/* * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; 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/replaygain.h" #include "avformat.h" #include "internal.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 (llabs(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; AVReplayGain *replaygain; if (tg == INT32_MIN && ag == INT32_MIN) return 0; sd = av_packet_side_data_new(&st->codecpar->coded_side_data, &st->codecpar->nb_coded_side_data, AV_PKT_DATA_REPLAYGAIN, sizeof(*replaygain), 0); if (!sd) return AVERROR(ENOMEM); replaygain = (AVReplayGain*)sd->data; 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)); }