/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with FFmpeg; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include <stdint.h> #include "libavutil/frame.h" #include "libavutil/mem.h" #include "libavutil/video_enc_params.h" #include "qp_table.h" int ff_qp_table_extract(AVFrame *frame, int8_t **table, int *table_w, int *table_h, enum AVVideoEncParamsType *qscale_type) { AVFrameSideData *sd; AVVideoEncParams *par; unsigned int mb_h = (frame->height + 15) / 16; unsigned int mb_w = (frame->width + 15) / 16; unsigned int nb_mb = mb_h * mb_w; unsigned int block_idx; *table = NULL; sd = av_frame_get_side_data(frame, AV_FRAME_DATA_VIDEO_ENC_PARAMS); if (!sd) return 0; par = (AVVideoEncParams*)sd->data; if (par->type != AV_VIDEO_ENC_PARAMS_MPEG2 || (par->nb_blocks != 0 && par->nb_blocks != nb_mb)) return AVERROR(ENOSYS); *table = av_malloc(nb_mb); if (!*table) return AVERROR(ENOMEM); if (table_w) *table_w = mb_w; if (table_h) *table_h = mb_h; if (qscale_type) *qscale_type = par->type; if (par->nb_blocks == 0) { memset(*table, par->qp, nb_mb); return 0; } for (block_idx = 0; block_idx < nb_mb; block_idx++) { AVVideoBlockParams *b = av_video_enc_params_block(par, block_idx); (*table)[block_idx] = par->qp + b->delta_qp; } return 0; }