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ffmpeg / libavformat / yuv4mpeg.c @ 27d5f18f

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/*
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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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#ifdef CONFIG_ENCODERS
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static int yuv4_generate_header(AVFormatContext *s, char* buf)
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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 inter;
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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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    av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
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    aspectn = st->codec.sample_aspect_ratio.num;
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    aspectd = st->codec.sample_aspect_ratio.den;
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    inter = 'p'; /* progressive is the default */
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    if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) {
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        inter = st->codec.coded_frame->top_field_first ? 't' : 'b';
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    }
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    /* construct stream header, if this is the first frame */
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    n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\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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                 inter,
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                 aspectn, aspectd,
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                 (st->codec.pix_fmt == PIX_FMT_YUV411P) ? " C411 XYSCSS=411" : " C420mpeg2 XYSCSS=420MPEG2");
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    return n;
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}
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static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    AVStream *st = s->streams[pkt->stream_index];
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    ByteIOContext *pb = &s->pb;
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    AVPicture *picture;
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    int* first_pkt = s->priv_data;
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    int width, height;
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    int i, m;
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    char buf2[Y4M_LINE_MAX+1];
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    char buf1[20];
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    uint8_t *ptr, *ptr1, *ptr2;
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    picture = (AVPicture *)pkt->data;
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    /* for the first packet we have to output the header as well */
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    if (*first_pkt) {
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        *first_pkt = 0;
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        if (yuv4_generate_header(s, buf2) < 0) {
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            av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
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            return AVERROR_IO;
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        } else {
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            put_buffer(pb, buf2, strlen(buf2)); 
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        }
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    }
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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_header(AVFormatContext *s)
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{
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    int* first_pkt = s->priv_data;
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    if (s->nb_streams != 1)
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        return AVERROR_IO;
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    if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) {
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        av_log(s, AV_LOG_ERROR, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n");
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    } 
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    else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) {
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        av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n");
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        return AVERROR_IO;
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    }
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    *first_pkt = 1;
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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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    sizeof(int),
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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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#endif //CONFIG_ENCODERS
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/* Header size increased to allow room for optional flags */
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#define MAX_YUV4_HEADER 80
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#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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    st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd};
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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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        return -1;
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    if (av_new_packet(pkt, packet_size) < 0)
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        return AVERROR_IO;
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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 AVERROR_IO;
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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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#ifdef CONFIG_ENCODERS
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    av_register_output_format(&yuv4mpegpipe_oformat);
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#endif //CONFIG_ENCODERS
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    return 0;
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}
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