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ffmpeg / libavformat / vorbiscomment.c @ 66061a12

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/*
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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 "avformat.h"
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#include "metadata.h"
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#include "vorbiscomment.h"
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#include "libavcodec/bytestream.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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    { 0 }
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};
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int ff_vorbiscomment_length(AVMetadata *m, const char *vendor_string,
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                            unsigned *count)
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{
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    int len = 8;
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    len += strlen(vendor_string);
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    *count = 0;
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    if (m) {
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        AVMetadataTag *tag = NULL;
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        while ( (tag = av_metadata_get(m, "", tag, AV_METADATA_IGNORE_SUFFIX) ) ) {
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            len += 4 +strlen(tag->key) + 1 + strlen(tag->value);
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            (*count)++;
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        }
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    }
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    return len;
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}
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int ff_vorbiscomment_write(uint8_t **p, AVMetadata *m,
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                           const char *vendor_string, const unsigned count)
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{
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    bytestream_put_le32(p, strlen(vendor_string));
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    bytestream_put_buffer(p, vendor_string, strlen(vendor_string));
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    if (m) {
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        AVMetadataTag *tag = NULL;
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        bytestream_put_le32(p, count);
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        while ( (tag = av_metadata_get(m, "", tag, AV_METADATA_IGNORE_SUFFIX) ) ) {
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            unsigned int len1 = strlen(tag->key);
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            unsigned int len2 = strlen(tag->value);
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            bytestream_put_le32(p, len1+1+len2);
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            bytestream_put_buffer(p, tag->key, len1);
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            bytestream_put_byte(p, '=');
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            bytestream_put_buffer(p, tag->value, len2);
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        }
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    } else
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        bytestream_put_le32(p, 0);
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    return 0;
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}