mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
ae43c10e36
This adds a function to export raw replaygain values (i.e. in the (u)int32_t form). It first checks whether AV_PKT_DATA_REPLAYGAIN side data is present, in which case it does nothing. Signed-off-by: Anton Khirnov <anton@khirnov.net>
125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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 "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)
|
|
{
|
|
AVPacketSideData *sd, *tmp;
|
|
AVReplayGain *replaygain;
|
|
|
|
if (tg == INT32_MIN && ag == INT32_MIN)
|
|
return 0;
|
|
|
|
for (int i = 0; i < st->nb_side_data; i++) {
|
|
AVPacketSideData *src_sd = &st->side_data[i];
|
|
|
|
if (src_sd->type == AV_PKT_DATA_REPLAYGAIN)
|
|
return 0;
|
|
}
|
|
|
|
replaygain = av_mallocz(sizeof(*replaygain));
|
|
if (!replaygain)
|
|
return AVERROR(ENOMEM);
|
|
|
|
tmp = av_realloc_array(st->side_data, st->nb_side_data + 1, sizeof(*tmp));
|
|
if (!tmp) {
|
|
av_freep(&replaygain);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
st->side_data = tmp;
|
|
st->nb_side_data++;
|
|
|
|
sd = &st->side_data[st->nb_side_data - 1];
|
|
sd->type = AV_PKT_DATA_REPLAYGAIN;
|
|
sd->data = (uint8_t*)replaygain;
|
|
sd->size = sizeof(*replaygain);
|
|
|
|
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));
|
|
}
|