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btstack_audio: implementation for PortAudio

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Matthias Ringwald 2018-07-20 16:08:42 +02:00
parent 23a1bbc334
commit a89df2dffc
1 changed files with 282 additions and 0 deletions
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platform/posix/btstack_audio_portaudio.c Normal file
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/*
* Copyright (C) 2017 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define __BTSTACK_FILE__ "btstack_audio_portaudio.c"
#include <stdint.h>
#include <string.h>
#include "btstack_debug.h"
#include "btstack_audio.h"
#include "btstack_run_loop.h"
#ifdef HAVE_PORTAUDIO
#define PA_SAMPLE_TYPE paInt16
#define NUM_FRAMES_PER_PA_BUFFER 512
#define NUM_OUTPUT_BUFFERS 3
#define NUM_INPUT_BUFFERS 2
#define DRIVER_POLL_INTERVAL_MS 5
#include <portaudio.h>
// config
static int num_channels;
static int num_bytes_per_sample;
// portaudio
static PaStream * stream;
// client
static void (*playback_callback)(int16_t * buffer, uint16_t num_samples);
static void (*recording_callback)(const int16_t * buffer, uint16_t num_samples);
// output buffer
static int16_t output_buffer_a[NUM_FRAMES_PER_PA_BUFFER * 2]; // stereo
static int16_t output_buffer_b[NUM_FRAMES_PER_PA_BUFFER * 2]; // stereo
static int16_t output_buffer_c[NUM_FRAMES_PER_PA_BUFFER * 2]; // stereo
static int16_t * output_buffers[NUM_OUTPUT_BUFFERS] = { output_buffer_a, output_buffer_b, output_buffer_c};
static int output_buffer_to_play;
static int output_buffer_to_fill;
// input buffer
static int16_t input_buffer_a[NUM_FRAMES_PER_PA_BUFFER * 2]; // stereo
static int16_t input_buffer_b[NUM_FRAMES_PER_PA_BUFFER * 2]; // stereo
static int16_t * input_buffers[NUM_INPUT_BUFFERS] = { input_buffer_a, input_buffer_b};
static int input_buffer_to_record;
static int input_buffer_to_fill;
// timer to fill output ring buffer
static btstack_timer_source_t driver_timer;
static int portaudio_callback( const void * inputBuffer,
void * outputBuffer,
unsigned long samples_per_buffer,
const PaStreamCallbackTimeInfo * timeInfo,
PaStreamCallbackFlags statusFlags,
void * userData ) {
/** portaudio_callback is called from different thread, don't use hci_dump / log_info here without additional checks */
(void) timeInfo; /* Prevent unused variable warnings. */
(void) statusFlags;
(void) userData;
(void) samples_per_buffer;
// -- playback / output
if (playback_callback){
// fill from one of our buffers
memcpy(outputBuffer, output_buffers[output_buffer_to_play], NUM_FRAMES_PER_PA_BUFFER * num_bytes_per_sample);
// next
output_buffer_to_play = (output_buffer_to_play + 1 ) % NUM_OUTPUT_BUFFERS;
}
// -- recording / input
if (recording_callback){
// store in one of our buffers
memcpy(input_buffers[input_buffer_to_fill], inputBuffer, NUM_FRAMES_PER_PA_BUFFER * num_bytes_per_sample);
// next
input_buffer_to_fill = (input_buffer_to_fill + 1 ) % NUM_INPUT_BUFFERS;
}
return 0;
}
static void driver_timer_handler(btstack_timer_source_t * ts){
// playback buffer ready to fill
if (playback_callback && output_buffer_to_play != output_buffer_to_fill){
(*playback_callback)(output_buffers[output_buffer_to_fill], NUM_FRAMES_PER_PA_BUFFER);
// next
output_buffer_to_fill = (output_buffer_to_fill + 1 ) % NUM_OUTPUT_BUFFERS;
}
// recording buffer ready to process
if (recording_callback && input_buffer_to_record != input_buffer_to_fill){
(*recording_callback)(input_buffers[input_buffer_to_record], NUM_FRAMES_PER_PA_BUFFER);
// next
input_buffer_to_record = (input_buffer_to_record + 1 ) % NUM_INPUT_BUFFERS;
}
// re-set timer
btstack_run_loop_set_timer(ts, DRIVER_POLL_INTERVAL_MS);
btstack_run_loop_add_timer(ts);
}
static int btstack_audio_portaudio_init(
uint8_t channels,
uint32_t samplerate,
void (*playback)(int16_t * buffer, uint16_t num_samples),
void (*recording)(const int16_t * buffer, uint16_t num_samples)
){
num_channels = channels;
num_bytes_per_sample = 2 * channels;
/* -- initialize PortAudio -- */
PaError err = Pa_Initialize();
if (err != paNoError){
log_error("Error initializing portaudio: \"%s\"\n", Pa_GetErrorText(err));
return err;
}
PaStreamParameters theInputParameters;
PaStreamParameters theOutputParameters;
PaStreamParameters * inputParameters = NULL;
PaStreamParameters * outputParameters = NULL;
/* -- setup output -- */
if (playback){
theOutputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
theOutputParameters.channelCount = channels;
theOutputParameters.sampleFormat = PA_SAMPLE_TYPE;
theOutputParameters.suggestedLatency = Pa_GetDeviceInfo( theOutputParameters.device )->defaultHighOutputLatency;
theOutputParameters.hostApiSpecificStreamInfo = NULL;
const PaDeviceInfo *outputDeviceInfo;
outputDeviceInfo = Pa_GetDeviceInfo( theOutputParameters.device );
log_info("PortAudio: Output device: %s", outputDeviceInfo->name);
outputParameters = &theOutputParameters;
}
/* -- setup input -- */
if (recording){
theInputParameters.device = Pa_GetDefaultInputDevice(); /* default input device */
theInputParameters.channelCount = channels;
theInputParameters.sampleFormat = PA_SAMPLE_TYPE;
theInputParameters.suggestedLatency = Pa_GetDeviceInfo( theInputParameters.device )->defaultHighInputLatency;
theInputParameters.hostApiSpecificStreamInfo = NULL;
const PaDeviceInfo *inputDeviceInfo;
inputDeviceInfo = Pa_GetDeviceInfo( theInputParameters.device );
log_info("PortAudio: Input device: %s", inputDeviceInfo->name);
inputParameters = &theInputParameters;
}
/* -- setup stream -- */
err = Pa_OpenStream(
&stream,
inputParameters,
outputParameters,
samplerate,
NUM_FRAMES_PER_PA_BUFFER,
paClipOff, /* we won't output out of range samples so don't bother clipping them */
portaudio_callback, /* use callback */
NULL );
if (err != paNoError){
log_error("Error initializing portaudio: \"%s\"\n", Pa_GetErrorText(err));
return err;
}
log_info("PortAudio: stream opened");
const PaStreamInfo * stream_info = Pa_GetStreamInfo(stream);
log_info("PortAudio: Input latency: %f", stream_info->inputLatency);
log_info("PortAudio: Output latency: %f", stream_info->outputLatency);
playback_callback = playback;
recording_callback = recording;
return 0;
}
static void btstack_audio_portaudio_start_stream(void){
// fill buffer once
(*playback_callback)(output_buffer_a, NUM_FRAMES_PER_PA_BUFFER);
(*playback_callback)(output_buffer_b, NUM_FRAMES_PER_PA_BUFFER);
output_buffer_to_play = 0;
output_buffer_to_fill = 2;
/* -- start stream -- */
PaError err = Pa_StartStream(stream);
if (err != paNoError){
log_error("Error starting the stream: \"%s\"\n", Pa_GetErrorText(err));
return;
}
// start timer
btstack_run_loop_set_timer_handler(&driver_timer, &driver_timer_handler);
btstack_run_loop_set_timer(&driver_timer, DRIVER_POLL_INTERVAL_MS);
btstack_run_loop_add_timer(&driver_timer);
}
static void btstack_audio_portaudio_close(void){
// stop timer
btstack_run_loop_remove_timer(&driver_timer);
log_info("PortAudio: Stream closed");
PaError err = Pa_StopStream(stream);
if (err != paNoError){
log_error("Error stopping the stream: \"%s\"", Pa_GetErrorText(err));
return;
}
err = Pa_CloseStream(stream);
if (err != paNoError){
log_error("Error closing the stream: \"%s\"", Pa_GetErrorText(err));
return;
}
err = Pa_Terminate();
if (err != paNoError){
log_error("Error terminating portaudio: \"%s\"", Pa_GetErrorText(err));
return;
}
}
static const btstack_audio_t btstack_audio_portaudio = {
/* int (*init)(..);*/ &btstack_audio_portaudio_init,
/* void (*start_stream(void));*/ &btstack_audio_portaudio_start_stream,
/* void (*close)(void); */ &btstack_audio_portaudio_close
};
const btstack_audio_t * btstack_audio_portaudio_get_instance(void){
return &btstack_audio_portaudio;
}
#endif