/* * Copyright (C) 2003-2009 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "chunk.h" #include "audio_format.h" #include "tag.h" #include <assert.h> void music_chunk_init(struct music_chunk *chunk) { chunk->length = 0; chunk->tag = NULL; } void music_chunk_free(struct music_chunk *chunk) { if (chunk->tag != NULL) tag_free(chunk->tag); } #ifndef NDEBUG bool music_chunk_check_format(const struct music_chunk *chunk, const struct audio_format *audio_format) { assert(chunk != NULL); assert(audio_format != NULL); assert(audio_format_valid(audio_format)); return chunk->length == 0 || audio_format_equals(&chunk->audio_format, audio_format); } #endif void * music_chunk_write(struct music_chunk *chunk, const struct audio_format *audio_format, float data_time, uint16_t bit_rate, size_t *max_length_r) { const size_t frame_size = audio_format_frame_size(audio_format); size_t num_frames; assert(music_chunk_check_format(chunk, audio_format)); assert(chunk->length == 0 || audio_format_valid(&chunk->audio_format)); if (chunk->length == 0) { /* if the chunk is empty, nobody has set bitRate and times yet */ chunk->bit_rate = bit_rate; chunk->times = data_time; } num_frames = (sizeof(chunk->data) - chunk->length) / frame_size; if (num_frames == 0) return NULL; #ifndef NDEBUG chunk->audio_format = *audio_format; #endif *max_length_r = num_frames * frame_size; return chunk->data + chunk->length; } bool music_chunk_expand(struct music_chunk *chunk, const struct audio_format *audio_format, size_t length) { const size_t frame_size = audio_format_frame_size(audio_format); assert(chunk != NULL); assert(chunk->length + length <= sizeof(chunk->data)); assert(audio_format_equals(&chunk->audio_format, audio_format)); chunk->length += length; return chunk->length + frame_size > sizeof(chunk->data); }