2 * This file is part of FFmpeg.
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.
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.
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
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"
36 #include "replaygain.h"
38 static int32_t parse_value(const char *value, int32_t min)
49 value += strspn(value, " \t");
54 db = strtol(value, &fraction, 0);
55 if (*fraction++ == '.') {
56 while (av_isdigit(*fraction) && scale) {
57 mb += scale * (*fraction - '0');
63 if (abs(db) > (INT32_MAX - mb) / 100000)
66 return db * 100000 + sign * mb;
69 static int replaygain_export(AVStream *st,
70 const uint8_t *track_gain, const uint8_t *track_peak,
71 const uint8_t *album_gain, const uint8_t *album_peak)
73 AVPacketSideData *sd, *tmp;
74 AVReplayGain *replaygain;
78 tg = parse_value(track_gain, INT32_MIN);
79 ag = parse_value(album_gain, INT32_MIN);
80 tp = parse_value(track_peak, 0);
81 ap = parse_value(album_peak, 0);
83 if (tg == INT32_MIN && ag == INT32_MIN)
86 replaygain = av_mallocz(sizeof(*replaygain));
88 return AVERROR(ENOMEM);
90 tmp = av_realloc_array(st->side_data, st->nb_side_data + 1, sizeof(*tmp));
92 av_freep(&replaygain);
93 return AVERROR(ENOMEM);
98 sd = &st->side_data[st->nb_side_data - 1];
99 sd->type = AV_PKT_DATA_REPLAYGAIN;
100 sd->data = (uint8_t*)replaygain;
101 sd->size = sizeof(*replaygain);
103 replaygain->track_gain = tg;
104 replaygain->track_peak = tp;
105 replaygain->album_gain = ag;
106 replaygain->album_peak = ap;
111 int ff_replaygain_export(AVStream *st, AVDictionary *metadata)
113 const AVDictionaryEntry *tg, *tp, *ag, *ap;
115 tg = av_dict_get(metadata, "REPLAYGAIN_TRACK_GAIN", NULL, 0);
116 tp = av_dict_get(metadata, "REPLAYGAIN_TRACK_PEAK", NULL, 0);
117 ag = av_dict_get(metadata, "REPLAYGAIN_ALBUM_GAIN", NULL, 0);
118 ap = av_dict_get(metadata, "REPLAYGAIN_ALBUM_PEAK", NULL, 0);
120 return replaygain_export(st,
121 tg ? tg->value : NULL,
122 tp ? tp->value : NULL,
123 ag ? ag->value : NULL,
124 ap ? ap->value : NULL);