| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * This file is part of FFmpeg. | ||
| 3 | * | ||
| 4 | * FFmpeg is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU Lesser General Public | ||
| 6 | * License as published by the Free Software Foundation; either | ||
| 7 | * version 2.1 of the License, or (at your option) any later version. | ||
| 8 | * | ||
| 9 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 | * Lesser General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU Lesser General Public | ||
| 15 | * License along with FFmpeg; if not, write to the Free Software | ||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 17 | */ | ||
| 18 | |||
| 19 | #ifndef AVUTIL_VIDEO_ENC_PARAMS_H | ||
| 20 | #define AVUTIL_VIDEO_ENC_PARAMS_H | ||
| 21 | |||
| 22 | #include <stddef.h> | ||
| 23 | #include <stdint.h> | ||
| 24 | |||
| 25 | #include "libavutil/avassert.h" | ||
| 26 | #include "libavutil/frame.h" | ||
| 27 | |||
| 28 | enum AVVideoEncParamsType { | ||
| 29 | AV_VIDEO_ENC_PARAMS_NONE = -1, | ||
| 30 | /** | ||
| 31 | * VP9 stores: | ||
| 32 | * - per-frame base (luma AC) quantizer index, exported as AVVideoEncParams.qp | ||
| 33 | * - deltas for luma DC, chroma AC and chroma DC, exported in the | ||
| 34 | * corresponding entries in AVVideoEncParams.delta_qp | ||
| 35 | * - per-segment delta, exported as for each block as AVVideoBlockParams.delta_qp | ||
| 36 | * | ||
| 37 | * To compute the resulting quantizer index for a block: | ||
| 38 | * - for luma AC, add the base qp and the per-block delta_qp, saturating to | ||
| 39 | * unsigned 8-bit. | ||
| 40 | * - for luma DC and chroma AC/DC, add the corresponding | ||
| 41 | * AVVideoBlockParams.delta_qp to the luma AC index, again saturating to | ||
| 42 | * unsigned 8-bit. | ||
| 43 | */ | ||
| 44 | AV_VIDEO_ENC_PARAMS_VP9, | ||
| 45 | |||
| 46 | /** | ||
| 47 | * H.264 stores: | ||
| 48 | * - in PPS (per-picture): | ||
| 49 | * * initial QP_Y (luma) value, exported as AVVideoEncParams.qp | ||
| 50 | * * delta(s) for chroma QP values (same for both, or each separately), | ||
| 51 | * exported as in the corresponding entries in AVVideoEncParams.delta_qp | ||
| 52 | * - per-slice QP delta, not exported directly, added to the per-MB value | ||
| 53 | * - per-MB delta; not exported directly; the final per-MB quantizer | ||
| 54 | * parameter - QP_Y - minus the value in AVVideoEncParams.qp is exported | ||
| 55 | * as AVVideoBlockParams.qp_delta. | ||
| 56 | */ | ||
| 57 | AV_VIDEO_ENC_PARAMS_H264, | ||
| 58 | |||
| 59 | /* | ||
| 60 | * MPEG-2-compatible quantizer. | ||
| 61 | * | ||
| 62 | * Summing the frame-level qp with the per-block delta_qp gives the | ||
| 63 | * resulting quantizer for the block. | ||
| 64 | */ | ||
| 65 | AV_VIDEO_ENC_PARAMS_MPEG2, | ||
| 66 | }; | ||
| 67 | |||
| 68 | /** | ||
| 69 | * Video encoding parameters for a given frame. This struct is allocated along | ||
| 70 | * with an optional array of per-block AVVideoBlockParams descriptors. | ||
| 71 | * Must be allocated with av_video_enc_params_alloc(). | ||
| 72 | */ | ||
| 73 | typedef struct AVVideoEncParams { | ||
| 74 | /** | ||
| 75 | * Number of blocks in the array. | ||
| 76 | * | ||
| 77 | * May be 0, in which case no per-block information is present. In this case | ||
| 78 | * the values of blocks_offset / block_size are unspecified and should not | ||
| 79 | * be accessed. | ||
| 80 | */ | ||
| 81 | unsigned int nb_blocks; | ||
| 82 | /** | ||
| 83 | * Offset in bytes from the beginning of this structure at which the array | ||
| 84 | * of blocks starts. | ||
| 85 | */ | ||
| 86 | size_t blocks_offset; | ||
| 87 | /* | ||
| 88 | * Size of each block in bytes. May not match sizeof(AVVideoBlockParams). | ||
| 89 | */ | ||
| 90 | size_t block_size; | ||
| 91 | |||
| 92 | /** | ||
| 93 | * Type of the parameters (the codec they are used with). | ||
| 94 | */ | ||
| 95 | enum AVVideoEncParamsType type; | ||
| 96 | |||
| 97 | /** | ||
| 98 | * Base quantisation parameter for the frame. The final quantiser for a | ||
| 99 | * given block in a given plane is obtained from this value, possibly | ||
| 100 | * combined with {@code delta_qp} and the per-block delta in a manner | ||
| 101 | * documented for each type. | ||
| 102 | */ | ||
| 103 | int32_t qp; | ||
| 104 | |||
| 105 | /** | ||
| 106 | * Quantisation parameter offset from the base (per-frame) qp for a given | ||
| 107 | * plane (first index) and AC/DC coefficients (second index). | ||
| 108 | */ | ||
| 109 | int32_t delta_qp[4][2]; | ||
| 110 | } AVVideoEncParams; | ||
| 111 | |||
| 112 | /** | ||
| 113 | * Data structure for storing block-level encoding information. | ||
| 114 | * It is allocated as a part of AVVideoEncParams and should be retrieved with | ||
| 115 | * av_video_enc_params_block(). | ||
| 116 | * | ||
| 117 | * sizeof(AVVideoBlockParams) is not a part of the ABI and new fields may be | ||
| 118 | * added to it. | ||
| 119 | */ | ||
| 120 | typedef struct AVVideoBlockParams { | ||
| 121 | /** | ||
| 122 | * Distance in luma pixels from the top-left corner of the visible frame | ||
| 123 | * to the top-left corner of the block. | ||
| 124 | * Can be negative if top/right padding is present on the coded frame. | ||
| 125 | */ | ||
| 126 | int src_x, src_y; | ||
| 127 | /** | ||
| 128 | * Width and height of the block in luma pixels. | ||
| 129 | */ | ||
| 130 | int w, h; | ||
| 131 | |||
| 132 | /** | ||
| 133 | * Difference between this block's final quantization parameter and the | ||
| 134 | * corresponding per-frame value. | ||
| 135 | */ | ||
| 136 | int32_t delta_qp; | ||
| 137 | } AVVideoBlockParams; | ||
| 138 | |||
| 139 | /** | ||
| 140 | * Get the block at the specified {@code idx}. Must be between 0 and nb_blocks - 1. | ||
| 141 | */ | ||
| 142 | static av_always_inline AVVideoBlockParams* | ||
| 143 | 31029 | av_video_enc_params_block(AVVideoEncParams *par, unsigned int idx) | |
| 144 | { | ||
| 145 |
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31029 | av_assert0(idx < par->nb_blocks); |
| 146 | 62058 | return (AVVideoBlockParams *)((uint8_t *)par + par->blocks_offset + | |
| 147 | 31029 | idx * par->block_size); | |
| 148 | } | ||
| 149 | |||
| 150 | /** | ||
| 151 | * Allocates memory for AVVideoEncParams of the given type, plus an array of | ||
| 152 | * {@code nb_blocks} AVVideoBlockParams and initializes the variables. Can be | ||
| 153 | * freed with a normal av_free() call. | ||
| 154 | * | ||
| 155 | * @param out_size if non-NULL, the size in bytes of the resulting data array is | ||
| 156 | * written here. | ||
| 157 | */ | ||
| 158 | AVVideoEncParams *av_video_enc_params_alloc(enum AVVideoEncParamsType type, | ||
| 159 | unsigned int nb_blocks, size_t *out_size); | ||
| 160 | |||
| 161 | /** | ||
| 162 | * Allocates memory for AVEncodeInfoFrame plus an array of | ||
| 163 | * {@code nb_blocks} AVEncodeInfoBlock in the given AVFrame {@code frame} | ||
| 164 | * as AVFrameSideData of type AV_FRAME_DATA_VIDEO_ENC_PARAMS | ||
| 165 | * and initializes the variables. | ||
| 166 | */ | ||
| 167 | AVVideoEncParams* | ||
| 168 | av_video_enc_params_create_side_data(AVFrame *frame, enum AVVideoEncParamsType type, | ||
| 169 | unsigned int nb_blocks); | ||
| 170 | |||
| 171 | #endif /* AVUTIL_VIDEO_ENC_PARAMS_H */ | ||
| 172 |