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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/base/android/webaudio_media_codec_bridge.h"
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
#include "base/android/jni_android.h"
#include "base/android/jni_array.h"
#include "base/android/jni_string.h"
#include "base/basictypes.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/posix/eintr_wrapper.h"
#include "base/stl_util.h"
#include "jni/WebAudioMediaCodecBridge_jni.h"
#include "media/base/android/webaudio_media_codec_info.h"
using base::android::AttachCurrentThread;
namespace media {
void WebAudioMediaCodecBridge::RunWebAudioMediaCodec(
base::SharedMemoryHandle encoded_audio_handle,
base::FileDescriptor pcm_output,
uint32_t data_size) {
WebAudioMediaCodecBridge bridge(encoded_audio_handle, pcm_output, data_size);
bridge.DecodeInMemoryAudioFile();
}
WebAudioMediaCodecBridge::WebAudioMediaCodecBridge(
base::SharedMemoryHandle encoded_audio_handle,
base::FileDescriptor pcm_output,
uint32_t data_size)
: encoded_audio_handle_(encoded_audio_handle),
pcm_output_(pcm_output.fd),
data_size_(data_size) {
DVLOG(1) << "WebAudioMediaCodecBridge start **********************"
<< " output fd = " << pcm_output.fd;
}
WebAudioMediaCodecBridge::~WebAudioMediaCodecBridge() {
if (close(pcm_output_)) {
DVLOG(1) << "Couldn't close output fd " << pcm_output_
<< ": " << strerror(errno);
}
}
int WebAudioMediaCodecBridge::SaveEncodedAudioToFile(
JNIEnv* env,
jobject context) {
// Create a temporary file where we can save the encoded audio data.
std::string temporaryFile =
base::android::ConvertJavaStringToUTF8(
env,
Java_WebAudioMediaCodecBridge_createTempFile(env, context).obj());
// Open the file and unlink it, so that it will be actually removed
// when we close the file.
base::ScopedFD fd(open(temporaryFile.c_str(), O_RDWR));
if (unlink(temporaryFile.c_str())) {
VLOG(0) << "Couldn't unlink temp file " << temporaryFile
<< ": " << strerror(errno);
}
if (!fd.is_valid()) {
return -1;
}
// Create a local mapping of the shared memory containing the
// encoded audio data, and save the contents to the temporary file.
base::SharedMemory encoded_data(encoded_audio_handle_, true);
if (!encoded_data.Map(data_size_)) {
VLOG(0) << "Unable to map shared memory!";
return -1;
}
if (static_cast<uint32_t>(write(fd.get(), encoded_data.memory(), data_size_))
!= data_size_) {
VLOG(0) << "Failed to write all audio data to temp file!";
return -1;
}
lseek(fd.get(), 0, SEEK_SET);
return fd.release();
}
bool WebAudioMediaCodecBridge::DecodeInMemoryAudioFile() {
JNIEnv* env = AttachCurrentThread();
CHECK(env);
jobject context = base::android::GetApplicationContext();
int sourceFd = SaveEncodedAudioToFile(env, context);
if (sourceFd < 0)
return false;
jboolean decoded = Java_WebAudioMediaCodecBridge_decodeAudioFile(
env,
context,
reinterpret_cast<intptr_t>(this),
sourceFd,
data_size_);
close(sourceFd);
DVLOG(1) << "decoded = " << (decoded ? "true" : "false");
return decoded;
}
void WebAudioMediaCodecBridge::InitializeDestination(
JNIEnv* env,
jobject /*java object*/,
jint channel_count,
jint sample_rate,
jlong duration_microsec) {
// Send information about this audio file: number of channels,
// sample rate (Hz), and the number of frames.
struct WebAudioMediaCodecInfo info = {
static_cast<unsigned long>(channel_count),
static_cast<unsigned long>(sample_rate),
// The number of frames is the duration of the file
// (in microseconds) times the sample rate.
static_cast<unsigned long>(
0.5 + (duration_microsec * 0.000001 *
sample_rate))
};
DVLOG(1) << "InitializeDestination:"
<< " channel count = " << channel_count
<< " rate = " << sample_rate
<< " duration = " << duration_microsec << " microsec";
HANDLE_EINTR(write(pcm_output_, &info, sizeof(info)));
}
void WebAudioMediaCodecBridge::OnChunkDecoded(
JNIEnv* env,
jobject /*java object*/,
jobject buf,
jint buf_size,
jint input_channel_count,
jint output_channel_count) {
if (buf_size <= 0 || !buf)
return;
int8_t* buffer =
static_cast<int8_t*>(env->GetDirectBufferAddress(buf));
size_t count = static_cast<size_t>(buf_size);
std::vector<int16_t> decoded_data;
if (input_channel_count == 1 && output_channel_count == 2) {
// See crbug.com/266006. The file has one channel, but the
// decoder decided to return two channels. To be consistent with
// the number of channels in the file, only send one channel (the
// first).
int16_t* data = static_cast<int16_t*>(env->GetDirectBufferAddress(buf));
int frame_count = buf_size / sizeof(*data) / 2;
decoded_data.resize(frame_count);
for (int k = 0; k < frame_count; ++k) {
decoded_data[k] = *data;
data += 2;
}
buffer = reinterpret_cast<int8_t*>(vector_as_array(&decoded_data));
DCHECK(buffer);
count = frame_count * sizeof(*data);
}
// Write out the data to the pipe in small chunks if necessary.
while (count > 0) {
int bytes_to_write = (count >= PIPE_BUF) ? PIPE_BUF : count;
ssize_t bytes_written = HANDLE_EINTR(write(pcm_output_,
buffer,
bytes_to_write));
if (bytes_written == -1)
break;
count -= bytes_written;
buffer += bytes_written;
}
}
bool WebAudioMediaCodecBridge::RegisterWebAudioMediaCodecBridge(JNIEnv* env) {
return RegisterNativesImpl(env);
}
} // namespace
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