| /* |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser 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 |
| */ |
| |
| #ifndef AVUTIL_VIDEO_ENC_PARAMS_H |
| #define AVUTIL_VIDEO_ENC_PARAMS_H |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/frame.h" |
| |
| enum AVVideoEncParamsType { |
| AV_VIDEO_ENC_PARAMS_NONE = -1, |
| /** |
| * VP9 stores: |
| * - per-frame base (luma AC) quantizer index, exported as AVVideoEncParams.qp |
| * - deltas for luma DC, chroma AC and chroma DC, exported in the |
| * corresponding entries in AVVideoEncParams.delta_qp |
| * - per-segment delta, exported as for each block as AVVideoBlockParams.delta_qp |
| * |
| * To compute the resulting quantizer index for a block: |
| * - for luma AC, add the base qp and the per-block delta_qp, saturating to |
| * unsigned 8-bit. |
| * - for luma DC and chroma AC/DC, add the corresponding |
| * AVVideoBlockParams.delta_qp to the luma AC index, again saturating to |
| * unsigned 8-bit. |
| */ |
| AV_VIDEO_ENC_PARAMS_VP9, |
| |
| /** |
| * H.264 stores: |
| * - in PPS (per-picture): |
| * * initial QP_Y (luma) value, exported as AVVideoEncParams.qp |
| * * delta(s) for chroma QP values (same for both, or each separately), |
| * exported as in the corresponding entries in AVVideoEncParams.delta_qp |
| * - per-slice QP delta, not exported directly, added to the per-MB value |
| * - per-MB delta; not exported directly; the final per-MB quantizer |
| * parameter - QP_Y - minus the value in AVVideoEncParams.qp is exported |
| * as AVVideoBlockParams.qp_delta. |
| */ |
| AV_VIDEO_ENC_PARAMS_H264, |
| }; |
| |
| /** |
| * Video encoding parameters for a given frame. This struct is allocated along |
| * with an optional array of per-block AVVideoBlockParams descriptors. |
| * Must be allocated with av_video_enc_params_alloc(). |
| */ |
| typedef struct AVVideoEncParams { |
| /** |
| * Number of blocks in the array. |
| * |
| * May be 0, in which case no per-block information is present. In this case |
| * the values of blocks_offset / block_size are unspecified and should not |
| * be accessed. |
| */ |
| unsigned int nb_blocks; |
| /** |
| * Offset in bytes from the beginning of this structure at which the array |
| * of blocks starts. |
| */ |
| size_t blocks_offset; |
| /* |
| * Size of each block in bytes. May not match sizeof(AVVideoBlockParams). |
| */ |
| size_t block_size; |
| |
| /** |
| * Type of the parameters (the codec they are used with). |
| */ |
| enum AVVideoEncParamsType type; |
| |
| /** |
| * Base quantisation parameter for the frame. The final quantiser for a |
| * given block in a given plane is obtained from this value, possibly |
| * combined with {@code delta_qp} and the per-block delta in a manner |
| * documented for each type. |
| */ |
| int32_t qp; |
| |
| /** |
| * Quantisation parameter offset from the base (per-frame) qp for a given |
| * plane (first index) and AC/DC coefficients (second index). |
| */ |
| int32_t delta_qp[4][2]; |
| } AVVideoEncParams; |
| |
| /** |
| * Data structure for storing block-level encoding information. |
| * It is allocated as a part of AVVideoEncParams and should be retrieved with |
| * av_video_enc_params_block(). |
| * |
| * sizeof(AVVideoBlockParams) is not a part of the ABI and new fields may be |
| * added to it. |
| */ |
| typedef struct AVVideoBlockParams { |
| /** |
| * Distance in luma pixels from the top-left corner of the visible frame |
| * to the top-left corner of the block. |
| * Can be negative if top/right padding is present on the coded frame. |
| */ |
| int src_x, src_y; |
| /** |
| * Width and height of the block in luma pixels. |
| */ |
| int w, h; |
| |
| /** |
| * Difference between this block's final quantization parameter and the |
| * corresponding per-frame value. |
| */ |
| int32_t delta_qp; |
| } AVVideoBlockParams; |
| |
| /* |
| * Get the block at the specified {@code idx}. Must be between 0 and nb_blocks. |
| */ |
| static av_always_inline AVVideoBlockParams* |
| av_video_enc_params_block(AVVideoEncParams *par, unsigned int idx) |
| { |
| av_assert0(idx < par->nb_blocks); |
| return (AVVideoBlockParams *)((uint8_t *)par + par->blocks_offset + |
| idx * par->block_size); |
| } |
| |
| /** |
| * Allocates memory for AVVideoEncParams of the given type, plus an array of |
| * {@code nb_blocks} AVVideoBlockParams and initializes the variables. Can be |
| * freed with a normal av_free() call. |
| * |
| * @param out_size if non-NULL, the size in bytes of the resulting data array is |
| * written here. |
| */ |
| AVVideoEncParams *av_video_enc_params_alloc(enum AVVideoEncParamsType type, |
| unsigned int nb_blocks, size_t *out_size); |
| |
| /** |
| * Allocates memory for AVEncodeInfoFrame plus an array of |
| * {@code nb_blocks} AVEncodeInfoBlock in the given AVFrame {@code frame} |
| * as AVFrameSideData of type AV_FRAME_DATA_VIDEO_ENC_PARAMS |
| * and initializes the variables. |
| */ |
| AVVideoEncParams* |
| av_video_enc_params_create_side_data(AVFrame *frame, enum AVVideoEncParamsType type, |
| unsigned int nb_blocks); |
| |
| #endif /* AVUTIL_VIDEO_ENC_PARAMS_H */ |