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btstack/example/a2dp_sink_demo.c

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/*
* Copyright (C) 2016 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__ "a2dp_sink_demo.c"
/*
* a2dp_sink_demo.c
*/
// *****************************************************************************
/* EXAMPLE_START(a2dp_sink_demo): Receive audio stream and control its playback.
*
* @text This A2DP Sink example demonstrates how to use the A2DP Sink service to
* receive an audio data stream from a remote A2DP Source device. In addition,
* the AVRCP Controller is used to get information on currently played media,
* such are title, artist and album, as well as to control the playback,
* i.e. to play, stop, repeat, etc.
*
* @test To test with a remote device, e.g. a mobile phone,
* pair from the remote device with the demo, then start playing music on the remote device.
* Alternatively, set the device_addr_string to the Bluetooth address of your
* remote device in the code, and call connect from the UI.
*
* @test To controll the playback, tap SPACE on the console to show the available
* AVRCP commands.
*/
// *****************************************************************************
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
#define AVRCP_BROWSING_ENABLED 0
#ifdef HAVE_BTSTACK_STDIN
#include "btstack_stdin.h"
#endif
#ifdef HAVE_AUDIO_DMA
#include "btstack_ring_buffer.h"
#include "hal_audio_dma.h"
#endif
#ifdef HAVE_PORTAUDIO
#include "btstack_ring_buffer.h"
#include <portaudio.h>
#endif
#ifdef HAVE_POSIX_FILE_IO
#include "wav_util.h"
#define STORE_SBC_TO_SBC_FILE
#define STORE_SBC_TO_WAV_FILE
#endif
#if defined(HAVE_PORTAUDIO) || defined(STORE_SBC_TO_WAV_FILE) || defined(HAVE_AUDIO_DMA)
#define DECODE_SBC
#endif
#define NUM_CHANNELS 2
#define BYTES_PER_FRAME (2*NUM_CHANNELS)
#define MAX_SBC_FRAME_SIZE 120
// SBC Decoder for WAV file or PortAudio
#ifdef DECODE_SBC
static btstack_sbc_decoder_state_t state;
static btstack_sbc_mode_t mode = SBC_MODE_STANDARD;
#endif
#if defined(HAVE_PORTAUDIO) || defined (HAVE_AUDIO_DMA)
#define PREBUFFER_MS 200
static int audio_stream_started = 0;
static int audio_stream_paused = 0;
static btstack_ring_buffer_t ring_buffer;
#endif
#ifdef HAVE_AUDIO_DMA
// below 30: add samples, 30-40: fine, above 40: drop samples
#define OPTIMAL_FRAMES_MIN 30
#define OPTIMAL_FRAMES_MAX 40
#define ADDITIONAL_FRAMES 10
#define DMA_AUDIO_FRAMES 128
#define DMA_MAX_FILL_FRAMES 1
#define NUM_AUDIO_BUFFERS 2
static uint16_t audio_samples[(DMA_AUDIO_FRAMES + DMA_MAX_FILL_FRAMES)*2*NUM_AUDIO_BUFFERS];
static uint16_t audio_samples_len[NUM_AUDIO_BUFFERS];
static uint8_t ring_buffer_storage[(OPTIMAL_FRAMES_MAX + ADDITIONAL_FRAMES) * MAX_SBC_FRAME_SIZE];
static const uint16_t silent_buffer[DMA_AUDIO_FRAMES*2];
static volatile int playback_buffer;
static int write_buffer;
static uint8_t sbc_frame_size;
static int sbc_samples_fix;
#endif
// PortAudio - live playback
#ifdef HAVE_PORTAUDIO
#define PA_SAMPLE_TYPE paInt16
#define SAMPLE_RATE 48000
#define FRAMES_PER_BUFFER 128
#define PREBUFFER_BYTES (PREBUFFER_MS*SAMPLE_RATE/1000*BYTES_PER_FRAME)
static PaStream * stream;
static uint8_t ring_buffer_storage[2*PREBUFFER_BYTES];
#endif
// WAV File
#ifdef STORE_SBC_TO_WAV_FILE
static int frame_count = 0;
static char * wav_filename = "avdtp_sink.wav";
#endif
#ifdef STORE_SBC_TO_SBC_FILE
static FILE * sbc_file;
static char * sbc_filename = "avdtp_sink.sbc";
#endif
typedef struct {
// bitmaps
uint8_t sampling_frequency_bitmap;
uint8_t channel_mode_bitmap;
uint8_t block_length_bitmap;
uint8_t subbands_bitmap;
uint8_t allocation_method_bitmap;
uint8_t min_bitpool_value;
uint8_t max_bitpool_value;
} adtvp_media_codec_information_sbc_t;
typedef struct {
int reconfigure;
int num_channels;
int sampling_frequency;
int channel_mode;
int block_length;
int subbands;
int allocation_method;
int min_bitpool_value;
int max_bitpool_value;
int frames_per_buffer;
} avdtp_media_codec_configuration_sbc_t;
#ifdef HAVE_BTSTACK_STDIN
// mac 2011: static bd_addr_t remote = {0x04, 0x0C, 0xCE, 0xE4, 0x85, 0xD3};
// pts: static bd_addr_t remote = {0x00, 0x1B, 0xDC, 0x08, 0x0A, 0xA5};
// mac 2013:
// mac 2013: static const char * device_addr_string = "84:38:35:65:d1:15";
// iPhone 5S: static const char * device_addr_string = "54:E4:3A:26:A2:39";
// BT dongle:
static const char * device_addr_string = "00:02:72:DC:31:C1";
#endif
// bt dongle: -u 02-02 static bd_addr_t remote = {0x00, 0x02, 0x72, 0xDC, 0x31, 0xC1};
static uint8_t sdp_avdtp_sink_service_buffer[150];
static avdtp_media_codec_configuration_sbc_t sbc_configuration;
static uint16_t a2dp_cid = 0;
static uint8_t local_seid = 0;
static uint8_t value[100];
static btstack_packet_callback_registration_t hci_event_callback_registration;
static int media_initialized = 0;
#ifdef HAVE_BTSTACK_STDIN
static bd_addr_t device_addr;
#endif
static uint16_t a2dp_sink_connected = 0;
static uint16_t avrcp_cid = 0;
static uint8_t avrcp_connected = 0;
static uint8_t sdp_avrcp_controller_service_buffer[200];
static uint8_t media_sbc_codec_capabilities[] = {
0xFF,//(AVDTP_SBC_44100 << 4) | AVDTP_SBC_STEREO,
0xFF,//(AVDTP_SBC_BLOCK_LENGTH_16 << 4) | (AVDTP_SBC_SUBBANDS_8 << 2) | AVDTP_SBC_ALLOCATION_METHOD_LOUDNESS,
2, 53
};
static uint8_t media_sbc_codec_configuration[] = {
(AVDTP_SBC_44100 << 4) | AVDTP_SBC_STEREO,
(AVDTP_SBC_BLOCK_LENGTH_16 << 4) | (AVDTP_SBC_SUBBANDS_8 << 2) | AVDTP_SBC_ALLOCATION_METHOD_LOUDNESS,
2, 53
};
/* @section Main Application Setup
*
* @text The Listing MainConfiguration shows how to setup AD2P Sink and AVRCP controller services.
* To announce A2DP Sink and AVRCP Controller services, you need to create corresponding
* SDP records and register them with the SDP service.
* You'll also need to register several packet handlers:
* - a2dp_sink_packet_handler - handles events on stream connection status (established, released), the media codec configuration, and, the status of the stream itself (opened, paused, stopped).
* - handle_l2cap_media_data_packet - used to receive streaming data. If HAVE_PORTAUDIO or STORE_SBC_TO_WAV_FILE directives (check btstack_config.h) are used, the SBC decoder will be used to decode the SBC data into PCM frames. The resulting PCM frames are then processed in the SBC Decoder callback.
* - stdin_process callback - used to trigger AVRCP commands to the A2DP Source device, such are get now playing info, start, stop, volume control. Requires HAVE_BTSTACK_STDIN.
* - avrcp_controller_packet_handler - used to receive answers for AVRCP commands,
*
* @text Note, currently only the SBC codec is supported.
* If you want to store the audio data in a file, you'll need to define STORE_SBC_TO_WAV_FILE. The HAVE_PORTAUDIO directive indicates if the audio is played back via PortAudio.
* If HAVE_PORTAUDIO or STORE_SBC_TO_WAV_FILE directives is defined, the SBC decoder needs to get initialized when a2dp_sink_packet_handler receives event A2DP_SUBEVENT_STREAM_STARTED.
* The initialization of the SBC decoder requires a callback that handles PCM data:
* - handle_pcm_data - handles PCM audio frames. Here, they are stored a in wav file if STORE_SBC_TO_WAV_FILE is defined, and/or played using the PortAudio library if HAVE_PORTAUDIO is defined.
*/
/* LISTING_START(MainConfiguration): Setup Audio Sink and AVRCP Controller services */
static void a2dp_sink_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t * event, uint16_t event_size);
static void avrcp_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void handle_l2cap_media_data_packet(uint8_t seid, uint8_t *packet, uint16_t size);
#ifdef HAVE_BTSTACK_STDIN
static void stdin_process(char cmd);
#endif
#if defined(HAVE_PORTAUDIO) || defined(STORE_SBC_TO_WAV_FILE)
static void handle_pcm_data(int16_t * data, int num_samples, int num_channels, int sample_rate, void * context);
#endif
static int a2dp_sink_and_avrcp_services_init(void){
// Register for HCI events.
hci_event_callback_registration.callback = &a2dp_sink_packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
// Initialize L2CAP.
l2cap_init();
// Initialize A2DP Sink.
a2dp_sink_init();
// Register A2DP Sink for HCI events.
a2dp_sink_register_packet_handler(&a2dp_sink_packet_handler);
// Register A2DP Sink for receiving media data.
a2dp_sink_register_media_handler(&handle_l2cap_media_data_packet);
// Create a stream endpoint to which the streaming channel will be opened.
uint8_t status = a2dp_sink_create_stream_endpoint(AVDTP_AUDIO, AVDTP_CODEC_SBC, media_sbc_codec_capabilities, sizeof(media_sbc_codec_capabilities), media_sbc_codec_configuration, sizeof(media_sbc_codec_configuration), &local_seid);
if (status != ERROR_CODE_SUCCESS){
printf("A2DP Sink: not enough memory to create local stream endpoint\n");
return 1;
}
// Initialize AVRCP Controller.
avrcp_controller_init();
// Register AVRCP for HCI events.
avrcp_controller_register_packet_handler(&avrcp_controller_packet_handler);
// Initialize SDP.
sdp_init();
// Create A2DP sink service record and register it with SDP.
memset(sdp_avdtp_sink_service_buffer, 0, sizeof(sdp_avdtp_sink_service_buffer));
a2dp_sink_create_sdp_record(sdp_avdtp_sink_service_buffer, 0x10001, 1, NULL, NULL);
sdp_register_service(sdp_avdtp_sink_service_buffer);
// Create AVRCP service record and register it with SDP.
memset(sdp_avrcp_controller_service_buffer, 0, sizeof(sdp_avrcp_controller_service_buffer));
avrcp_controller_create_sdp_record(sdp_avrcp_controller_service_buffer, 0x10001, AVRCP_BROWSING_ENABLED, 1, NULL, NULL);
sdp_register_service(sdp_avrcp_controller_service_buffer);
// Set local name with a template Bluetooth address, that will be automatically
// replaced with a actual address once it is available, i.e. when BTstack boots
// up and starts talking to a Bluetooth module.
gap_set_local_name("A2DP Sink Demo 00:00:00:00:00:00");
gap_discoverable_control(1);
gap_set_class_of_device(0x200408);
#ifdef HAVE_AUDIO_DMA
static btstack_data_source_t hal_audio_dma_data_source;
// Set up polling data source.
btstack_run_loop_set_data_source_handler(&hal_audio_dma_data_source, &hal_audio_dma_process);
btstack_run_loop_enable_data_source_callbacks(&hal_audio_dma_data_source, DATA_SOURCE_CALLBACK_POLL);
btstack_run_loop_add_data_source(&hal_audio_dma_data_source);
#endif
#ifdef HAVE_BTSTACK_STDIN
// Parse human readable Bluetooth address.
sscanf_bd_addr(device_addr_string, device_addr);
btstack_stdin_setup(stdin_process);
#endif
return 0;
}
/* LISTING_END */
#ifdef HAVE_PORTAUDIO
static int portaudio_callback( const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
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 */
// Prevent unused variable warnings.
(void) timeInfo;
(void) statusFlags;
(void) inputBuffer;
(void) userData;
int bytes_to_copy = framesPerBuffer * BYTES_PER_FRAME;
// fill ring buffer with silence while stream is paused
if (audio_stream_paused){
if (btstack_ring_buffer_bytes_available(&ring_buffer) < PREBUFFER_BYTES){
memset(outputBuffer, 0, bytes_to_copy);
return 0;
} else {
// resume playback
audio_stream_paused = 0;
}
}
// get data from ring buffer
uint32_t bytes_read = 0;
btstack_ring_buffer_read(&ring_buffer, outputBuffer, bytes_to_copy, &bytes_read);
bytes_to_copy -= bytes_read;
// fill ring buffer with silence if there are not enough bytes to copy
if (bytes_to_copy){
memset(outputBuffer + bytes_read, 0, bytes_to_copy);
audio_stream_paused = 1;
}
return 0;
}
#endif
#ifdef HAVE_AUDIO_DMA
static int next_buffer(int current){
if (current == NUM_AUDIO_BUFFERS-1) return 0;
return current + 1;
}
static uint8_t * start_of_buffer(int num){
return (uint8_t *) &audio_samples[num * DMA_AUDIO_FRAMES * 2];
}
void hal_audio_dma_done(void){
if (audio_stream_paused){
hal_audio_dma_play((const uint8_t *) silent_buffer, DMA_AUDIO_FRAMES*4);
return;
}
// next buffer
int next_playback_buffer = next_buffer(playback_buffer);
uint8_t * playback_data;
if (next_playback_buffer == write_buffer){
// TODO: stop codec while playing silence when getting 'stream paused'
// start playing silence
audio_stream_paused = 1;
hal_audio_dma_play((const uint8_t *) silent_buffer, DMA_AUDIO_FRAMES*4);
printf("%6u - paused - bytes in buffer %u\n", (int) btstack_run_loop_get_time_ms(), btstack_ring_buffer_bytes_available(&ring_buffer));
return;
}
playback_buffer = next_playback_buffer;
playback_data = start_of_buffer(playback_buffer);
hal_audio_dma_play(playback_data, audio_samples_len[playback_buffer]);
// btstack_run_loop_embedded_trigger();
}
#endif
#ifdef HAVE_AUDIO_DMA
static void hal_audio_dma_process(btstack_data_source_t * ds, btstack_data_source_callback_type_t callback_type){
UNUSED(ds);
UNUSED(callback_type);
if (!media_initialized) return;
int trigger_resume = 0;
if (audio_stream_paused) {
if (sbc_frame_size && btstack_ring_buffer_bytes_available(&ring_buffer) >= OPTIMAL_FRAMES_MIN * sbc_frame_size){
trigger_resume = 1;
// reset buffers
playback_buffer = NUM_AUDIO_BUFFERS - 1;
write_buffer = 0;
} else {
return;
}
}
while (playback_buffer != write_buffer && btstack_ring_buffer_bytes_available(&ring_buffer) >= sbc_frame_size ){
uint8_t frame[MAX_SBC_FRAME_SIZE];
uint32_t bytes_read = 0;
btstack_ring_buffer_read(&ring_buffer, frame, sbc_frame_size, &bytes_read);
btstack_sbc_decoder_process_data(&state, 0, frame, sbc_frame_size);
}
if (trigger_resume){
printf("%6u - resume\n", (int) btstack_run_loop_get_time_ms());
audio_stream_paused = 0;
}
}
#endif
static int media_processing_init(avdtp_media_codec_configuration_sbc_t configuration){
if (media_initialized) return 0;
#ifdef DECODE_SBC
btstack_sbc_decoder_init(&state, mode, handle_pcm_data, NULL);
#endif
#ifdef STORE_SBC_TO_WAV_FILE
wav_writer_open(wav_filename, configuration.num_channels, configuration.sampling_frequency);
#endif
#ifdef STORE_SBC_TO_SBC_FILE
sbc_file = fopen(sbc_filename, "wb");
#endif
#ifdef HAVE_PORTAUDIO
// int frames_per_buffer = configuration.frames_per_buffer;
PaError err;
PaStreamParameters outputParameters;
const PaDeviceInfo *deviceInfo;
/* -- initialize PortAudio -- */
err = Pa_Initialize();
if (err != paNoError){
printf("Error initializing portaudio: \"%s\"\n", Pa_GetErrorText(err));
return err;
}
/* -- setup input and output -- */
outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
outputParameters.channelCount = configuration.num_channels;
outputParameters.sampleFormat = PA_SAMPLE_TYPE;
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency;
outputParameters.hostApiSpecificStreamInfo = NULL;
deviceInfo = Pa_GetDeviceInfo( outputParameters.device );
printf("PortAudio: Output device: %s\n", deviceInfo->name);
log_info("PortAudio: Output device: %s", deviceInfo->name);
/* -- setup stream -- */
err = Pa_OpenStream(
&stream,
NULL, /* &inputParameters */
&outputParameters,
configuration.sampling_frequency,
0,
paClipOff, /* we won't output out of range samples so don't bother clipping them */
portaudio_callback, /* use callback */
NULL );
if (err != paNoError){
printf("Error initializing portaudio: \"%s\"\n", Pa_GetErrorText(err));
return err;
}
log_info("PortAudio: stream opened");
printf("PortAudio: stream opened\n");
#endif
#ifdef HAVE_AUDIO_DMA
audio_stream_paused = 1;
hal_audio_dma_init(configuration.sampling_frequency);
hal_audio_dma_set_audio_played(&hal_audio_dma_done);
// start playing silence
hal_audio_dma_done();
#endif
#if defined(HAVE_PORTAUDIO) || defined (HAVE_AUDIO_DMA)
memset(ring_buffer_storage, 0, sizeof(ring_buffer_storage));
btstack_ring_buffer_init(&ring_buffer, ring_buffer_storage, sizeof(ring_buffer_storage));
audio_stream_started = 0;
audio_stream_paused = 0;
#endif
media_initialized = 1;
return 0;
}
static void media_processing_close(void){
if (!media_initialized) return;
media_initialized = 0;
#ifdef STORE_SBC_TO_WAV_FILE
wav_writer_close();
int total_frames_nr = state.good_frames_nr + state.bad_frames_nr + state.zero_frames_nr;
printf("WAV Writer: Decoding done. Processed totaly %d frames:\n - %d good\n - %d bad\n - %d zero frames\n", total_frames_nr, state.good_frames_nr, state.bad_frames_nr, state.zero_frames_nr);
printf("WAV Writer: Written %d frames to wav file: %s\n", frame_count, wav_filename);
#endif
#ifdef STORE_SBC_TO_SBC_FILE
fclose(sbc_file);
#endif
#if defined(HAVE_PORTAUDIO) || defined (HAVE_AUDIO_DMA)
audio_stream_started = 0;
#endif
#ifdef HAVE_PORTAUDIO
printf("PortAudio: Stream closed\n");
log_info("PortAudio: Stream closed");
PaError err = Pa_StopStream(stream);
if (err != paNoError){
printf("Error stopping the stream: \"%s\"\n", Pa_GetErrorText(err));
log_error("Error stopping the stream: \"%s\"", Pa_GetErrorText(err));
return;
}
err = Pa_CloseStream(stream);
if (err != paNoError){
printf("Error closing the stream: \"%s\"\n", Pa_GetErrorText(err));
log_error("Error closing the stream: \"%s\"", Pa_GetErrorText(err));
return;
}
err = Pa_Terminate();
if (err != paNoError){
printf("Error terminating portaudio: \"%s\"\n", Pa_GetErrorText(err));
log_error("Error terminating portaudio: \"%s\"", Pa_GetErrorText(err));
return;
}
#endif
#ifdef HAVE_AUDIO_DMA
hal_audio_dma_close();
#endif
}
/* @section Handle Media Data Packet
*
* @text Media data packets, in this case the audio data, are received through the handle_l2cap_media_data_packet callback.
* Currently, only the SBC media codec is supported. Hence, the media data consists of the media packet header and the SBC packet.
* The SBC data will be decoded using an SBC decoder if either HAVE_PORTAUDIO or STORE_SBC_TO_WAV_FILE directive is defined.
* The resulting PCM frames can be then captured through a PCM data callback registered during SBC decoder setup, i.e. the
* handle_pcm_data callback.
*/
static int read_media_data_header(uint8_t * packet, int size, int * offset, avdtp_media_packet_header_t * media_header);
static int read_sbc_header(uint8_t * packet, int size, int * offset, avdtp_sbc_codec_header_t * sbc_header);
static void handle_l2cap_media_data_packet(uint8_t seid, uint8_t *packet, uint16_t size){
UNUSED(seid);
int pos = 0;
avdtp_media_packet_header_t media_header;
if (!read_media_data_header(packet, size, &pos, &media_header)) return;
avdtp_sbc_codec_header_t sbc_header;
if (!read_sbc_header(packet, size, &pos, &sbc_header)) return;
#ifdef HAVE_AUDIO_DMA
// store sbc frame size for buffer management
sbc_frame_size = (size-pos)/ sbc_header.num_frames;
#endif
#if defined(HAVE_PORTAUDIO) || defined(STORE_SBC_TO_WAV_FILE)
btstack_sbc_decoder_process_data(&state, 0, packet+pos, size-pos);
#endif
#ifdef HAVE_AUDIO_DMA
btstack_ring_buffer_write(&ring_buffer, packet+pos, size-pos);
// decide on audio sync drift based on number of sbc frames in queue
int sbc_frames_in_buffer = btstack_ring_buffer_bytes_available(&ring_buffer) / sbc_frame_size;
if (sbc_frames_in_buffer < OPTIMAL_FRAMES_MIN){
sbc_samples_fix = 1; // duplicate last sample
} else if (sbc_frames_in_buffer <= OPTIMAL_FRAMES_MAX){
sbc_samples_fix = 0; // nothing to do
} else {
sbc_samples_fix = -1; // drop last sample
}
// dump
printf("%6u %03u %d\n", (int) btstack_run_loop_get_time_ms(), sbc_frames_in_buffer, sbc_samples_fix);
#endif
#ifdef STORE_SBC_TO_SBC_FILE
fwrite(packet+pos, size-pos, 1, sbc_file);
#endif
}
/* @section Handle PCM Data
*
* @text In this example, we use the [PortAudio library](http://www.portaudio.com) to play the audio stream.
* The PCM data are bufferd in a ring buffer.
* Aditionally, tha audio data can be stored in the avdtp_sink.wav file.
*/
#if defined(HAVE_PORTAUDIO) || defined(STORE_SBC_TO_WAV_FILE) || defined(HAVE_AUDIO_DMA)
static void handle_pcm_data(int16_t * data, int num_samples, int num_channels, int sample_rate, void * context){
UNUSED(sample_rate);
UNUSED(context);
#ifdef STORE_SBC_TO_WAV_FILE
wav_writer_write_int16(num_samples*num_channels, data);
frame_count++;
#endif
#ifdef HAVE_PORTAUDIO
// store pcm samples in ring buffer
btstack_ring_buffer_write(&ring_buffer, (uint8_t *)data, num_samples*num_channels*2);
if (!audio_stream_started){
audio_stream_paused = 1;
/* -- start stream -- */
PaError err = Pa_StartStream(stream);
if (err != paNoError){
printf("Error starting the stream: \"%s\"\n", Pa_GetErrorText(err));
return;
}
audio_stream_started = 1;
}
#endif
#ifdef HAVE_AUDIO_DMA
// store in ring buffer
uint8_t * write_data = start_of_buffer(write_buffer);
uint16_t len = num_samples*num_channels*2;
memcpy(write_data, data, len);
audio_samples_len[write_buffer] = len;
// add/drop audio frame to fix drift
if (sbc_samples_fix > 0){
memcpy(write_data + len, write_data + len - 4, 4);
audio_samples_len[write_buffer] += 4;
}
if (sbc_samples_fix < 0){
audio_samples_len[write_buffer] -= 4;
}
write_buffer = next_buffer(write_buffer);
#endif
}
#endif
static int read_sbc_header(uint8_t * packet, int size, int * offset, avdtp_sbc_codec_header_t * sbc_header){
int sbc_header_len = 12; // without crc
int pos = *offset;
if (size - pos < sbc_header_len){
printf("Not enough data to read SBC header, expected %d, received %d\n", sbc_header_len, size-pos);
return 0;
}
sbc_header->fragmentation = get_bit16(packet[pos], 7);
sbc_header->starting_packet = get_bit16(packet[pos], 6);
sbc_header->last_packet = get_bit16(packet[pos], 5);
sbc_header->num_frames = packet[pos] & 0x0f;
pos++;
// printf("SBC HEADER: num_frames %u, fragmented %u, start %u, stop %u\n", sbc_header.num_frames, sbc_header.fragmentation, sbc_header.starting_packet, sbc_header.last_packet);
*offset = pos;
return 1;
}
static int read_media_data_header(uint8_t *packet, int size, int *offset, avdtp_media_packet_header_t *media_header){
int media_header_len = 12; // without crc
int pos = *offset;
if (size - pos < media_header_len){
printf("Not enough data to read media packet header, expected %d, received %d\n", media_header_len, size-pos);
return 0;
}
media_header->version = packet[pos] & 0x03;
media_header->padding = get_bit16(packet[pos],2);
media_header->extension = get_bit16(packet[pos],3);
media_header->csrc_count = (packet[pos] >> 4) & 0x0F;
pos++;
media_header->marker = get_bit16(packet[pos],0);
media_header->payload_type = (packet[pos] >> 1) & 0x7F;
pos++;
media_header->sequence_number = big_endian_read_16(packet, pos);
pos+=2;
media_header->timestamp = big_endian_read_32(packet, pos);
pos+=4;
media_header->synchronization_source = big_endian_read_32(packet, pos);
pos+=4;
*offset = pos;
// TODO: read csrc list
// printf_hexdump( packet, pos );
// printf("MEDIA HEADER: %u timestamp, version %u, padding %u, extension %u, csrc_count %u\n",
// media_header->timestamp, media_header->version, media_header->padding, media_header->extension, media_header->csrc_count);
// printf("MEDIA HEADER: marker %02x, payload_type %02x, sequence_number %u, synchronization_source %u\n",
// media_header->marker, media_header->payload_type, media_header->sequence_number, media_header->synchronization_source);
return 1;
}
static void dump_sbc_configuration(avdtp_media_codec_configuration_sbc_t configuration){
printf("Received SBC configuration:\n");
printf(" - num_channels: %d\n", configuration.num_channels);
printf(" - sampling_frequency: %d\n", configuration.sampling_frequency);
printf(" - channel_mode: %d\n", configuration.channel_mode);
printf(" - block_length: %d\n", configuration.block_length);
printf(" - subbands: %d\n", configuration.subbands);
printf(" - allocation_method: %d\n", configuration.allocation_method);
printf(" - bitpool_value [%d, %d] \n", configuration.min_bitpool_value, configuration.max_bitpool_value);
printf("\n");
}
static void avrcp_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
uint16_t local_cid;
uint8_t status = 0xFF;
bd_addr_t adress;
if (packet_type != HCI_EVENT_PACKET) return;
if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return;
switch (packet[2]){
case AVRCP_SUBEVENT_CONNECTION_ESTABLISHED: {
local_cid = avrcp_subevent_connection_established_get_avrcp_cid(packet);
if (avrcp_cid != 0 && avrcp_cid != local_cid) {
printf("AVRCP demo: Connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", avrcp_cid, local_cid);
return;
}
status = avrcp_subevent_connection_established_get_status(packet);
if (status != ERROR_CODE_SUCCESS){
printf("AVRCP demo: Connection failed: status 0x%02x\n", status);
avrcp_cid = 0;
return;
}
avrcp_cid = local_cid;
avrcp_connected = 1;
avrcp_subevent_connection_established_get_bd_addr(packet, adress);
printf("AVRCP demo: Channel successfully opened: %s, avrcp_cid 0x%02x\n", bd_addr_to_str(adress), avrcp_cid);
// automatically enable notifications
avrcp_controller_enable_notification(avrcp_cid, AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED);
avrcp_controller_enable_notification(avrcp_cid, AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED);
avrcp_controller_enable_notification(avrcp_cid, AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED);
avrcp_controller_enable_notification(avrcp_cid, AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED);
return;
}
case AVRCP_SUBEVENT_CONNECTION_RELEASED:
printf("AVRCP demo: Channel released: avrcp_cid 0x%02x\n", avrcp_subevent_connection_released_get_avrcp_cid(packet));
avrcp_cid = 0;
avrcp_connected = 0;
return;
default:
break;
}
status = packet[5];
if (!avrcp_cid) return;
// ignore INTERIM status
if (status == AVRCP_CTYPE_RESPONSE_INTERIM) return;
printf("AVRCP demo: command status: %s, ", avrcp_ctype2str(status));
switch (packet[2]){
case AVRCP_SUBEVENT_NOTIFICATION_PLAYBACK_STATUS_CHANGED:
printf("notification, playback status changed %s\n", avrcp_play_status2str(avrcp_subevent_notification_playback_status_changed_get_play_status(packet)));
return;
case AVRCP_SUBEVENT_NOTIFICATION_NOW_PLAYING_CONTENT_CHANGED:
printf("notification, playing content changed\n");
return;
case AVRCP_SUBEVENT_NOTIFICATION_TRACK_CHANGED:
printf("notification track changed\n");
return;
case AVRCP_SUBEVENT_NOTIFICATION_VOLUME_CHANGED:
printf("notification absolute volume changed %d\n", avrcp_subevent_notification_volume_changed_get_absolute_volume(packet));
return;
case AVRCP_SUBEVENT_NOTIFICATION_AVAILABLE_PLAYERS_CHANGED:
printf("notification changed\n");
return;
case AVRCP_SUBEVENT_SHUFFLE_AND_REPEAT_MODE:{
uint8_t shuffle_mode = avrcp_subevent_shuffle_and_repeat_mode_get_shuffle_mode(packet);
uint8_t repeat_mode = avrcp_subevent_shuffle_and_repeat_mode_get_repeat_mode(packet);
printf("%s, %s\n", avrcp_shuffle2str(shuffle_mode), avrcp_repeat2str(repeat_mode));
break;
}
case AVRCP_SUBEVENT_NOW_PLAYING_TITLE_INFO:
if (avrcp_subevent_now_playing_title_info_get_value_len(packet) > 0){
memcpy(value, avrcp_subevent_now_playing_title_info_get_value(packet), avrcp_subevent_now_playing_title_info_get_value_len(packet));
printf(" Title: %s\n", value);
}
break;
case AVRCP_SUBEVENT_NOW_PLAYING_ARTIST_INFO:
if (avrcp_subevent_now_playing_artist_info_get_value_len(packet) > 0){
memcpy(value, avrcp_subevent_now_playing_artist_info_get_value(packet), avrcp_subevent_now_playing_artist_info_get_value_len(packet));
printf(" Artist: %s\n", value);
}
break;
case AVRCP_SUBEVENT_NOW_PLAYING_ALBUM_INFO:
if (avrcp_subevent_now_playing_album_info_get_value_len(packet) > 0){
memcpy(value, avrcp_subevent_now_playing_album_info_get_value(packet), avrcp_subevent_now_playing_album_info_get_value_len(packet));
printf(" Album: %s\n", value);
}
break;
case AVRCP_SUBEVENT_NOW_PLAYING_GENRE_INFO:
if (avrcp_subevent_now_playing_genre_info_get_value_len(packet) > 0){
memcpy(value, avrcp_subevent_now_playing_genre_info_get_value(packet), avrcp_subevent_now_playing_genre_info_get_value_len(packet));
printf(" Genre: %s\n", value);
}
break;
case AVRCP_SUBEVENT_PLAY_STATUS:
printf("song length: %d ms, song position: %d ms, play status: %s\n",
avrcp_subevent_play_status_get_song_length(packet),
avrcp_subevent_play_status_get_song_position(packet),
avrcp_play_status2str(avrcp_subevent_play_status_get_play_status(packet)));
break;
case AVRCP_SUBEVENT_OPERATION_COMPLETE:
printf("operation done %s\n", avrcp_operation2str(avrcp_subevent_operation_complete_get_operation_id(packet)));
break;
case AVRCP_SUBEVENT_OPERATION_START:
printf("operation start %s\n", avrcp_operation2str(avrcp_subevent_operation_complete_get_operation_id(packet)));
break;
case AVRCP_SUBEVENT_PLAYER_APPLICATION_VALUE_RESPONSE:
// response to set shuffle and repeat mode
printf("\n");
break;
default:
printf("AVRCP demo: event is not parsed\n");
break;
}
}
static void a2dp_sink_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
uint16_t cid;
bd_addr_t address;
uint8_t status;
if (packet_type != HCI_EVENT_PACKET) return;
if (hci_event_packet_get_type(packet) == HCI_EVENT_PIN_CODE_REQUEST) {
printf("Pin code request - using '0000'\n");
hci_event_pin_code_request_get_bd_addr(packet, address);
gap_pin_code_response(address, "0000");
return;
}
if (hci_event_packet_get_type(packet) != HCI_EVENT_A2DP_META) return;
switch (packet[2]){
case A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION:
printf("A2DP Sink demo: received non SBC codec. not implemented.\n");
break;
case A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{
printf("A2DP Sink demo: received SBC codec configuration.\n");
sbc_configuration.reconfigure = a2dp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet);
sbc_configuration.num_channels = a2dp_subevent_signaling_media_codec_sbc_configuration_get_num_channels(packet);
sbc_configuration.sampling_frequency = a2dp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet);
sbc_configuration.channel_mode = a2dp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet);
sbc_configuration.block_length = a2dp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet);
sbc_configuration.subbands = a2dp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet);
sbc_configuration.allocation_method = a2dp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet);
sbc_configuration.min_bitpool_value = a2dp_subevent_signaling_media_codec_sbc_configuration_get_min_bitpool_value(packet);
sbc_configuration.max_bitpool_value = a2dp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet);
sbc_configuration.frames_per_buffer = sbc_configuration.subbands * sbc_configuration.block_length;
dump_sbc_configuration(sbc_configuration);
if (sbc_configuration.reconfigure){
media_processing_close();
}
// prepare media processing
media_processing_init(sbc_configuration);
break;
}
case A2DP_SUBEVENT_STREAM_ESTABLISHED:
a2dp_subevent_stream_established_get_bd_addr(packet, address);
status = a2dp_subevent_stream_established_get_status(packet);
cid = a2dp_subevent_stream_established_get_a2dp_cid(packet);
printf("A2DP_SUBEVENT_STREAM_ESTABLISHED %d, %d \n", cid, a2dp_cid);
if (!a2dp_cid){
// incoming connection
a2dp_cid = cid;
} else if (cid != a2dp_cid) {
break;
}
if (status){
a2dp_sink_connected = 0;
printf("A2DP Sink demo: streaming connection failed, status 0x%02x\n", status);
break;
}
printf("A2DP Sink demo: streaming connection is established, address %s, a2dp cid 0x%02X, local_seid %d\n", bd_addr_to_str(address), a2dp_cid, local_seid);
memcpy(device_addr, address, 6);
local_seid = a2dp_subevent_stream_established_get_local_seid(packet);
a2dp_sink_connected = 1;
break;
case A2DP_SUBEVENT_STREAM_STARTED:
cid = a2dp_subevent_stream_started_get_a2dp_cid(packet);
if (cid != a2dp_cid) break;
local_seid = a2dp_subevent_stream_started_get_local_seid(packet);
printf("A2DP Sink demo: stream started, a2dp cid 0x%02X, local_seid %d\n", a2dp_cid, local_seid);
// started
media_processing_init(sbc_configuration);
break;
case A2DP_SUBEVENT_STREAM_SUSPENDED:
cid = a2dp_subevent_stream_suspended_get_a2dp_cid(packet);
if (cid != a2dp_cid) break;
local_seid = a2dp_subevent_stream_suspended_get_local_seid(packet);
printf("A2DP Sink demo: stream paused, a2dp cid 0x%02X, local_seid %d\n", a2dp_cid, local_seid);
media_processing_close();
break;
case A2DP_SUBEVENT_STREAM_RELEASED:
cid = a2dp_subevent_stream_released_get_a2dp_cid(packet);
if (cid != a2dp_cid) {
printf("A2DP Sink demo: unexpected cid 0x%02x instead of 0x%02x\n", cid, a2dp_cid);
break;
}
local_seid = a2dp_subevent_stream_released_get_local_seid(packet);
printf("A2DP Sink demo: stream released, a2dp cid 0x%02X, local_seid %d\n", a2dp_cid, local_seid);
media_processing_close();
break;
case A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:
cid = a2dp_subevent_signaling_connection_released_get_a2dp_cid(packet);
if (cid != a2dp_cid) {
printf("A2DP Sink demo: unexpected cid 0x%02x instead of 0x%02x\n", cid, a2dp_cid);
break;
}
a2dp_sink_connected = 0;
printf("A2DP Sink demo: signaling connection released\n");
break;
default:
printf("A2DP Sink demo: not parsed 0x%02x\n", packet[2]);
break;
}
}
#ifdef HAVE_BTSTACK_STDIN
static void show_usage(void){
bd_addr_t iut_address;
gap_local_bd_addr(iut_address);
printf("\n--- Bluetooth AVDTP Sink/AVRCP Connection Test Console %s ---\n", bd_addr_to_str(iut_address));
printf("b - AVDTP Sink create connection to addr %s\n", bd_addr_to_str(device_addr));
printf("B - AVDTP Sink disconnect\n");
printf("c - AVRCP create connection to addr %s\n", bd_addr_to_str(device_addr));
printf("C - AVRCP disconnect\n");
printf("\n--- Bluetooth AVRCP Commands %s ---\n", bd_addr_to_str(iut_address));
printf("O - get play status\n");
printf("j - get now playing info\n");
printf("k - play\n");
printf("K - stop\n");
printf("L - pause\n");
printf("u - start fast forward\n");
printf("U - stop fast forward\n");
printf("n - start rewind\n");
printf("N - stop rewind\n");
printf("i - forward\n");
printf("I - backward\n");
printf("t - volume up\n");
printf("T - volume down\n");
printf("p - absolute volume of 50 percent\n");
printf("M - mute\n");
printf("r - skip\n");
printf("q - query repeat and shuffle mode\n");
printf("v - repeat single track\n");
printf("x - repeat all tracks\n");
printf("X - disable repeat mode\n");
printf("z - shuffle all tracks\n");
printf("Z - disable shuffle mode\n");
printf("---\n");
}
#endif
#ifdef HAVE_BTSTACK_STDIN
static void stdin_process(char cmd){
uint8_t status = ERROR_CODE_SUCCESS;
printf("stdin_process \n");
if (!avrcp_connected){
switch (cmd){
case 'b':
case 'B':
case 'c':
break;
default:
printf("Command '%c' cannot be performed - please use 'c' to establish an AVRCP connection with device (addr %s).\n", cmd, bd_addr_to_str(device_addr));
return;
}
}
switch (cmd){
case 'b':
status = a2dp_sink_establish_stream(device_addr, local_seid, &a2dp_cid);
printf(" - Create AVDTP connection to addr %s, and local seid %d, expected cid 0x%02x.\n", bd_addr_to_str(device_addr), local_seid, a2dp_cid);
break;
case 'B':
printf(" - AVDTP disconnect from addr %s.\n", bd_addr_to_str(device_addr));
status = avdtp_sink_disconnect(a2dp_cid);
break;
case 'c':
printf(" - Create AVRCP connection to addr %s.\n", bd_addr_to_str(device_addr));
status = avrcp_controller_connect(device_addr, &avrcp_cid);
break;
case 'C':
printf(" - AVRCP disconnect from addr %s.\n", bd_addr_to_str(device_addr));
status = avrcp_controller_disconnect(avrcp_cid);
break;
case '\n':
case '\r':
break;
case 'O':
printf(" - get play status\n");
status = avrcp_controller_get_play_status(avrcp_cid);
break;
case 'j':
printf(" - get now playing info\n");
status = avrcp_controller_get_now_playing_info(avrcp_cid);
break;
case 'k':
printf(" - play\n");
status = avrcp_controller_play(avrcp_cid);
break;
case 'K':
printf(" - stop\n");
status = avrcp_controller_stop(avrcp_cid);
break;
case 'L':
printf(" - pause\n");
status = avrcp_controller_pause(avrcp_cid);
break;
case 'u':
printf(" - start fast forward\n");
status = avrcp_controller_start_fast_forward(avrcp_cid);
break;
case 'U':
printf(" - stop fast forward\n");
status = avrcp_controller_stop_fast_forward(avrcp_cid);
break;
case 'n':
printf(" - start rewind\n");
status = avrcp_controller_start_rewind(avrcp_cid);
break;
case 'N':
printf(" - stop rewind\n");
status = avrcp_controller_stop_rewind(avrcp_cid);
break;
case 'i':
printf(" - forward\n");
status = avrcp_controller_forward(avrcp_cid);
break;
case 'I':
printf(" - backward\n");
status = avrcp_controller_backward(avrcp_cid);
break;
case 't':
printf(" - volume up\n");
status = avrcp_controller_volume_up(avrcp_cid);
break;
case 'T':
printf(" - volume down\n");
status = avrcp_controller_volume_down(avrcp_cid);
break;
case 'p':
printf(" - absolute volume of 50 percent\n");
status = avrcp_controller_set_absolute_volume(avrcp_cid, 50);
break;
case 'M':
printf(" - mute\n");
status = avrcp_controller_mute(avrcp_cid);
break;
case 'r':
printf(" - skip\n");
status = avrcp_controller_skip(avrcp_cid);
break;
case 'q':
printf(" - query repeat and shuffle mode\n");
status = avrcp_controller_query_shuffle_and_repeat_modes(avrcp_cid);
break;
case 'v':
printf(" - repeat single track\n");
status = avrcp_controller_set_repeat_mode(avrcp_cid, AVRCP_REPEAT_MODE_SINGLE_TRACK);
break;
case 'x':
printf(" - repeat all tracks\n");
status = avrcp_controller_set_repeat_mode(avrcp_cid, AVRCP_REPEAT_MODE_ALL_TRACKS);
break;
case 'X':
printf(" - disable repeat mode\n");
status = avrcp_controller_set_repeat_mode(avrcp_cid, AVRCP_REPEAT_MODE_OFF);
break;
case 'z':
printf(" - shuffle all tracks\n");
status = avrcp_controller_set_shuffle_mode(avrcp_cid, AVRCP_SHUFFLE_MODE_ALL_TRACKS);
break;
case 'Z':
printf(" - disable shuffle mode\n");
status = avrcp_controller_set_shuffle_mode(avrcp_cid, AVRCP_SHUFFLE_MODE_OFF);
break;
default:
show_usage();
return;
}
if (status != ERROR_CODE_SUCCESS){
printf("Could not perform command, status 0x%2x\n", status);
}
}
#endif
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
(void)argc;
(void)argv;
int err = a2dp_sink_and_avrcp_services_init();
if (err) return err;
// turn on!
printf("Starting BTstack ...\n");
hci_power_control(HCI_POWER_ON);
return 0;
}
/* EXAMPLE_END */
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