155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* replaygain tags parsing
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libavutil/avstring.h"
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#include "libavutil/dict.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/mem.h"
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#include "libavutil/replaygain.h"
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#include "avformat.h"
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#include "replaygain.h"
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static int32_t parse_gain(const char *gain)
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{
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char *fraction;
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int scale = 10000;
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int32_t mb = 0;
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int db;
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if (!gain)
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return INT32_MIN;
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gain += strspn(gain, " \t");
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db = strtol(gain, &fraction, 0);
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if (*fraction++ == '.') {
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while (av_isdigit(*fraction) && scale) {
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mb += scale * (*fraction - '0');
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scale /= 10;
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fraction++;
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}
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}
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if (abs(db) > (INT32_MAX - mb) / 100000)
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return INT32_MIN;
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return db * 100000 + FFSIGN(db) * mb;
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}
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static uint32_t parse_peak(const uint8_t *peak)
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{
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int64_t val = 0;
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int64_t scale = 1;
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if (!peak)
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return 0;
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peak += strspn(peak, " \t");
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if (peak[0] == '1' && peak[1] == '.')
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return UINT32_MAX;
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else if (!(peak[0] == '0' && peak[1] == '.'))
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return 0;
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peak += 2;
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while (av_isdigit(*peak)) {
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int digit = *peak - '0';
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if (scale > INT64_MAX / 10)
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break;
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val = 10 * val + digit;
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scale *= 10;
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peak++;
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}
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return av_rescale(val, UINT32_MAX, scale);
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}
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static int replaygain_export(AVStream *st,
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const uint8_t *track_gain, const uint8_t *track_peak,
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const uint8_t *album_gain, const uint8_t *album_peak)
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{
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AVPacketSideData *sd, *tmp;
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AVReplayGain *replaygain;
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uint8_t *data;
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int32_t tg, ag;
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uint32_t tp, ap;
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tg = parse_gain(track_gain);
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ag = parse_gain(album_gain);
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tp = parse_peak(track_peak);
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ap = parse_peak(album_peak);
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if (tg == INT32_MIN && ag == INT32_MIN)
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return 0;
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replaygain = av_mallocz(sizeof(*replaygain));
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if (!replaygain)
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return AVERROR(ENOMEM);
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tmp = av_realloc_array(st->side_data, st->nb_side_data + 1, sizeof(*tmp));
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if (!tmp) {
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av_freep(&replaygain);
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return AVERROR(ENOMEM);
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}
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st->side_data = tmp;
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st->nb_side_data++;
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sd = &st->side_data[st->nb_side_data - 1];
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sd->type = AV_PKT_DATA_REPLAYGAIN;
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sd->data = (uint8_t*)replaygain;
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sd->size = sizeof(*replaygain);
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replaygain->track_gain = tg;
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replaygain->track_peak = tp;
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replaygain->album_gain = ag;
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replaygain->album_peak = ap;
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return 0;
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}
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int ff_replaygain_export(AVStream *st, AVDictionary *metadata)
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{
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const AVDictionaryEntry *tg, *tp, *ag, *ap;
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tg = av_dict_get(metadata, "REPLAYGAIN_TRACK_GAIN", NULL, 0);
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tp = av_dict_get(metadata, "REPLAYGAIN_TRACK_PEAK", NULL, 0);
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ag = av_dict_get(metadata, "REPLAYGAIN_ALBUM_GAIN", NULL, 0);
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ap = av_dict_get(metadata, "REPLAYGAIN_ALBUM_PEAK", NULL, 0);
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return replaygain_export(st,
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tg ? tg->value : NULL,
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tp ? tp->value : NULL,
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ag ? ag->value : NULL,
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ap ? ap->value : NULL);
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}
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