second try of improved lambda/qp guessing for motion estimation RD in first pass

Originally committed as revision 4785 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo.c

@@ -1594,6 +1594,7 @@ void MPV_frame_end(MpegEncContext *s)
     emms_c();
 
     s->last_pict_type    = s->pict_type;
+    s->last_lambda_for[s->pict_type]= s->current_picture_ptr->quality;
     if(s->pict_type!=B_TYPE){
         s->last_non_b_pict_type= s->pict_type;
     }
@@ -2204,7 +2205,7 @@ static int estimate_best_b_count(MpegEncContext *s){
             int is_p= i % (j+1) == j || i==s->max_b_frames;
 
             input[i+1].pict_type= is_p ? P_TYPE : B_TYPE;
-            input[i+1].quality= s->rc_context.last_qscale_for[input[i+1].pict_type];
+            input[i+1].quality= s->last_lambda_for[input[i+1].pict_type];
             out_size = avcodec_encode_video(c, outbuf, outbuf_size, &input[i+1]);
             rd += (out_size * lambda2) >> FF_LAMBDA_SHIFT;
         }
@@ -5398,12 +5399,10 @@ static void encode_picture(MpegEncContext *s, int picture_number)
         estimate_qp(s, 1);
         ff_get_2pass_fcode(s);
     }else if(!(s->flags & CODEC_FLAG_QSCALE)){
-        RateControlContext *rcc= &s->rc_context;
-
         if(s->pict_type==B_TYPE)
-            s->lambda= rcc->last_qscale_for[s->pict_type];
+            s->lambda= s->last_lambda_for[s->pict_type];
         else
-            s->lambda= rcc->last_qscale_for[rcc->last_non_b_pict_type];
+            s->lambda= s->last_lambda_for[s->last_non_b_pict_type];
         update_qscale(s);
     }
 

libavcodec/mpegvideo.h

@@ -374,6 +374,7 @@ typedef struct MpegEncContext {
     int last_non_b_pict_type;   ///< used for mpeg4 gmc b-frames & ratecontrol
     int dropable;
     int frame_rate_index;
+    int last_lambda_for[5];     ///< last lambda for a specific pict type
 
     /* motion compensation */
     int unrestricted_mv;        ///< mv can point outside of the coded picture

tests/ffmpeg.regression.ref

@@ -59,18 +59,18 @@ stddev:  7.99 PSNR:30.06 bytes:7602176
 7932708 ./data/a-huffyuv.avi
 799d3db687f6cdd7a837ec156efc171f *./data/out.yuv
 stddev:  0.00 PSNR:99.99 bytes:7602176
-cc4a9bf5046d4f471174800135867831 *./data/a-mpeg4-rc.avi
-824318 ./data/a-mpeg4-rc.avi
-df7de6d3ce1faf92393985485cdf287a *./data/out.yuv
-stddev: 10.41 PSNR:27.77 bytes:7602176
+d37d4d4b5acfffe3a01a72f51c162a82 *./data/a-mpeg4-rc.avi
+822270 ./data/a-mpeg4-rc.avi
+3ecd1afdaf2d691d01628737326dda35 *./data/out.yuv
+stddev: 10.41 PSNR:27.76 bytes:7602176
 81078d7852dfd6041ff17b5dc8ed0ffc *./data/a-mpeg4-adv.avi
 600240 ./data/a-mpeg4-adv.avi
 0b7935cee2070f3b838478cea6dc4b3c *./data/out.yuv
 stddev: 10.25 PSNR:27.90 bytes:7602176
-b0235e9bf3cf3867064b9ff21cda76de *./data/a-mpeg4-thread.avi
-764896 ./data/a-mpeg4-thread.avi
-d10f9ee6af493233f46a2ff2b178940a *./data/out.yuv
-stddev: 12.32 PSNR:26.30 bytes:7602176
+052f9e98112011ddc302b521e34d6385 *./data/a-mpeg4-thread.avi
+764686 ./data/a-mpeg4-thread.avi
+252d1e8cc1ee88eea693cebd6b4e7e53 *./data/out.yuv
+stddev: 12.32 PSNR:26.31 bytes:7602176
 88cfdda74f0488cf4a8324667a1ec9e8 *./data/a-mpeg4-Q.avi
 899452 ./data/a-mpeg4-Q.avi
 af59c063ed644c7dc4151a0a2debbddd *./data/out.yuv

tests/rotozoom.regression.ref

@@ -59,18 +59,18 @@ stddev:  5.34 PSNR:33.56 bytes:7602176
 6454196 ./data/a-huffyuv.avi
 dde5895817ad9d219f79a52d0bdfb001 *./data/out.yuv
 stddev:  0.00 PSNR:99.99 bytes:7602176
-95e95dfe42fce9cdbe72688e821022ca *./data/a-mpeg4-rc.avi
-227834 ./data/a-mpeg4-rc.avi
-2e02fa0261c21268d568ddde74f9431e *./data/out.yuv
-stddev:  4.26 PSNR:35.51 bytes:7602176
+8375752d50a0a11c85370eebfb601d5d *./data/a-mpeg4-rc.avi
+227618 ./data/a-mpeg4-rc.avi
+addcb0b8e42d71c25a0590d10e8e41c6 *./data/out.yuv
+stddev:  4.27 PSNR:35.51 bytes:7602176
 49bb293a098ebf88870f663d590a02d9 *./data/a-mpeg4-adv.avi
 172526 ./data/a-mpeg4-adv.avi
 e3445dab9a3fa83a0f86457e24cb0cea *./data/out.yuv
 stddev:  4.84 PSNR:34.42 bytes:7602176
-66de0faff3660a0893996b39742a4c02 *./data/a-mpeg4-thread.avi
-253428 ./data/a-mpeg4-thread.avi
-0f23dbeb37f14b71cfae86dfe6c0b0e4 *./data/out.yuv
-stddev:  4.05 PSNR:35.96 bytes:7602176
+4b88839dd9696ff5500bea89b9ca66be *./data/a-mpeg4-thread.avi
+253268 ./data/a-mpeg4-thread.avi
+d6f1714d6fe1f969fc4ca416c6f8ba6c *./data/out.yuv
+stddev:  4.04 PSNR:35.98 bytes:7602176
 bb7f7889f0694a1c499041f3ee5e234d *./data/a-mpeg4-Q.avi
 164998 ./data/a-mpeg4-Q.avi
 b078f22c66083f0537bd3581509684d8 *./data/out.yuv