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ffmpeg / libavformat / yuv4mpeg.c @ 71e445fc

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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 file is part of FFmpeg.
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 *
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 * FFmpeg 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 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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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struct frame_attributes {
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    int interlaced_frame;
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    int top_field_first;
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};
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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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    const char *colorspace = "";
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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->time_base.den, st->codec->time_base.num, (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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    if ( aspectn == 0 && aspectd == 1 ) aspectd = 0;  // 0:0 means unknown
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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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    switch(st->codec->pix_fmt) {
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    case PIX_FMT_GRAY8:
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        colorspace = " Cmono";
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        break;
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    case PIX_FMT_YUV411P:
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        colorspace = " C411 XYSCSS=411";
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        break;
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    case PIX_FMT_YUV420P:
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        colorspace = (st->codec->codec_id == CODEC_ID_DVVIDEO)?" C420paldv XYSCSS=420PALDV":" C420mpeg2 XYSCSS=420MPEG2";
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        break;
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    case PIX_FMT_YUV422P:
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        colorspace = " C422 XYSCSS=422";
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        break;
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    case PIX_FMT_YUV444P:
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        colorspace = " C444 XYSCSS=444";
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        break;
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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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                 colorspace);
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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, h_chroma_shift, v_chroma_shift;
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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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    if (st->codec->pix_fmt != PIX_FMT_GRAY8){
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    // Adjust for smaller Cb and Cr planes
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    avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, &v_chroma_shift);
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    width >>= h_chroma_shift;
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    height >>= v_chroma_shift;
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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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    }
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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 rarely used 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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             (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
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             (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
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             (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
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        av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, yuv422p, yuv420p, yuv411p and gray pixel formats. 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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#ifdef CONFIG_YUV4MPEGPIPE_MUXER
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AVOutputFormat yuv4mpegpipe_muxer = {
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    "yuv4mpegpipe",
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    "YUV4MPEG pipe format",
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    "",
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    "y4m",
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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
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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 80
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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+10];  // Include headroom for the longest option
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    char *tokstart,*tokend,*header_end;
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    int i;
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    ByteIOContext *pb = &s->pb;
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    int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
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    enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
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    AVStream *st;
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    struct frame_attributes *s1 = s->priv_data;
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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] = 0x20;  // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
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            header[i+2] = 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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    s1->interlaced_frame = 0;
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    s1->top_field_first = 0;
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    header_end = &header[i+1]; // Include space
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    for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
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        if (*tokstart==0x20) continue;
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        switch (*tokstart++) {
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        case 'W': // Width. Required.
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            width = strtol(tokstart, &tokend, 10);
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            tokstart=tokend;
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            break;
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        case 'H': // Height. Required.
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            height = strtol(tokstart, &tokend, 10);
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            tokstart=tokend;
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            break;
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        case 'C': // Color space
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            if (strncmp("420jpeg",tokstart,7)==0)
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                pix_fmt = PIX_FMT_YUV420P;
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            else if (strncmp("420mpeg2",tokstart,8)==0)
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                pix_fmt = PIX_FMT_YUV420P;
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            else if (strncmp("420paldv", tokstart, 8)==0)
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                pix_fmt = PIX_FMT_YUV420P;
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            else if (strncmp("411", tokstart, 3)==0)
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                pix_fmt = PIX_FMT_YUV411P;
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            else if (strncmp("422", tokstart, 3)==0)
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                pix_fmt = PIX_FMT_YUV422P;
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            else if (strncmp("444alpha", tokstart, 8)==0) {
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                av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
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                return -1;
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            } else if (strncmp("444", tokstart, 3)==0)
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                pix_fmt = PIX_FMT_YUV444P;
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            else if (strncmp("mono",tokstart, 4)==0) {
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                pix_fmt = PIX_FMT_GRAY8;
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            } else {
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                av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
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                return -1;
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            }
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            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
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            break;
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        case 'I': // Interlace type
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            switch (*tokstart++){
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            case '?':
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                break;
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            case 'p':
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                s1->interlaced_frame=0;
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                break;
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            case 't':
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                s1->interlaced_frame=1;
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                s1->top_field_first=1;
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                break;
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            case 'b':
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                s1->interlaced_frame=1;
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                s1->top_field_first=0;
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                break;
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            case 'm':
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                av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
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                return -1;
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            default:
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                av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
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                return -1;
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            }
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            break;
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        case 'F': // Frame rate
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            sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
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            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
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            break;
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        case 'A': // Pixel aspect
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            sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
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            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
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            break;
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        case 'X': // Vendor extensions
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            if (strncmp("YSCSS=",tokstart,6)==0) {
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                // Older nonstandard pixel format representation
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                tokstart+=6;
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                if (strncmp("420JPEG",tokstart,7)==0)
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                    alt_pix_fmt=PIX_FMT_YUV420P;
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                else if (strncmp("420MPEG2",tokstart,8)==0)
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                    alt_pix_fmt=PIX_FMT_YUV420P;
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                else if (strncmp("420PALDV",tokstart,8)==0)
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                    alt_pix_fmt=PIX_FMT_YUV420P;
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                else if (strncmp("411",tokstart,3)==0)
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                    alt_pix_fmt=PIX_FMT_YUV411P;
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                else if (strncmp("422",tokstart,3)==0)
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                    alt_pix_fmt=PIX_FMT_YUV422P;
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                else if (strncmp("444",tokstart,3)==0)
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                    alt_pix_fmt=PIX_FMT_YUV444P;
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            }
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            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
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            break;
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        }
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    }
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    if ((width == -1) || (height == -1)) {
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        av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
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        return -1;
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    }
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    if (pix_fmt == PIX_FMT_NONE) {
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        if (alt_pix_fmt == PIX_FMT_NONE)
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            pix_fmt = PIX_FMT_YUV420P;
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        else
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            pix_fmt = alt_pix_fmt;
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    }
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    if (raten == 0 && rated == 0) {
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        // Frame rate unknown
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        raten = 25;
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        rated = 1;
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    }
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    if (aspectn == 0 && aspectd == 0) {
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        // Pixel aspect unknown
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        aspectd = 1;
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    }
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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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    av_set_pts_info(st, 64, rated, raten);
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    st->codec->pix_fmt = pix_fmt;
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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, width, height;
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    AVStream *st = s->streams[0];
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    struct frame_attributes *s1 = s->priv_data;
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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;
360
    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)
367
        return -1;
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    if (av_get_packet(&s->pb, pkt, packet_size) != packet_size)
370
        return AVERROR_IO;
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    if (s->streams[0]->codec->coded_frame) {
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        s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
374
        s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
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    }
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377
    pkt->stream_index = 0;
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    return 0;
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}
380

    
381
static int yuv4_read_close(AVFormatContext *s)
382
{
383
    return 0;
384
}
385

    
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static int yuv4_probe(AVProbeData *pd)
387
{
388
    /* check file header */
389
    if (pd->buf_size <= sizeof(Y4M_MAGIC))
390
        return 0;
391
    if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
392
        return AVPROBE_SCORE_MAX;
393
    else
394
        return 0;
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}
396

    
397
#ifdef CONFIG_YUV4MPEGPIPE_DEMUXER
398
AVInputFormat yuv4mpegpipe_demuxer = {
399
    "yuv4mpegpipe",
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    "YUV4MPEG pipe format",
401
    sizeof(struct frame_attributes),
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    yuv4_probe,
403
    yuv4_read_header,
404
    yuv4_read_packet,
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    yuv4_read_close,
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    .extensions = "y4m"
407
};
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#endif