libavformat/yuv4mpeg.c

   1 /*
   2  * YUV4MPEG format
   3  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #include "avformat.h"
  22
  23 #define Y4M_MAGIC "YUV4MPEG2"
  24 #define Y4M_FRAME_MAGIC "FRAME"
  25 #define Y4M_LINE_MAX 256
  26
  27 struct frame_attributes {
  28     int interlaced_frame;
  29     int top_field_first;
  30 };
  31
  32 #if CONFIG_YUV4MPEGPIPE_MUXER
  33 static int yuv4_generate_header(AVFormatContext *s, char* buf)
  34 {
  35     AVStream *st;
  36     int width, height;
  37     int raten, rated, aspectn, aspectd, n;
  38     char inter;
  39     const char *colorspace = "";
  40
  41     st = s->streams[0];
  42     width = st->codec->width;
  43     height = st->codec->height;
  44
  45     av_reduce(&raten, &rated, st->codec->time_base.den, st->codec->time_base.num, (1UL<<31)-1);
  46
  47     aspectn = st->sample_aspect_ratio.num;
  48     aspectd = st->sample_aspect_ratio.den;
  49
  50     if ( aspectn == 0 && aspectd == 1 ) aspectd = 0;  // 0:0 means unknown
  51
  52     inter = 'p'; /* progressive is the default */
  53     if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame) {
  54         inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
  55     }
  56
  57     switch(st->codec->pix_fmt) {
  58     case PIX_FMT_GRAY8:
  59         colorspace = " Cmono";
  60         break;
  61     case PIX_FMT_YUV411P:
  62         colorspace = " C411 XYSCSS=411";
  63         break;
  64     case PIX_FMT_YUV420P:
  65         colorspace = (st->codec->codec_id == CODEC_ID_DVVIDEO)?" C420paldv XYSCSS=420PALDV":" C420mpeg2 XYSCSS=420MPEG2";
  66         break;
  67     case PIX_FMT_YUV422P:
  68         colorspace = " C422 XYSCSS=422";
  69         break;
  70     case PIX_FMT_YUV444P:
  71         colorspace = " C444 XYSCSS=444";
  72         break;
  73     }
  74
  75     /* construct stream header, if this is the first frame */
  76     n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
  77                  Y4M_MAGIC,
  78                  width,
  79                  height,
  80                  raten, rated,
  81                  inter,
  82                  aspectn, aspectd,
  83                  colorspace);
  84
  85     return n;
  86 }
  87
  88 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
  89 {
  90     AVStream *st = s->streams[pkt->stream_index];
  91     ByteIOContext *pb = s->pb;
  92     AVPicture *picture;
  93     int* first_pkt = s->priv_data;
  94     int width, height, h_chroma_shift, v_chroma_shift;
  95     int i, m;
  96     char buf2[Y4M_LINE_MAX+1];
  97     char buf1[20];
  98     uint8_t *ptr, *ptr1, *ptr2;
  99
 100     picture = (AVPicture *)pkt->data;
 101
 102     /* for the first packet we have to output the header as well */
 103     if (*first_pkt) {
 104         *first_pkt = 0;
 105         if (yuv4_generate_header(s, buf2) < 0) {
 106             av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
 107             return AVERROR(EIO);
 108         } else {
 109             put_buffer(pb, buf2, strlen(buf2));
 110         }
 111     }
 112
 113     /* construct frame header */
 114
 115     m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
 116     put_buffer(pb, buf1, strlen(buf1));
 117
 118     width = st->codec->width;
 119     height = st->codec->height;
 120
 121     ptr = picture->data[0];
 122     for(i=0;i<height;i++) {
 123         put_buffer(pb, ptr, width);
 124         ptr += picture->linesize[0];
 125     }
 126
 127     if (st->codec->pix_fmt != PIX_FMT_GRAY8){
 128     // Adjust for smaller Cb and Cr planes
 129     avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, &v_chroma_shift);
 130     width >>= h_chroma_shift;
 131     height >>= v_chroma_shift;
 132
 133     ptr1 = picture->data[1];
 134     ptr2 = picture->data[2];
 135     for(i=0;i<height;i++) {     /* Cb */
 136         put_buffer(pb, ptr1, width);
 137         ptr1 += picture->linesize[1];
 138     }
 139     for(i=0;i<height;i++) {     /* Cr */
 140         put_buffer(pb, ptr2, width);
 141             ptr2 += picture->linesize[2];
 142     }
 143     }
 144     put_flush_packet(pb);
 145     return 0;
 146 }
 147
 148 static int yuv4_write_header(AVFormatContext *s)
 149 {
 150     int* first_pkt = s->priv_data;
 151
 152     if (s->nb_streams != 1)
 153         return AVERROR(EIO);
 154
 155     if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
 156         av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n");
 157     }
 158     else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
 159              (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
 160              (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
 161              (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
 162         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");
 163         return AVERROR(EIO);
 164     }
 165
 166     *first_pkt = 1;
 167     return 0;
 168 }
 169
 170 AVOutputFormat yuv4mpegpipe_muxer = {
 171     "yuv4mpegpipe",
 172     NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
 173     "",
 174     "y4m",
 175     sizeof(int),
 176     CODEC_ID_NONE,
 177     CODEC_ID_RAWVIDEO,
 178     yuv4_write_header,
 179     yuv4_write_packet,
 180     .flags = AVFMT_RAWPICTURE,
 181 };
 182 #endif
 183
 184 /* Header size increased to allow room for optional flags */
 185 #define MAX_YUV4_HEADER 80
 186 #define MAX_FRAME_HEADER 80
 187
 188 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
 189 {
 190     char header[MAX_YUV4_HEADER+10];  // Include headroom for the longest option
 191     char *tokstart,*tokend,*header_end;
 192     int i;
 193     ByteIOContext *pb = s->pb;
 194     int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
 195     enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
 196     AVStream *st;
 197     struct frame_attributes *s1 = s->priv_data;
 198
 199     for (i=0; i<MAX_YUV4_HEADER; i++) {
 200         header[i] = get_byte(pb);
 201         if (header[i] == '\n') {
 202             header[i+1] = 0x20;  // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
 203             header[i+2] = 0;
 204             break;
 205         }
 206     }
 207     if (i == MAX_YUV4_HEADER) return -1;
 208     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
 209
 210     s1->interlaced_frame = 0;
 211     s1->top_field_first = 0;
 212     header_end = &header[i+1]; // Include space
 213     for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
 214         if (*tokstart==0x20) continue;
 215         switch (*tokstart++) {
 216         case 'W': // Width. Required.
 217             width = strtol(tokstart, &tokend, 10);
 218             tokstart=tokend;
 219             break;
 220         case 'H': // Height. Required.
 221             height = strtol(tokstart, &tokend, 10);
 222             tokstart=tokend;
 223             break;
 224         case 'C': // Color space
 225             if (strncmp("420jpeg",tokstart,7)==0)
 226                 pix_fmt = PIX_FMT_YUV420P;
 227             else if (strncmp("420mpeg2",tokstart,8)==0)
 228                 pix_fmt = PIX_FMT_YUV420P;
 229             else if (strncmp("420paldv", tokstart, 8)==0)
 230                 pix_fmt = PIX_FMT_YUV420P;
 231             else if (strncmp("411", tokstart, 3)==0)
 232                 pix_fmt = PIX_FMT_YUV411P;
 233             else if (strncmp("422", tokstart, 3)==0)
 234                 pix_fmt = PIX_FMT_YUV422P;
 235             else if (strncmp("444alpha", tokstart, 8)==0) {
 236                 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
 237                 return -1;
 238             } else if (strncmp("444", tokstart, 3)==0)
 239                 pix_fmt = PIX_FMT_YUV444P;
 240             else if (strncmp("mono",tokstart, 4)==0) {
 241                 pix_fmt = PIX_FMT_GRAY8;
 242             } else {
 243                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
 244                 return -1;
 245             }
 246             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
 247             break;
 248         case 'I': // Interlace type
 249             switch (*tokstart++){
 250             case '?':
 251                 break;
 252             case 'p':
 253                 s1->interlaced_frame=0;
 254                 break;
 255             case 't':
 256                 s1->interlaced_frame=1;
 257                 s1->top_field_first=1;
 258                 break;
 259             case 'b':
 260                 s1->interlaced_frame=1;
 261                 s1->top_field_first=0;
 262                 break;
 263             case 'm':
 264                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
 265                 return -1;
 266             default:
 267                 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
 268                 return -1;
 269             }
 270             break;
 271         case 'F': // Frame rate
 272             sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
 273             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
 274             break;
 275         case 'A': // Pixel aspect
 276             sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
 277             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
 278             break;
 279         case 'X': // Vendor extensions
 280             if (strncmp("YSCSS=",tokstart,6)==0) {
 281                 // Older nonstandard pixel format representation
 282                 tokstart+=6;
 283                 if (strncmp("420JPEG",tokstart,7)==0)
 284                     alt_pix_fmt=PIX_FMT_YUV420P;
 285                 else if (strncmp("420MPEG2",tokstart,8)==0)
 286                     alt_pix_fmt=PIX_FMT_YUV420P;
 287                 else if (strncmp("420PALDV",tokstart,8)==0)
 288                     alt_pix_fmt=PIX_FMT_YUV420P;
 289                 else if (strncmp("411",tokstart,3)==0)
 290                     alt_pix_fmt=PIX_FMT_YUV411P;
 291                 else if (strncmp("422",tokstart,3)==0)
 292                     alt_pix_fmt=PIX_FMT_YUV422P;
 293                 else if (strncmp("444",tokstart,3)==0)
 294                     alt_pix_fmt=PIX_FMT_YUV444P;
 295             }
 296             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
 297             break;
 298         }
 299     }
 300
 301     if ((width == -1) || (height == -1)) {
 302         av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
 303         return -1;
 304     }
 305
 306     if (pix_fmt == PIX_FMT_NONE) {
 307         if (alt_pix_fmt == PIX_FMT_NONE)
 308             pix_fmt = PIX_FMT_YUV420P;
 309         else
 310             pix_fmt = alt_pix_fmt;
 311     }
 312
 313     if (raten == 0 && rated == 0) {
 314         // Frame rate unknown
 315         raten = 25;
 316         rated = 1;
 317     }
 318
 319     if (aspectn == 0 && aspectd == 0) {
 320         // Pixel aspect unknown
 321         aspectd = 1;
 322     }
 323
 324     st = av_new_stream(s, 0);
 325     if(!st)
 326         return AVERROR(ENOMEM);
 327     st->codec->width = width;
 328     st->codec->height = height;
 329     av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
 330     av_set_pts_info(st, 64, rated, raten);
 331     st->codec->pix_fmt = pix_fmt;
 332     st->codec->codec_type = CODEC_TYPE_VIDEO;
 333     st->codec->codec_id = CODEC_ID_RAWVIDEO;
 334     st->sample_aspect_ratio= (AVRational){aspectn, aspectd};
 335
 336     return 0;
 337 }
 338
 339 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
 340 {
 341     int i;
 342     char header[MAX_FRAME_HEADER+1];
 343     int packet_size, width, height;
 344     AVStream *st = s->streams[0];
 345     struct frame_attributes *s1 = s->priv_data;
 346
 347     for (i=0; i<MAX_FRAME_HEADER; i++) {
 348         header[i] = get_byte(s->pb);
 349         if (header[i] == '\n') {
 350             header[i+1] = 0;
 351             break;
 352         }
 353     }
 354     if (i == MAX_FRAME_HEADER) return -1;
 355     if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
 356
 357     width = st->codec->width;
 358     height = st->codec->height;
 359
 360     packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
 361     if (packet_size < 0)
 362         return -1;
 363
 364     if (av_get_packet(s->pb, pkt, packet_size) != packet_size)
 365         return AVERROR(EIO);
 366
 367     if (s->streams[0]->codec->coded_frame) {
 368         s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
 369         s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
 370     }
 371
 372     pkt->stream_index = 0;
 373     return 0;
 374 }
 375
 376 static int yuv4_probe(AVProbeData *pd)
 377 {
 378     /* check file header */
 379     if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
 380         return AVPROBE_SCORE_MAX;
 381     else
 382         return 0;
 383 }
 384
 385 #if CONFIG_YUV4MPEGPIPE_DEMUXER
 386 AVInputFormat yuv4mpegpipe_demuxer = {
 387     "yuv4mpegpipe",
 388     NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
 389     sizeof(struct frame_attributes),
 390     yuv4_probe,
 391     yuv4_read_header,
 392     yuv4_read_packet,
 393     .extensions = "y4m"
 394 };
 395 #endif