5b82ffc291
After we've been hit by Large File Support problems several times in the past week (which only occur on 32 bit platforms, which I don't have), this is yet another attempt to fix the issue.
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "chunk.h"
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#include "audio_format.h"
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#include "tag.h"
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#include <assert.h>
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void
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music_chunk_init(struct music_chunk *chunk)
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{
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chunk->length = 0;
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chunk->tag = NULL;
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}
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void
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music_chunk_free(struct music_chunk *chunk)
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{
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if (chunk->tag != NULL)
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tag_free(chunk->tag);
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}
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#ifndef NDEBUG
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bool
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music_chunk_check_format(const struct music_chunk *chunk,
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const struct audio_format *audio_format)
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{
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assert(chunk != NULL);
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assert(audio_format != NULL);
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assert(audio_format_valid(audio_format));
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return chunk->length == 0 ||
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audio_format_equals(&chunk->audio_format, audio_format);
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}
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#endif
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void *
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music_chunk_write(struct music_chunk *chunk,
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const struct audio_format *audio_format,
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float data_time, uint16_t bit_rate,
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size_t *max_length_r)
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{
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const size_t frame_size = audio_format_frame_size(audio_format);
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size_t num_frames;
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assert(music_chunk_check_format(chunk, audio_format));
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assert(chunk->length == 0 || audio_format_valid(&chunk->audio_format));
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if (chunk->length == 0) {
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/* if the chunk is empty, nobody has set bitRate and
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times yet */
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chunk->bit_rate = bit_rate;
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chunk->times = data_time;
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}
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num_frames = (sizeof(chunk->data) - chunk->length) / frame_size;
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if (num_frames == 0)
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return NULL;
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#ifndef NDEBUG
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chunk->audio_format = *audio_format;
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#endif
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*max_length_r = num_frames * frame_size;
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return chunk->data + chunk->length;
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}
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bool
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music_chunk_expand(struct music_chunk *chunk,
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const struct audio_format *audio_format, size_t length)
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{
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const size_t frame_size = audio_format_frame_size(audio_format);
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assert(chunk != NULL);
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assert(chunk->length + length <= sizeof(chunk->data));
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assert(audio_format_equals(&chunk->audio_format, audio_format));
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chunk->length += length;
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return chunk->length + frame_size > sizeof(chunk->data);
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}
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