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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  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.
  8.  *
  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.
  13.  *
  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
  17.  */
  18.  
  19. /**
  20.  * @file
  21.  * replaygain tags parsing
  22.  */
  23.  
  24. #include <stdint.h>
  25. #include <stdlib.h>
  26. #include <string.h>
  27.  
  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"
  34.  
  35. #include "avformat.h"
  36. #include "internal.h"
  37. #include "replaygain.h"
  38.  
  39. static int32_t parse_value(const char *value, int32_t min)
  40. {
  41.     char *fraction;
  42.     int  scale = 10000;
  43.     int32_t mb = 0;
  44.     int sign   = 1;
  45.     int db;
  46.  
  47.     if (!value)
  48.         return min;
  49.  
  50.     value += strspn(value, " \t");
  51.  
  52.     if (*value == '-')
  53.         sign = -1;
  54.  
  55.     db = strtol(value, &fraction, 0);
  56.     if (*fraction++ == '.') {
  57.         while (av_isdigit(*fraction) && scale) {
  58.             mb += scale * (*fraction - '0');
  59.             scale /= 10;
  60.             fraction++;
  61.         }
  62.     }
  63.  
  64.     if (abs(db) > (INT32_MAX - mb) / 100000)
  65.         return min;
  66.  
  67.     return db * 100000 + sign * mb;
  68. }
  69.  
  70. int ff_replaygain_export_raw(AVStream *st, int32_t tg, uint32_t tp,
  71.                              int32_t ag, uint32_t ap)
  72. {
  73.     AVReplayGain *replaygain;
  74.  
  75.     if (tg == INT32_MIN && ag == INT32_MIN)
  76.         return 0;
  77.  
  78.     replaygain = (AVReplayGain*)ff_stream_new_side_data(st, AV_PKT_DATA_REPLAYGAIN,
  79.                                                         sizeof(*replaygain));
  80.     if (!replaygain)
  81.         return AVERROR(ENOMEM);
  82.  
  83.     replaygain->track_gain = tg;
  84.     replaygain->track_peak = tp;
  85.     replaygain->album_gain = ag;
  86.     replaygain->album_peak = ap;
  87.  
  88.     return 0;
  89. }
  90.  
  91. int ff_replaygain_export(AVStream *st, AVDictionary *metadata)
  92. {
  93.     const AVDictionaryEntry *tg, *tp, *ag, *ap;
  94.  
  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);
  99.  
  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));
  105. }
  106.