FFmpeg: libavformat/yuv4mpeg.c Source File

00001 /*
00002  * YUV4MPEG format
00003  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 #include "avformat.h"
00022 
00023 #define Y4M_MAGIC "YUV4MPEG2"
00024 #define Y4M_FRAME_MAGIC "FRAME"
00025 #define Y4M_LINE_MAX 256
00026 
00027 struct frame_attributes {
00028     int interlaced_frame;
00029     int top_field_first;
00030 };
00031 
00032 #if CONFIG_YUV4MPEGPIPE_MUXER
00033 static int yuv4_generate_header(AVFormatContext *s, char* buf)
00034 {
00035     AVStream *st;
00036     int width, height;
00037     int raten, rated, aspectn, aspectd, n;
00038     char inter;
00039     const char *colorspace = "";
00040 
00041     st = s->streams[0];
00042     width = st->codec->width;
00043     height = st->codec->height;
00044 
00045     av_reduce(&raten, &rated, st->codec->time_base.den, st->codec->time_base.num, (1UL<<31)-1);
00046 
00047     aspectn = st->sample_aspect_ratio.num;
00048     aspectd = st->sample_aspect_ratio.den;
00049 
00050     if ( aspectn == 0 && aspectd == 1 ) aspectd = 0;  // 0:0 means unknown
00051 
00052     inter = 'p'; /* progressive is the default */
00053     if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame) {
00054         inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
00055     }
00056 
00057     switch(st->codec->pix_fmt) {
00058     case PIX_FMT_GRAY8:
00059         colorspace = " Cmono";
00060         break;
00061     case PIX_FMT_YUV411P:
00062         colorspace = " C411 XYSCSS=411";
00063         break;
00064     case PIX_FMT_YUV420P:
00065         colorspace = (st->codec->chroma_sample_location == AVCHROMA_LOC_TOPLEFT)?" C420paldv XYSCSS=420PALDV":
00066                      (st->codec->chroma_sample_location == AVCHROMA_LOC_LEFT)   ?" C420mpeg2 XYSCSS=420MPEG2":
00067                      " C420jpeg XYSCSS=420JPEG";
00068         break;
00069     case PIX_FMT_YUV422P:
00070         colorspace = " C422 XYSCSS=422";
00071         break;
00072     case PIX_FMT_YUV444P:
00073         colorspace = " C444 XYSCSS=444";
00074         break;
00075     }
00076 
00077     /* construct stream header, if this is the first frame */
00078     n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
00079                  Y4M_MAGIC,
00080                  width,
00081                  height,
00082                  raten, rated,
00083                  inter,
00084                  aspectn, aspectd,
00085                  colorspace);
00086 
00087     return n;
00088 }
00089 
00090 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
00091 {
00092     AVStream *st = s->streams[pkt->stream_index];
00093     ByteIOContext *pb = s->pb;
00094     AVPicture *picture;
00095     int* first_pkt = s->priv_data;
00096     int width, height, h_chroma_shift, v_chroma_shift;
00097     int i, m;
00098     char buf2[Y4M_LINE_MAX+1];
00099     char buf1[20];
00100     uint8_t *ptr, *ptr1, *ptr2;
00101 
00102     picture = (AVPicture *)pkt->data;
00103 
00104     /* for the first packet we have to output the header as well */
00105     if (*first_pkt) {
00106         *first_pkt = 0;
00107         if (yuv4_generate_header(s, buf2) < 0) {
00108             av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
00109             return AVERROR(EIO);
00110         } else {
00111             put_buffer(pb, buf2, strlen(buf2));
00112         }
00113     }
00114 
00115     /* construct frame header */
00116 
00117     m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
00118     put_buffer(pb, buf1, strlen(buf1));
00119 
00120     width = st->codec->width;
00121     height = st->codec->height;
00122 
00123     ptr = picture->data[0];
00124     for(i=0;i<height;i++) {
00125         put_buffer(pb, ptr, width);
00126         ptr += picture->linesize[0];
00127     }
00128 
00129     if (st->codec->pix_fmt != PIX_FMT_GRAY8){
00130     // Adjust for smaller Cb and Cr planes
00131     avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, &v_chroma_shift);
00132     width >>= h_chroma_shift;
00133     height >>= v_chroma_shift;
00134 
00135     ptr1 = picture->data[1];
00136     ptr2 = picture->data[2];
00137     for(i=0;i<height;i++) {     /* Cb */
00138         put_buffer(pb, ptr1, width);
00139         ptr1 += picture->linesize[1];
00140     }
00141     for(i=0;i<height;i++) {     /* Cr */
00142         put_buffer(pb, ptr2, width);
00143             ptr2 += picture->linesize[2];
00144     }
00145     }
00146     put_flush_packet(pb);
00147     return 0;
00148 }
00149 
00150 static int yuv4_write_header(AVFormatContext *s)
00151 {
00152     int* first_pkt = s->priv_data;
00153 
00154     if (s->nb_streams != 1)
00155         return AVERROR(EIO);
00156 
00157     if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
00158         av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n");
00159     }
00160     else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
00161              (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
00162              (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
00163              (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
00164         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");
00165         return AVERROR(EIO);
00166     }
00167 
00168     *first_pkt = 1;
00169     return 0;
00170 }
00171 
00172 AVOutputFormat yuv4mpegpipe_muxer = {
00173     "yuv4mpegpipe",
00174     NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
00175     "",
00176     "y4m",
00177     sizeof(int),
00178     CODEC_ID_NONE,
00179     CODEC_ID_RAWVIDEO,
00180     yuv4_write_header,
00181     yuv4_write_packet,
00182     .flags = AVFMT_RAWPICTURE,
00183 };
00184 #endif
00185 
00186 /* Header size increased to allow room for optional flags */
00187 #define MAX_YUV4_HEADER 80
00188 #define MAX_FRAME_HEADER 80
00189 
00190 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
00191 {
00192     char header[MAX_YUV4_HEADER+10];  // Include headroom for the longest option
00193     char *tokstart,*tokend,*header_end;
00194     int i;
00195     ByteIOContext *pb = s->pb;
00196     int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
00197     enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
00198     enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
00199     AVStream *st;
00200     struct frame_attributes *s1 = s->priv_data;
00201 
00202     for (i=0; i<MAX_YUV4_HEADER; i++) {
00203         header[i] = get_byte(pb);
00204         if (header[i] == '\n') {
00205             header[i+1] = 0x20;  // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
00206             header[i+2] = 0;
00207             break;
00208         }
00209     }
00210     if (i == MAX_YUV4_HEADER) return -1;
00211     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
00212 
00213     s1->interlaced_frame = 0;
00214     s1->top_field_first = 0;
00215     header_end = &header[i+1]; // Include space
00216     for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
00217         if (*tokstart==0x20) continue;
00218         switch (*tokstart++) {
00219         case 'W': // Width. Required.
00220             width = strtol(tokstart, &tokend, 10);
00221             tokstart=tokend;
00222             break;
00223         case 'H': // Height. Required.
00224             height = strtol(tokstart, &tokend, 10);
00225             tokstart=tokend;
00226             break;
00227         case 'C': // Color space
00228             if (strncmp("420jpeg",tokstart,7)==0) {
00229                 pix_fmt = PIX_FMT_YUV420P;
00230                 chroma_sample_location = AVCHROMA_LOC_CENTER;
00231             } else if (strncmp("420mpeg2",tokstart,8)==0) {
00232                 pix_fmt = PIX_FMT_YUV420P;
00233                 chroma_sample_location = AVCHROMA_LOC_LEFT;
00234             } else if (strncmp("420paldv", tokstart, 8)==0) {
00235                 pix_fmt = PIX_FMT_YUV420P;
00236                 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
00237             } else if (strncmp("411", tokstart, 3)==0)
00238                 pix_fmt = PIX_FMT_YUV411P;
00239             else if (strncmp("422", tokstart, 3)==0)
00240                 pix_fmt = PIX_FMT_YUV422P;
00241             else if (strncmp("444alpha", tokstart, 8)==0) {
00242                 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
00243                 return -1;
00244             } else if (strncmp("444", tokstart, 3)==0)
00245                 pix_fmt = PIX_FMT_YUV444P;
00246             else if (strncmp("mono",tokstart, 4)==0) {
00247                 pix_fmt = PIX_FMT_GRAY8;
00248             } else {
00249                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
00250                 return -1;
00251             }
00252             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
00253             break;
00254         case 'I': // Interlace type
00255             switch (*tokstart++){
00256             case '?':
00257                 break;
00258             case 'p':
00259                 s1->interlaced_frame=0;
00260                 break;
00261             case 't':
00262                 s1->interlaced_frame=1;
00263                 s1->top_field_first=1;
00264                 break;
00265             case 'b':
00266                 s1->interlaced_frame=1;
00267                 s1->top_field_first=0;
00268                 break;
00269             case 'm':
00270                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
00271                 return -1;
00272             default:
00273                 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
00274                 return -1;
00275             }
00276             break;
00277         case 'F': // Frame rate
00278             sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
00279             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
00280             break;
00281         case 'A': // Pixel aspect
00282             sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
00283             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
00284             break;
00285         case 'X': // Vendor extensions
00286             if (strncmp("YSCSS=",tokstart,6)==0) {
00287                 // Older nonstandard pixel format representation
00288                 tokstart+=6;
00289                 if (strncmp("420JPEG",tokstart,7)==0)
00290                     alt_pix_fmt=PIX_FMT_YUV420P;
00291                 else if (strncmp("420MPEG2",tokstart,8)==0)
00292                     alt_pix_fmt=PIX_FMT_YUV420P;
00293                 else if (strncmp("420PALDV",tokstart,8)==0)
00294                     alt_pix_fmt=PIX_FMT_YUV420P;
00295                 else if (strncmp("411",tokstart,3)==0)
00296                     alt_pix_fmt=PIX_FMT_YUV411P;
00297                 else if (strncmp("422",tokstart,3)==0)
00298                     alt_pix_fmt=PIX_FMT_YUV422P;
00299                 else if (strncmp("444",tokstart,3)==0)
00300                     alt_pix_fmt=PIX_FMT_YUV444P;
00301             }
00302             while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
00303             break;
00304         }
00305     }
00306 
00307     if ((width == -1) || (height == -1)) {
00308         av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
00309         return -1;
00310     }
00311 
00312     if (pix_fmt == PIX_FMT_NONE) {
00313         if (alt_pix_fmt == PIX_FMT_NONE)
00314             pix_fmt = PIX_FMT_YUV420P;
00315         else
00316             pix_fmt = alt_pix_fmt;
00317     }
00318 
00319     if (raten == 0 && rated == 0) {
00320         // Frame rate unknown
00321         raten = 25;
00322         rated = 1;
00323     }
00324 
00325     if (aspectn == 0 && aspectd == 0) {
00326         // Pixel aspect unknown
00327         aspectd = 1;
00328     }
00329 
00330     st = av_new_stream(s, 0);
00331     if(!st)
00332         return AVERROR(ENOMEM);
00333     st->codec->width = width;
00334     st->codec->height = height;
00335     av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
00336     av_set_pts_info(st, 64, rated, raten);
00337     st->codec->pix_fmt = pix_fmt;
00338     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00339     st->codec->codec_id = CODEC_ID_RAWVIDEO;
00340     st->sample_aspect_ratio= (AVRational){aspectn, aspectd};
00341     st->codec->chroma_sample_location = chroma_sample_location;
00342 
00343     return 0;
00344 }
00345 
00346 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
00347 {
00348     int i;
00349     char header[MAX_FRAME_HEADER+1];
00350     int packet_size, width, height;
00351     AVStream *st = s->streams[0];
00352     struct frame_attributes *s1 = s->priv_data;
00353 
00354     for (i=0; i<MAX_FRAME_HEADER; i++) {
00355         header[i] = get_byte(s->pb);
00356         if (header[i] == '\n') {
00357             header[i+1] = 0;
00358             break;
00359         }
00360     }
00361     if (i == MAX_FRAME_HEADER) return -1;
00362     if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
00363 
00364     width = st->codec->width;
00365     height = st->codec->height;
00366 
00367     packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
00368     if (packet_size < 0)
00369         return -1;
00370 
00371     if (av_get_packet(s->pb, pkt, packet_size) != packet_size)
00372         return AVERROR(EIO);
00373 
00374     if (s->streams[0]->codec->coded_frame) {
00375         s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
00376         s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
00377     }
00378 
00379     pkt->stream_index = 0;
00380     return 0;
00381 }
00382 
00383 static int yuv4_probe(AVProbeData *pd)
00384 {
00385     /* check file header */
00386     if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
00387         return AVPROBE_SCORE_MAX;
00388     else
00389         return 0;
00390 }
00391 
00392 #if CONFIG_YUV4MPEGPIPE_DEMUXER
00393 AVInputFormat yuv4mpegpipe_demuxer = {
00394     "yuv4mpegpipe",
00395     NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
00396     sizeof(struct frame_attributes),
00397     yuv4_probe,
00398     yuv4_read_header,
00399     yuv4_read_packet,
00400     .extensions = "y4m"
00401 };
00402 #endif