[FFmpeg-devel] [PATCH] rawdec: support AVRn 1:1 raw interlaced mode

[Michael Niedermayer]

    On Sat, Aug 18, 2012 at 04:03:54AM +0200, Michael Niedermayer wrote:
> Fixes Ticket971
> 
> Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> ---

a whitespaceless diff for easy review is below:
@@ -39,6 +39,7 @@ typedef struct RawVideoContext {
     unsigned char * buffer;  /* block of memory for holding one frame */
     int             length;  /* number of bytes in buffer */
     int flip;
+    int interlace;
     AVFrame pic;             ///< AVCodecContext.coded_frame
     int tff;
 } RawVideoContext;
@@ -130,6 +131,15 @@ static av_cold int raw_init_decoder(AVCodecContext *avctx)
         avctx->codec_tag == MKTAG(3, 0, 0, 0) || avctx->codec_tag == MKTAG('W','R','A','W'))
         context->flip=1;

+    if(avctx->extradata_size >= 9 && avctx->extradata[4] < avctx->extradata_size - 9 && !context->buffer && avctx->pix_fmt == PIX_FMT_UYVY422) {
+        context->interlace = !memcmp(avctx->extradata + avctx->extradata[4]+4, "1:1(", 4);
+        if(context->interlace) {
+            context->buffer = av_malloc(context->length);
+            if (!context->buffer)
+                return AVERROR(ENOMEM);
+        }
+    }
+
     return 0;
 }

@@ -162,7 +172,8 @@ static int raw_decode(AVCodecContext *avctx,
     if(context->tff>=0){
         frame->interlaced_frame = 1;
         frame->top_field_first  = context->tff;
-    }
+    }else if(context->interlace)
+        frame->interlaced_frame = 1;

     if (avctx->width <= 0 || avctx->height <= 0) {
         av_log(avctx, AV_LOG_ERROR, "w/h is invalid\n");
@@ -173,6 +184,7 @@ static int raw_decode(AVCodecContext *avctx,
     if (context->buffer) {
         int i;
         uint8_t *dst = context->buffer;
+        if(avctx->pix_fmt == PIX_FMT_PAL8){
         buf_size = context->length - AVPALETTE_SIZE;
         if (avctx->bits_per_coded_sample == 4){
             for(i=0; 2*i+1 < buf_size && i<avpkt->size; i++){
@@ -190,6 +202,22 @@ static int raw_decode(AVCodecContext *avctx,
             }
             linesize_align = 16;
         }
+        } else if(context->interlace && avctx->pix_fmt == PIX_FMT_UYVY422) {
+            int x, y;
+            int true_height = buf_size / (2*avctx->width);
+            av_assert0(avctx->height * avctx->width * 2 == context->length);
+            if (buf_size < context->length) {
+                av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < context length %d\n", buf_size, context->length);
+                return AVERROR(EINVAL);
+            }
+            buf += (true_height - avctx->height)*avctx->width;
+            for(y = 0; y < avctx->height-1; y+=2) {
+                memcpy(dst + (y+1)*2*avctx->width, buf                             , 2*avctx->width);
+                memcpy(dst + (y+0)*2*avctx->width, buf + avctx->width*true_height+4, 2*avctx->width);
+                buf += 2*avctx->width;
+            }
+        }else
+            av_assert0(0);
         buf= dst;
     }

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

There will always be a question for which you do not know the correct awnser.
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