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mailmail9116
mailmail9116
Associate III
February 4, 2013
Question

Play mono on stereo channel

  • February 4, 2013
  • 1 reply
  • 666 views
Posted on February 04, 2013 at 16:29

Hi , as quoted from the audio implemination of stm32f4 eval : 

Mono audio streaming is not supported (in order to play mono audio streams, each data should be sent twice <
br
>on the I2S or should be duplicated on the source buffer. Or convert the stream in stereo before playing).

I cannot find any example or explanation on how to do it,does anyone have any clue how can i implement it? I have mono files with frequency of 44100 ,and i want to play them with the same frequncey on stereo channel. Thanks Michael
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    1 reply

    Tesla DeLorean
    Tesla DeLorean
    Guru
    February 4, 2013
    Posted on February 04, 2013 at 16:39 

    // Duplicate the mono sample in both left and right channels
int16_t m[100]; // 100 mono samples
int16_t s[100 * 2]; // 100 stereo samples left/right channels interleaved
int i;
for(i=0; i<100; i++)
s[(i << 1) + 0] = s[(i << 1) + 1] = m[i]; // left[i] = right[i] = mono[i]

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