1/2 resolution decoding

Originally committed as revision 3507 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffmpeg.c

@@ -188,6 +188,8 @@ static int predictor = 0;
 static int video_profile = FF_PROFILE_UNKNOWN;
 static int video_level = FF_LEVEL_UNKNOWN;
 static int nsse_weight = 8;
+static int subpel_quality= 8;
+static int lowres= 0;
 extern int loop_input; /* currently a hack */
 
 static int gop_size = 12;
@@ -3148,6 +3150,8 @@ static void opt_output_file(const char *filename)
                 video_enc->profile= video_profile;
                 video_enc->level= video_level;
                 video_enc->nsse_weight= nsse_weight;
+                video_enc->me_subpel_quality= subpel_quality;
+                video_enc->lowres= lowres;
 
                 if(packet_size){
                     video_enc->rtp_mode= 1;
@@ -3840,6 +3844,8 @@ const OptionDef options[] = {
     { "vprofile", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&video_profile}, "profile", "" },
     { "vlevel", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&video_level}, "level", "" },
     { "nssew", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&nsse_weight}, "weight", "" },
+    { "subq", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&subpel_quality}, "", "" },
+    { "lowres", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&lowres}, "", "" },
 
     /* audio options */
     { "ab", HAS_ARG | OPT_AUDIO, {(void*)opt_audio_bitrate}, "set audio bitrate (in kbit/s)", "bitrate", },

ffplay.c

@@ -171,6 +171,8 @@ static int step = 0;
 static int thread_count = 1;
 static int workaround_bugs = 1;
 static int fast = 0;
+static int lowres = 0;
+static int idct = FF_IDCT_AUTO;
 
 /* current context */
 static int is_full_screen;
@@ -1173,6 +1175,8 @@ static int stream_component_open(VideoState *is, int stream_index)
     enc->debug_mv = debug_mv;
     enc->debug = debug;
     enc->workaround_bugs = workaround_bugs;
+    enc->lowres = lowres;
+    enc->idct_algo= idct;
     if(fast) enc->flags2 |= CODEC_FLAG2_FAST;
     if (!codec ||
         avcodec_open(enc, codec) < 0)
@@ -1832,6 +1836,8 @@ const OptionDef options[] = {
     { "bug", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&workaround_bugs}, "workaround bugs", "" },
     { "vismv", HAS_ARG | OPT_EXPERT, {(void*)opt_vismv}, "visualize motion vectors", "" },
     { "fast", OPT_BOOL | OPT_EXPERT, {(void*)&fast}, "non spec compliant optimizations", "" },
+    { "lowres", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&lowres}, "", "" },
+    { "idct", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&idct}, "set idct algo",  "algo" },
 #ifdef CONFIG_NETWORK
     { "rtp_tcp", OPT_EXPERT, {(void*)&opt_rtp_tcp}, "force RTP/TCP protocol usage", "" },
 #endif

libavcodec/avcodec.h

@@ -17,7 +17,7 @@ extern "C" {
 
 #define FFMPEG_VERSION_INT     0x000409
 #define FFMPEG_VERSION         "0.4.9-pre1"
-#define LIBAVCODEC_BUILD       4721
+#define LIBAVCODEC_BUILD       4722
 
 #define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
 #define LIBAVCODEC_VERSION     FFMPEG_VERSION
@@ -1111,6 +1111,7 @@ typedef struct AVCodecContext {
 #define FF_IDCT_ALTIVEC      8
 #define FF_IDCT_SH4          9
 #define FF_IDCT_SIMPLEARM    10
+#define FF_IDCT_INT4         11
 
     /**
      * slice count.
@@ -1656,6 +1657,13 @@ typedef struct AVCodecContext {
      */
      int level;
 #define FF_LEVEL_UNKNOWN -99
+
+    /**
+     * low resolution decoding. 1-> 1/2 size, 2->1/4 size
+     * - encoding: unused
+     * - decoding: set by user
+     */
+     int lowres;
 } AVCodecContext;
 
 

libavcodec/dsputil.c

@@ -446,6 +446,24 @@ static void put_pixels_clamped_c(const DCTELEM *block, uint8_t *restrict pixels,
     }
 }
 
+static void put_pixels_clamped4_c(const DCTELEM *block, uint8_t *restrict pixels,
+				 int line_size)
+{
+    int i;
+    uint8_t *cm = cropTbl + MAX_NEG_CROP;
+    
+    /* read the pixels */
+    for(i=0;i<4;i++) {
+        pixels[0] = cm[block[0]];
+        pixels[1] = cm[block[1]];
+        pixels[2] = cm[block[2]];
+        pixels[3] = cm[block[3]];
+
+        pixels += line_size;
+        block += 8;
+    }
+}
+
 static void put_signed_pixels_clamped_c(const DCTELEM *block, 
                                         uint8_t *restrict pixels,
                                         int line_size)
@@ -487,6 +505,23 @@ static void add_pixels_clamped_c(const DCTELEM *block, uint8_t *restrict pixels,
         block += 8;
     }
 }
+
+static void add_pixels_clamped4_c(const DCTELEM *block, uint8_t *restrict pixels,
+                          int line_size)
+{
+    int i;
+    uint8_t *cm = cropTbl + MAX_NEG_CROP;
+    
+    /* read the pixels */
+    for(i=0;i<4;i++) {
+        pixels[0] = cm[pixels[0] + block[0]];
+        pixels[1] = cm[pixels[1] + block[1]];
+        pixels[2] = cm[pixels[2] + block[2]];
+        pixels[3] = cm[pixels[3] + block[3]];
+        pixels += line_size;
+        block += 8;
+    }
+}
 #if 0
 
 #define PIXOP2(OPNAME, OP) \
@@ -3294,6 +3329,17 @@ static void ff_jref_idct_add(uint8_t *dest, int line_size, DCTELEM *block)
     add_pixels_clamped_c(block, dest, line_size);
 }
 
+static void ff_jref_idct4_put(uint8_t *dest, int line_size, DCTELEM *block)
+{
+    j_rev_dct4 (block);
+    put_pixels_clamped4_c(block, dest, line_size);
+}
+static void ff_jref_idct4_add(uint8_t *dest, int line_size, DCTELEM *block)
+{
+    j_rev_dct4 (block);
+    add_pixels_clamped4_c(block, dest, line_size);
+}
+
 /* init static data */
 void dsputil_static_init(void)
 {
@@ -3332,6 +3378,12 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
     }
 #endif //CONFIG_ENCODERS
 
+    if(avctx->lowres==1){
+        c->idct_put= ff_jref_idct4_put;
+        c->idct_add= ff_jref_idct4_add;
+        c->idct    = j_rev_dct4;
+        c->idct_permutation_type= FF_NO_IDCT_PERM;
+    }else{
         if(avctx->idct_algo==FF_IDCT_INT){
             c->idct_put= ff_jref_idct_put;
             c->idct_add= ff_jref_idct_add;
@@ -3343,6 +3395,7 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
             c->idct    = simple_idct;
             c->idct_permutation_type= FF_NO_IDCT_PERM;
         }
+    }
 
     /* VP3 DSP support */
     c->vp3_dsp_init = vp3_dsp_init_c;

libavcodec/dsputil.h

@@ -42,6 +42,7 @@ void ff_jpeg_fdct_islow (DCTELEM *data);
 void ff_fdct248_islow (DCTELEM *data);
 
 void j_rev_dct (DCTELEM *data);
+void j_rev_dct4 (DCTELEM *data);
 
 void ff_fdct_mmx(DCTELEM *block);
 void ff_fdct_mmx2(DCTELEM *block);

libavcodec/i386/dsputil_mmx.c

@@ -2984,7 +2984,7 @@ void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx)
             }
         }
 #endif //CONFIG_ENCODERS
-
+        if(avctx->lowres==0){
             if(idct_algo==FF_IDCT_AUTO || idct_algo==FF_IDCT_SIMPLEMMX){
                 c->idct_put= ff_simple_idct_put_mmx;
                 c->idct_add= ff_simple_idct_add_mmx;
@@ -3002,6 +3002,7 @@ void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx)
                 }
                 c->idct_permutation_type= FF_LIBMPEG2_IDCT_PERM;
             }
+        }
 
         /* VP3 optimized DSP functions */
         if (mm_flags & MM_SSE2) {

libavcodec/mpeg12.c

@@ -2409,6 +2409,7 @@ static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
     AVCodecContext *avctx= s->avctx;
     int ret;
     const int field_pic= s->picture_structure != PICT_FRAME;
+    const int lowres= s->avctx->lowres;
 
     s->resync_mb_x=
     s->resync_mb_y= -1;
@@ -2518,9 +2519,9 @@ static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
             }
         }
 
-        s->dest[0] += 16;
-        s->dest[1] += 16 >> s->chroma_x_shift;
-        s->dest[2] += 16 >> s->chroma_x_shift;
+        s->dest[0] += 16 >> lowres;
+        s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
+        s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
 
         MPV_decode_mb(s, s->block);
         

libavcodec/mpegvideo.h

@@ -773,15 +773,17 @@ extern enum PixelFormat ff_yuv420p_list[2];
 void ff_init_block_index(MpegEncContext *s);
 
 static inline void ff_update_block_index(MpegEncContext *s){
+    const int block_size= 8>>s->avctx->lowres;
+
     s->block_index[0]+=2;
     s->block_index[1]+=2;
     s->block_index[2]+=2;
     s->block_index[3]+=2;
     s->block_index[4]++;
     s->block_index[5]++;
-    s->dest[0]+= 16;
-    s->dest[1]+= 8;
-    s->dest[2]+= 8;
+    s->dest[0]+= 2*block_size;
+    s->dest[1]+= block_size;
+    s->dest[2]+= block_size;
 }
 
 static inline int get_bits_diff(MpegEncContext *s){