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修复sdl音频重采样内存越界的bug以及修复重采样爆音bug

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This commit is contained in:
ziyue 2021-09-02 15:47:08 +08:00
parent 186c15364a
commit 895dc04fcc
2 changed files with 19 additions and 11 deletions
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26
player/AudioSRC.cpp
View File

@ -51,29 +51,37 @@ int AudioSRC::getPCMData(char *buf, int size) {
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;
//对应的未转换前pcm的长度
auto original_size = (int) (size / _audio_cvt.len_ratio);
if (original_size % 4 != 0) {
//必须为4byte的整数(双通道16bit一个采样就4个字节)
original_size = 4 * (original_size / 4) + 4;
}
auto origin_size = _delegate->getPCMData(_origin_buf.get(), _origin_size);
//需要准备这么长的buf用于重采样
if ((int) (original_size * _audio_cvt.len_mult) != _buf_size) {
_buf_size = original_size * _audio_cvt.len_mult;
_buf.reset(new char[_buf_size], [](char *ptr) {
delete[] ptr;
});
InfoL << "origin pcm buffer size is:" << original_size << ", target pcm buffer size is:" << size;
}
auto origin_size = _delegate->getPCMData(_buf.get(), original_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.buf = (Uint8 *) _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);
_target_buf.append(_buf.get(), _audio_cvt.len_cvt);
}
if (_target_buf.size() < size) {
return 0;

4
player/AudioSRC.h
View File

@ -55,8 +55,8 @@ public:
private:
bool _enabled = true;
int _origin_size = 0;
std::shared_ptr<char> _origin_buf;
int _buf_size = 0;
std::shared_ptr<char> _buf;
AudioSRCDelegate *_delegate = nullptr;
BufferLikeString _target_buf;
SDL_AudioCVT _audio_cvt;