; rated /= gcd; break; } #endif aspectn = 1; aspectd = 1; /* ffmpeg always uses a 1:1 aspect ratio */ //FIXME not true anymore /* construct stream header, if this is the first frame */ 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"); return -EIO; } else { put_buffer(&s->pb, buf, strlen(buf)); } return 0; } static int yuv4_write_packet(AVFormatContext *s, int stream_index, uint8_t *buf, int size, int force_pts) { AVStream *st = s->streams[stream_index]; ByteIOContext *pb = &s->pb; AVPicture *picture; int width, height; int i, m; char buf1[20]; uint8_t *ptr, *ptr1, *ptr2; picture = (AVPicture *)buf; /* construct frame header */ m = snprintf(buf1, sizeof(buf1), "%s \n", Y4M_FRAME_MAGIC); put_buffer(pb, buf1, strlen(buf1)); width = st->codec.width; height = st->codec.height; ptr = picture->data[0]; for(i=0;i<height;i++) { put_buffer(pb, ptr, width); ptr += picture->linesize[0]; } 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 yuv4_write_trailer(AVFormatContext *s) { return 0; } AVOutputFormat yuv4mpegpipe_oformat = { "yuv4mpegpipe", "YUV4MPEG pipe format", "", "yuv4mpeg", 0, CODEC_ID_NONE, CODEC_ID_RAWVIDEO, yuv4_write_header, yuv4_write_packet, yuv4_write_trailer, .flags = AVFMT_RAWPICTURE, };