#include "vid_sim.h"#include "video_codec.h"#include <math.h>Go to the source code of this file.
Functions | |
| void | InitializeRateControl () |
| void | UpdateRateControl (int bits) |
| int | InitializeQuantizer (int pict_type, float bit_rate, float target_frame_rate, float QP_mean) |
| int | UpdateQuantizer (int mb, float QP_mean, int pict_type, float bit_rate, int mb_width, int mb_height, int bitcount) |
Variables | |
| video_codec * | VidSt |
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Definition at line 95 of file vid_ratectrl.c. References video_codec::B_prev, video_codec::B_target, video_codec::global_adj, mmax, mmin, and VidSt. Referenced by CodeOneOrTwo(). 00100 : */ 00101 /* int bitcount; */ 00102 /* AddBitsPicture(bits); */ 00103 /* bitcount = bits->total; */ 00104 00105 { 00106 int newQP; 00107 00108 if (pict_type == PCT_INTER) { 00109 00110 (VidSt->B_target) = bit_rate / target_frame_rate; 00111 00112 /* compute picture buffer descrepency as of the previous picture */ 00113 00114 if ((VidSt->B_prev) != 0.0) { 00115 (VidSt->global_adj) = ((VidSt->B_prev) - (VidSt->B_target)) / (2*(VidSt->B_target)); 00116 } 00117 else { 00118 (VidSt->global_adj) = (float)0.0; 00119 } 00120 newQP = (int)(QP_mean * (1 + (VidSt->global_adj)) + (float)0.5); 00121 newQP = mmax(1,mmin(31,newQP)); 00122 } 00123 else if (pict_type == PCT_INTRA) { 00124 fprintf(stderr,"No need to call InititializeQuantizer() for Intra picture\n"); 00125 exit(-1); 00126 } 00127 else { 00128 fprintf(stderr,"Error (InitializePictureRate): picture type unkown.\n"); 00129 exit(-1); 00130 } 00131 #if 1 00132 printf("Global adj = %.2f\n", (VidSt->global_adj)); 00133 printf("meanQP = %.2f newQP = %d\n", QP_mean, newQP); 00134 #endif 00135 fprintf(stdout,"Target no. of bits: %.2f\n", (VidSt->B_target)); 00136 00137 return newQP; 00138 }
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Definition at line 85 of file vid_ratectrl.c. References video_codec::B_prev, and VidSt. Referenced by code_video().
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Definition at line 168 of file vid_ratectrl.c. References video_codec::B_target, bitcount(), video_codec::global_adj, mmax, mmin, and VidSt. Referenced by CodeOneOrTwo(). 00175 {
00176 int newQP=16;
00177 float local_adj, descrepency, projection;
00178
00179 if (pict_type == PCT_INTRA) {
00180 newQP = 16; /* Changed from newQP = 16;, BD 8/27/96 */
00181 }
00182 else if (pict_type == PCT_INTER) {
00183 /* compute expected buffer fullness */
00184
00185 projection = mb * ((VidSt->B_target) / (mb_width*mb_height));
00186
00187 /* measure descrepency between current fullness and projection */
00188 descrepency= (bitcount - projection);
00189
00190 /* scale */
00191
00192 local_adj = 12 * descrepency / bit_rate;
00193
00194 #if(0)
00195 printf("mb = %d\n",mb);
00196 printf("bit_count = %d projection = %.2f \n",bitcount,projection);
00197 printf("B_target = %.2f local_adj = %.2f \n",(VidSt->B_target),local_adj);
00198 #endif
00199
00200 newQP = (int)(QP_mean * (1 + (VidSt->global_adj) + local_adj) + 0.5);
00201
00202 /* the update equation for newQP in TMN4 document section 3.7 */
00203
00204 }
00205 else {
00206 fprintf(stderr,"Error (UpdateQuantizer): picture type unkown.\n");
00207 }
00208
00209 #if(0)
00210 printf("mb = %d newQP = %d \n",mb,newQP);
00211 #endif
00212
00213 newQP = mmax(1,mmin(31,newQP));
00214 return newQP;
00215 }
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Definition at line 90 of file vid_ratectrl.c. References video_codec::B_prev, and VidSt. Referenced by code_video().
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Definition at line 16 of file vid_wrapper.c. |
1.3.9.1