使用 Speex 和 DirectSound 进行声学回声消除 (AEC)
我正在尝试使用 Speex 编解码器库执行声学回声消除 (AEC)。 根据 Speex 文档，我需要执行两次调用：
speex_echo_playback(echo_state, echo_frame);
每次播放音频帧时以及
speex_echo_capture(echo_state, input_frame, output_frame);
捕获每个帧时。
由于我使用的是 DirectSound，我想我可以在调用 speex_echo_playback 时使用主 DirectSound 缓冲区作为 echo_frame，例如，
DWORD offset = 0;
DWORD length = 0;
LPVOID block1, block2;
DWORD length1, length2;
DWORD flags = DSBLOCK_ENTIREBUFFER;
HRESULT hr = primary_buffer->Lock(
offset
, length
, &block1
, &length1
, &block2
, &length2
, flags
);
// Would like to convert the buffer into a form that
// speex_echo_capture() can use.
// Why does length1 == length2 == 0 always?
hr = primary_buffer->Unlock( block1, length1, block2, length2 );
文档确实说这些是只写指针，但无论如何都不能使用缓冲区数据我？
这基本上就是我创建缓冲区的方式：
CComPtr< IDirectSoundBuffer > primary_buffer;
DSBUFFERDESC primarydesc = { sizeof( DSBUFFERDESC ),
DSBCAPS_PRIMARYBUFFER | DSBCAPS_CTRL3D | DSBCAPS_LOCHARDWARE,
0, 0, NULL, DS3DALG_HRTF_LIGHT };
HRESULT hr = directsound_->CreateSoundBuffer(
&primarydesc, &primary_buffer, NULL );
似乎使用 DirectSound 缓冲区本身的替代方法是使用 speex_decode() 的输出并进行我自己的软件混合。
对于让 Speex 和 DirectSound 协同工作有什么建议或建议吗？ 谢谢你的帮助。
I am trying to perform Acoustic Echo Cancellation (AEC) with the Speex codec library. According to the Speex documentation, I need to perform two calls:
speex_echo_playback(echo_state, echo_frame);
every time an audio frame is played, and
speex_echo_capture(echo_state, input_frame, output_frame);
for every frame captured.
Since I am using DirectSound, I was thinking that I could use the primary DirectSound buffer as the echo_frame in the call to speex_echo_playback, e.g.,
DWORD offset = 0;
DWORD length = 0;
LPVOID block1, block2;
DWORD length1, length2;
DWORD flags = DSBLOCK_ENTIREBUFFER;
HRESULT hr = primary_buffer->Lock(
offset
, length
, &block1
, &length1
, &block2
, &length2
, flags
);
// Would like to convert the buffer into a form that
// speex_echo_capture() can use.
// Why does length1 == length2 == 0 always?
hr = primary_buffer->Unlock( block1, length1, block2, length2 );
The documentation does say that these are write-only pointers, but is there not anyway to use the buffer data myself?
This is basically how I am creating the buffer:
CComPtr< IDirectSoundBuffer > primary_buffer;
DSBUFFERDESC primarydesc = { sizeof( DSBUFFERDESC ),
DSBCAPS_PRIMARYBUFFER | DSBCAPS_CTRL3D | DSBCAPS_LOCHARDWARE,
0, 0, NULL, DS3DALG_HRTF_LIGHT };
HRESULT hr = directsound_->CreateSoundBuffer(
&primarydesc, &primary_buffer, NULL );
The alternative, it seems, to using the DirectSound buffer itself is to use the output of speex_decode() and do my own software mixing.
Any pointers or suggestions for getting Speex and DirectSound to work together? Thanks for any help.
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我曾经做过一次。 但我的方法如下：
我从未直接使用过主缓冲区。 相反，我只使用一个辅助缓冲区。 我有两个线程 - 播放线程和捕获线程。 另外，我还使用了另一个 speex 函数 - speex_echo_cancellation。
因此，在我的播放线程中，我将当前播放帧保存在全局缓冲区中，并在名为 speex_echo_cancellation 函数的捕获线程中保存当前捕获帧和先前存储的播放帧。
DMO 不适合我，因为我还必须支持 Windows XP。
您还可以查看 - speex 邮件列表存档 或更好的在此处订阅以获取更多有趣的信息。
祝你好运，
安东尼
I've done this once. But my approach was the following:
I've never used Primary buffer directly. Instead, I worked only with one secondary buffer. I had two threads - playback thread and capture thread. Also, I've used another speex function - speex_echo_cancellation.
Thus, in my playback thread I've saved current playback frame in a global buffer and in capture thread called speex_echo_cancellation function with currect capture frame and previously stored playback frame.
DMO was not applicable for me because I had to support Windows XP also.
You can also look throug - speex mailing lists archive or better even subscribe here to get more interesting info.
Good luck,
Anthony