mirror of
https://github.com/DrKLO/Telegram.git
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169 lines
5.5 KiB
C++
169 lines
5.5 KiB
C++
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <jni.h>
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#include <cstdlib>
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#include "include/flac_parser.h"
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#define DECODER_FUNC(RETURN_TYPE, NAME, ...) \
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RETURN_TYPE Java_org_telegram_messenger_exoplayer2_ext_flac_FlacDecoderJni_##NAME(JNIEnv *env, jobject thiz, ##__VA_ARGS__)
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class JavaDataSource : public DataSource {
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public:
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void setFlacDecoderJni(JNIEnv *env, jobject flacDecoderJni) {
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this->env = env;
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this->flacDecoderJni = flacDecoderJni;
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if (mid == NULL) {
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jclass cls = env->GetObjectClass(flacDecoderJni);
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mid = env->GetMethodID(cls, "read", "(Ljava/nio/ByteBuffer;)I");
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env->DeleteLocalRef(cls);
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}
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}
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ssize_t readAt(off64_t offset, void *const data, size_t size) {
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jobject byteBuffer = env->NewDirectByteBuffer(data, size);
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int result = env->CallIntMethod(flacDecoderJni, mid, byteBuffer);
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if (env->ExceptionCheck()) {
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// Exception is thrown in Java when returning from the native call.
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result = -1;
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}
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env->DeleteLocalRef(byteBuffer);
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return result;
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}
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private:
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JNIEnv *env;
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jobject flacDecoderJni;
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jmethodID mid;
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};
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struct Context {
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JavaDataSource *source;
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FLACParser *parser;
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Context() {
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source = new JavaDataSource();
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parser = new FLACParser(source);
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}
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~Context() {
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delete parser;
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delete source;
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}
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};
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extern "C" {
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DECODER_FUNC(jlong, flacInit) {
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Context *context = new Context;
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if (!context->parser->init()) {
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delete context;
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return 0;
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}
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return reinterpret_cast<intptr_t>(context);
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}
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DECODER_FUNC(jobject, flacDecodeMetadata, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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context->source->setFlacDecoderJni(env, thiz);
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if (!context->parser->decodeMetadata()) {
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return NULL;
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}
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const FLAC__StreamMetadata_StreamInfo &streamInfo =
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context->parser->getStreamInfo();
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jclass cls = env->FindClass("org/telegram/messenger/exoplayer2/util/FlacStreamInfo");
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jmethodID constructor = env->GetMethodID(cls, "<init>", "(IIIIIIIJ)V");
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return env->NewObject(cls, constructor, streamInfo.min_blocksize,
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streamInfo.max_blocksize, streamInfo.min_framesize,
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streamInfo.max_framesize, streamInfo.sample_rate,
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streamInfo.channels, streamInfo.bits_per_sample,
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streamInfo.total_samples);
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}
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DECODER_FUNC(jint, flacDecodeToBuffer, jlong jContext, jobject jOutputBuffer) {
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Context *context = reinterpret_cast<Context *>(jContext);
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context->source->setFlacDecoderJni(env, thiz);
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void *outputBuffer = env->GetDirectBufferAddress(jOutputBuffer);
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jint outputSize = env->GetDirectBufferCapacity(jOutputBuffer);
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return context->parser->readBuffer(outputBuffer, outputSize);
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}
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DECODER_FUNC(jint, flacDecodeToArray, jlong jContext, jbyteArray jOutputArray) {
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Context *context = reinterpret_cast<Context *>(jContext);
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context->source->setFlacDecoderJni(env, thiz);
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jbyte *outputBuffer = env->GetByteArrayElements(jOutputArray, NULL);
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jint outputSize = env->GetArrayLength(jOutputArray);
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int count = context->parser->readBuffer(outputBuffer, outputSize);
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env->ReleaseByteArrayElements(jOutputArray, outputBuffer, 0);
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return count;
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}
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DECODER_FUNC(jlong, flacGetDecodePosition, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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return context->parser->getDecodePosition();
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}
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DECODER_FUNC(jlong, flacGetLastFrameTimestamp, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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return context->parser->getLastFrameTimestamp();
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}
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DECODER_FUNC(jlong, flacGetLastFrameFirstSampleIndex, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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return context->parser->getLastFrameFirstSampleIndex();
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}
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DECODER_FUNC(jlong, flacGetNextFrameFirstSampleIndex, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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return context->parser->getNextFrameFirstSampleIndex();
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}
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DECODER_FUNC(jlong, flacGetSeekPosition, jlong jContext, jlong timeUs) {
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Context *context = reinterpret_cast<Context *>(jContext);
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return context->parser->getSeekPosition(timeUs);
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}
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DECODER_FUNC(jstring, flacGetStateString, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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const char *str = context->parser->getDecoderStateString();
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return env->NewStringUTF(str);
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}
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DECODER_FUNC(jboolean, flacIsDecoderAtEndOfStream, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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return context->parser->isDecoderAtEndOfStream();
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}
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DECODER_FUNC(void, flacFlush, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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context->parser->flush();
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}
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DECODER_FUNC(void, flacReset, jlong jContext, jlong newPosition) {
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Context *context = reinterpret_cast<Context *>(jContext);
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context->parser->reset(newPosition);
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}
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DECODER_FUNC(void, flacRelease, jlong jContext) {
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Context *context = reinterpret_cast<Context *>(jContext);
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delete context;
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}
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}
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