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FFmpeg/libavformat/vorbiscomment.h
Andreas Rheinhardt 6397b4d6a2 avformat/vorbiscomment: Switch to AVIOContext from bytestream API
Up until now ff_vorbiscomment_write() used the bytestream API to write
VorbisComments. Therefore the caller had to provide a sufficiently large
buffer to write the output.

Yet two of the three callers (namely the FLAC and the Matroska muxer)
actually want the output to be written via an AVIOContext; therefore
they allocated buffers of the right size just for this purpose (i.e.
they get freed immediately afterwards). Only the Ogg muxer actually
wants a buffer. But given that it is easy to wrap a buffer into an
AVIOContext this commit changes ff_vorbiscomment_write() to use an
AVIOContext for its output.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-05-03 13:43:54 +02:00

58 lines
2.1 KiB
C

/*
* 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
*/
#ifndef AVFORMAT_VORBISCOMMENT_H
#define AVFORMAT_VORBISCOMMENT_H
#include "avformat.h"
#include "metadata.h"
/**
* Calculate the length in bytes of a VorbisComment. This is the minimum
* size required by ff_vorbiscomment_write().
*
* @param m The metadata structure to be parsed. For no metadata, set to NULL.
* @param vendor_string The vendor string to be added into the VorbisComment.
* For no string, set to an empty string.
* @return The length in bytes.
*/
int64_t ff_vorbiscomment_length(const AVDictionary *m, const char *vendor_string,
AVChapter **chapters, unsigned int nb_chapters);
/**
* Write a VorbisComment into an AVIOContext. The output size can be obtained
* in advance by passing the same chapters, AVDictionary and vendor_string to
* ff_vorbiscomment_length()
*
* @param pb The AVIOContext to write the output.
* @param m The metadata struct to write.
* @param vendor_string The vendor string to write.
* @param chapters The chapters to write.
* @param nb_chapters The number of chapters to write.
*/
int ff_vorbiscomment_write(AVIOContext *pb, const AVDictionary *m,
const char *vendor_string,
AVChapter **chapters, unsigned int nb_chapters);
extern const AVMetadataConv ff_vorbiscomment_metadata_conv[];
#endif /* AVFORMAT_VORBISCOMMENT_H */