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ffmpeg / libavformat / yuv4mpeg.c @ 20f269dc

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1 0b9fb89d Fabrice Bellard
/*
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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, n;
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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;
38 14bea432 Michael Niedermayer
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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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    {
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        int gcd, fps, fps1;
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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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        }
92 0b9fb89d Fabrice Bellard
    }
93 14bea432 Michael Niedermayer
#endif
94 0b9fb89d Fabrice Bellard
    
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    aspectn = 1;
96 14bea432 Michael Niedermayer
    aspectd = 1;        /* ffmpeg always uses a 1:1 aspect ratio */ //FIXME not true anymore
97 0b9fb89d Fabrice Bellard
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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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                             const uint8_t *buf, int size, int64_t 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];
124 0c1a9eda Zdenek Kabelac
    uint8_t *ptr, *ptr1, *ptr2;
125 0b9fb89d Fabrice Bellard
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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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176 d9a916e2 Charles Yates
/* Header size increased to allow room for optional flags */
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#define MAX_YUV4_HEADER 80
178 2864dfd5 D Richard Felker III
#define MAX_FRAME_HEADER 10
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static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    char header[MAX_YUV4_HEADER+1];
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    int i;
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    ByteIOContext *pb = &s->pb;
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    int width, height, raten, rated, aspectn, aspectd;
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    char lacing;
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    AVStream *st;
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    for (i=0; i<MAX_YUV4_HEADER; i++) {
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        header[i] = get_byte(pb);
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        if (header[i] == '\n') {
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            header[i+1] = 0;
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            break;
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        }
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    }
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    if (i == MAX_YUV4_HEADER) return -1;
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    if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
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    sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
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           &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
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    st = av_new_stream(s, 0);
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    st = s->streams[0];
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    st->codec.width = width;
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    st->codec.height = height;
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    av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
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    st->codec.frame_rate = raten;
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    st->codec.frame_rate_base = rated;
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    st->codec.pix_fmt = PIX_FMT_YUV420P;
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    st->codec.codec_type = CODEC_TYPE_VIDEO;
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    st->codec.codec_id = CODEC_ID_RAWVIDEO;
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    return 0;
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}
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static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    int i;
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    char header[MAX_FRAME_HEADER+1];
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    int packet_size, ret, width, height;
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    AVStream *st = s->streams[0];
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    for (i=0; i<MAX_FRAME_HEADER; i++) {
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        header[i] = get_byte(&s->pb);
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        if (header[i] == '\n') {
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            header[i+1] = 0;
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            break;
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        }
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    }
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    if (i == MAX_FRAME_HEADER) return -1;
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    if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
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    width = st->codec.width;
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    height = st->codec.height;
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    packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
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    if (packet_size < 0)
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        av_abort();
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    if (av_new_packet(pkt, packet_size) < 0)
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        return -EIO;
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    pkt->stream_index = 0;
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    ret = get_buffer(&s->pb, pkt->data, pkt->size);
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    if (ret != pkt->size) {
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        av_free_packet(pkt);
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        return -EIO;
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    } else {
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        return 0;
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    }
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}
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static int yuv4_read_close(AVFormatContext *s)
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{
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    return 0;
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}
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AVInputFormat yuv4mpegpipe_iformat = {
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    "yuv4mpegpipe",
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    "YUV4MPEG pipe format",
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    0,
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    NULL,
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    yuv4_read_header,
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    yuv4_read_packet,
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    yuv4_read_close,
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    .extensions = "yuv4mpeg"
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};
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int yuv4mpeg_init(void)
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{
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    av_register_input_format(&yuv4mpegpipe_iformat);
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    av_register_output_format(&yuv4mpegpipe_oformat);
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    return 0;
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}