mirror of https://github.com/FFmpeg/FFmpeg.git
124 lines
4.3 KiB
C
124 lines
4.3 KiB
C
/*
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* VorbisComment writer
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* Copyright (c) 2009 James Darnley
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "avio.h"
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#include "avio_internal.h"
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#include "avformat.h"
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#include "metadata.h"
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#include "vorbiscomment.h"
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#include "libavutil/dict.h"
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/**
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* VorbisComment metadata conversion mapping.
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* from Ogg Vorbis I format specification: comment field and header specification
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* http://xiph.org/vorbis/doc/v-comment.html
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*/
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const AVMetadataConv ff_vorbiscomment_metadata_conv[] = {
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{ "ALBUMARTIST", "album_artist"},
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{ "TRACKNUMBER", "track" },
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{ "DISCNUMBER", "disc" },
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{ "DESCRIPTION", "comment" },
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{ 0 }
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};
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int ff_vorbiscomment_length(const AVDictionary *m, const char *vendor_string,
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AVChapter **chapters, unsigned int nb_chapters)
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{
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AVIOContext *avio_buf;
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int ret, len;
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ret = ffio_open_null_buf(&avio_buf);
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if (ret < 0)
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return ret;
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ret = ff_vorbiscomment_write(avio_buf, m, vendor_string, chapters, nb_chapters);
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len = ffio_close_null_buf(avio_buf);
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if (ret < 0)
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return ret;
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return len;
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}
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int ff_vorbiscomment_write(AVIOContext *pb, const AVDictionary *m,
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const char *vendor_string,
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AVChapter **chapters, unsigned int nb_chapters)
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{
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size_t vendor_string_length = strlen(vendor_string);
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int cm_count = 0;
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avio_wl32(pb, vendor_string_length);
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avio_write(pb, vendor_string, vendor_string_length);
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/* Vorbis comment only supports 1000 chapters */
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if (nb_chapters > 1000)
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nb_chapters = 1000;
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if (chapters && nb_chapters) {
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for (int i = 0; i < nb_chapters; i++) {
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cm_count += av_dict_count(chapters[i]->metadata) + 1;
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}
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}
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if (m) {
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int count = av_dict_count(m) + cm_count;
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const AVDictionaryEntry *tag = NULL;
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avio_wl32(pb, count);
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while ((tag = av_dict_iterate(m, tag))) {
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int64_t len1 = strlen(tag->key);
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int64_t len2 = strlen(tag->value);
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if (len1+1+len2 > UINT32_MAX)
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return AVERROR(EINVAL);
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avio_wl32(pb, len1 + 1 + len2);
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avio_write(pb, tag->key, len1);
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avio_w8(pb, '=');
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avio_write(pb, tag->value, len2);
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}
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for (int i = 0; i < nb_chapters; i++) {
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AVChapter *chp = chapters[i];
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char chapter_time[64];
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int h, m, s, ms, len;
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s = av_rescale(chp->start, chp->time_base.num, chp->time_base.den);
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h = s / 3600;
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m = (s / 60) % 60;
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ms = av_rescale_q(chp->start, chp->time_base, av_make_q( 1, 1000)) % 1000;
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s = s % 60;
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len = snprintf(chapter_time, sizeof(chapter_time), "CHAPTER%03d=%02d:%02d:%02d.%03d", i, h, m, s, ms);
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avio_wl32(pb, len);
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avio_write(pb, chapter_time, len);
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tag = NULL;
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while ((tag = av_dict_iterate(chapters[i]->metadata, tag))) {
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int64_t len1 = !strcmp(tag->key, "title") ? 4 : strlen(tag->key);
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int64_t len2 = strlen(tag->value);
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if (len1+1+len2+10 > UINT32_MAX)
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return AVERROR(EINVAL);
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avio_wl32(pb, 10 + len1 + 1 + len2);
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avio_write(pb, chapter_time, 10);
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if (!strcmp(tag->key, "title"))
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avio_write(pb, "NAME", 4);
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else
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avio_write(pb, tag->key, len1);
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avio_w8(pb, '=');
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avio_write(pb, tag->value, len2);
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}
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}
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} else
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avio_wl32(pb, 0);
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return 0;
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}
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