4db3e89652
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30403 a1c6a512-1295-4272-9138-f99709370657
238 lines
7 KiB
C
238 lines
7 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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* $Id$
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*
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* Copyright (c) 2010 Thomas Martitz
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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 <jni.h>
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#include <stdbool.h>
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#define _SYSTEM_WITH_JNI /* for getJavaEnvironment */
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#include <system.h>
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#include <pthread.h>
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#include "debug.h"
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#include "pcm.h"
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#include "pcm-internal.h"
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extern JNIEnv *env_ptr;
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/* infos about our pcm chunks */
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static size_t pcm_data_size;
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static char *pcm_data_start;
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static int audio_locked = 0;
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static pthread_mutex_t audio_lock_mutex = PTHREAD_MUTEX_INITIALIZER;
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/* cache frequently called methods */
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static jmethodID play_pause_method;
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static jmethodID stop_method;
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static jmethodID set_volume_method;
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static jmethodID write_method;
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static jclass RockboxPCM_class;
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static jobject RockboxPCM_instance;
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/*
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* mutex lock/unlock wrappers neatness' sake
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*/
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static inline void lock_audio(void)
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{
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pthread_mutex_lock(&audio_lock_mutex);
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}
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static inline void unlock_audio(void)
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{
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pthread_mutex_unlock(&audio_lock_mutex);
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}
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/*
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* write pcm samples to the hardware. Calls AudioTrack.write directly (which
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* is usually a blocking call)
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*
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* temp_array is not strictly needed as a parameter as we could
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* create it here, but that would result in frequent garbage collection
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*
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* it is called from the PositionMarker callback of AudioTrack
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**/
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JNIEXPORT jint JNICALL
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Java_org_rockbox_RockboxPCM_nativeWrite(JNIEnv *env, jobject this,
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jbyteArray temp_array, jint max_size)
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{
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bool new_buffer = false;
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lock_audio();
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jint left = max_size;
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if (!pcm_data_size) /* get some initial data */
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{
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new_buffer = true;
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pcm_play_get_more_callback((void**) &pcm_data_start, &pcm_data_size);
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}
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while(left > 0 && pcm_data_size)
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{
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jint ret;
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jsize transfer_size = MIN((size_t)left, pcm_data_size);
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/* decrement both by the amount we're going to write */
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pcm_data_size -= transfer_size; left -= transfer_size;
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(*env)->SetByteArrayRegion(env, temp_array, 0,
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transfer_size, (jbyte*)pcm_data_start);
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ret = (*env)->CallIntMethod(env, this, write_method,
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temp_array, 0, transfer_size);
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if (new_buffer)
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{
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new_buffer = false;
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pcm_play_dma_started_callback();
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/* NOTE: might need to release the mutex and sleep here if the
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buffer is shorter than the required buffer (like pcm-sdl.c) to
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have the mixer clocked at a regular interval */
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}
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if (ret < 0)
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{
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unlock_audio();
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return ret;
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}
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if (pcm_data_size == 0) /* need new data */
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{
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new_buffer = true;
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pcm_play_get_more_callback((void**)&pcm_data_start, &pcm_data_size);
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}
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else /* increment data pointer and feed more */
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pcm_data_start += transfer_size;
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}
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if (new_buffer && pcm_data_size)
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pcm_play_dma_started_callback();
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unlock_audio();
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return max_size - left;
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}
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void pcm_play_lock(void)
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{
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if (++audio_locked == 1)
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lock_audio();
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}
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void pcm_play_unlock(void)
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{
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if (--audio_locked == 0)
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unlock_audio();
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}
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void pcm_dma_apply_settings(void)
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{
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}
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void pcm_play_dma_start(const void *addr, size_t size)
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{
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pcm_data_start = (char*)addr;
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pcm_data_size = size;
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pcm_play_dma_pause(false);
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}
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void pcm_play_dma_stop(void)
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{
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/* NOTE: due to how pcm_play_get_more_callback() works, this is
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* possibly called from nativeWrite(), i.e. another (host) thread
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* => need to discover the appropriate JNIEnv* */
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JNIEnv* env = getJavaEnvironment();
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(*env)->CallVoidMethod(env,
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RockboxPCM_instance,
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stop_method);
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}
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void pcm_play_dma_pause(bool pause)
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{
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(*env_ptr)->CallVoidMethod(env_ptr,
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RockboxPCM_instance,
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play_pause_method,
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(int)pause);
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}
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size_t pcm_get_bytes_waiting(void)
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{
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return pcm_data_size;
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}
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const void * pcm_play_dma_get_peak_buffer(int *count)
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{
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uintptr_t addr = (uintptr_t)pcm_data_start;
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*count = pcm_data_size / 4;
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return (void *)((addr + 3) & ~3);
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}
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void pcm_play_dma_init(void)
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{
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/* in order to have background music playing after leaving the activity,
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* we need to allocate the PCM object from the Rockbox thread (the Activity
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* runs in a separate thread because it would otherwise kill us when
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* stopping it)
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*
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* Luckily we only reference the PCM object from here, so it's safe (and
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* clean) to allocate it here
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**/
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JNIEnv e = *env_ptr;
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/* get the class and its constructor */
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RockboxPCM_class = e->FindClass(env_ptr, "org/rockbox/RockboxPCM");
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jmethodID constructor = e->GetMethodID(env_ptr, RockboxPCM_class, "<init>", "()V");
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/* instance = new RockboxPCM() */
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RockboxPCM_instance = e->NewObject(env_ptr, RockboxPCM_class, constructor);
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/* cache needed methods */
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play_pause_method = e->GetMethodID(env_ptr, RockboxPCM_class, "play_pause", "(Z)V");
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set_volume_method = e->GetMethodID(env_ptr, RockboxPCM_class, "set_volume", "(I)V");
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stop_method = e->GetMethodID(env_ptr, RockboxPCM_class, "stop", "()V");
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write_method = e->GetMethodID(env_ptr, RockboxPCM_class, "write", "([BII)I");
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}
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void pcm_play_dma_postinit(void)
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{
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}
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void pcm_set_mixer_volume(int volume)
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{
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(*env_ptr)->CallVoidMethod(env_ptr, RockboxPCM_instance, set_volume_method, volume);
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}
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/*
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* release audio resources */
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void pcm_shutdown(void)
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{
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JNIEnv e = *env_ptr;
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jmethodID release = e->GetMethodID(env_ptr, RockboxPCM_class, "release", "()V");
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e->CallVoidMethod(env_ptr, RockboxPCM_instance, release);
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pthread_mutex_destroy(&audio_lock_mutex);
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}
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JNIEXPORT void JNICALL
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Java_org_rockbox_RockboxPCM_postVolumeChangedEvent(JNIEnv *env,
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jobject this,
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jint volume)
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{
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(void) env;
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(void) this;
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/* for the main queue, the volume will be available through
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* button_get_data() */
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queue_broadcast(SYS_VOLUME_CHANGED, volume);
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}
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