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btstack_lc3plus_fraunhofer: support stride option for stereo audio

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This commit is contained in:
Matthias Ringwald 2023-07-10 12:13:02 +02:00
parent 021ff6c00b
commit 294f7bb5b2
1 changed files with 23 additions and 6 deletions
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29
test/le_audio/btstack_lc3plus_fraunhofer.c
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@ -44,6 +44,8 @@
#ifdef HAVE_LC3PLUS
#define MAX_SAMPLES_PER_FRAME 480
static uint8_t lc3plus_farunhofer_scratch[LC3PLUS_DEC_MAX_SCRATCH_SIZE];
static uint16_t lc3_frame_duration_in_us(btstack_lc3_frame_duration_t frame_duration){
@ -85,13 +87,20 @@ static uint8_t lc3plus_fraunhofer_decoder_configure(void * context, uint32_t sam
return ERROR_CODE_SUCCESS;
}
static uint8_t lc3plus_fraunhofer_decoder_decode_signed_16(void * context, const uint8_t *bytes, uint8_t BFI, int16_t* pcm_out, uint16_t stride, uint8_t * BEC_detect){
btstack_lc3plus_fraunhofer_decoder_t * instance = (btstack_lc3plus_fraunhofer_decoder_t *) context;
LC3PLUS_Dec * decoder = (LC3PLUS_Dec*) instance->decoder;
static uint8_t lc3plus_fraunhofer_decoder_decode_signed_16(void * context, const uint8_t *bytes, uint8_t BFI, int16_t* pcm_out, uint16_t stride, uint8_t * BEC_detect) {
btstack_lc3plus_fraunhofer_decoder_t *instance = (btstack_lc3plus_fraunhofer_decoder_t *) context;
LC3PLUS_Dec *decoder = (LC3PLUS_Dec *) instance->decoder;
// output_samples: array of channel buffers.
int16_t * output_samples[1];
output_samples[0] = pcm_out;
// temporary output buffer to interleave samples for caller
int16_t temp_out[MAX_SAMPLES_PER_FRAME];
// output_samples: array of channel buffers. use temp_out if stride is used
int16_t *output_samples[1];
if (stride > 1) {
output_samples[0] = temp_out;
} else {
output_samples[0] = pcm_out;
}
// trigger plc if BFI by passing 0 valid input bytes
uint16_t byte_count = instance->octets_per_frame;
@ -101,6 +110,14 @@ static uint8_t lc3plus_fraunhofer_decoder_decode_signed_16(void * context, const
LC3PLUS_Error error = lc3plus_dec16(decoder, (void*) bytes, byte_count, output_samples, lc3plus_farunhofer_scratch, BFI);
// store samples
if (stride > 1){
uint16_t i;
for (i = 0; i < instance->samples_per_frame; i++){
pcm_out [i * stride] = temp_out[i];
}
}
// map error
switch (error){
case LC3PLUS_OK: