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https://github.com/Rockbox/rockbox.git
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695698b918
cRSID natively renders its output as a 16bit mono stream. There's no reason to not use it as-is, and save a bunch of CPU cycles in the process. Change-Id: Ib934c05e77298e377053b29db91d1f05fb65eb76
114 lines
3.4 KiB
C
114 lines
3.4 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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*
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* SID Codec for Rockbox using Hermit's cRSID library
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*
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* Written by Hermit (Mihaly Horvath) and Ninja (Wolfram Sang) in 2022/23.
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* Some generic codec handling taken from the former SID codec done by
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* Tammo Hinrichs, Rainer Sinsch, Dave Chapman, Stefan Waigand, Igor Poretsky,
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* Solomon Peachy.
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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 "cRSID/libcRSID.h"
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#include "codeclib.h"
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#include <inttypes.h>
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CODEC_HEADER
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/* bigger CHUNK_SIZE makes Clip sluggish when playing 2SIDs */
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#define CHUNK_SIZE 512
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#define SID_BUFFER_SIZE 0x10000
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#define SAMPLE_RATE 44100
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static int16_t samples[CHUNK_SIZE] IBSS_ATTR;
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static void sid_render(int16_t *buffer, unsigned long len) ICODE_ATTR;
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static void sid_render(int16_t *buffer, unsigned long len) {
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unsigned long bp;
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for (bp = 0; bp < len; bp++) {
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buffer[bp] = cRSID_generateSample(&cRSID_C64);
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}
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}
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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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ci->configure(DSP_SET_FREQUENCY, SAMPLE_RATE);
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ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
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ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
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cRSID_init(SAMPLE_RATE, CHUNK_SIZE);
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}
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return CODEC_OK;
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}
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enum codec_status codec_run(void)
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{
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cRSID_SIDheader *SIDheader;
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size_t filesize;
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unsigned char subSong;
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unsigned char *sidfile = NULL;
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intptr_t param;
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bool resume;
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long action;
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if (codec_init())
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return CODEC_ERROR;
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codec_set_replaygain(ci->id3);
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ci->seek_buffer(0);
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sidfile = ci->request_buffer(&filesize, SID_BUFFER_SIZE);
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if (filesize == 0)
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return CODEC_ERROR;
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param = ci->id3->elapsed;
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resume = param != 0;
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/* Start first song */
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action = CODEC_ACTION_SEEK_TIME;
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while (action != CODEC_ACTION_HALT) {
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if (action == CODEC_ACTION_SEEK_TIME) {
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/* Start playing from scratch */
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SIDheader = cRSID_processSIDfile(&cRSID_C64, sidfile, filesize);
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subSong = SIDheader->DefaultSubtune - 1;
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/* Now use the current seek time in seconds as subsong */
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if (!resume || (resume && param))
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subSong = param / 1000;
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/* Set the elapsed time to the current subsong (in seconds) */
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ci->set_elapsed(subSong * 1000);
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ci->seek_complete();
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resume = false;
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cRSID_initSIDtune(&cRSID_C64, SIDheader, subSong + 1);
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}
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sid_render(samples, CHUNK_SIZE);
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ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE);
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/* New time is in param */
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action = ci->get_command(¶m);
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}
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return CODEC_OK;
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}
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