1 files changed, 174 insertions, 0 deletions

diff --git a/firmware/target/hosted/android/pcm-android.c b/firmware/target/hosted/android/pcm-android.c
new file mode 100644
index 0000000000..91978f422b
--- /dev/null
+++ b/firmware/target/hosted/android/pcm-android.c
@@ -0,0 +1,174 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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;
+extern jclass  RockboxActivity_class;
+extern jobject RockboxActivity_instance;
+
+/* 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);
+}