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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2009, 2010 Wincent Balin
*
* 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 "plugin.h"
#include "../../pdbox.h"
#include "m_pd.h"
#include "s_stuff.h"
/* Declare functions that go to IRAM. */
void pdbox_get_more(const void** start, size_t* size) ICODE_ATTR;
int rockbox_send_dacs(void) ICODE_ATTR;
/* Extern variables. */
extern float sys_dacsr;
extern t_sample *sys_soundout;
extern t_sample *sys_soundin;
/* Output buffer. */
#define OUTBUFSIZE 3
static struct audio_buffer outbuf[OUTBUFSIZE];
static unsigned int outbuf_head;
static unsigned int outbuf_tail;
static unsigned int outbuf_fill;
/* Playing status. */
static bool playing;
/* Open audio. */
void rockbox_open_audio(int rate)
{
unsigned int i;
/* No sound yet. */
playing = false;
/* Stop playing to reconfigure audio settings. */
rb->pcm_play_stop();
#if INPUT_SRC_CAPS != 0
/* Select playback */
rb->audio_set_input_source(AUDIO_SRC_PLAYBACK, SRCF_PLAYBACK);
rb->audio_set_output_source(AUDIO_SRC_PLAYBACK);
#endif
/* Set sample rate of the audio buffer. */
rb->pcm_set_frequency(rate);
rb->pcm_apply_settings();
/* Initialize output buffer. */
for(i = 0; i < OUTBUFSIZE; i++)
outbuf[i].fill = 0;
outbuf_head = 0;
outbuf_tail = 0;
outbuf_fill = 0;
}
/* Close audio. */
void rockbox_close_audio(void)
{
/* Stop playback. */
rb->pcm_play_stop();
/* Reset playing status. */
playing = false;
/* Restore default sampling rate. */
rb->pcm_set_frequency(HW_SAMPR_DEFAULT);
rb->pcm_apply_settings();
}
/* Rockbox audio callback. */
void pdbox_get_more(const void** start, size_t* size)
{
if(outbuf_fill > 0)
{
/* Store output data address and size. */
*start = outbuf[outbuf_tail].data;
*size = sizeof(outbuf[outbuf_tail].data);
/* Free this part of output buffer. */
outbuf[outbuf_tail].fill = 0;
/* Advance to the next part of output buffer. */
if(outbuf_tail == OUTBUFSIZE-1)
outbuf_tail = 0;
else
outbuf_tail++;
/* Decrease output buffer fill. */
outbuf_fill--;
}
else
{
/* Reset playing status. */
playing = false;
/* Nothing to play. */
}
}
/* Audio I/O. */
int rockbox_send_dacs(void)
{
/* Copy sys_output buffer. */
t_sample* left = sys_soundout + DEFDACBLKSIZE*0;
t_sample* right = sys_soundout + DEFDACBLKSIZE*1;
unsigned int samples_out = 0;
int16_t* out;
register int sample;
/* Cancel if whole buffer filled. */
if(outbuf_fill >= OUTBUFSIZE-1)
return SENDDACS_NO;
do
{
/* Write the block of sound. */
for(out = outbuf[outbuf_head].data +
outbuf[outbuf_head].fill * PD_OUT_CHANNELS;
outbuf[outbuf_head].fill < (AUDIOBUFSIZE / PD_OUT_CHANNELS) &&
samples_out < DEFDACBLKSIZE;
left++, right++, samples_out++, outbuf[outbuf_head].fill++)
{
/* Copy samples from both channels. */
sample = SCALE16(*left);
if(sample > 32767)
sample = 32767;
else if(sample < -32767)
sample = -32767;
*out++ = sample;
sample = SCALE16(*right);
if(sample > 32767)
sample = 32767;
else if(sample < -32767)
sample = -32767;
*out++ = sample;
}
/* If part of output buffer filled... */
if(outbuf[outbuf_head].fill >= (AUDIOBUFSIZE / PD_OUT_CHANNELS))
{
/* Advance one part of output buffer. */
if(outbuf_head == OUTBUFSIZE-1)
outbuf_head = 0;
else
outbuf_head++;
/* Increase fill counter. */
outbuf_fill++;
}
/* If needed, fill the next frame. */
}
while(samples_out < DEFDACBLKSIZE);
/* Clear Pure Data output buffer. */
memset(sys_soundout,
0,
sizeof(t_sample) * DEFDACBLKSIZE * PD_OUT_CHANNELS);
/* If still not playing... */
if(!playing && outbuf_fill > 0)
{
/* Start playing. */
rb->pcm_play_data(pdbox_get_more, NULL, NULL, 0);
/* Set status flag. */
playing = true;
}
return SENDDACS_YES;
}
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