使用 ALSA 的函数 snd_pcm_writei 可以立即释放样本缓冲区吗？
使用ALSA播放音频，调用snd__pcm__writei后，可以立即释放声音样本缓冲区还是需要等到声音播放完毕才能释放样本缓冲区？
例如：
unsigned short *buffer;
buffer = malloc(size of sample to play);
...load data into buffer...
snd_pcm_writei (playback_handle, buffer, size of sample)
free(buffer)
Using ALSA to play audio, after calling snd__pcm__writei, can I free the sound sample buffer right away or do I need to wait until the sound is finished playing before I can free the sample buffer?
For example:
unsigned short *buffer;
buffer = malloc(size of sample to play);
...load data into buffer...
snd_pcm_writei (playback_handle, buffer, size of sample)
free(buffer)
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最简单的找出方法是从缓冲区末尾开始向后写入，看看是否影响音频播放。如果你这样做了，那么你肯定无法释放缓冲区。如果没有什么区别，那么您可以安全地释放缓冲区，因为声卡不会从该特定的内存块中读取数据。
Easiest way to find out would be to start writing backwards from the end of the buffer and see if you affect the audio playback. If you do then you definitely can't free the buffer. If it makes no difference then you can safely free the buffer as the sound card is not reading from that particular block of memory.