libavformat/yuv4mpeg.c

   1 /*
   2  * YUV4MPEG format
   3  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include "avformat.h"
  20
  21 #define Y4M_MAGIC "YUV4MPEG2"
  22 #define Y4M_FRAME_MAGIC "FRAME"
  23 #define Y4M_LINE_MAX 256
  24
  25 #ifdef CONFIG_ENCODERS
  26
  27 static int yuv4_generate_header(AVFormatContext *s, char* buf)
  28 {
  29     AVStream *st;
  30     int width, height;
  31     int raten, rated, aspectn, aspectd, n;
  32     char inter;
  33
  34     st = s->streams[0];
  35     width = st->codec.width;
  36     height = st->codec.height;
  37
  38     av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
  39
  40     aspectn = st->codec.sample_aspect_ratio.num;
  41     aspectd = st->codec.sample_aspect_ratio.den;
  42
  43     inter = 'p'; /* progressive is the default */
  44     if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) {
  45         inter = st->codec.coded_frame->top_field_first ? 't' : 'b';
  46     }
  47
  48     /* construct stream header, if this is the first frame */
  49     n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
  50                  Y4M_MAGIC,
  51                  width,
  52                  height,
  53                  raten, rated,
  54                  inter,
  55                  aspectn, aspectd,
  56                  (st->codec.pix_fmt == PIX_FMT_YUV411P) ? " XYSCSS=411" : "");
  57
  58     return n;
  59 }
  60
  61 static int yuv4_write_packet(AVFormatContext *s, int stream_index,
  62                              const uint8_t *buf, int size, int64_t pts)
  63 {
  64     AVStream *st = s->streams[stream_index];
  65     ByteIOContext *pb = &s->pb;
  66     AVPicture *picture;
  67     int* first_pkt = s->priv_data;
  68     int width, height;
  69     int i, m;
  70     char buf2[Y4M_LINE_MAX+1];
  71     char buf1[20];
  72     uint8_t *ptr, *ptr1, *ptr2;
  73
  74     picture = (AVPicture *)buf;
  75
  76     /* for the first packet we have to output the header as well */
  77     if (*first_pkt) {
  78         *first_pkt = 0;
  79         if (yuv4_generate_header(s, buf2) < 0) {
  80             fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
  81             return -EIO;
  82         } else {
  83             put_buffer(pb, buf2, strlen(buf2));
  84         }
  85     }
  86
  87     /* construct frame header */
  88
  89     m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
  90     put_buffer(pb, buf1, strlen(buf1));
  91
  92     width = st->codec.width;
  93     height = st->codec.height;
  94
  95     ptr = picture->data[0];
  96     for(i=0;i<height;i++) {
  97         put_buffer(pb, ptr, width);
  98         ptr += picture->linesize[0];
  99     }
 100
 101     height >>= 1;
 102     width >>= 1;
 103     ptr1 = picture->data[1];
 104     ptr2 = picture->data[2];
 105     for(i=0;i<height;i++) {             /* Cb */
 106         put_buffer(pb, ptr1, width);
 107         ptr1 += picture->linesize[1];
 108     }
 109     for(i=0;i<height;i++) {     /* Cr */
 110         put_buffer(pb, ptr2, width);
 111             ptr2 += picture->linesize[2];
 112     }
 113     put_flush_packet(pb);
 114     return 0;
 115 }
 116
 117 static int yuv4_write_header(AVFormatContext *s)
 118 {
 119     int* first_pkt = s->priv_data;
 120
 121     if (s->nb_streams != 1)
 122         return -EIO;
 123
 124     if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) {
 125         fprintf(stderr, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n");
 126     }
 127     else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) {
 128         fprintf(stderr, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n");
 129         return -EIO;
 130     }
 131
 132     *first_pkt = 1;
 133     return 0;
 134 }
 135
 136 static int yuv4_write_trailer(AVFormatContext *s)
 137 {
 138     return 0;
 139 }
 140
 141 AVOutputFormat yuv4mpegpipe_oformat = {
 142     "yuv4mpegpipe",
 143     "YUV4MPEG pipe format",
 144     "",
 145     "yuv4mpeg",
 146     sizeof(int),
 147     CODEC_ID_NONE,
 148     CODEC_ID_RAWVIDEO,
 149     yuv4_write_header,
 150     yuv4_write_packet,
 151     yuv4_write_trailer,
 152     .flags = AVFMT_RAWPICTURE,
 153 };
 154 #endif //CONFIG_ENCODERS
 155
 156 /* Header size increased to allow room for optional flags */
 157 #define MAX_YUV4_HEADER 80
 158 #define MAX_FRAME_HEADER 10
 159
 160 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
 161 {
 162     char header[MAX_YUV4_HEADER+1];
 163     int i;
 164     ByteIOContext *pb = &s->pb;
 165     int width, height, raten, rated, aspectn, aspectd;
 166     char lacing;
 167     AVStream *st;
 168
 169     for (i=0; i<MAX_YUV4_HEADER; i++) {
 170         header[i] = get_byte(pb);
 171         if (header[i] == '\n') {
 172             header[i+1] = 0;
 173             break;
 174         }
 175     }
 176     if (i == MAX_YUV4_HEADER) return -1;
 177     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
 178     sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
 179            &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
 180
 181     st = av_new_stream(s, 0);
 182     st = s->streams[0];
 183     st->codec.width = width;
 184     st->codec.height = height;
 185     av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
 186     st->codec.frame_rate = raten;
 187     st->codec.frame_rate_base = rated;
 188     st->codec.pix_fmt = PIX_FMT_YUV420P;
 189     st->codec.codec_type = CODEC_TYPE_VIDEO;
 190     st->codec.codec_id = CODEC_ID_RAWVIDEO;
 191     st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd};
 192
 193     return 0;
 194 }
 195
 196 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
 197 {
 198     int i;
 199     char header[MAX_FRAME_HEADER+1];
 200     int packet_size, ret, width, height;
 201     AVStream *st = s->streams[0];
 202
 203     for (i=0; i<MAX_FRAME_HEADER; i++) {
 204         header[i] = get_byte(&s->pb);
 205         if (header[i] == '\n') {
 206             header[i+1] = 0;
 207             break;
 208         }
 209     }
 210     if (i == MAX_FRAME_HEADER) return -1;
 211     if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
 212
 213     width = st->codec.width;
 214     height = st->codec.height;
 215
 216     packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
 217     if (packet_size < 0)
 218         av_abort();
 219
 220     if (av_new_packet(pkt, packet_size) < 0)
 221         return -EIO;
 222
 223     pkt->stream_index = 0;
 224     ret = get_buffer(&s->pb, pkt->data, pkt->size);
 225     if (ret != pkt->size) {
 226         av_free_packet(pkt);
 227         return -EIO;
 228     } else {
 229         return 0;
 230     }
 231 }
 232
 233 static int yuv4_read_close(AVFormatContext *s)
 234 {
 235     return 0;
 236 }
 237
 238 AVInputFormat yuv4mpegpipe_iformat = {
 239     "yuv4mpegpipe",
 240     "YUV4MPEG pipe format",
 241     0,
 242     NULL,
 243     yuv4_read_header,
 244     yuv4_read_packet,
 245     yuv4_read_close,
 246     .extensions = "yuv4mpeg"
 247 };
 248
 249 int yuv4mpeg_init(void)
 250 {
 251     av_register_input_format(&yuv4mpegpipe_iformat);
 252 #ifdef CONFIG_ENCODERS
 253     av_register_output_format(&yuv4mpegpipe_oformat);
 254 #endif //CONFIG_ENCODERS
 255     return 0;
 256 }
 257