2 * This file is part of Libav.
4 * Libav 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.
9 * Libav 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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * replaygain tags parsing
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"
37 #include "replaygain.h"
39 static int32_t parse_value(const char *value, int32_t min)
50 value += strspn(value, " \t");
55 db = strtol(value, &fraction, 0);
56 if (*fraction++ == '.') {
57 while (av_isdigit(*fraction) && scale) {
58 mb += scale * (*fraction - '0');
64 if (abs(db) > (INT32_MAX - mb) / 100000)
67 return db * 100000 + sign * mb;
70 int ff_replaygain_export_raw(AVStream *st, int32_t tg, uint32_t tp,
71 int32_t ag, uint32_t ap)
73 AVReplayGain *replaygain;
75 if (tg == INT32_MIN && ag == INT32_MIN)
78 replaygain = (AVReplayGain*)ff_stream_new_side_data(st, AV_PKT_DATA_REPLAYGAIN,
81 return AVERROR(ENOMEM);
83 replaygain->track_gain = tg;
84 replaygain->track_peak = tp;
85 replaygain->album_gain = ag;
86 replaygain->album_peak = ap;
91 int ff_replaygain_export(AVStream *st, AVDictionary *metadata)
93 const AVDictionaryEntry *tg, *tp, *ag, *ap;
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);
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));