mirror/btstack
1
0
Fork 0
mirror of https://github.com/bluekitchen/btstack.git synced 2025-03-29 22:20:37 +00:00
Code Issues Packages Projects Releases Wiki Activity

example/sco_demo_util: ENABLE_SCO_STEREO_PLAYBACK uses stereo audio sink

Browse Source
This commit is contained in:
Matthias Ringwald 2019-02-26 18:35:47 +01:00
parent 0bb91267e2
commit f55ac442b0
1 changed files with 36 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
example/sco_demo_util.c
View File

@ -71,6 +71,8 @@
// number of sco packets until 'report' on console
#define SCO_REPORT_PERIOD 100
// #define ENABLE_SCO_STEREO_PLAYBACK
#ifdef HAVE_POSIX_FILE_IO
// length and name of wav file on disk
#define SCO_WAV_DURATION_IN_SECONDS 15
@ -187,8 +189,6 @@ static void sco_demo_msbc_fill_sine_audio_frame(void){
static void playback_callback(int16_t * buffer, uint16_t num_samples){
// config based on codec
int bytes_to_copy = num_samples * BYTES_PER_FRAME;
uint32_t prebuffer_bytes;
switch (negotiated_codec){
case HFP_CODEC_MSBC:
@ -203,8 +203,12 @@ static void playback_callback(int16_t * buffer, uint16_t num_samples){
// fill with silence while paused
if (audio_output_paused){
if (btstack_ring_buffer_bytes_available(&audio_output_ring_buffer) < prebuffer_bytes){
memset(buffer, 0, bytes_to_copy);
return;
#ifdef ENABLE_SCO_STEREO_PLAYBACK
memset(buffer, 0, num_samples * BYTES_PER_FRAME * 2);
#else
memset(buffer, 0, num_samples * BYTES_PER_FRAME);
#endif
return;
} else {
// resume playback
audio_output_paused = 0;
@ -213,12 +217,32 @@ static void playback_callback(int16_t * buffer, uint16_t num_samples){
// get data from ringbuffer
uint32_t bytes_read = 0;
btstack_ring_buffer_read(&audio_output_ring_buffer, (uint8_t *) buffer, bytes_to_copy, &bytes_read);
bytes_to_copy -= bytes_read;
#ifdef ENABLE_SCO_STEREO_PLAYBACK
while (num_samples){
int16_t temp[16];
unsigned int bytes_to_read = btstack_min(num_samples * BYTES_PER_FRAME, sizeof(temp));
btstack_ring_buffer_read(&audio_output_ring_buffer, (uint8_t *) &temp[0], bytes_to_read, &bytes_read);
if (bytes_read == 0) break;
unsigned int i;
for (i=0;i<bytes_read / BYTES_PER_FRAME;i++){
*buffer++ = temp[i];
*buffer++ = temp[i];
num_samples--;
}
}
#else
btstack_ring_buffer_read(&audio_output_ring_buffer, (uint8_t *) buffer, num_samples * BYTES_PER_FRAME, &bytes_read);
num_samples -= bytes_read / BYTES_PER_FRAME;
buffer += bytes_read / BYTES_PER_FRAME;
#endif
// fill with 0 if not enough
if (bytes_to_copy){
memset(buffer + bytes_read, 0, bytes_to_copy);
if (num_samples){
#ifdef ENABLE_SCO_STEREO_PLAYBACK
memset(buffer, 0, num_samples * BYTES_PER_FRAME * 2);
#else
memset(buffer, 0, num_samples * BYTES_PER_FRAME);
#endif
audio_output_paused = 1;
}
}
@ -242,7 +266,11 @@ static int audio_initialize(int sample_rate){
const btstack_audio_sink_t * audio_sink = btstack_audio_sink_get_instance();
if (!audio_sink) return 0;
#ifdef ENABLE_SCO_STEREO_PLAYBACK
audio_sink->init(2, sample_rate, &playback_callback);
#else
audio_sink->init(1, sample_rate, &playback_callback);
#endif
audio_sink->start_stream();
audio_output_paused = 1;