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 int ff_replaygain_export_raw(AVStream
*st
, int32_t tg
, uint32_t tp
,
70 int32_t ag
, uint32_t ap
)
72 AVPacketSideData
*sd
, *tmp
;
73 AVReplayGain
*replaygain
;
76 if (tg
== INT32_MIN
&& ag
== INT32_MIN
)
79 for (i
= 0; i
< st
->nb_side_data
; i
++) {
80 AVPacketSideData
*src_sd
= &st
->side_data
[i
];
82 if (src_sd
->type
== AV_PKT_DATA_REPLAYGAIN
)
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 ff_replaygain_export_raw(st
,
121 parse_value(tg
? tg
->value
: NULL
, INT32_MIN
),
122 parse_value(tp
? tp
->value
: NULL
, 0),
123 parse_value(ag
? ag
->value
: NULL
, INT32_MIN
),
124 parse_value(ap
? ap
->value
: NULL
, 0));