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Copy pathDecoderAndroidImplementation.cpp
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381 lines (336 loc) · 14.6 KB
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/*
* Copyright (c) 2018 Spotify AB.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include "DecoderAndroidImplementation.h"
#if ANDROID
#include <jni.h>
#include <stdlib.h>
#include <string.h>
namespace nativeformat {
namespace decoder {
static JavaVM *javaVM = NULL;
static jclass decoderClass = NULL;
static jfieldID samplerateFieldID;
static jfieldID channelFieldID;
static jfieldID durationFieldID;
static jmethodID errorMethodID;
static jmethodID decodeMethodID;
static jmethodID seekMethodID;
// Java can not realloc our receiving buffer at all. We suppose that 512 kb
// should be enough for one packet.
#define JAVABUFFERSIZEBYTES (512 * 1024)
static const std::string domain("com.nativeformat.decoder.android");
typedef struct decoderAndroidInternals {
std::shared_ptr<DataProvider> dataProvider;
jobject javaDecoder;
short int *intBuffer;
float *floatBuffer;
double samplerate;
long durationFrames;
int channels, bufferCapacityFrames, bufferReadPosFrames, bufferWritePosFrames, numFramesInBuffer,
currentFrameIndex;
bool eof;
} decoderAndroidInternals;
// Provides the actual source bytes.
static jint nativeReadAt(JNIEnv *env,
__unused jobject obj,
jlong clientdata,
jlong position,
jbyteArray buffer,
jint offset,
jint size) {
decoderAndroidInternals *internals = (decoderAndroidInternals *)clientdata;
if (internals->dataProvider->tell() != position)
internals->dataProvider->seek(position, SEEK_SET);
jbyte *buf = env->GetByteArrayElements(buffer, NULL);
jint r = (jint)internals->dataProvider->read(buf + offset, 1, (size_t)size);
env->ReleaseByteArrayElements(buffer, buf, 0);
return r;
}
static jlong nativeGetSize(__unused JNIEnv *env, __unused jobject obj, jlong clientdata) {
decoderAndroidInternals *internals = (decoderAndroidInternals *)clientdata;
return internals->dataProvider->size();
}
static JNINativeMethod nativeMethods[] = {
{"nativeReadAt", "(JJ[BII)I", (void *)nativeReadAt},
{"nativeGetSize", "(J)J", (void *)nativeGetSize},
};
// Finds our Decoder class in Java.
const char *DecoderAndroidImplementation::initJavaOnAppLaunch(JNIEnv *javaEnvironment,
jobject activityObject) {
if (javaEnvironment->GetJavaVM(&javaVM) != 0) return "Can't get Java VM.";
// Get the class loader from the activity.
jclass activityClass = javaEnvironment->GetObjectClass(activityObject);
if (!activityClass) return "Can't get the activity's class.";
jmethodID getClassLoader =
javaEnvironment->GetMethodID(activityClass, "getClassLoader", "()Ljava/lang/ClassLoader;");
if (!getClassLoader) return "Can't get getClassLoader.";
jobject cls = javaEnvironment->CallObjectMethod(activityObject, getClassLoader);
if (!cls) return "Can't get cls.";
jclass classLoader = javaEnvironment->FindClass("java/lang/ClassLoader");
if (!classLoader) return "Can't get ClassLoader.";
jmethodID findClass = javaEnvironment->GetMethodID(
classLoader, "loadClass", "(Ljava/lang/String;)Ljava/lang/Class;");
if (!findClass) return "Can't get loadClass.";
// Find our Decoder class.
jstring javaClassName = javaEnvironment->NewStringUTF("com.spotify.NFDecoder.Decoder");
decoderClass = (jclass)javaEnvironment->CallObjectMethod(cls, findClass, javaClassName);
if (!decoderClass) return "Can't find the Decoder class.";
decoderClass = (jclass)javaEnvironment->NewGlobalRef(decoderClass);
if (!decoderClass) return "Can't make the Decoder class global.";
// Get the methods and parameters of our Decoder class.
samplerateFieldID = javaEnvironment->GetFieldID(decoderClass, "samplerate", "I");
if (!samplerateFieldID) return "Can't find the samplerate field.";
channelFieldID = javaEnvironment->GetFieldID(decoderClass, "numberOfChannels", "I");
if (!channelFieldID) return "Can't find the numberOfChannels field.";
durationFieldID = javaEnvironment->GetFieldID(decoderClass, "durationFrames", "J");
if (!durationFieldID) return "Can't find the durationFrames field.";
errorMethodID =
javaEnvironment->GetMethodID(decoderClass, "getLastError", "()Ljava/lang/String;");
if (!errorMethodID) return "Can't find the getLastError method.";
decodeMethodID =
javaEnvironment->GetMethodID(decoderClass, "decodeOnePacket", "(Ljava/nio/ByteBuffer;)I");
if (!decodeMethodID) return "Can't find the decode method.";
seekMethodID = javaEnvironment->GetMethodID(decoderClass, "seek", "(I)Z");
if (!seekMethodID) return "Can't find the seek method.";
// Register the native (C++) methods of our Decoder class.
if (javaEnvironment->RegisterNatives(
decoderClass, nativeMethods, sizeof(nativeMethods) / sizeof(JNINativeMethod)) != 0)
return "RegisterNatives failed.";
return NULL;
}
static JNIEnv *getJavaEnvironment() {
JNIEnv *javaEnvironment;
return javaVM->AttachCurrentThread(&javaEnvironment, NULL) == JNI_OK ? javaEnvironment : NULL;
}
// Creates a Decoder instance in Java.
static const char *createJavaDecoder(decoderAndroidInternals *internals, JNIEnv **javaEnvironment) {
*javaEnvironment = getJavaEnvironment();
if (!(*javaEnvironment)) return "Can't attach current thread to Java.";
jmethodID constructor = (*javaEnvironment)->GetMethodID(decoderClass, "<init>", "(J)V");
if (!constructor) return "Can't get the Java Decoder constructor.";
internals->javaDecoder = (*javaEnvironment)->NewObject(decoderClass, constructor, internals);
if (!internals->javaDecoder) return "Java Decoder constructor failed.";
internals->javaDecoder = (*javaEnvironment)->NewGlobalRef(internals->javaDecoder);
if (!internals->javaDecoder) return "Can't make the Decoder instance global.";
return NULL;
}
DecoderAndroidImplementation::DecoderAndroidImplementation(
std::shared_ptr<DataProvider> dataProvider) {
internals = new decoderAndroidInternals;
memset(internals, 0, sizeof(decoderAndroidInternals));
internals->dataProvider = dataProvider;
internals->eof = false;
internals->bufferCapacityFrames = 4096;
}
DecoderAndroidImplementation::~DecoderAndroidImplementation() {
if (internals->javaDecoder) {
JNIEnv *javaEnvironment = getJavaEnvironment();
if (javaEnvironment) javaEnvironment->DeleteGlobalRef(internals->javaDecoder);
}
if (internals->floatBuffer) free(internals->floatBuffer);
if (internals->intBuffer) free(internals->intBuffer);
delete internals;
}
void DecoderAndroidImplementation::load(const ERROR_DECODER_CALLBACK &decoder_error_callback,
const LOAD_DECODER_CALLBACK &decoder_load_callback) {
// Create the Java Decoder.
JNIEnv *javaEnvironment = NULL;
const char *error = createJavaDecoder(internals, &javaEnvironment);
if (error) {
decoder_error_callback(error, 0);
decoder_load_callback(false);
return;
}
jstring errStr =
(jstring)javaEnvironment->CallObjectMethod(internals->javaDecoder, errorMethodID, 0);
if (errStr) {
error = javaEnvironment->GetStringUTFChars(errStr, NULL);
if (error) {
decoder_error_callback(error, 0);
decoder_load_callback(false);
javaEnvironment->ReleaseStringUTFChars(errStr, error);
return;
}
}
// Get important metrics.
internals->samplerate = javaEnvironment->GetIntField(internals->javaDecoder, samplerateFieldID);
internals->channels = javaEnvironment->GetIntField(internals->javaDecoder, channelFieldID);
internals->durationFrames =
javaEnvironment->GetLongField(internals->javaDecoder, durationFieldID);
// Allocate internal buffers.
internals->floatBuffer =
(float *)malloc(internals->channels * sizeof(float) * internals->bufferCapacityFrames);
if (!internals->floatBuffer) {
decoder_error_callback("Out of memory.", 0);
decoder_load_callback(false);
return;
}
internals->intBuffer = (short int *)malloc(JAVABUFFERSIZEBYTES);
if (!internals->intBuffer) {
decoder_error_callback("Out of memory.", 0);
decoder_load_callback(false);
return;
}
decoder_load_callback(true);
}
// Returns false on out of memory, true otherwise.
static bool putIntoFloatBuffer(decoderAndroidInternals *internals, int bytesRead) {
int framesRead = bytesRead / (sizeof(short int) * internals->channels);
// Do we have enough space for the new data?
int bufferCapacityFrames = internals->bufferCapacityFrames - internals->bufferWritePosFrames;
if (bufferCapacityFrames < framesRead) {
// Try to wrap first.
if (internals->numFramesInBuffer > 0)
memmove(internals->floatBuffer,
internals->floatBuffer + internals->bufferReadPosFrames * internals->channels,
internals->numFramesInBuffer * internals->channels * sizeof(float));
internals->bufferReadPosFrames = 0;
internals->bufferWritePosFrames = internals->numFramesInBuffer;
// If our buffer is still not big enough, realloc.
bufferCapacityFrames = internals->bufferCapacityFrames - internals->bufferWritePosFrames;
if (bufferCapacityFrames < framesRead) {
int newCapacityFrames = internals->bufferCapacityFrames + framesRead * 2;
float *newBuffer = (float *)realloc(internals->floatBuffer,
newCapacityFrames * internals->channels * sizeof(float));
if (newBuffer) {
internals->floatBuffer = newBuffer;
internals->bufferCapacityFrames = newCapacityFrames;
} else
return false;
}
}
// Copy into our internal buffer.
short int *ints = internals->intBuffer;
float *floats = internals->floatBuffer + internals->bufferWritePosFrames * internals->channels;
int numSamples = framesRead * internals->channels;
static const float multiplier = 1.0f / 32767.0f; // Multiplying is much faster than dividing.
while (numSamples--) *floats++ = float(*ints++) * multiplier;
internals->bufferWritePosFrames += framesRead;
internals->numFramesInBuffer += framesRead;
return true;
}
void DecoderAndroidImplementation::decode(long frames,
const DECODE_CALLBACK &decode_callback,
bool synchronous) {
// Creating the output buffer.
float *outputBuffer = (float *)malloc(frames * internals->channels * sizeof(float));
if (!outputBuffer) {
decode_callback(internals->currentFrameIndex, 0, NULL);
return;
}
JNIEnv *javaEnvironment = NULL;
long framesRead = 0;
while (framesRead < frames) {
// Do we have some frames buffered that we can offer?
long framesFromBuffer = internals->numFramesInBuffer;
if (framesFromBuffer > frames) framesFromBuffer = frames;
if (framesFromBuffer > 0) {
memcpy(outputBuffer + framesRead * internals->channels,
internals->floatBuffer + internals->bufferReadPosFrames * internals->channels,
framesFromBuffer * internals->channels * sizeof(float));
framesRead += framesFromBuffer;
internals->currentFrameIndex += framesFromBuffer;
internals->bufferReadPosFrames += framesFromBuffer;
internals->numFramesInBuffer -= framesFromBuffer;
frames -= framesFromBuffer;
continue;
}
if (internals->eof) break;
if (!javaEnvironment) {
javaEnvironment = getJavaEnvironment();
if (!javaEnvironment) break;
}
// Decode one frame with a Java representation of our int buffer.
jobject javaBuffer =
javaEnvironment->NewDirectByteBuffer(internals->intBuffer, JAVABUFFERSIZEBYTES);
if (!javaBuffer) break;
int bytesRead =
javaEnvironment->CallIntMethod(internals->javaDecoder, decodeMethodID, javaBuffer);
if (bytesRead == 0) { // Error.
jstring errStr =
(jstring)javaEnvironment->CallObjectMethod(internals->javaDecoder, errorMethodID, 0);
if (errStr) {
const char *error = javaEnvironment->GetStringUTFChars(errStr, NULL);
if (error) {
javaEnvironment->ReleaseStringUTFChars(errStr, error);
return;
}
}
break;
} else if (bytesRead == INT_MIN) { // Error and eof.
internals->eof = true;
break;
} else if (bytesRead < 0) { // Read and eof.
internals->eof = true;
if (!putIntoFloatBuffer(internals, -bytesRead)) break;
} else { // Normal read.
internals->eof = false;
if (!putIntoFloatBuffer(internals, bytesRead)) break;
}
}
// Passing the result.
decode_callback(internals->currentFrameIndex, framesRead, outputBuffer);
free(outputBuffer);
}
void DecoderAndroidImplementation::seek(long frame_index) {
if (internals->currentFrameIndex == frame_index) return;
JNIEnv *javaEnvironment = getJavaEnvironment();
if (!javaEnvironment) return;
if (javaEnvironment->CallBooleanMethod(internals->javaDecoder, seekMethodID, frame_index)) {
internals->currentFrameIndex = (int)frame_index;
internals->bufferWritePosFrames = internals->bufferReadPosFrames =
internals->numFramesInBuffer = 0;
internals->eof = false;
}
}
void DecoderAndroidImplementation::flush() {
JNIEnv *javaEnvironment = getJavaEnvironment();
if (!javaEnvironment) return;
javaEnvironment->CallBooleanMethod(
internals->javaDecoder, seekMethodID, internals->currentFrameIndex);
internals->bufferWritePosFrames = internals->bufferReadPosFrames = internals->numFramesInBuffer =
0;
internals->eof = false;
}
double DecoderAndroidImplementation::sampleRate() {
return internals->samplerate;
}
int DecoderAndroidImplementation::channels() {
return internals->channels;
}
const std::string &DecoderAndroidImplementation::path() {
return internals->dataProvider->path();
}
const std::string &DecoderAndroidImplementation::name() {
return domain;
}
long DecoderAndroidImplementation::currentFrameIndex() {
return internals->currentFrameIndex;
}
long DecoderAndroidImplementation::frames() {
return internals->durationFrames;
}
bool DecoderAndroidImplementation::eof() {
return internals->eof;
}
} // namespace decoder
} // namespace nativeformat
#endif