无法播放pcm>带有AndroidSimpleBufferQueue的60kb [英] Cannot play pcm > 60kb with the AndroidSimpleBufferQueue

问题描述

我已经初始化了一个AndroidSimpleBufferQueue，例如值:

I've initialized an AndroidSimpleBufferQueue such as values:

SLDataLocator_AndroidSimpleBufferQueue bufferLocator = {
  SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2};
SLDataFormat_PCM pcmFormat = {
  SL_DATAFORMAT_PCM,           1,
  SL_SAMPLINGRATE_44_1,        SL_PCMSAMPLEFORMAT_FIXED_16,
  SL_PCMSAMPLEFORMAT_FIXED_16, SL_SPEAKER_FRONT_CENTER,
  SL_BYTEORDER_LITTLEENDIAN};

SLDataSource            audioSource      = {&bufferLocator, &pcmFormat};
SLDataLocator_OutputMix locatorOutputMix = {SL_DATALOCATOR_OUTPUTMIX,
                                            outputMixObj.getObject()};
SLDataSink audioSink = {&locatorOutputMix, nullptr};
[...]

然后，当我需要播放声音时，例如:

Then when I need to play a sound I enqueue such as:

bufferQueue->Enqueue(bufferQueue, (uint8_t*)buffer.data(),
          buffer.size())

它对于小于60k的缓冲区效果很好，但是当缓冲区较大时，则不会播放声音，有时甚至只是伪像.

It works well for buffer smaller than 60k however when the buffer is bigger no sound are played or sometime just an artifact.

推荐答案

从规格:

已排队的缓冲区就位使用，不需要 由设备复制，尽管这可能是 与实施有关.应用程序开发人员应注意 在缓冲区排队后修改缓冲区的内容是 未定义并会导致音频损坏

The buffers that are queued are used in place and are not required to be copied by the device, although this may be implementation-dependent. The application developer should be aware that modifying the content of a buffer after it has been queued is undefined and can cause audio corruption

因此，内存必须保持有效，直到声音完全播放为止.

So the memory must remains valid until the sound fully played.

阅读文档，并注意意外的结构副本:)

这篇关于无法播放pcm>带有AndroidSimpleBufferQueue的60kb的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！