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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (c) 2010 Thomas Martitz
*
* 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 <jni.h>
#include <stdbool.h>
#include <system.h>
#include "pcm.h"
extern JNIEnv *env_ptr;
/* infos about our pcm chunks */
static size_t pcm_data_size;
static char *pcm_data_start;
/* cache frequently called methods */
static jmethodID play_pause_method;
static jmethodID stop_method;
static jmethodID set_volume_method;
static jclass RockboxPCM_class;
static jobject RockboxPCM_instance;
/*
* transfer our raw data into a java array
*
* a bit of a monster functions, but it should cover all cases to overcome
* the issue that the chunk size of the java layer and our pcm chunks are
* differently sized
*
* afterall, it only copies the raw pcm data from pcm_data_start to
* the passed byte[]-array
*
* it is called from the PositionMarker callback of AudioTrack
**/
JNIEXPORT void JNICALL
Java_org_rockbox_RockboxPCM_pcmSamplesToByteArray(JNIEnv *env,
jobject this,
jbyteArray arr)
{
(void)this;
size_t len;
size_t array_size = (*env)->GetArrayLength(env, arr);
if (array_size > pcm_data_size)
len = pcm_data_size;
else
len = array_size;
(*env)->SetByteArrayRegion(env, arr, 0, len, pcm_data_start);
if (array_size > pcm_data_size)
{ /* didn't have enough data for the array ? */
size_t remaining = array_size - pcm_data_size;
size_t offset = len;
retry:
pcm_play_get_more_callback((void**)&pcm_data_start, &pcm_data_size);
if (pcm_data_size == 0)
return;
if (remaining > pcm_data_size)
{ /* got too little data, get more ... */
(*env)->SetByteArrayRegion(env, arr, offset, pcm_data_size, pcm_data_start);
/* advance in the java array by the amount we copied */
offset += pcm_data_size;
/* we copied at least a bit */
remaining -= pcm_data_size;
/* let's get another buch of data and try again */
goto retry;
}
else
(*env)->SetByteArrayRegion(env, arr, offset, remaining, pcm_data_start);
len = remaining;
}
pcm_data_start += len;
pcm_data_size -= len;
}
void pcm_play_lock(void)
{
}
void pcm_play_unlock(void)
{
}
void pcm_dma_apply_settings(void)
{
}
void pcm_play_dma_start(const void *addr, size_t size)
{
pcm_data_start = (char*)addr;
pcm_data_size = size;
pcm_play_dma_pause(false);
}
void pcm_play_dma_stop(void)
{
(*env_ptr)->CallVoidMethod(env_ptr,
RockboxPCM_instance,
stop_method);
}
void pcm_play_dma_pause(bool pause)
{
(*env_ptr)->CallVoidMethod(env_ptr,
RockboxPCM_instance,
play_pause_method,
(int)pause);
}
size_t pcm_get_bytes_waiting(void)
{
return pcm_data_size;
}
const void * pcm_play_dma_get_peak_buffer(int *count)
{
uintptr_t addr = (uintptr_t)pcm_data_start;
*count = pcm_data_size / 4;
return (void *)((addr + 3) & ~3);
}
void pcm_play_dma_init(void)
{
/* in order to have background music playing after leaving the activity,
* we need to allocate the PCM object from the Rockbox thread (the Activity
* runs in a separate thread because it would otherwise kill us when
* stopping it)
*
* Luckily we only reference the PCM object from here, so it's safe (and
* clean) to allocate it here
**/
JNIEnv e = *env_ptr;
/* get the class and its constructor */
RockboxPCM_class = e->FindClass(env_ptr, "org/rockbox/RockboxPCM");
jmethodID constructor = e->GetMethodID(env_ptr, RockboxPCM_class, "<init>", "()V");
/* instance = new RockboxPCM() */
RockboxPCM_instance = e->NewObject(env_ptr, RockboxPCM_class, constructor);
/* cache needed methods */
play_pause_method = e->GetMethodID(env_ptr, RockboxPCM_class, "play_pause", "(Z)V");
set_volume_method = e->GetMethodID(env_ptr, RockboxPCM_class, "set_volume", "(I)V");
stop_method = e->GetMethodID(env_ptr, RockboxPCM_class, "stop", "()V");
/* get initial pcm data, if any */
pcm_play_get_more_callback((void*)&pcm_data_start, &pcm_data_size);
}
void pcm_postinit(void)
{
}
void pcm_set_mixer_volume(int volume)
{
(*env_ptr)->CallVoidMethod(env_ptr, RockboxPCM_instance, set_volume_method, volume);
}
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