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->chroma_sample_location == AVCHROMA_LOC_TOPLEFT)?" C420paldv XYSCSS=420PALDV":
  66                      (st->codec->chroma_sample_location == AVCHROMA_LOC_LEFT)   ?" C420mpeg2 XYSCSS=420MPEG2":
  67                      " C420jpeg XYSCSS=420JPEG";
  68         break;
  69     case PIX_FMT_YUV422P:
  70         colorspace = " C422 XYSCSS=422";
  71         break;
  72     case PIX_FMT_YUV444P:
  73         colorspace = " C444 XYSCSS=444";
  74         break;
  75     }
  76
  77     /* construct stream header, if this is the first frame */
  78     n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
  79                  Y4M_MAGIC,
  80                  width,
  81                  height,
  82                  raten, rated,
  83                  inter,
  84                  aspectn, aspectd,
  85                  colorspace);
  86
  87     return n;
  88 }
  89
  90 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
  91 {
  92     AVStream *st = s->streams[pkt->stream_index];
  93     ByteIOContext *pb = s->pb;
  94     AVPicture *picture;
  95     int* first_pkt = s->priv_data;
  96     int width, height, h_chroma_shift, v_chroma_shift;
  97     int i, m;
  98     char buf2[Y4M_LINE_MAX+1];
  99     char buf1[20];
 100     uint8_t *ptr, *ptr1, *ptr2;
 101
 102     picture = (AVPicture *)pkt->data;
 103
 104     /* for the first packet we have to output the header as well */
 105     if (*first_pkt) {
 106         *first_pkt = 0;
 107         if (yuv4_generate_header(s, buf2) < 0) {
 108             av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
 109             return AVERROR(EIO);
 110         } else {
 111             put_buffer(pb, buf2, strlen(buf2));
 112         }
 113     }
 114
 115     /* construct frame header */
 116
 117     m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
 118     put_buffer(pb, buf1, strlen(buf1));
 119
 120     width = st->codec->width;
 121     height = st->codec->height;
 122
 123     ptr = picture->data[0];
 124     for(i=0;i<height;i++) {
 125         put_buffer(pb, ptr, width);
 126         ptr += picture->linesize[0];
 127     }
 128
 129     if (st->codec->pix_fmt != PIX_FMT_GRAY8){
 130     // Adjust for smaller Cb and Cr planes
 131     avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, &v_chroma_shift);
 132     width >>= h_chroma_shift;
 133     height >>= v_chroma_shift;
 134
 135     ptr1 = picture->data[1];
 136     ptr2 = picture->data[2];
 137     for(i=0;i<height;i++) {     /* Cb */
 138         put_buffer(pb, ptr1, width);
 139         ptr1 += picture->linesize[1];
 140     }
 141     for(i=0;i<height;i++) {     /* Cr */
 142         put_buffer(pb, ptr2, width);
 143             ptr2 += picture->linesize[2];
 144     }
 145     }
 146     put_flush_packet(pb);
 147     return 0;
 148 }
 149
 150 static int yuv4_write_header(AVFormatContext *s)
 151 {
 152     int* first_pkt = s->priv_data;
 153
 154     if (s->nb_streams != 1)
 155         return AVERROR(EIO);
 156
 157     if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
 158         av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n");
 159     }
 160     else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
 161              (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
 162              (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
 163              (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
 164         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");
 165         return AVERROR(EIO);
 166     }
 167
 168     *first_pkt = 1;
 169     return 0;
 170 }
 171
 172 AVOutputFormat yuv4mpegpipe_muxer = {
 173     "yuv4mpegpipe",
 174     NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
 175     "",
 176     "y4m",
 177     sizeof(int),
 178     CODEC_ID_NONE,
 179     CODEC_ID_RAWVIDEO,
 180     yuv4_write_header,
 181     yuv4_write_packet,
 182     .flags = AVFMT_RAWPICTURE,
 183 };
 184 #endif
 185
 186 /* Header size increased to allow room for optional flags */
 187 #define MAX_YUV4_HEADER 80
 188 #define MAX_FRAME_HEADER 80
 189
 190 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
 191 {
 192     char header[MAX_YUV4_HEADER+10];  // Include headroom for the longest option
 193     char *tokstart,*tokend,*header_end;
 194     int i;
 195     ByteIOContext *pb = s->pb;
 196     int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
 197     enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
 198     enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
 199     AVStream *st;
 200     struct frame_attributes *s1 = s->priv_data;
 201
 202     for (i=0; i<MAX_YUV4_HEADER; i++) {
 203         header[i] = get_byte(pb);
 204         if (header[i] == '\n') {
 205             header[i+1] = 0x20;  // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
 206             header[i+2] = 0;
 207             break;
 208         }
 209     }
 210     if (i == MAX_YUV4_HEADER) return -1;
 211     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
 212
 213     s1->interlaced_frame = 0;
 214     s1->top_field_first = 0;
 215     header_end = &header[i+1]; // Include space
 216     for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
 217         if (*tokstart==0x20) continue;
 218         switch (*tokstart++) {
 219         case 'W': // Width. Required.
 220             width = strtol(tokstart, &tokend, 10);
 221             tokstart=tokend;
 222             break;
 223         case 'H': // Height. Required.
 224             height = strtol(tokstart, &tokend, 10);
 225             tokstart=tokend;
 226             break;
 227         case 'C': // Color space
 228             if (strncmp("420jpeg",tokstart,7)==0) {
 229                 pix_fmt = PIX_FMT_YUV420P;
 230                 chroma_sample_location = AVCHROMA_LOC_CENTER;
 231             } else if (strncmp("420mpeg2",tokstart,8)==0) {
 232                 pix_fmt = PIX_FMT_YUV420P;
 233                 chroma_sample_location = AVCHROMA_LOC_LEFT;
 234             } else if (strncmp("420paldv", tokstart, 8)==0) {
 235                 pix_fmt = PIX_FMT_YUV420P;
 236                 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
 237             } else if (strncmp("411", tokstart, 3)==0)
 238                 pix_fmt = PIX_FMT_YUV411P;
 239             else if (strncmp("422", tokstart, 3)==0)
 240                 pix_fmt = PIX_FMT_YUV422P;
 241             else if (strncmp("444alpha", tokstart, 8)==0) {
 242                 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
 243                 return -1;
 244             } else if (strncmp("444", tokstart, 3)==0)
 245                 pix_fmt = PIX_FMT_YUV444P;
 246             else if (strncmp("mono",tokstart, 4)==0) {
 247                 pix_fmt = PIX_FMT_GRAY8;
 248             } else {
 249                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
 250                 return -1;
 251             }
 252             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
 253             break;
 254         case 'I': // Interlace type
 255             switch (*tokstart++){
 256             case '?':
 257                 break;
 258             case 'p':
 259                 s1->interlaced_frame=0;
 260                 break;
 261             case 't':
 262                 s1->interlaced_frame=1;
 263                 s1->top_field_first=1;
 264                 break;
 265             case 'b':
 266                 s1->interlaced_frame=1;
 267                 s1->top_field_first=0;
 268                 break;
 269             case 'm':
 270                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
 271                 return -1;
 272             default:
 273                 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
 274                 return -1;
 275             }
 276             break;
 277         case 'F': // Frame rate
 278             sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
 279             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
 280             break;
 281         case 'A': // Pixel aspect
 282             sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
 283             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
 284             break;
 285         case 'X': // Vendor extensions
 286             if (strncmp("YSCSS=",tokstart,6)==0) {
 287                 // Older nonstandard pixel format representation
 288                 tokstart+=6;
 289                 if (strncmp("420JPEG",tokstart,7)==0)
 290                     alt_pix_fmt=PIX_FMT_YUV420P;
 291                 else if (strncmp("420MPEG2",tokstart,8)==0)
 292                     alt_pix_fmt=PIX_FMT_YUV420P;
 293                 else if (strncmp("420PALDV",tokstart,8)==0)
 294                     alt_pix_fmt=PIX_FMT_YUV420P;
 295                 else if (strncmp("411",tokstart,3)==0)
 296                     alt_pix_fmt=PIX_FMT_YUV411P;
 297                 else if (strncmp("422",tokstart,3)==0)
 298                     alt_pix_fmt=PIX_FMT_YUV422P;
 299                 else if (strncmp("444",tokstart,3)==0)
 300                     alt_pix_fmt=PIX_FMT_YUV444P;
 301             }
 302             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
 303             break;
 304         }
 305     }
 306
 307     if ((width == -1) || (height == -1)) {
 308         av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
 309         return -1;
 310     }
 311
 312     if (pix_fmt == PIX_FMT_NONE) {
 313         if (alt_pix_fmt == PIX_FMT_NONE)
 314             pix_fmt = PIX_FMT_YUV420P;
 315         else
 316             pix_fmt = alt_pix_fmt;
 317     }
 318
 319     if (raten == 0 && rated == 0) {
 320         // Frame rate unknown
 321         raten = 25;
 322         rated = 1;
 323     }
 324
 325     if (aspectn == 0 && aspectd == 0) {
 326         // Pixel aspect unknown
 327         aspectd = 1;
 328     }
 329
 330     st = av_new_stream(s, 0);
 331     if(!st)
 332         return AVERROR(ENOMEM);
 333     st->codec->width = width;
 334     st->codec->height = height;
 335     av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
 336     av_set_pts_info(st, 64, rated, raten);
 337     st->codec->pix_fmt = pix_fmt;
 338     st->codec->codec_type = CODEC_TYPE_VIDEO;
 339     st->codec->codec_id = CODEC_ID_RAWVIDEO;
 340     st->sample_aspect_ratio= (AVRational){aspectn, aspectd};
 341     st->codec->chroma_sample_location = chroma_sample_location;
 342
 343     return 0;
 344 }
 345
 346 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
 347 {
 348     int i;
 349     char header[MAX_FRAME_HEADER+1];
 350     int packet_size, width, height;
 351     AVStream *st = s->streams[0];
 352     struct frame_attributes *s1 = s->priv_data;
 353
 354     for (i=0; i<MAX_FRAME_HEADER; i++) {
 355         header[i] = get_byte(s->pb);
 356         if (header[i] == '\n') {
 357             header[i+1] = 0;
 358             break;
 359         }
 360     }
 361     if (i == MAX_FRAME_HEADER) return -1;
 362     if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
 363
 364     width = st->codec->width;
 365     height = st->codec->height;
 366
 367     packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
 368     if (packet_size < 0)
 369         return -1;
 370
 371     if (av_get_packet(s->pb, pkt, packet_size) != packet_size)
 372         return AVERROR(EIO);
 373
 374     if (s->streams[0]->codec->coded_frame) {
 375         s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
 376         s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
 377     }
 378
 379     pkt->stream_index = 0;
 380     return 0;
 381 }
 382
 383 static int yuv4_probe(AVProbeData *pd)
 384 {
 385     /* check file header */
 386     if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
 387         return AVPROBE_SCORE_MAX;
 388     else
 389         return 0;
 390 }
 391
 392 #if CONFIG_YUV4MPEGPIPE_DEMUXER
 393 AVInputFormat yuv4mpegpipe_demuxer = {
 394     "yuv4mpegpipe",
 395     NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
 396     sizeof(struct frame_attributes),
 397     yuv4_probe,
 398     yuv4_read_header,
 399     yuv4_read_packet,
 400     .extensions = "y4m"
 401 };
 402 #endif