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esp32: support mono audio output

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This commit is contained in:
Matthias Ringwald 2021-12-28 16:36:08 +01:00
parent c93c6de44c
commit ec71250290
1 changed files with 11 additions and 6 deletions
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17
port/esp32/components/btstack/btstack_audio_esp32.c
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@ -88,11 +88,9 @@ static bool btstack_audio_esp32_i2s_streaming;
static btstack_timer_source_t btstack_audio_esp32_driver_timer;
static uint8_t btstack_audio_esp32_sink_num_channels;
static uint8_t btstack_audio_esp32_sink_bytes_per_sample;
static uint32_t btstack_audio_esp32_sink_samplerate;
static uint8_t btstack_audio_esp32_source_num_channels;
static uint8_t btstack_audio_esp32_source_bytes_per_sample;
static uint32_t btstack_audio_esp32_source_samplerate;
static btstack_audio_esp32_state_t btstack_audio_esp32_sink_state;
@ -236,7 +234,7 @@ static void btstack_audio_esp32_init(void){
btstack_audio_esp32_set_i2s0_mclk();
#endif
log_info("i2s init mode 0x%2x", i2s_mode);
log_info("i2s init mode 0x%02x, samplerate %u", i2s_mode, btstack_audio_esp32_sink_samplerate);
i2s_driver_install(BTSTACK_AUDIO_I2S_NUM, &config, DMA_BUFFER_COUNT, &btstack_audio_esp32_i2s_event_queue);
i2s_set_pin(BTSTACK_AUDIO_I2S_NUM, &pins);
@ -271,10 +269,19 @@ static void btstack_audio_esp32_sink_fill_buffer(void){
uint8_t buffer[DMA_BUFFER_SAMPLES * BYTES_PER_SAMPLE_STEREO];
if (btstack_audio_esp32_sink_state == BTSTACK_AUDIO_ESP32_STREAMING){
(*btstack_audio_esp32_sink_playback_callback)((int16_t *) buffer, DMA_BUFFER_SAMPLES);
// duplicate samples for mono
if (btstack_audio_esp32_sink_num_channels == 1){
int16_t i;
int16_t * buffer16 = (int16_t *) buffer;
for (i=DMA_BUFFER_SAMPLES-1;i >= 0; i--){
buffer16[2*i ] = buffer16[i];
buffer16[2*i+1] = buffer16[i];
}
}
} else {
memset(buffer, 0, sizeof(buffer));
}
i2s_write(BTSTACK_AUDIO_I2S_NUM, buffer, DMA_BUFFER_SAMPLES * btstack_audio_esp32_sink_bytes_per_sample, &bytes_written, portMAX_DELAY);
i2s_write(BTSTACK_AUDIO_I2S_NUM, buffer, DMA_BUFFER_SAMPLES * BYTES_PER_SAMPLE_STEREO, &bytes_written, portMAX_DELAY);
}
static int btstack_audio_esp32_sink_init(
@ -288,7 +295,6 @@ static int btstack_audio_esp32_sink_init(
// store config
btstack_audio_esp32_sink_playback_callback = playback;
btstack_audio_esp32_sink_num_channels = channels;
btstack_audio_esp32_sink_bytes_per_sample = channels * 2; // 16-bit
btstack_audio_esp32_sink_samplerate = samplerate;
btstack_audio_esp32_sink_state = BTSTACK_AUDIO_ESP32_INITIALIZED;
@ -386,7 +392,6 @@ static int btstack_audio_esp32_source_init(
// store config
btstack_audio_esp32_source_recording_callback = recording;
btstack_audio_esp32_source_num_channels = channels;
btstack_audio_esp32_source_bytes_per_sample = channels * 2; // 16-bit
btstack_audio_esp32_source_samplerate = samplerate;
btstack_audio_esp32_source_state = BTSTACK_AUDIO_ESP32_INITIALIZED;