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.
99 lines
2.6 KiB
C
99 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 "crossfade.h"
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#include "pcm_mix.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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#include <string.h>
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unsigned cross_fade_calc(float duration, float total_time,
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const struct audio_format *af,
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const struct audio_format *old_format,
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unsigned max_chunks)
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{
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unsigned int chunks;
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if (duration <= 0 || duration >= total_time ||
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/* we can't crossfade when the audio formats are different */
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!audio_format_equals(af, old_format))
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return 0;
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assert(duration > 0);
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assert(af->bits > 0);
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assert(af->channels > 0);
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assert(af->sample_rate > 0);
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chunks = audio_format_time_to_size(af) / CHUNK_SIZE;
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chunks = (chunks * duration + 0.5);
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if (chunks > max_chunks)
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chunks = max_chunks;
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return chunks;
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}
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void cross_fade_apply(struct music_chunk *a, const struct music_chunk *b,
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const struct audio_format *format,
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unsigned int current_chunk, unsigned int num_chunks)
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{
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size_t size;
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assert(a != NULL);
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assert(b != NULL);
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assert(a->length == 0 || b->length == 0 ||
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audio_format_equals(&a->audio_format, &b->audio_format));
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assert(current_chunk <= num_chunks);
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if (a->tag == NULL && b->tag != NULL)
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/* merge the tag into the destination chunk */
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a->tag = tag_dup(b->tag);
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size = b->length > a->length
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? a->length
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: b->length;
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pcm_mix(a->data,
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b->data,
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size,
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format,
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((float)current_chunk) / num_chunks);
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if (b->length > a->length) {
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/* the second buffer is larger than the first one:
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there is unmixed rest at the end. Copy it over.
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The output buffer API guarantees that there is
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enough room in a->data. */
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#ifndef NDEBUG
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if (a->length == 0)
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a->audio_format = b->audio_format;
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#endif
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memcpy(a->data + a->length,
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b->data + a->length,
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b->length - a->length);
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a->length = b->length;
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}
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}
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