| 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 | #include "gain_map.h" | ||
| 20 | #include "mem.h" | ||
| 21 | |||
| 22 | 5 | static void gain_map_params_default(AVGainMapParams *p) | |
| 23 | { | ||
| 24 | 5 | *p = (AVGainMapParams) { | |
| 25 | .base_hdr_headroom = { 0, 1 }, | ||
| 26 | .alternate_hdr_headroom = { 0, 1 }, | ||
| 27 | .nb_channels = 1, | ||
| 28 | }; | ||
| 29 | |||
| 30 | /* Pre-fill all three channels as a convenience */ | ||
| 31 |
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20 | for (int c = 0; c < 3; c++) { |
| 32 | 15 | p->channels[c] = (struct AVGainMapChannel) { | |
| 33 | .gain_map_min = { 0, 1 }, | ||
| 34 | .gain_map_max = { 0, 1 }, | ||
| 35 | .gamma = { 1, 1 }, | ||
| 36 | .base_offset = { 1, 64 }, | ||
| 37 | .alternate_offset = { 1, 64 }, | ||
| 38 | }; | ||
| 39 | } | ||
| 40 | 5 | } | |
| 41 | |||
| 42 | #define CHECK(cond) do { if (!(cond)) return AVERROR_INVALIDDATA; } while (0) | ||
| 43 | #define CHECK_SIGNED(q) CHECK((q).den > 0); | ||
| 44 | #define CHECK_UNSIGNED(q) CHECK((q).num >= 0 && (q).den > 0); | ||
| 45 | |||
| 46 | 10 | int av_gain_map_params_validate(const AVGainMapParams *p) | |
| 47 | { | ||
| 48 |
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10 | CHECK(0 <= p->version && p->version <= AV_ISO21496_VERSION); |
| 49 |
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10 | CHECK(p->nb_channels == 1 || p->nb_channels == 3); |
| 50 |
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10 | CHECK_UNSIGNED(p->base_hdr_headroom); |
| 51 |
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10 | CHECK_UNSIGNED(p->alternate_hdr_headroom); |
| 52 | |||
| 53 |
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24 | for (int c = 0; c < p->nb_channels; c++) { |
| 54 | 14 | const struct AVGainMapChannel *const ch = &p->channels[c]; | |
| 55 |
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14 | CHECK_SIGNED(ch->gain_map_min); |
| 56 |
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14 | CHECK_SIGNED(ch->gain_map_max); |
| 57 |
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14 | CHECK_UNSIGNED(ch->gamma); |
| 58 |
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14 | CHECK(ch->gamma.num != 0); |
| 59 | /** | ||
| 60 | * Note: The ISO spec declares these as signed, but a negative value | ||
| 61 | * makes no numeric sense and would result in infinities in the | ||
| 62 | * middle of the valid signal range; so just constrain them to be | ||
| 63 | * unsigned as a safeguard. Note that the Adobe hdrgm spec explicitly | ||
| 64 | * requires them to be nonnegative as well, so this avoids an | ||
| 65 | * inconsistency. | ||
| 66 | */ | ||
| 67 |
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14 | CHECK_UNSIGNED(ch->base_offset); |
| 68 |
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14 | CHECK_UNSIGNED(ch->alternate_offset); |
| 69 |
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14 | CHECK(av_cmp_q(ch->gain_map_min, ch->gain_map_max) <= 0); |
| 70 | } | ||
| 71 | |||
| 72 | 10 | return 0; | |
| 73 | } | ||
| 74 | |||
| 75 | 1 | int av_gain_map_channels_identical(const AVGainMapParams *p) | |
| 76 | { | ||
| 77 | static_assert(sizeof(p->channels[0]) == sizeof(int[2]) * 5, | ||
| 78 | "AVGainMapChannel struct is tightly packed"); | ||
| 79 | |||
| 80 |
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1 | return !memcmp(&p->channels[0], &p->channels[1], sizeof(p->channels[0])) && |
| 81 | ✗ | !memcmp(&p->channels[0], &p->channels[2], sizeof(p->channels[0])); | |
| 82 | } | ||
| 83 | |||
| 84 | ✗ | AVGainMapParams *av_gain_map_params_alloc(size_t *size) | |
| 85 | { | ||
| 86 | ✗ | AVGainMapParams *p = av_malloc(sizeof(AVGainMapParams)); | |
| 87 | ✗ | if (!p) | |
| 88 | ✗ | return NULL; | |
| 89 | |||
| 90 | ✗ | gain_map_params_default(p); | |
| 91 | |||
| 92 | ✗ | if (size) | |
| 93 | ✗ | *size = sizeof(*p); | |
| 94 | |||
| 95 | ✗ | return p; | |
| 96 | } | ||
| 97 | |||
| 98 | 5 | AVGainMapParams *av_gain_map_params_create_side_data(AVFrameSideData ***fsd, int *nb_sd) | |
| 99 | { | ||
| 100 | AVFrameSideData *sd; | ||
| 101 | 5 | sd = av_frame_side_data_new(fsd, nb_sd, AV_FRAME_DATA_GAIN_MAP_PARAMS, | |
| 102 | sizeof(AVGainMapParams), | ||
| 103 | AV_FRAME_SIDE_DATA_FLAG_REPLACE); | ||
| 104 |
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5 | if (!sd) |
| 105 | ✗ | return NULL; | |
| 106 | |||
| 107 | 5 | AVGainMapParams *const p = (AVGainMapParams *) sd->data; | |
| 108 | 5 | gain_map_params_default(p); | |
| 109 | 5 | return p; | |
| 110 | } | ||
| 111 |