| |
| /*! |
| ************************************************************************************* |
| * \file rdpicdecision.c |
| * |
| * \brief |
| * Perform RD optimal decisions between multiple coded versions of the same picture |
| * |
| * \author |
| * Main contributors (see contributors.h for copyright, address and affiliation details) |
| * - Alexis Michael Tourapis <alexismt@ieee.org> |
| ************************************************************************************* |
| */ |
| |
| #include "global.h" |
| #include <math.h> |
| |
| |
| /*! |
| ************************************************************************ |
| * \brief |
| * RD decision between possible encoding cases |
| ************************************************************************ |
| */ |
| int rd_pic_decision(double snrY_version1, double snrY_version2, int bits_version1, int bits_version2, double lambda_picture) |
| { |
| double cost_version1, cost_version2; |
| |
| cost_version1 = (double) bits_version1 * lambda_picture + snrY_version1; |
| cost_version2 = (double) bits_version2 * lambda_picture + snrY_version2; |
| //printf("%d %d %.2f %.2f %.2f %.2f \n",bits_version1,bits_version2,snrY_version1,snrY_version2,cost_version1,cost_version2); |
| if (cost_version2 > cost_version1 || (cost_version2 == cost_version1 && snrY_version2 >= snrY_version1) ) |
| return (0); |
| else |
| return (1); |
| } |
| |
| /*! |
| ************************************************************************ |
| * \brief |
| * Picture Coding Decision |
| ************************************************************************ |
| */ |
| int picture_coding_decision (Picture *picture1, Picture *picture2, int qp) |
| { |
| double lambda_picture; |
| int spframe = (img->type == SP_SLICE); |
| int bframe = (img->type == B_SLICE); |
| double snr_picture1, snr_picture2; |
| int bit_picture1, bit_picture2; |
| |
| if (input->successive_Bframe) |
| lambda_picture = 0.68 * pow (2, (qp - SHIFT_QP) / 3.0) * (bframe || spframe ? 2 : 1); |
| else |
| lambda_picture = 0.68 * pow (2, (qp - SHIFT_QP) / 3.0); |
| |
| snr_picture1 = picture1->distortion_y + picture1->distortion_u + picture1->distortion_v; |
| snr_picture2 = picture2->distortion_y + picture2->distortion_u + picture2->distortion_v; |
| bit_picture2 = picture2->bits_per_picture ; |
| bit_picture1 = picture1->bits_per_picture; |
| |
| return rd_pic_decision(snr_picture1, snr_picture2, bit_picture1, bit_picture2, lambda_picture); |
| } |
| |
