Posted on December 04, 2014 at 09:43
Hello,
I done implement the part as given by the first example, but still no sound coming out from the audio port. I think I stuck somewhere around the output part there. After reading through the first and second example given, I still a bit confusing in the output part regarding how to switch the buffer. Here are my code for the output part:-
enum
mad_flow output(
void
*data,
struct
mad_header
const
*header,
struct
mad_pcm *pcm)
{
unsigned
int
nchannels, nsamples;
mad_fixed_t
const
*left_ch, *right_ch;
signed sample;
uint16_t *output=wavebuffer_1;
uint16_t *write_buf;
int
i;
nchannels = pcm->channels;
nsamples = pcm->length;
left_ch = pcm->samples[0];
right_ch = pcm->samples[1];
output = wavebuffer_0;
write_buf = output;
while
(nsamples--)
{
sample = scale(*left_ch++);
*output++ = sample;
if
(nchannels == 2) sample = scale(*right_ch++);
*output++=sample;
}
if
(playing==0)
{
BSP_AUDIO_OUT_Play((uint16_t*)&wavebuffer_1, 4*1152);
playing = 1;
}
else
{
BSP_AUDIO_OUT_Play((uint16_t*)&wavebuffer_0, 4*1152);
playing = 0;
}
return
MAD_FLOW_CONTINUE;
}
May I know what is my mistake over here? Thanks a lot. Your kindness is really sincerely appreciated.
Sincerely,
Kwan
