added draw_horiz_band test

Originally committed as revision 98 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -8,7 +8,7 @@ enum CodecID {
     CODEC_ID_MP2,
     CODEC_ID_AC3,
     CODEC_ID_MJPEG,
-    CODEC_ID_OPENDIVX,
+    CODEC_ID_MPEG4,
     CODEC_ID_PCM,
     CODEC_ID_RAWVIDEO,
     CODEC_ID_MSMPEG4,
@@ -45,6 +45,11 @@ extern int motion_estimation_method;
 #define CODEC_FLAG_HQ     0x0001 /* high quality (non real time) encoding */
 #define CODEC_FLAG_QSCALE 0x0002 /* use fixed qscale */
 
+/* codec capabilities */
+
+/* decoder can use draw_horiz_band callback */
+#define CODEC_CAP_DRAW_HORIZ_BAND 0x0001
+
 #define FRAME_RATE_BASE 10000
 
 typedef struct AVCodecContext {
@@ -57,6 +62,15 @@ typedef struct AVCodecContext {
     int width, height;
     int gop_size; /* 0 = intra only */
     int pix_fmt;  /* pixel format, see PIX_FMT_xxx */
+
+    /* if non NULL, 'draw_horiz_band' is called by the libavcodec
+       decoder to draw an horizontal band. It improve cache usage. Not
+       all codecs can do that. You must check the codec capabilities
+       before */
+    void (*draw_horiz_band)(struct AVCodecContext *s,
+                            UINT8 **src_ptr, int linesize,
+                            int y, int width, int height);
+
     /* audio only */
     int sample_rate; /* samples per sec */
     int channels;
@@ -72,6 +86,7 @@ typedef struct AVCodecContext {
     void *priv_data;
 
     /* the following fields are ignored */
+    void *opaque;   /* can be used to carry app specific stuff */
     char codec_name[32];
     int codec_type; /* see CODEC_TYPE_xxx */
     int codec_id; /* see CODEC_ID_xxx */
@@ -88,6 +103,7 @@ typedef struct AVCodec {
     int (*close)(AVCodecContext *);
     int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, 
                   UINT8 *buf, int buf_size);
+    int capabilities;
     struct AVCodec *next;
 } AVCodec;
 
@@ -104,11 +120,11 @@ extern AVCodec h263_encoder;
 extern AVCodec h263p_encoder;
 extern AVCodec rv10_encoder;
 extern AVCodec mjpeg_encoder;
-extern AVCodec opendivx_encoder;
+extern AVCodec mpeg4_encoder;
 extern AVCodec msmpeg4_encoder;
 
 extern AVCodec h263_decoder;
-extern AVCodec opendivx_decoder;
+extern AVCodec mpeg4_decoder;
 extern AVCodec msmpeg4_decoder;
 extern AVCodec mpeg_decoder;
 extern AVCodec h263i_decoder;

libavcodec/h263dec.c

@@ -30,6 +30,7 @@ static int h263_decode_init(AVCodecContext *avctx)
     MpegEncContext *s = avctx->priv_data;
     int i;
 
+    s->avctx = avctx;
     s->out_format = FMT_H263;
 
     s->width = avctx->width;
@@ -39,7 +40,7 @@ static int h263_decode_init(AVCodecContext *avctx)
     switch(avctx->codec->id) {
     case CODEC_ID_H263:
         break;
-    case CODEC_ID_OPENDIVX:
+    case CODEC_ID_MPEG4:
         s->time_increment_bits = 4; /* default value for broken headers */
         s->h263_pred = 1;
         break;
@@ -148,6 +149,20 @@ static int h263_decode_frame(AVCodecContext *avctx,
             }
             MPV_decode_mb(s, s->block);
         }
+        if (avctx->draw_horiz_band) {
+            UINT8 *src_ptr[3];
+            int y, h, offset;
+            y = s->mb_y * 16;
+            h = s->height - y;
+            if (h > 16)
+                h = 16;
+            offset = y * s->linesize;
+            src_ptr[0] = s->current_picture[0] + offset;
+            src_ptr[1] = s->current_picture[1] + (offset >> 2);
+            src_ptr[2] = s->current_picture[2] + (offset >> 2);
+            avctx->draw_horiz_band(avctx, src_ptr, s->linesize,
+                                   y, s->width, h);
+        }
     }
 
     MPV_frame_end(s);
@@ -164,15 +179,16 @@ static int h263_decode_frame(AVCodecContext *avctx,
     return buf_size;
 }
 
-AVCodec opendivx_decoder = {
+AVCodec mpeg4_decoder = {
-    "opendivx",
+    "mpeg4",
     CODEC_TYPE_VIDEO,
-    CODEC_ID_OPENDIVX,
+    CODEC_ID_MPEG4,
     sizeof(MpegEncContext),
     h263_decode_init,
     NULL,
     h263_decode_end,
     h263_decode_frame,
+    CODEC_CAP_DRAW_HORIZ_BAND,
 };
 
 AVCodec h263_decoder = {
@@ -184,6 +200,7 @@ AVCodec h263_decoder = {
     NULL,
     h263_decode_end,
     h263_decode_frame,
+    CODEC_CAP_DRAW_HORIZ_BAND,
 };
 
 AVCodec msmpeg4_decoder = {
@@ -195,6 +212,7 @@ AVCodec msmpeg4_decoder = {
     NULL,
     h263_decode_end,
     h263_decode_frame,
+    CODEC_CAP_DRAW_HORIZ_BAND,
 };
 
 AVCodec h263i_decoder = {
@@ -206,5 +224,6 @@ AVCodec h263i_decoder = {
     NULL,
     h263_decode_end,
     h263_decode_frame,
+    CODEC_CAP_DRAW_HORIZ_BAND,
 };