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
  28 static struct { int n; int d;} SAR[] = {{10, 11}, /*  4:3 NTSC */
  29                                         {59, 54}, /*  4:3 PAL  */
  30                                         {40, 33}, /* 16:9 NTSC */
  31                                        {118, 81}, /* 16:9 PAL  */
  32                                         { 1,  1}};/* should always be the last */
  33
  34 static int yuv4_generate_header(AVFormatContext *s, char* buf)
  35 {
  36     AVStream *st;
  37     int width, height;
  38     int raten, rated, aspectn, aspectd, n, i;
  39     char inter;
  40
  41     st = s->streams[0];
  42     width = st->codec.width;
  43     height = st->codec.height;
  44
  45     av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
  46
  47     for (i=0; i<sizeof(SAR)/sizeof(SAR[0])-1; i++) {
  48        if (ABS(st->codec.aspect_ratio -
  49                (float)SAR[i].n/SAR[i].d * (float)width/height) < 0.05)
  50                   break;
  51     }
  52     aspectn = SAR[i].n;
  53     aspectd = SAR[i].d;
  54
  55     inter = 'p'; /* progressive is the default */
  56     if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) {
  57         inter = st->codec.coded_frame->bottom_field_first ? 'b' : 't';
  58     }
  59
  60     /* construct stream header, if this is the first frame */
  61     n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
  62                  Y4M_MAGIC,
  63                  width,
  64                  height,
  65                  raten, rated,
  66                  inter,
  67                  aspectn, aspectd,
  68                  (st->codec.pix_fmt == PIX_FMT_YUV411P) ? " XYSCSS=411" : "");
  69
  70     return n;
  71 }
  72
  73 static int yuv4_write_packet(AVFormatContext *s, int stream_index,
  74                              const uint8_t *buf, int size, int64_t pts)
  75 {
  76     AVStream *st = s->streams[stream_index];
  77     ByteIOContext *pb = &s->pb;
  78     AVPicture *picture;
  79     int* first_pkt = s->priv_data;
  80     int width, height;
  81     int i, m;
  82     char buf2[Y4M_LINE_MAX+1];
  83     char buf1[20];
  84     uint8_t *ptr, *ptr1, *ptr2;
  85
  86     picture = (AVPicture *)buf;
  87
  88     /* for the first packet we have to output the header as well */
  89     if (*first_pkt) {
  90         *first_pkt = 0;
  91         if (yuv4_generate_header(s, buf2) < 0) {
  92             fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
  93             return -EIO;
  94         } else {
  95             put_buffer(pb, buf2, strlen(buf2));
  96         }
  97     }
  98
  99     /* construct frame header */
 100
 101     m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
 102     put_buffer(pb, buf1, strlen(buf1));
 103
 104     width = st->codec.width;
 105     height = st->codec.height;
 106
 107     ptr = picture->data[0];
 108     for(i=0;i<height;i++) {
 109         put_buffer(pb, ptr, width);
 110         ptr += picture->linesize[0];
 111     }
 112
 113     height >>= 1;
 114     width >>= 1;
 115     ptr1 = picture->data[1];
 116     ptr2 = picture->data[2];
 117     for(i=0;i<height;i++) {             /* Cb */
 118         put_buffer(pb, ptr1, width);
 119         ptr1 += picture->linesize[1];
 120     }
 121     for(i=0;i<height;i++) {     /* Cr */
 122         put_buffer(pb, ptr2, width);
 123             ptr2 += picture->linesize[2];
 124     }
 125     put_flush_packet(pb);
 126     return 0;
 127 }
 128
 129 static int yuv4_write_header(AVFormatContext *s)
 130 {
 131     int* first_pkt = s->priv_data;
 132
 133     if (s->nb_streams != 1)
 134         return -EIO;
 135
 136     if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) {
 137         fprintf(stderr, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n");
 138     }
 139     else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) {
 140         fprintf(stderr, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n");
 141         return -EIO;
 142     }
 143
 144     *first_pkt = 1;
 145     return 0;
 146 }
 147
 148 static int yuv4_write_trailer(AVFormatContext *s)
 149 {
 150     return 0;
 151 }
 152
 153 AVOutputFormat yuv4mpegpipe_oformat = {
 154     "yuv4mpegpipe",
 155     "YUV4MPEG pipe format",
 156     "",
 157     "yuv4mpeg",
 158     sizeof(int),
 159     CODEC_ID_NONE,
 160     CODEC_ID_RAWVIDEO,
 161     yuv4_write_header,
 162     yuv4_write_packet,
 163     yuv4_write_trailer,
 164     .flags = AVFMT_RAWPICTURE,
 165 };
 166 #endif //CONFIG_ENCODERS
 167
 168 /* Header size increased to allow room for optional flags */
 169 #define MAX_YUV4_HEADER 80
 170 #define MAX_FRAME_HEADER 10
 171
 172 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
 173 {
 174     char header[MAX_YUV4_HEADER+1];
 175     int i;
 176     ByteIOContext *pb = &s->pb;
 177     int width, height, raten, rated, aspectn, aspectd;
 178     char lacing;
 179     AVStream *st;
 180
 181     for (i=0; i<MAX_YUV4_HEADER; i++) {
 182         header[i] = get_byte(pb);
 183         if (header[i] == '\n') {
 184             header[i+1] = 0;
 185             break;
 186         }
 187     }
 188     if (i == MAX_YUV4_HEADER) return -1;
 189     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
 190     sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
 191            &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
 192
 193     st = av_new_stream(s, 0);
 194     st = s->streams[0];
 195     st->codec.width = width;
 196     st->codec.height = height;
 197     av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
 198     st->codec.frame_rate = raten;
 199     st->codec.frame_rate_base = rated;
 200     st->codec.pix_fmt = PIX_FMT_YUV420P;
 201     st->codec.codec_type = CODEC_TYPE_VIDEO;
 202     st->codec.codec_id = CODEC_ID_RAWVIDEO;
 203
 204     return 0;
 205 }
 206
 207 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
 208 {
 209     int i;
 210     char header[MAX_FRAME_HEADER+1];
 211     int packet_size, ret, width, height;
 212     AVStream *st = s->streams[0];
 213
 214     for (i=0; i<MAX_FRAME_HEADER; i++) {
 215         header[i] = get_byte(&s->pb);
 216         if (header[i] == '\n') {
 217             header[i+1] = 0;
 218             break;
 219         }
 220     }
 221     if (i == MAX_FRAME_HEADER) return -1;
 222     if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
 223
 224     width = st->codec.width;
 225     height = st->codec.height;
 226
 227     packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
 228     if (packet_size < 0)
 229         av_abort();
 230
 231     if (av_new_packet(pkt, packet_size) < 0)
 232         return -EIO;
 233
 234     pkt->stream_index = 0;
 235     ret = get_buffer(&s->pb, pkt->data, pkt->size);
 236     if (ret != pkt->size) {
 237         av_free_packet(pkt);
 238         return -EIO;
 239     } else {
 240         return 0;
 241     }
 242 }
 243
 244 static int yuv4_read_close(AVFormatContext *s)
 245 {
 246     return 0;
 247 }
 248
 249 AVInputFormat yuv4mpegpipe_iformat = {
 250     "yuv4mpegpipe",
 251     "YUV4MPEG pipe format",
 252     0,
 253     NULL,
 254     yuv4_read_header,
 255     yuv4_read_packet,
 256     yuv4_read_close,
 257     .extensions = "yuv4mpeg"
 258 };
 259
 260 int yuv4mpeg_init(void)
 261 {
 262     av_register_input_format(&yuv4mpegpipe_iformat);
 263 #ifdef CONFIG_ENCODERS
 264     av_register_output_format(&yuv4mpegpipe_oformat);
 265 #endif //CONFIG_ENCODERS
 266     return 0;
 267 }
 268