| /* |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * replaygain tags parsing |
| */ |
| |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "libavutil/avstring.h" |
| #include "libavutil/dict.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/mathematics.h" |
| #include "libavutil/mem.h" |
| #include "libavutil/replaygain.h" |
| |
| #include "avformat.h" |
| #include "internal.h" |
| #include "replaygain.h" |
| |
| static int32_t parse_value(const char *value, int32_t min) |
| { |
| char *fraction; |
| int scale = 10000; |
| int32_t mb = 0; |
| int sign = 1; |
| int db; |
| |
| if (!value) |
| return min; |
| |
| value += strspn(value, " \t"); |
| |
| if (*value == '-') |
| sign = -1; |
| |
| db = strtol(value, &fraction, 0); |
| if (*fraction++ == '.') { |
| while (av_isdigit(*fraction) && scale) { |
| mb += scale * (*fraction - '0'); |
| scale /= 10; |
| fraction++; |
| } |
| } |
| |
| if (abs(db) > (INT32_MAX - mb) / 100000) |
| return min; |
| |
| return db * 100000 + sign * mb; |
| } |
| |
| int ff_replaygain_export_raw(AVStream *st, int32_t tg, uint32_t tp, |
| int32_t ag, uint32_t ap) |
| { |
| AVReplayGain *replaygain; |
| |
| if (tg == INT32_MIN && ag == INT32_MIN) |
| return 0; |
| |
| replaygain = (AVReplayGain*)av_stream_new_side_data(st, AV_PKT_DATA_REPLAYGAIN, |
| sizeof(*replaygain)); |
| if (!replaygain) |
| return AVERROR(ENOMEM); |
| |
| replaygain->track_gain = tg; |
| replaygain->track_peak = tp; |
| replaygain->album_gain = ag; |
| replaygain->album_peak = ap; |
| |
| return 0; |
| } |
| |
| int ff_replaygain_export(AVStream *st, AVDictionary *metadata) |
| { |
| const AVDictionaryEntry *tg, *tp, *ag, *ap; |
| |
| tg = av_dict_get(metadata, "REPLAYGAIN_TRACK_GAIN", NULL, 0); |
| tp = av_dict_get(metadata, "REPLAYGAIN_TRACK_PEAK", NULL, 0); |
| ag = av_dict_get(metadata, "REPLAYGAIN_ALBUM_GAIN", NULL, 0); |
| ap = av_dict_get(metadata, "REPLAYGAIN_ALBUM_PEAK", NULL, 0); |
| |
| return ff_replaygain_export_raw(st, |
| parse_value(tg ? tg->value : NULL, INT32_MIN), |
| parse_value(tp ? tp->value : NULL, 0), |
| parse_value(ag ? ag->value : NULL, INT32_MIN), |
| parse_value(ap ? ap->value : NULL, 0)); |
| } |