ZLMediaKit/player/AudioSRC.cpp

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/*
* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
*
* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
*
* Use of this source code is governed by MIT license that can be found in the
* LICENSE file in the root of the source tree. All contributing project authors
* may be found in the AUTHORS file in the root of the source tree.
*/
#include "Util/logger.h"
#include "AudioSRC.h"
#include "SDLAudioDevice.h"
using namespace std;
using namespace toolkit;
AudioSRC::AudioSRC(AudioSRCDelegate *del) {
_delegate = del;
}
AudioSRC::~AudioSRC() {}
void AudioSRC::setOutputAudioConfig(const SDL_AudioSpec &cfg) {
int freq = _delegate->getPCMSampleRate();
int format = _delegate->getPCMFormat();
int channels = _delegate->getPCMChannel();
if (-1 == SDL_BuildAudioCVT(&_audio_cvt, format, channels, freq, cfg.format, cfg.channels, cfg.freq)) {
throw std::runtime_error("the format conversion is not supported");
}
InfoL << "audio cvt origin format, freq:" << freq << ", format:" << hex << format << dec << ", channels:" << channels;
InfoL << "audio cvt info, "
<< "needed:" << _audio_cvt.needed
<< ", src_format:" << hex << _audio_cvt.src_format
<< ", dst_format:" << _audio_cvt.dst_format << dec
<< ", rate_incr:" << _audio_cvt.rate_incr
<< ", len_mult:" << _audio_cvt.len_mult
<< ", len_ratio:" << _audio_cvt.len_ratio;
}
void AudioSRC::setEnableMix(bool flag) {
_enabled = flag;
}
int AudioSRC::getPCMData(char *buf, int size) {
if (!_enabled) {
return 0;
}
if (!_audio_cvt.needed) {
//获取原始数据,不需要频率转换
return _delegate->getPCMData(buf, size);
}
if ((int)(size / _audio_cvt.len_ratio) != _origin_size) {
_origin_size = size / _audio_cvt.len_ratio;
_origin_buf.reset(new char[std::max(_origin_size, size)], [](char *ptr) {
delete[] ptr;
});
InfoL << "origin pcm buffer size is:" << _origin_size << ", target pcm buffer size is:" << size;
}
auto origin_size = _delegate->getPCMData(_origin_buf.get(), _origin_size);
if (!origin_size) {
//获取数据失败
TraceL << "get empty pcm data";
return 0;
}
_audio_cvt.buf = (Uint8 *) _origin_buf.get();
_audio_cvt.len = origin_size;
if (0 != SDL_ConvertAudio(&_audio_cvt)) {
WarnL << "SDL_ConvertAudio failed!";
_audio_cvt.len_cvt = 0;
}
if (_audio_cvt.len_cvt) {
_target_buf.append(_origin_buf.get(), _audio_cvt.len_cvt);
}
if (_target_buf.size() < size) {
return 0;
}
memcpy(buf, _target_buf.data(), size);
_target_buf.erase(0, size);
return size;
}
////////////////////////////////////////////////////////////////////////
AudioPlayer::AudioPlayer() : AudioSRC(this) {
_device = SDLAudioDevice::Instance().shared_from_this();
}
AudioPlayer::~AudioPlayer() {
_device->delChannel(this);
}
void AudioPlayer::setup(int sample_rate, int channel, SDL_AudioFormat format) {
_sample_rate = sample_rate;
_channel = channel;
_format = format;
_device->addChannel(this);
}
SDL_AudioFormat AudioPlayer::getPCMFormat() {
return _format;
}
int AudioPlayer::getPCMSampleRate() {
return _sample_rate;
}
int AudioPlayer::getPCMChannel() {
return _channel;
}
int AudioPlayer::getPCMData(char *buf, int size) {
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lock_guard<mutex> lck(_mtx);
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if (_buffer.size() < size) {
return 0;
}
memcpy(buf, _buffer.data(), size);
_buffer.erase(0, size);
return size;
}
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void AudioPlayer::inputFrame(const char *data, size_t size) {
lock_guard<mutex> lck(_mtx);
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_buffer.append(data, size);
}