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embedded: add HAVE_HAL_AUDIO_SINK_STEREO_ONLY

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This commit is contained in:
Milanka Ringwald 2022-06-23 15:33:56 +02:00 committed by Matthias Ringwald
parent 2e62f88c7e
commit 329d55f343
2 changed files with 30 additions and 4 deletions
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2
doc/manual/docs-template/how_to.md
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@ -50,6 +50,8 @@ Embedded platform properties:
-----------------------------------|------------------------------------
HAVE_EMBEDDED_TIME_MS | System provides time in milliseconds
HAVE_EMBEDDED_TICK | System provides tick interrupt
HAVE_HAL_AUDIO | Audio HAL is available
HAVE_HAL_AUDIO_SINK_STEREO_ONLY | Duplicate samples for mono playback
FreeRTOS platform properties:

32
platform/embedded/btstack_audio_embedded.c
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@ -71,10 +71,16 @@ static unsigned int output_buffer_samples;
static volatile int input_buffer_ready;
static volatile const int16_t * input_buffer_samples;
static volatile uint16_t input_buffer_num_samples;
static unsigned int output_channels;
static int source_active;
static int sink_active;
// Support for stereo-only audio hal
#ifdef HAVE_HAL_AUDIO_SINK_STEREO_ONLY
static bool output_duplicate_samples;
#endif
static void btstack_audio_audio_played(uint8_t buffer_index){
output_buffer_to_play = (buffer_index + 1) % output_buffer_count;
}
@ -92,6 +98,18 @@ static void driver_timer_handler_sink(btstack_timer_source_t * ts){
int16_t * buffer = hal_audio_sink_get_output_buffer(output_buffer_to_fill);
(*playback_callback)(buffer, output_buffer_samples);
#ifdef HAVE_HAL_AUDIO_SINK_STEREO_ONLY
if (output_duplicate_samples){
unsigned int i = output_buffer_samples;
do {
i--;
int16_t sample = buffer[i];
buffer[2*i + 0] = sample;
buffer[2*i + 1] = sample;
} while ( i > 0 );
}
#endif
// next
output_buffer_to_fill = (output_buffer_to_fill + 1 ) % output_buffer_count;
}
@ -118,10 +136,14 @@ static int btstack_audio_embedded_sink_init(
uint32_t samplerate,
void (*playback)(int16_t * buffer, uint16_t num_samples)
){
if (!playback){
log_error("No playback callback");
return 1;
}
btstack_assert(playback != NULL);
btstack_assert(channels != 0);
#ifdef HAVE_HAL_AUDIO_SINK_STEREO_ONLY
// always use stereo from hal, duplicate samples if needed
output_duplicate_samples = num_channels != 2;
channels = 2;
#endif
playback_callback = playback;
@ -159,6 +181,8 @@ static void btstack_audio_embedded_sink_start_stream(void){
output_buffer_count = hal_audio_sink_get_num_output_buffers();
output_buffer_samples = hal_audio_sink_get_num_output_buffer_samples();
btstack_assert(output_buffer_samples > 0);
// pre-fill HAL buffers
uint16_t i;
for (i=0;i<output_buffer_count;i++){