PeerStreamer

/*

 * VorbisComment writer

 * Copyright (c) 2009 James Darnley

 *

 * 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

 */

#include "avformat.h"

#include "metadata.h"

#include "vorbiscomment.h"

#include "libavcodec/bytestream.h"

/**

 * VorbisComment metadata conversion mapping.

 * from Ogg Vorbis I format specification: comment field and header specification

 * http://xiph.org/vorbis/doc/v-comment.html

 */

const AVMetadataConv ff_vorbiscomment_metadata_conv[] = {

    { "ALBUMARTIST", "album_artist"},

    { "TRACKNUMBER", "track"  },

    { "DISCNUMBER",  "disc"   },

    { 0 }

};

int ff_vorbiscomment_length(AVMetadata *m, const char *vendor_string,

                            unsigned *count)

{

    int len = 8;

    len += strlen(vendor_string);

    *count = 0;

    if (m) {

        AVMetadataTag *tag = NULL;

        while ((tag = av_metadata_get(m, "", tag, AV_METADATA_IGNORE_SUFFIX))) {

            len += 4 +strlen(tag->key) + 1 + strlen(tag->value);

            (*count)++;

        }

    }

    return len;

}

int ff_vorbiscomment_write(uint8_t **p, AVMetadata **m,

                           const char *vendor_string, const unsigned count)

{

    metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);

    bytestream_put_le32(p, strlen(vendor_string));

    bytestream_put_buffer(p, vendor_string, strlen(vendor_string));

    if (*m) {

        AVMetadataTag *tag = NULL;

        bytestream_put_le32(p, count);

        while ((tag = av_metadata_get(*m, "", tag, AV_METADATA_IGNORE_SUFFIX))) {

            unsigned int len1 = strlen(tag->key);

            unsigned int len2 = strlen(tag->value);

            bytestream_put_le32(p, len1+1+len2);

            bytestream_put_buffer(p, tag->key, len1);

            bytestream_put_byte(p, '=');

            bytestream_put_buffer(p, tag->value, len2);

        }

    } else

        bytestream_put_le32(p, 0);

    return 0;

}