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codecs: Add support for the 'VTX' ZX Spectrum chiptunes format.

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This codec requires floating point.

Original author:  Peter Sovietov
Ported to Rockbox:  Roman Skylarov
Further integration and bugfixes:  Solomon Peachy

Change-Id: I781ecd3592dfcdbbc694063334350342534f1d6c
This commit is contained in:
Solomon Peachy 2020-09-26 17:19:07 -04:00
parent 278522f811
commit 4231c2c83f
29 changed files with 1642 additions and 41 deletions
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138
lib/rbcodec/codecs/vtx.c Normal file
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* VTX Codec for rockbox based on the Ayumi engine
*
* Ayumi engine Written by Peter Sovietov in 2015
* Ported to rockbox '2019 by Roman Stolyarov
*
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <codecs/lib/codeclib.h>
#include "libayumi/ayumi_render.h"
CODEC_HEADER
#define VTX_SAMPLE_RATE 44100
/* Maximum number of bytes to process in one iteration */
#define CHUNK_SIZE (1024*2)
static int16_t samples[CHUNK_SIZE] IBSS_ATTR;
extern ayumi_render_t ay;
/****************** rockbox interface ******************/
/* this is the codec entry point */
enum codec_status codec_main(enum codec_entry_call_reason reason)
{
if (reason == CODEC_LOAD) {
/* we only render 16 bits */
ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
/* 44 Khz, Interleaved stereo */
ci->configure(DSP_SET_FREQUENCY, VTX_SAMPLE_RATE);
ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
}
return CODEC_OK;
}
/* this is called for each file to process */
enum codec_status codec_run(void)
{
uint8_t *buf;
size_t n;
intptr_t param;
uint32_t elapsed_time;
long smp;
int res;
/* reset values */
elapsed_time = 0;
param = ci->id3->elapsed;
DEBUGF("VTX: next_track\n");
if (codec_init()) {
return CODEC_ERROR;
}
codec_set_replaygain(ci->id3);
/* Read the entire file */
DEBUGF("VTX: request file\n");
ci->seek_buffer(0);
buf = ci->request_buffer(&n, ci->filesize);
if (!buf || n < (size_t)ci->filesize) {
DEBUGF("VTX: file load failed\n");
return CODEC_ERROR;
}
res = AyumiRender_LoadFile((void *)buf, ci->filesize);
if (!res) {
DEBUGF("VTX: AyumiRender_LoadFile failed\n");
return CODEC_ERROR;
}
res = AyumiRender_AyInit(ay.info.chiptype, VTX_SAMPLE_RATE, ay.info.chipfreq, ay.info.playerfreq, 1);
if (!res) {
DEBUGF("VTX: AyumiRender_AyInit failed\n");
return CODEC_ERROR;
}
res = AyumiRender_SetLayout(ay.info.layout, 0);
if (!res) {
DEBUGF("VTX: AyumiRender_SetLayout failed\n");
return CODEC_ERROR;
}
if (param) {
goto resume_start;
}
/* The main decoder loop */
while (1) {
long action = ci->get_command(&param);
if (action == CODEC_ACTION_HALT)
break;
if (action == CODEC_ACTION_SEEK_TIME) {
resume_start:
ci->set_elapsed(param);
elapsed_time = param;
ulong sample = ((ulong)elapsed_time * 441) / 10;
AyumiRender_Seek(sample);
ci->seek_complete();
}
/* Generate audio buffer */
smp = AyumiRender_AySynth((void *)&samples[0], CHUNK_SIZE >> 1);
ci->pcmbuf_insert(samples, NULL, smp);
/* Set elapsed time for one track files */
elapsed_time += smp * 10 / 441;
ci->set_elapsed(elapsed_time);
if (AyumiRender_GetPos() >= AyumiRender_GetMaxPos())
break;
}
return CODEC_OK;
}