| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2014 Tim Walker <tdskywalker@gmail.com> | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public | ||
| 8 | * License as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include "downmix_info.h" | ||
| 22 | #include "frame.h" | ||
| 23 | #include "mem.h" | ||
| 24 | |||
| 25 | 746 | AVDownmixInfo *av_downmix_info_update_side_data(AVFrame *frame) | |
| 26 | { | ||
| 27 | AVFrameSideData *side_data; | ||
| 28 | |||
| 29 | 746 | side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_DOWNMIX_INFO); | |
| 30 | |||
| 31 |
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746 | if (!side_data) { |
| 32 | 745 | side_data = av_frame_new_side_data(frame, AV_FRAME_DATA_DOWNMIX_INFO, | |
| 33 | sizeof(AVDownmixInfo)); | ||
| 34 |
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745 | if (side_data) |
| 35 | 744 | memset(side_data->data, 0, sizeof(AVDownmixInfo)); | |
| 36 | } | ||
| 37 | |||
| 38 |
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746 | if (!side_data) |
| 39 | 1 | return NULL; | |
| 40 | |||
| 41 | 745 | return (AVDownmixInfo*)side_data->data; | |
| 42 | } | ||
| 43 | |||
| 44 | #define MAX_CHANNELS 64 | ||
| 45 | |||
| 46 | static const int type_map[] = { | ||
| 47 | [AV_DOWNMIX_TYPE_UNKNOWN] = 0, | ||
| 48 | [AV_DOWNMIX_TYPE_LORO] = 2, | ||
| 49 | [AV_DOWNMIX_TYPE_LTRT] = 2, | ||
| 50 | [AV_DOWNMIX_TYPE_DPLII] = 2, | ||
| 51 | }; | ||
| 52 | |||
| 53 | 39 | AVDownmixMatrix *av_downmix_matrix_alloc(enum AVDownmixType type, | |
| 54 | int in_ch_count, size_t *out_size) | ||
| 55 | { | ||
| 56 | struct TestStruct { | ||
| 57 | AVDownmixMatrix p; | ||
| 58 | AVDownmixCoeff b; | ||
| 59 | }; | ||
| 60 | 39 | const size_t coeffs_offset = offsetof(struct TestStruct, b); | |
| 61 | 39 | size_t size = coeffs_offset; | |
| 62 | unsigned int nb_coeffs; | ||
| 63 | AVDownmixMatrix *dc; | ||
| 64 | |||
| 65 |
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39 | if ((unsigned)type >= FF_ARRAY_ELEMS(type_map) || |
| 66 |
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39 | (unsigned)in_ch_count > MAX_CHANNELS) |
| 67 | ✗ | return NULL; | |
| 68 | |||
| 69 | 39 | nb_coeffs = type_map[type] * in_ch_count; | |
| 70 | 39 | size += sizeof(AVDownmixCoeff) * nb_coeffs; | |
| 71 | |||
| 72 | 39 | dc = av_mallocz(size); | |
| 73 |
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39 | if (!dc) |
| 74 | ✗ | return NULL; | |
| 75 | |||
| 76 | 39 | dc->downmix_type = type; | |
| 77 | 39 | dc->nb_coeffs = nb_coeffs; | |
| 78 | 39 | dc->in_ch_count = in_ch_count; | |
| 79 | 39 | dc->coeffs_offset = coeffs_offset; | |
| 80 | |||
| 81 |
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39 | if (out_size) |
| 82 | 39 | *out_size = size; | |
| 83 | |||
| 84 | 39 | return dc; | |
| 85 | } | ||
| 86 |