blob: 707d3cd4f1ad2863af10e420b98f533152b9f18a
| 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 | /** |
| 20 | * @file |
| 21 | * replaygain tags parsing |
| 22 | */ |
| 23 | |
| 24 | #include <stdint.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | |
| 28 | #include "libavutil/avstring.h" |
| 29 | #include "libavutil/dict.h" |
| 30 | #include "libavutil/intreadwrite.h" |
| 31 | #include "libavutil/mathematics.h" |
| 32 | #include "libavutil/mem.h" |
| 33 | #include "libavutil/replaygain.h" |
| 34 | |
| 35 | #include "avformat.h" |
| 36 | #include "internal.h" |
| 37 | #include "replaygain.h" |
| 38 | |
| 39 | static int32_t parse_value(const char *value, int32_t min) |
| 40 | { |
| 41 | char *fraction; |
| 42 | int scale = 10000; |
| 43 | int32_t mb = 0; |
| 44 | int sign = 1; |
| 45 | int db; |
| 46 | |
| 47 | if (!value) |
| 48 | return min; |
| 49 | |
| 50 | value += strspn(value, " \t"); |
| 51 | |
| 52 | if (*value == '-') |
| 53 | sign = -1; |
| 54 | |
| 55 | db = strtol(value, &fraction, 0); |
| 56 | if (*fraction++ == '.') { |
| 57 | while (av_isdigit(*fraction) && scale) { |
| 58 | mb += scale * (*fraction - '0'); |
| 59 | scale /= 10; |
| 60 | fraction++; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | if (abs(db) > (INT32_MAX - mb) / 100000) |
| 65 | return min; |
| 66 | |
| 67 | return db * 100000 + sign * mb; |
| 68 | } |
| 69 | |
| 70 | int ff_replaygain_export_raw(AVStream *st, int32_t tg, uint32_t tp, |
| 71 | int32_t ag, uint32_t ap) |
| 72 | { |
| 73 | AVReplayGain *replaygain; |
| 74 | |
| 75 | if (tg == INT32_MIN && ag == INT32_MIN) |
| 76 | return 0; |
| 77 | |
| 78 | replaygain = (AVReplayGain*)av_stream_new_side_data(st, AV_PKT_DATA_REPLAYGAIN, |
| 79 | sizeof(*replaygain)); |
| 80 | if (!replaygain) |
| 81 | return AVERROR(ENOMEM); |
| 82 | |
| 83 | replaygain->track_gain = tg; |
| 84 | replaygain->track_peak = tp; |
| 85 | replaygain->album_gain = ag; |
| 86 | replaygain->album_peak = ap; |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | int ff_replaygain_export(AVStream *st, AVDictionary *metadata) |
| 92 | { |
| 93 | const AVDictionaryEntry *tg, *tp, *ag, *ap; |
| 94 | |
| 95 | tg = av_dict_get(metadata, "REPLAYGAIN_TRACK_GAIN", NULL, 0); |
| 96 | tp = av_dict_get(metadata, "REPLAYGAIN_TRACK_PEAK", NULL, 0); |
| 97 | ag = av_dict_get(metadata, "REPLAYGAIN_ALBUM_GAIN", NULL, 0); |
| 98 | ap = av_dict_get(metadata, "REPLAYGAIN_ALBUM_PEAK", NULL, 0); |
| 99 | |
| 100 | return ff_replaygain_export_raw(st, |
| 101 | parse_value(tg ? tg->value : NULL, INT32_MIN), |
| 102 | parse_value(tp ? tp->value : NULL, 0), |
| 103 | parse_value(ag ? ag->value : NULL, INT32_MIN), |
| 104 | parse_value(ap ? ap->value : NULL, 0)); |
| 105 | } |
| 106 |