mpegvideo_parser: export pixel format and dimensions
authorAnton Khirnov <anton@khirnov.net>
Mon, 6 Jul 2015 19:53:13 +0000 (21:53 +0200)
committerAnton Khirnov <anton@khirnov.net>
Sun, 12 Jul 2015 16:15:39 +0000 (18:15 +0200)
libavcodec/mpegvideo_parser.c

index 620083f..37808c6 100644 (file)
@@ -44,6 +44,8 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
     int top_field_first, repeat_first_field, progressive_frame;
     int horiz_size_ext, vert_size_ext, bit_rate_ext;
     int did_set_size=0;
+    int chroma_format;
+    enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
 //FIXME replace the crap with get_bits()
     s->repeat_pict = 0;
 
@@ -65,6 +67,7 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
                     ff_set_dimensions(avctx, pc->width, pc->height);
                     did_set_size=1;
                 }
+                pix_fmt = AV_PIX_FMT_YUV420P;
                 frame_rate_index = buf[3] & 0xf;
                 pc->frame_rate = avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_index];
                 avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
@@ -85,6 +88,13 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
                         pc->progressive_sequence = buf[1] & (1 << 3);
                         avctx->has_b_frames= !(buf[5] >> 7);
 
+                        chroma_format = (buf[1] >> 1) & 3;
+                        switch (chroma_format) {
+                        case 1: pix_fmt = AV_PIX_FMT_YUV420P; break;
+                        case 2: pix_fmt = AV_PIX_FMT_YUV422P; break;
+                        case 3: pix_fmt = AV_PIX_FMT_YUV444P; break;
+                        }
+
                         pc->width  |=(horiz_size_ext << 12);
                         pc->height |=( vert_size_ext << 12);
                         avctx->bit_rate += (bit_rate_ext << 18) * 400;
@@ -138,6 +148,13 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
         }
     }
  the_end: ;
+
+    if (pix_fmt != AV_PIX_FMT_NONE) {
+        s->format = pix_fmt;
+        s->width  = s->coded_width  = pc->width;
+        s->height = s->coded_height = pc->height;
+    }
+
 #if FF_API_AVCTX_TIMEBASE
     if (avctx->framerate.num)
         avctx->time_base = av_inv_q(avctx->framerate);