7ad2cad173
buffer chunks. * Samples and position indication is closely associated with audio data instead of compensating by a latency constant. Alleviates problems with using the elapsed as a track indicator where it could be off by several steps. * Timing is accurate throughout track even if resampling for pitch shift, whereas before it updated during transition latency at the normal 1:1 rate. * Simpler PCM buffer with a constant chunk size, no linked lists. In converting crossfade, a minor change was made to not change the WPS until the fade-in of the incoming track, whereas before it would change upon the start of the fade-out of the outgoing track possibly having the WPS change with far too much lead time. Codec changes are to set elapsed times *before* writing next PCM frame because time and position data last set are saved in the next committed PCM chunk. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30366 a1c6a512-1295-4272-9138-f99709370657
127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 David Bryant
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "codeclib.h"
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#include "libwavpack/wavpack.h"
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CODEC_HEADER
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#define BUFFER_SIZE 4096
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static int32_t temp_buffer [BUFFER_SIZE] IBSS_ATTR;
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static int32_t read_callback (void *buffer, int32_t bytes)
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{
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int32_t retval = ci->read_filebuf (buffer, bytes);
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ci->set_offset(ci->curpos);
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return retval;
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}
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/* this is the codec entry point */
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enum codec_status codec_main(enum codec_entry_call_reason reason)
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{
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if (reason == CODEC_LOAD) {
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/* Generic codec initialisation */
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ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
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}
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return CODEC_OK;
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}
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/* this is called for each file to process */
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enum codec_status codec_run(void)
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{
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WavpackContext *wpc;
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char error [80];
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/* rockbox: comment 'set but unused' variables
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int bps;
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*/
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int nchans, sr_100;
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intptr_t param;
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if (codec_init())
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return CODEC_ERROR;
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ci->seek_buffer (ci->id3->offset);
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/* Create a decoder instance */
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wpc = WavpackOpenFileInput (read_callback, error);
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if (!wpc)
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return CODEC_ERROR;
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ci->configure(DSP_SWITCH_FREQUENCY, WavpackGetSampleRate (wpc));
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codec_set_replaygain(ci->id3);
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/* bps = WavpackGetBytesPerSample (wpc); */
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nchans = WavpackGetReducedChannels (wpc);
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ci->configure(DSP_SET_STEREO_MODE, nchans == 2 ? STEREO_INTERLEAVED : STEREO_MONO);
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sr_100 = ci->id3->frequency / 100;
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ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
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/* The main decoder loop */
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while (1) {
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int32_t nsamples;
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enum codec_command_action action = ci->get_command(¶m);
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if (action == CODEC_ACTION_HALT)
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break;
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if (action == CODEC_ACTION_SEEK_TIME) {
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int curpos_ms = WavpackGetSampleIndex (wpc) / sr_100 * 10;
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int n, d, skip;
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if (param > curpos_ms) {
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n = param - curpos_ms;
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d = ci->id3->length - curpos_ms;
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skip = (int)((int64_t)(ci->filesize - ci->curpos) * n / d);
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ci->seek_buffer (ci->curpos + skip);
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}
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else if (curpos_ms != 0) {
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n = curpos_ms - param;
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d = curpos_ms;
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skip = (int)((int64_t) ci->curpos * n / d);
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ci->seek_buffer (ci->curpos - skip);
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}
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wpc = WavpackOpenFileInput (read_callback, error);
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if (!wpc)
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{
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ci->seek_complete();
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break;
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}
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ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
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ci->seek_complete();
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}
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nsamples = WavpackUnpackSamples (wpc, temp_buffer, BUFFER_SIZE / nchans);
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if (!nsamples)
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break;
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ci->pcmbuf_insert (temp_buffer, NULL, nsamples);
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ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
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}
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return CODEC_OK;
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}
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