static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m, int last_block, int bitexact) { const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT; unsigned int len; uint8_t *p, *p0; ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL); len = ff_vorbiscomment_length(*m, vendor); p0 = av_malloc(len+4); if (!p0) return AVERROR(ENOMEM); p = p0; bytestream_put_byte(&p, last_block ? 0x84 : 0x04); bytestream_put_be24(&p, len); ff_vorbiscomment_write(&p, m, vendor); avio_write(pb, p0, len+4); av_freep(&p0); p = NULL; return 0; }