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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>
#define _SYSTEM_WITH_JNI /* for getJavaEnvironment */
#include <pthread.h>
#include "system.h"
#include "kernel.h"
#include "debug.h"
#include "pcm.h"
#include "pcm-internal.h"
extern JNIEnv *env_ptr;
/* infos about our pcm chunks */
static const void *pcm_data_start;
static size_t pcm_data_size;
static int audio_locked = 0;
static pthread_mutex_t audio_lock_mutex = PTHREAD_MUTEX_INITIALIZER;
/* cache frequently called methods */
static jmethodID play_pause_method;
static jmethodID stop_method;
static jmethodID set_volume_method;
static jmethodID write_method;
static jclass RockboxPCM_class;
static jobject RockboxPCM_instance;
/*
* mutex lock/unlock wrappers neatness' sake
*/
static inline void lock_audio(void)
{
pthread_mutex_lock(&audio_lock_mutex);
}
static inline void unlock_audio(void)
{
pthread_mutex_unlock(&audio_lock_mutex);
}
/*
* write pcm samples to the hardware. Calls AudioTrack.write directly (which
* is usually a blocking call)
*
* temp_array is not strictly needed as a parameter as we could
* create it here, but that would result in frequent garbage collection
*
* it is called from the PositionMarker callback of AudioTrack
**/
JNIEXPORT jint JNICALL
Java_org_rockbox_RockboxPCM_nativeWrite(JNIEnv *env, jobject this,
jbyteArray temp_array, jint max_size)
{
bool new_buffer = false;
lock_audio();
jint left = max_size;
if (!pcm_data_size) /* get some initial data */
{
new_buffer = pcm_play_dma_complete_callback(PCM_DMAST_OK,
&pcm_data_start, &pcm_data_size);
}
while(left > 0 && pcm_data_size)
{
jint ret;
jsize transfer_size = MIN((size_t)left, pcm_data_size);
/* decrement both by the amount we're going to write */
pcm_data_size -= transfer_size; left -= transfer_size;
(*env)->SetByteArrayRegion(env, temp_array, 0,
transfer_size, (jbyte*)pcm_data_start);
if (new_buffer)
{
new_buffer = false;
pcm_play_dma_status_callback(PCM_DMAST_STARTED);
}
/* SetByteArrayRegion copies, which enables us to unlock audio. This
* is good because the below write() call almost certainly block.
* This allows the mixer to be clocked at a regular interval which vastly
* improves responsiveness when pausing/stopping playback */
unlock_audio();
ret = (*env)->CallIntMethod(env, this, write_method,
temp_array, 0, transfer_size);
lock_audio();
/* check if still playing. might have changed during the write() call */
if (!pcm_is_playing())
break;
if (ret < 0)
{
unlock_audio();
return ret;
}
if (pcm_data_size == 0) /* need new data */
{
new_buffer = pcm_play_dma_complete_callback(PCM_DMAST_OK,
&pcm_data_start, &pcm_data_size);
}
else /* increment data pointer and feed more */
pcm_data_start += transfer_size;
}
if (new_buffer)
pcm_play_dma_status_callback(PCM_DMAST_STARTED);
unlock_audio();
return max_size - left;
}
void pcm_play_lock(void)
{
if (++audio_locked == 1)
lock_audio();
}
void pcm_play_unlock(void)
{
if (--audio_locked == 0)
unlock_audio();
}
void pcm_dma_apply_settings(void)
{
}
void pcm_play_dma_start(const void *addr, size_t size)
{
pcm_data_start = addr;
pcm_data_size = size;
(*env_ptr)->CallVoidMethod(env_ptr,
RockboxPCM_instance,
play_pause_method,
0);
}
void pcm_play_dma_stop(void)
{
/* NOTE: due to how pcm_play_dma_complete_callback() works, this is
* possibly called from nativeWrite(), i.e. another (host) thread
* => need to discover the appropriate JNIEnv* */
JNIEnv* env = getJavaEnvironment();
(*env)->CallVoidMethod(env,
RockboxPCM_instance,
stop_method);
}
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");
write_method = e->GetMethodID(env_ptr, RockboxPCM_class, "write", "([BII)I");
}
void pcm_play_dma_postinit(void)
{
}
void pcm_set_mixer_volume(int volume)
{
(*env_ptr)->CallVoidMethod(env_ptr, RockboxPCM_instance, set_volume_method, volume);
}
/*
* release audio resources */
void pcm_shutdown(void)
{
JNIEnv e = *env_ptr;
jmethodID release = e->GetMethodID(env_ptr, RockboxPCM_class, "release", "()V");
e->CallVoidMethod(env_ptr, RockboxPCM_instance, release);
pthread_mutex_destroy(&audio_lock_mutex);
}
JNIEXPORT void JNICALL
Java_org_rockbox_RockboxPCM_postVolumeChangedEvent(JNIEnv *env,
jobject this,
jint volume)
{
(void) env;
(void) this;
/* for the main queue, the volume will be available through
* button_get_data() */
queue_broadcast(SYS_VOLUME_CHANGED, volume);
}
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