mirror of https://github.com/FFmpeg/FFmpeg.git
Anton Khirnov
11 years ago
parent
25b3258656
commit
5a7e35dd23
9 changed files with 256 additions and 2 deletions
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/*
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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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@ -0,0 +1,31 @@ |
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/*
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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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#ifndef AVFORMAT_REPLAYGAIN_H |
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#define AVFORMAT_REPLAYGAIN_H |
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#include "libavutil/dict.h" |
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#include "avformat.h" |
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/**
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* Parse replaygain tags and export them as per-stream side data. |
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*/ |
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int ff_replaygain_export(AVStream *st, AVDictionary *metadata); |
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#endif /* AVFORMAT_REPLAYGAIN_H */ |
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@ -0,0 +1,51 @@ |
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/*
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* |
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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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#ifndef AVUTIL_REPLAYGAIN_H |
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#define AVUTIL_REPLAYGAIN_H |
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#include <stdint.h> |
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/**
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* ReplayGain information (see |
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* http://wiki.hydrogenaudio.org/index.php?title=ReplayGain_1.0_specification).
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* The size of this struct is a part of the public ABI. |
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*/ |
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typedef struct AVReplayGain { |
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/**
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* Track replay gain in microbels (divide by 100000 to get the value in dB). |
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* Should be set to INT32_MIN when unknown. |
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*/ |
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int32_t track_gain; |
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/**
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* Peak track amplitude, with UINT32_MAX representing full scale. 0 when |
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* unknown. |
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*/ |
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uint32_t track_peak; |
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/**
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* Same as track_gain, but for the whole album. |
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*/ |
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int32_t album_gain; |
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/**
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* Same as track_peak, but for the whole album, |
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*/ |
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uint32_t album_peak; |
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} AVReplayGain; |
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#endif /* AVUTIL_REPLAYGAIN_H */ |
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