add: 增加Audio相关代码

tests/Audio/SDLAudioMixer/AudioSRC.cpp

@@ -0,0 +1,72 @@
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include "SDL2/SDL.h"
+#include "libavcodec/avcodec.h"
+#ifdef __cplusplus
+}
+#endif
+
+#include "Util/logger.h"
+#include "AudioSRC.h"
+#include <stdexcept>
+
+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->getPCMSampleBit() == 16 ? AUDIO_S16 : AUDIO_S8;
+	int channels = _delegate->getPCMChannel();
+	if(-1 == SDL_BuildAudioCVT(&_audioCvt,format,channels,freq,cfg.format,cfg.channels,cfg.freq)){
+		throw std::runtime_error("the format conversion is not supported");
+	}
+	InfoL << freq << " " << format << " " << channels ;
+	InfoL 	<< _audioCvt.needed << " "
+			<< _audioCvt.src_format << " "
+			<< _audioCvt.dst_format << " "
+			<< _audioCvt.rate_incr << " "
+			<< _audioCvt.len_mult << " "
+			<< _audioCvt.len_ratio << " ";
+}
+void AudioSRC::setEnableMix(bool flag){
+	_enableMix = flag;
+}
+int AudioSRC::getPCMData(char* buf, int bufsize) {
+	if(!_enableMix){
+		return 0;
+	}
+	if(!_pcmSize){
+		_pcmSize =	bufsize / _audioCvt.len_ratio;
+		_delegate->setPCMBufferSize(_pcmSize);
+	}
+	if(!_delegate->getPCMData(buf,_pcmSize)){
+		return 0;
+	}
+	_audioCvt.buf = (Uint8 *)buf;
+	_audioCvt.len = _pcmSize;
+	if(0 != SDL_ConvertAudio(&_audioCvt)){
+		_audioCvt.len_cvt = 0;
+		TraceL << "SDL_ConvertAudio falied";
+	}
+    //return _audioCvt.len_cvt;
+    if(_audioCvt.len_cvt == bufsize)
+    {
+		return bufsize;
+	}
+	if(_audioCvt.len_cvt){
+		_pcmBuf.append(buf,_audioCvt.len_cvt);
+	}
+	if(_pcmBuf.size() < bufsize){
+		return 0;
+	}
+	memcpy(buf,_pcmBuf.data(),bufsize);
+	_pcmBuf.erase(0,bufsize);
+	return bufsize;
+}