From 2417652e9fbb2a4282909217fd53693bd7b7e11c Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sat, 27 Apr 2002 13:12:57 +0000
Subject: [PATCH] export mbskip_table for direct rendering add hurry_up support

Originally committed as revision 424 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/avcodec.h   | 9 +++++++--
 libavcodec/h263dec.c   | 5 +++++
 libavcodec/mpeg12.c    | 1 +
 libavcodec/mpegvideo.c | 3 +++
 libavcodec/mpegvideo.h | 3 +++
 5 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 8cb62ce..67a663e 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -5,8 +5,8 @@
 
 #define LIBAVCODEC_VERSION_INT 0x000406
 #define LIBAVCODEC_VERSION     "0.4.6"
-#define LIBAVCODEC_BUILD       4603
-#define LIBAVCODEC_BUILD_STR   "4603"
+#define LIBAVCODEC_BUILD       4604
+#define LIBAVCODEC_BUILD_STR   "4604"
 
 enum CodecID {
     CODEC_ID_NONE, 
@@ -141,6 +141,8 @@ typedef struct AVCodecContext {
     int key_frame;    /* true if the previous compressed frame was 
                          a key frame (intra, or seekable) */
     int delay;        /* number of frames the decoded output will be delayed relative to the encoded input */
+    uint8_t *mbskip_table; /* =1 if MB didnt change, is only valid for I/P frames 
+                              stride= mb_width = (width+15)>>4 */
     
     /* encoding parameters */
     int quality;      /* quality of the previous encoded frame 
@@ -157,6 +159,9 @@ typedef struct AVCodecContext {
     int rc_strategy;
     int b_frame_strategy;
 
+    int hurry_up;     /* when set to 1 during decoding, b frames will be skiped
+                         when set to 2 idct/dequant will be skipped too */
+    
     struct AVCodec *codec;
     void *priv_data;
 
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index 796e5ea..ebd8ff2 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -74,6 +74,7 @@ static int h263_decode_init(AVCodecContext *avctx)
         return -1;
     }
     s->codec_id= avctx->codec->id;
+    avctx->mbskip_table= s->mbskip_table;
     
     /* for h263, we allocate the images after having read the header */
     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
@@ -108,6 +109,8 @@ static int h263_decode_frame(AVCodecContext *avctx,
     printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
     printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 #endif
+
+    s->hurry_up= avctx->hurry_up;
     
     /* no supplementary picture */
     if (buf_size == 0) {
@@ -154,6 +157,8 @@ static int h263_decode_frame(AVCodecContext *avctx,
         return -1;
     /* skip b frames if we dont have reference frames */
     if(s->num_available_buffers<2 && s->pict_type==B_TYPE) return 0;
+    /* skip b frames if we are in a hurry */
+    if(s->hurry_up && s->pict_type==B_TYPE) return 0;
         
     MPV_frame_start(s);
 
diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index 18e0a53..4ba235c 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -1187,6 +1187,7 @@ static int mpeg_decode_init(AVCodecContext *avctx)
     s->mpeg_enc_ctx.picture_number = 0;
     s->repeat_field = 0;
     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
+    avctx->mbskip_table= s->mpeg_enc_ctx.mbskip_table;
     return 0;
 }
 
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index b216113..37fb97e 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1145,6 +1145,9 @@ static inline void put_dct(MpegEncContext *s,
 static inline void add_dct(MpegEncContext *s, 
                            DCTELEM *block, int i, UINT8 *dest, int line_size)
 {
+    /* skip dequant / idct if we are really late ;) */
+    if(s->hurry_up>1) return;
+
     if (s->block_last_index[i] >= 0) {
         if (!s->mpeg2)
             if(s->encoding || (!s->h263_msmpeg4))
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 22c8789..962e0c5 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -196,6 +196,9 @@ typedef struct MpegEncContext {
     int no_rounding; /* apply no rounding to motion compensation (MPEG4, msmpeg4, ...) 
                         for b-frames rounding mode is allways 0 */
 
+    int hurry_up;     /* when set to 1 during decoding, b frames will be skiped
+                         when set to 2 idct/dequant will be skipped too */
+
     /* macroblock layer */
     int mb_x, mb_y;
     int mb_incr;
-- 
2.7.4