我使用PortAudio V19-devel(pa_stable_v19_20140130)来合成文本转语音引擎的输出。
首先,我使用PaStreamFinishedCallback (void *userData)
注册了一个函数,以便在音频流变为非活动状态时调用它。
根据Stream State Machine,当处于状态“Active”(换句话说是处理音频数据的回调)并返回paAbort
时,我们触发转换到状态“Callback finished”取消所有缓冲区后,Pa_IsStreamActive
返回0。
不幸的是我不知道如何做到这一点,因为Pa_IsStreamActive
在paAbort
之后返回1。问题是如何确定所有缓冲区都已被取消?您可以在下面找到我的代码的相应片段:
int AudioConnection::onAudioDataReceived (const void *input, void *output,
unsigned long frames, const PaStreamCallbackTimeInfo *time,
PaStreamCallbackFlags status, void *userdata
) {
int finished;
unsigned int i;
AudioConnection *data = (AudioConnection *)userdata;
unsigned int framesLeft = data->numFrames - data->cursor;
int8_t *out = (int8_t *)output;
// Declared to prevent unused variable warnings
(void) time; (void) input; (void) status;
if (framesLeft >= frames) {
for (i = 0; i < frames; i++) {
*out++ = data->audioSamples[data->cursor++];
*out++ = data->audioSamples[data->cursor++];
}
data->cursor += frames;
finished = paContinue;
}
else if (framesLeft == 0) {
*out++ = 0;
*out++ = 0;
data->cursor = 0;
finished = paAbort;
}
// final buffer
else if (framesLeft < frames) {
for (i = 0; i < framesLeft; i++) {
*out++ = data->audioSamples[data->cursor++];
*out++ = data->audioSamples[data->cursor++];
}
data->cursor = 0;
finished = paComplete;
}
// should never happen
else {
finished = paAbort;
}
return finished;
}
这是我的回调代码,在音频流完成后调用:
void AudioConnection::onAudioStreamFinished (void *userdata) {
AudioConnection *data = (AudioConnection *) userdata;
ACE_DEBUG ((LM_TRACE, ACE_TEXT ("(%t | %P | %D | %N) AudioConnection::onAudioStreamFinished ()\n")));
ACE_DEBUG ((LM_TRACE, ACE_TEXT ("(%t | %P | %D | %N) AudioConnection::isAudioStreamActive () = %d \n"), data->isAudioStreamActive ()));
}
和
bool AudioConnection::isAudioStreamActive () {
return Pa_IsStreamActive (audioStream) ? true : false;
}
以下跟踪表明问题 - 我希望最后一行中的isAudioStreamActive
返回0.对此的任何反馈都表示赞赏。谢谢!
(1987417168 | 19339 | 2016-09-27 23:10:30.935040 | ../src/AudioConnection.cpp) AudioConnection::isAudioStreamActive () = 0
(1987417168 | 19339 | 2016-09-27 23:10:30.936162 | ../src/AudioConnection.cpp) AudioConnection::playAudioStream ()
(1954542672 | 19339 | 2016-09-27 23:10:30.977247 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 27648
(1954542672 | 19339 | 2016-09-27 23:10:31.007114 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 26112
(1954542672 | 19339 | 2016-09-27 23:10:31.037122 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 24576
(1954542672 | 19339 | 2016-09-27 23:10:31.067106 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 23040
(1954542672 | 19339 | 2016-09-27 23:10:31.097107 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 21504
(1954542672 | 19339 | 2016-09-27 23:10:31.137147 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 19968
(1954542672 | 19339 | 2016-09-27 23:10:31.187113 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 18432
(1954542672 | 19339 | 2016-09-27 23:10:31.237124 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 16896
(1954542672 | 19339 | 2016-09-27 23:10:31.287146 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 15360
(1954542672 | 19339 | 2016-09-27 23:10:31.337112 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 13824
(1954542672 | 19339 | 2016-09-27 23:10:31.387106 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 12288
(1954542672 | 19339 | 2016-09-27 23:10:31.437225 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 10752
(1954542672 | 19339 | 2016-09-27 23:10:31.487161 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 9216
(1954542672 | 19339 | 2016-09-27 23:10:31.537158 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 7680
(1954542672 | 19339 | 2016-09-27 23:10:31.587206 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 6144
(1954542672 | 19339 | 2016-09-27 23:10:31.637156 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 4608
(1954542672 | 19339 | 2016-09-27 23:10:31.687188 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 3072
(1954542672 | 19339 | 2016-09-27 23:10:31.737236 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 1536
(1954542672 | 19339 | 2016-09-27 23:10:31.787165 | ../src/AudioConnection.cpp) AudioConnection framesLeft: 0 .......silence.
(1954542672 | 19339 | 2016-09-27 23:10:31.787428 | ../src/AudioConnection.cpp) AudioConnection::onAudioStreamFinished ()
(1954542672 | 19339 | 2016-09-27 23:10:31.787736 | ../src/AudioConnection.cpp) AudioConnection::isAudioStreamActive () = 1
答案 0 :(得分:0)
Pa_IsStreamActive
的结果取决于您使用的主机。它在paAbort
之后返回1并不令人惊讶,因为这意味着发生异常并且PortAudio应该立即退出。在这种情况下,您最有可能想要使用paComplete
。我想你想要framesLeft <= frames
作为“最终缓冲区”。