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a2dp-alsa.c
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a2dp-alsa.c
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/****************************************
* a2dp-alsa.c
* Enable A2DP sink and source on ALSA devices using bluez DBus API.
* In short - it enables remote devices to send sound to the computer (sink)
* and enables the computer (source) to send sound to bluetooth speakers.
*
* For bluez 4.x.
*
* Copyright (C) James Budiono 2013
* License: GNU GPL Version 3 or later
* Version 1: June 2013
****************************************/
// std includes
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <pthread.h>
#include <fcntl.h>
#include <dbus/dbus.h>
#include <errno.h>
#include <arpa/inet.h>
#include <getopt.h>
#include <poll.h>
#include "uthash.h"
// our own defines
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
//#define DEBUG
#ifdef DEBUG
#define debug_print(...) (fprintf (stderr, __VA_ARGS__))
#else
#define debug_print(...)
#endif
// bluez specific defines & includes
#define FIND_ADAPTER "FindAdapter"
#define DEFAULT_ADAPTER "DefaultAdapter"
#define ACCESS_TYPE "rw"
// sink and source uuid and endpoints
#define A2DP_SINK_UUID "0000110b-0000-1000-8000-00805f9b34fb"
#define A2DP_SINK_ENDPOINT "/MediaEndpoint/A2DPSink" // bt --> alsa (sink for bt)
#define A2DP_SOURCE_UUID "0000110a-0000-1000-8000-00805f9b34fb"
#define A2DP_SOURCE_ENDPOINT "/MediaEndpoint/A2DPSource" // alsa --> bt (source for bt)
#include "a2dp-codecs.h" // from bluez - some sbc constants
#include "ipc.h" // from bluez - some sbc constants
#include "rtp.h" // from bluez - packet headers
// sbc stuff
#include "sbc/sbc.h"
// structs and prototypes
typedef struct {
// sync and command management
pthread_cond_t cond;
pthread_mutex_t mutex;
pthread_t t_handle; //thread handle
volatile enum {
IO_CMD_IDLE = 0,
IO_CMD_RUNNING,
IO_CMD_TERMINATE
} command;
enum {
STATE_DISCONNECTED = 0,
STATE_CONNECTED,
STATE_PLAYING
} prev_state;
// transport_path - required to get fd and mtus
char *transport_path; // also the hash key
char *dev_path; // so that audiosource/sink event can find us
// the actual fd and mtus for streaming
int fd, read_mtu, write_mtu;
int write; //false = read, true - write
// codec stuff
a2dp_sbc_t cap;
sbc_t sbc;
// persistent stuff for encoding purpose
uint16_t seq_num; //cumulative packet number
uint32_t timestamp; //timestamp
//hashtable management
UT_hash_handle hh;
} io_thread_tcb_s; //the I/O thread control block.
void *io_thread_run(void *ptr);
void io_thread_set_command (io_thread_tcb_s *data, int command);
io_thread_tcb_s *create_io_thread();
void destroy_io_thread(io_thread_tcb_s *p);
int transport_acquire (DBusConnection *conn, char *transport_path, int *fd, int *read_mtu, int *write_mtu);
int transport_release (DBusConnection *conn, char *transport_path);
// globals
int quit=0; // when set to 1, program terminates
int run_once = 0; // only run output once, then exit
//////////////////////////////// DBUS HELPERS ////////////////////////////////
/*****************//**
* Handle dbus error and clear error message block
*
* @param [in] The error object
* @param [in] function where the error happens
* @param [in] line number where the error happens
* @returns TRUE if successful, FALSE otherwise
********************/
int handle_dbus_error (DBusError *err, const char *func, int line) {
if (dbus_error_is_set (err)) {
fprintf(stderr, "DBus error %s at %u: %s\n", func, line, err->message);
dbus_error_free(err);
return 1;
}
return 0;
}
/*****************//**
* Connect to the system message bus
*
* @param [out] connection object, if function is successful, other wise it is unchanged.
* @returns TRUE if successful, FALSE otherwise
********************/
int get_system_bus(DBusConnection **system_bus) {
DBusError err;
DBusConnection* conn;
dbus_error_init(&err);
conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
handle_dbus_error (&err, __FUNCTION__, __LINE__);
if (NULL == conn) return 0;
*system_bus = conn;
debug_print("Name %s\n", dbus_bus_get_unique_name (conn));
return 1;
}
/*****************//**
* Get the bluetooth device's path
*
* @param [in] connection to use
* @param [in] adapter to use (hci0, or bluetooth address, or NULL to use default)
* @param [out] the object path, if function is successful, other wise it is unchanged.
* @returns TRUE if successful, FALSE otherwise
********************/
int get_bluetooth_object(DBusConnection* conn, char *device, char **dev_path) {
DBusMessage *msg, *reply;
DBusMessageIter iter;
DBusError err;
char *s, *method = FIND_ADAPTER;
dbus_error_init(&err);
debug_print("Getting object path for adapter %s\n", device);
// create a new method call msg
if (!device) method = DEFAULT_ADAPTER;
msg = dbus_message_new_method_call("org.bluez",
"/", // object to call on
"org.bluez.Manager", // interface to call on
method); // method name
// append arguments
dbus_message_iter_init_append(msg, &iter);
if (device) dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &device);
// send message and wait for reply, -1 means wait forever
reply = dbus_connection_send_with_reply_and_block (conn, msg, -1, &err);
handle_dbus_error (&err, __FUNCTION__, __LINE__);
if (!reply) {
fprintf(stderr, "Reply Null\n");
return 0;
}
// read the parameters
if (dbus_message_iter_init(reply, &iter) &&
DBUS_TYPE_OBJECT_PATH == dbus_message_iter_get_arg_type(&iter))
dbus_message_iter_get_basic(&iter, &s);
else return 0;
// free reply and close connection
debug_print("Object path for %s is %s\n", device, s);
dbus_message_unref(msg);
dbus_message_unref(reply);
*dev_path = strdup (s);
return 1;
}
/*****************//**
* Add a dict entry of a variant of simple types
*
* @param [in] array iter to add to
* @param [in] key
* @param [in] type (must be simple types)
* @param [in] value
********************/
void util_add_dict_variant_entry (DBusMessageIter *iter, char *key, int type, void *value) {
DBusMessageIter dict, variant;
dbus_message_iter_open_container (iter, DBUS_TYPE_DICT_ENTRY, NULL, &dict);
dbus_message_iter_append_basic (&dict, DBUS_TYPE_STRING, &key);
dbus_message_iter_open_container (&dict, DBUS_TYPE_VARIANT, (char *)&type, &variant);
dbus_message_iter_append_basic (&variant, type, &value);
dbus_message_iter_close_container (&dict, &variant);
dbus_message_iter_close_container (iter, &dict);
}
/*****************//**
* Add a dict entry of an array of of simple types
*
* @param [in] array iter to add to
* @param [in] key
* @param [in] type (must be simple types)
* @param [in] pointer to the array
* @param [in] number of elements (not size in bytes!)
********************/
void util_add_dict_array_entry (DBusMessageIter *iter, char *key, int type, void *buf, int elements) {
DBusMessageIter dict, variant, array;
char array_type[5] = "a";
strncat (array_type, (char*)&type, sizeof(array_type));
dbus_message_iter_open_container (iter, DBUS_TYPE_DICT_ENTRY, NULL, &dict);
dbus_message_iter_append_basic (&dict, DBUS_TYPE_STRING, &key);
dbus_message_iter_open_container (&dict, DBUS_TYPE_VARIANT, array_type, &variant);
dbus_message_iter_open_container (&variant, DBUS_TYPE_ARRAY, (char *)&type, &array);
dbus_message_iter_append_fixed_array (&array, type, &buf, elements);
dbus_message_iter_close_container (&variant, &array);
dbus_message_iter_close_container (&dict, &variant);
dbus_message_iter_close_container (iter, &dict);
}
//////////////////////////////// BLUEZ AUDIO/MEDIA HELPERS ////////////////////////////////
/*****************//**
* Register our "endpoint" handler to bluez audio system.
* As part of its job, it returns supported codecs and codec parameters, as well
* as what functions are we doing here (A2DP source, A2DP sink, HFP, etc - for
* this program it will be A2DP sink).
*
* @param [in] system bus connection
* @param [in] bluetooth object to register to
* @returns TRUE means ok, FALSE means something is wrong
********************/
int media_register_endpoint(DBusConnection* conn, char *bt_object, char *endpoint, char *uuid) {
DBusMessage *msg, *reply;
DBusMessageIter iter, iterarray;
DBusError err;
a2dp_sbc_t capabilities;
capabilities.channel_mode = BT_A2DP_CHANNEL_MODE_MONO | BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL |
BT_A2DP_CHANNEL_MODE_STEREO | BT_A2DP_CHANNEL_MODE_JOINT_STEREO;
capabilities.frequency = BT_SBC_SAMPLING_FREQ_16000 | BT_SBC_SAMPLING_FREQ_32000 |
BT_SBC_SAMPLING_FREQ_44100 | BT_SBC_SAMPLING_FREQ_48000;
capabilities.allocation_method = BT_A2DP_ALLOCATION_SNR | BT_A2DP_ALLOCATION_LOUDNESS;
capabilities.subbands = BT_A2DP_SUBBANDS_4 | BT_A2DP_SUBBANDS_8;
capabilities.block_length = BT_A2DP_BLOCK_LENGTH_4 | BT_A2DP_BLOCK_LENGTH_8 |
BT_A2DP_BLOCK_LENGTH_12 | BT_A2DP_BLOCK_LENGTH_16;
capabilities.min_bitpool = MIN_BITPOOL;
capabilities.max_bitpool = MAX_BITPOOL;
dbus_error_init(&err);
msg = dbus_message_new_method_call("org.bluez",
bt_object, // object to call on
"org.bluez.Media", // interface to call on
"RegisterEndpoint"); // method name
//build the parameters
dbus_message_iter_init_append (msg, &iter);
//first param - object path
dbus_message_iter_append_basic (&iter, DBUS_TYPE_OBJECT_PATH, &endpoint);
//second param - properties
dbus_message_iter_open_container (&iter, DBUS_TYPE_ARRAY, "{sv}", &iterarray);
util_add_dict_variant_entry (&iterarray, "UUID", DBUS_TYPE_STRING, uuid);
util_add_dict_variant_entry (&iterarray, "Codec", DBUS_TYPE_BYTE, A2DP_CODEC_SBC);
util_add_dict_array_entry (&iterarray, "Capabilities", DBUS_TYPE_BYTE, &capabilities, sizeof (capabilities));
dbus_message_iter_close_container (&iter, &iterarray);
//char *buf; int buflen; dbus_message_marshal (msg, &buf, &buflen); write (1, buf, buflen); return 0;
//make the call
reply = dbus_connection_send_with_reply_and_block (conn, msg, -1, &err);
handle_dbus_error (&err, __FUNCTION__, __LINE__);
if (!reply) {
fprintf(stderr, "Reply Null\n");
return 0;
}
dbus_message_unref(msg);
dbus_message_unref(reply);
return 1;
}
/*****************//**
* Get the transport (ie, the actual file descriptor) for streaming (ie, read/write)
* the audio data
*
* @param [in] system bus connection
* @param [in] transport object path (must come from MediaEndpoint.SetConfiguration)
* @param [out] file descriptor
* @param [out] maximum size to read per transaction
* @param [out] maximum size to write per transaction
* @returns TRUE if ok, FALSE means something is wrong
********************/
int transport_acquire (DBusConnection *conn, char *transport_path, int *fd, int *read_mtu, int *write_mtu) {
DBusMessage *msg, *reply;
DBusMessageIter iter;
DBusError err;
char *access_type = ACCESS_TYPE;
debug_print ("acquire %s\n", transport_path);
dbus_error_init(&err);
msg = dbus_message_new_method_call("org.bluez",
transport_path, // object to call on
"org.bluez.MediaTransport", // interface to call on
"Acquire"); // method name
//build the parameters
dbus_message_iter_init_append (msg, &iter);
dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &access_type);
//make the call
reply = dbus_connection_send_with_reply_and_block (conn, msg, -1, &err);
handle_dbus_error (&err, __FUNCTION__, __LINE__);
if (!reply) {
fprintf(stderr, "Reply Null\n");
return 0;
}
//read the reply
if (!dbus_message_get_args(reply, &err,
DBUS_TYPE_UNIX_FD, fd,
DBUS_TYPE_UINT16, read_mtu,
DBUS_TYPE_UINT16, write_mtu,
DBUS_TYPE_INVALID))
{
handle_dbus_error (&err, __FUNCTION__, __LINE__);
return 0;
}
//clean up
dbus_message_unref(msg);
dbus_message_unref(reply);
return 1;
}
/*****************//**
* Release the transport (ie, the file descriptor)
* Note: this doesn't need to be called if transport is closed by
* "MediaEndpoint.ClearConfiguration". It is only needed if the app wishes to
* release control of the fd while the stream is still active (e.g - suspend
* stream, pausing, etc).
*
* @param [in] system bus connection
* @param [in] transport object path (must come from MediaEndpoint.SetConfiguration)
********************/
int transport_release (DBusConnection *conn, char *transport_path) {
DBusMessage *msg, *reply;
DBusMessageIter iter;
DBusError err;
char *access_type = ACCESS_TYPE;
debug_print ("release %s\n", transport_path);
dbus_error_init(&err);
msg = dbus_message_new_method_call("org.bluez",
transport_path, // object to call on
"org.bluez.MediaTransport", // interface to call on
"Release"); // method name
//build the parameters
dbus_message_iter_init_append (msg, &iter);
dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &access_type);
//make the call
reply = dbus_connection_send_with_reply_and_block (conn, msg, -1, &err);
handle_dbus_error (&err, __FUNCTION__, __LINE__);
if (!reply) {
fprintf(stderr, "Reply Null\n");
return 0;
}
//clean up
dbus_message_unref(msg);
dbus_message_unref(reply);
return 1;
}
/*****************//**
* Helper to calculate the optimum bitpool, given the sampling frequency,
* and number of channels.
* Taken verbatim from pulseaudio 2.1
* (which took it from bluez audio - a2dp.c & pcm_bluetooth.c - default_bitpool)
*
* @param [in] frequency
* @param [in] channel mode
* @returns coded SBC bitpool
*********************/
static uint8_t a2dp_default_bitpool(uint8_t freq, uint8_t mode) {
switch (freq) {
case BT_SBC_SAMPLING_FREQ_16000:
case BT_SBC_SAMPLING_FREQ_32000:
return 53;
case BT_SBC_SAMPLING_FREQ_44100:
switch (mode) {
case BT_A2DP_CHANNEL_MODE_MONO:
case BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL:
return 31;
case BT_A2DP_CHANNEL_MODE_STEREO:
case BT_A2DP_CHANNEL_MODE_JOINT_STEREO:
return 53;
default:
fprintf (stderr, "Invalid channel mode %u", mode);
return 53;
}
case BT_SBC_SAMPLING_FREQ_48000:
switch (mode) {
case BT_A2DP_CHANNEL_MODE_MONO:
case BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL:
return 29;
case BT_A2DP_CHANNEL_MODE_STEREO:
case BT_A2DP_CHANNEL_MODE_JOINT_STEREO:
return 51;
default:
fprintf (stderr, "Invalid channel mode %u", mode);
return 51;
}
default:
fprintf (stderr, "Invalid sampling freq %u", freq);
return 53;
}
}
/*****************//**
* Helper to setup sbc params from a2dp_sbc_t
* Modified from pulseaudio 2.1 (which took it from bluez - pcm_bluetooth.c
* - bluetooth_a2dp_setup)
*
* @param [in] sbc codec configuration
* @param [in] bluez codec capability configuration
*********************/
void setup_sbc(sbc_t *sbc, a2dp_sbc_t *cap) {
switch (cap->frequency) {
case BT_SBC_SAMPLING_FREQ_16000:
sbc->frequency = SBC_FREQ_16000;
break;
case BT_SBC_SAMPLING_FREQ_32000:
sbc->frequency = SBC_FREQ_32000;
break;
case BT_SBC_SAMPLING_FREQ_44100:
sbc->frequency = SBC_FREQ_44100;
break;
case BT_SBC_SAMPLING_FREQ_48000:
sbc->frequency = SBC_FREQ_48000;
break;
default:
fprintf (stderr, "No supported frequency");
}
switch (cap->channel_mode) {
case BT_A2DP_CHANNEL_MODE_MONO:
sbc->mode = SBC_MODE_MONO;
break;
case BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL:
sbc->mode = SBC_MODE_DUAL_CHANNEL;
break;
case BT_A2DP_CHANNEL_MODE_STEREO:
sbc->mode = SBC_MODE_STEREO;
break;
case BT_A2DP_CHANNEL_MODE_JOINT_STEREO:
sbc->mode = SBC_MODE_JOINT_STEREO;
break;
default:
fprintf (stderr, "No supported channel_mode");
}
switch (cap->allocation_method) {
case BT_A2DP_ALLOCATION_SNR:
sbc->allocation = SBC_AM_SNR;
break;
case BT_A2DP_ALLOCATION_LOUDNESS:
sbc->allocation = SBC_AM_LOUDNESS;
break;
default:
fprintf (stderr, "No supported allocation");
}
switch (cap->subbands) {
case BT_A2DP_SUBBANDS_4:
sbc->subbands = SBC_SB_4;
break;
case BT_A2DP_SUBBANDS_8:
sbc->subbands = SBC_SB_8;
break;
default:
fprintf (stderr, "No supported subbands");
}
switch (cap->block_length) {
case BT_A2DP_BLOCK_LENGTH_4:
sbc->blocks = SBC_BLK_4;
break;
case BT_A2DP_BLOCK_LENGTH_8:
sbc->blocks = SBC_BLK_8;
break;
case BT_A2DP_BLOCK_LENGTH_12:
sbc->blocks = SBC_BLK_12;
break;
case BT_A2DP_BLOCK_LENGTH_16:
sbc->blocks = SBC_BLK_16;
break;
default:
fprintf (stderr, "No supported block length");
}
sbc->bitpool = cap->max_bitpool;
}
//////////////////////////////// BLUEZ AUDIO CALLBACK HANDLER ////////////////////////////////
/*****************//**
* Implement MediaEndpoint.SelectConfiguration.
* Called by bluez to negotiate which configuration (=codec, codec parameter)
* for audio streaming.
* This function will examine what the requested configuration and returns back
* a reply with the supported / agreed configuration.
*
* Chosen configuration isn't cached because it will be returned with SetConfiguration.
*
* Contains modified code taken from pulseaudio 2.1 (which took it from
* bluez audio, select_sbc_params (a2dp.c)
*
* @param [in] original "call" message from bluez
* @returns reply message (success or failure)
*********************/
DBusMessage* endpoint_select_configuration (DBusMessage *msg) {
a2dp_sbc_t *cap, config;
uint8_t *pconf = (uint8_t *) &config;
int size;
DBusMessage *reply;
DBusError err;
debug_print ("Select configuration\n");
dbus_error_init(&err);
if (!dbus_message_get_args(msg, &err, DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE, &cap, &size, DBUS_TYPE_INVALID)) {
handle_dbus_error (&err, __FUNCTION__, __LINE__);
goto fail;
}
//taken from pulseaudio with modification
memset(&config, 0, sizeof(config));
config.frequency = BT_SBC_SAMPLING_FREQ_44100;
if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_JOINT_STEREO)
config.channel_mode = BT_A2DP_CHANNEL_MODE_JOINT_STEREO;
else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_STEREO)
config.channel_mode = BT_A2DP_CHANNEL_MODE_STEREO;
else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL)
config.channel_mode = BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL;
else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_MONO) {
config.channel_mode = BT_A2DP_CHANNEL_MODE_MONO;
} else {
fprintf (stderr, "No supported channel modes");
goto fail;
}
if (cap->block_length & BT_A2DP_BLOCK_LENGTH_16)
config.block_length = BT_A2DP_BLOCK_LENGTH_16;
else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_12)
config.block_length = BT_A2DP_BLOCK_LENGTH_12;
else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_8)
config.block_length = BT_A2DP_BLOCK_LENGTH_8;
else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_4)
config.block_length = BT_A2DP_BLOCK_LENGTH_4;
else {
fprintf (stderr, "No supported block lengths");
goto fail;
}
if (cap->subbands & BT_A2DP_SUBBANDS_8)
config.subbands = BT_A2DP_SUBBANDS_8;
else if (cap->subbands & BT_A2DP_SUBBANDS_4)
config.subbands = BT_A2DP_SUBBANDS_4;
else {
fprintf (stderr, "No supported subbands");
goto fail;
}
if (cap->allocation_method & BT_A2DP_ALLOCATION_LOUDNESS)
config.allocation_method = BT_A2DP_ALLOCATION_LOUDNESS;
else if (cap->allocation_method & BT_A2DP_ALLOCATION_SNR)
config.allocation_method = BT_A2DP_ALLOCATION_SNR;
config.min_bitpool = (uint8_t) MAX(MIN_BITPOOL, cap->min_bitpool);
config.max_bitpool = (uint8_t) MIN(a2dp_default_bitpool(config.frequency, config.channel_mode), cap->max_bitpool);
reply = dbus_message_new_method_return(msg);
dbus_message_append_args (reply,
DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE, &pconf, size,
DBUS_TYPE_INVALID);
return reply;
fail:
return dbus_message_new_error(msg, "org.bluez.MediaEndpoint.Error.InvalidArguments",
"Unable to select configuration");
}
/*****************//**
* Implement MediaEndpoint.SetConfiguration.
* Called by bluez to confirm that this will be the configuration chosen.
* The most important thing here is the "transport object path", which we will
* need to get the actual file-descriptor for streaming later (see transport_acquire).
*
* In theory the transport_acquire could be called from here with some delays,
* in reality it is a lot better to do it after we've received confirmation that
* audio is "connected" (this is done by watching AudioSource.PropertyChange signal)
*
* This function is too complicated for what it does, for our (simple) purpose
* we actually only need the transport_path so we don't have to parse all the parameters,
* but we do anyway.
*
* @param [in] original "call" message from bluez
* @param [in] io thread hashtable
* @returns reply message (success or failure)
*********************/
DBusMessage* endpoint_set_configuration (DBusMessage *msg, io_thread_tcb_s **io_threads_table) {
const char *transport_path, *dev_path = NULL, *uuid = NULL, *cmd_path = NULL;
uint8_t *config = NULL;
int size = 0;
DBusMessageIter iter, iterprop, iterentry, itervalue, iterarray;
io_thread_tcb_s *head = *io_threads_table;
io_thread_tcb_s *io_data = NULL;
dbus_message_iter_init(msg, &iter);
dbus_message_iter_get_basic(&iter, &transport_path);
if (!dbus_message_iter_next(&iter))
goto fail;
dbus_message_iter_recurse(&iter, &iterprop);
if (dbus_message_iter_get_arg_type(&iterprop) != DBUS_TYPE_DICT_ENTRY)
goto fail;
/* Read transport properties */
while (dbus_message_iter_get_arg_type(&iterprop) == DBUS_TYPE_DICT_ENTRY) {
const char *key;
int var;
dbus_message_iter_recurse(&iterprop, &iterentry);
dbus_message_iter_get_basic(&iterentry, &key);
dbus_message_iter_next(&iterentry);
dbus_message_iter_recurse(&iterentry, &itervalue);
var = dbus_message_iter_get_arg_type(&itervalue);
if (strcasecmp(key, "UUID") == 0) {
if (var != DBUS_TYPE_STRING)
goto fail;
dbus_message_iter_get_basic(&itervalue, &uuid);
} else if (strcasecmp(key, "Device") == 0) {
if (var != DBUS_TYPE_OBJECT_PATH)
goto fail;
dbus_message_iter_get_basic(&itervalue, &dev_path);
} else if (strcasecmp(key, "Configuration") == 0) {
if (var != DBUS_TYPE_ARRAY)
goto fail;
dbus_message_iter_recurse(&itervalue, &iterarray);
dbus_message_iter_get_fixed_array(&iterarray, &config, &size);
}
dbus_message_iter_next(&iterprop);
}
debug_print ("Set configuration %s\n",transport_path);
//capture the transport_path and allocate the transport later, when the audiosource is "connected".
HASH_FIND_STR (head, transport_path, io_data);
if (!io_data) {
io_data = create_io_thread();
io_data->dev_path = strdup (dev_path);
io_data->transport_path = strdup (transport_path);
io_data->cap = *((a2dp_sbc_t*) config);
//read or write
cmd_path = (char *)dbus_message_get_path (msg);
if ( strcasecmp (cmd_path, A2DP_SINK_ENDPOINT) == 0)
io_data->write = 0;
else if ( strcasecmp (cmd_path, A2DP_SOURCE_ENDPOINT) == 0)
io_data->write = 1;
HASH_ADD_KEYPTR (hh, head, io_data->transport_path, strlen(io_data->transport_path), io_data);
*io_threads_table = head;
}
return dbus_message_new_method_return(msg);
fail:
return dbus_message_new_error(msg, "org.bluez.MediaEndpoint.Error.InvalidArguments",
"Unable to select configuration");
}
/*****************//**
* Implement MediaEndpoint.ClearConfiguration.
* Called by bluez to let us know that the audio streaming process has been reset
* for whatever reason, and we should do our own clean-up.
* Here we tell our I/O thread to stop.
*
* It is not necessary to call transport_release here because by the time we got here,
* the 'transport' has already been released.
*
* @param [in] original "call" message from bluez
* @param [in] io thread's data - to command I/O thread to stop.
* @returns reply message (success or failure)
*********************/
DBusMessage* endpoint_clear_configuration (DBusMessage *msg, io_thread_tcb_s **io_threads_table) {
DBusMessage *reply;
DBusError err;
DBusMessageIter iter;
char *transport_path;
io_thread_tcb_s *head = *io_threads_table;
io_thread_tcb_s *io_data = NULL;
dbus_error_init(&err);
dbus_message_iter_init(msg, &iter);
dbus_message_iter_get_basic(&iter, &transport_path);
debug_print ("Clear configuration %s\n",transport_path);
// stop stream
HASH_FIND_STR (head, transport_path, io_data);
if (io_data) {
debug_print ("stopping thread %p\n",io_data);
HASH_DEL (head, io_data);
*io_threads_table = head;
destroy_io_thread (io_data);
}
reply = dbus_message_new_method_return(msg);
return reply;
}
/*****************//**
* Implement MediaEndpoint.Release
* Called by bluez to let us know our registration (see register_endpoint) has been
* cancelled (or 'released'). The next logical action after this, is either:
* a) to exit
* b) to re-register.
*
* There is no need to 'Unregister' because by the time we get here, our endpoint
* has already been de-registered.
*
* @param [in] original "call" message from bluez
* @returns reply message (success or failure)
*********************/
DBusMessage* endpoint_release (DBusMessage *msg) {
debug_print ("Release endpoint\n");
DBusMessage *reply;
DBusError err;
dbus_error_init(&err);
reply = dbus_message_new_method_return(msg);
return reply;
}
//////////////////////////////// BLUEZ-DBUS SIGNAL HANDLERS ////////////////////////////////
/*****************//**
* Handle AudioSource.PropertyChanged
* Signalled by bluez to let us know that the state of the audio source has changed.
* We use this signal as a trigger for 'delayed' transport_acquire to get the file
* descriptor, as well as to start the I/O thread.
*
* We don't use the corresponding transport_release because for the time being
* we will never willingly release a transport, until it is closed by
* MediaEndpoint.ClearConfiguration (the I/O thread will be stopped there).
*
* Note: The 'source' and 'sink' terms used in bluez is super-confusing because
* they are not consistent - sometimes they view it from the bluez side
* (in this case, it's a 'source' because the bluez is the 'source' of the data,
* sometimes they view it as 'sink' because this application receives and acts as data sink
* for the remote-end.
*
* Note: There is a corresponding signal for AudioSink, which we don't use.
*
* @param [in] connection object to talk to DBus
* @param [in] original "call" message from bluez
* @param [in] write==0 -> audiosink, write==1 --> audiosource
* @param [in] head of I/O thread hashtable
* @returns reply message (success or failure)
*********************/
#define audiosink_property_changed audiosource_property_changed
void audiosource_property_changed (DBusConnection *conn, DBusMessage *msg, int write, io_thread_tcb_s **io_threads_table) {
DBusMessageIter iter, itervariant;
char *key;
char *dev_path;
char *state;
io_thread_tcb_s *head = *io_threads_table;
io_thread_tcb_s *io_data;
int new_state, transition, when_to_acquire, when_to_release;
dbus_message_iter_init (msg, &iter);
dbus_message_iter_get_basic (&iter, &key);
if (strcasecmp (key, "State") != 0) return; //we are only interested in this.
if (!dbus_message_iter_next(&iter)) goto fail;
dbus_message_iter_recurse(&iter, &itervariant);
if (dbus_message_iter_get_arg_type(&itervariant) != DBUS_TYPE_STRING) goto fail;
dbus_message_iter_get_basic (&itervariant, &state);
dev_path = (char *)dbus_message_get_path (msg);
debug_print ("state for %s: %s\n", dev_path, state);
//look for our thread
if (!head) return;
io_data = head;
do {
if (strcasecmp (dev_path, io_data->dev_path) == 0 &&
io_data->write == write)
break;
else io_data = io_data->hh.next;
} while (io_data && io_data != head);
if (!io_data) return;
//decode state & transition
new_state = transition = -1;
if ( strcasecmp (state, "connected") == 0 ) new_state = STATE_CONNECTED;
else if ( strcasecmp (state, "playing") == 0 ) new_state = STATE_PLAYING;
else if ( strcasecmp (state, "disconnected") == 0 ) new_state = STATE_DISCONNECTED;
if (new_state >= 0) {
transition = io_data->prev_state << 4 | new_state;
io_data->prev_state = new_state;
}
//our treatment of sink and source is a bit different
switch (write) {
case 0: // bt sink: bt --> alsa
when_to_acquire = STATE_CONNECTED << 4 | STATE_PLAYING;
when_to_release = STATE_PLAYING << 4 | STATE_CONNECTED;
break;
case 1: // bt source: alsa --> bt
when_to_acquire = STATE_DISCONNECTED << 4 | STATE_CONNECTED;
when_to_release = STATE_CONNECTED << 4 | STATE_DISCONNECTED;
break;
}
//acquire or release transport depending on the transitions
if (transition == when_to_acquire) {
if (transport_acquire (conn, io_data->transport_path, &io_data->fd, &io_data->read_mtu, &io_data->write_mtu)) {
debug_print ("fd: %d read mtu %d write mtu %d\n", io_data->fd, io_data->read_mtu, io_data->write_mtu);
io_thread_set_command (io_data, IO_CMD_RUNNING);
}
} else if (transition == when_to_release) {
transport_release (conn, io_data->transport_path);
io_thread_set_command (io_data, IO_CMD_IDLE);
}
return;
fail:
debug_print ("bad signal\n");
}
//////////////////////////////// IO THREAD HELPERS ////////////////////////////////
/*****************//**
* Send command to I/O thread in a thread-safe manner.
* Once given, it will also trigger I/O thread to start running (if it is not
* already is).
*
* Note: Once IO_CMD_TERMINATE is issued, it cannot be cancelled.
*
* @param [in] I/O thread control block
* @param [in] command to send
* @returns reply message (success or failure)
*********************/
void io_thread_set_command (io_thread_tcb_s *data, int command) {
pthread_mutex_lock (&data->mutex);
debug_print ("io cmd: %d\n", command);
if (data->command != IO_CMD_TERMINATE)
data->command = command;
pthread_mutex_unlock (&data->mutex);
pthread_cond_signal (&data->cond);
}
/*****************//**
* Create an I/O thread.
* This will create the thread control block and the thread itself.
* The created thread is already running but in suspended state.
*
* @returns newly created thread control block
*********************/
void *io_thread_run(void *ptr);
io_thread_tcb_s *create_io_thread() {
io_thread_tcb_s *p;
p = malloc (sizeof (io_thread_tcb_s));
memset (p, 0, sizeof (io_thread_tcb_s));
pthread_cond_init (&p->cond, NULL);
pthread_mutex_init (&p->mutex, NULL);
pthread_create (&p->t_handle, NULL, io_thread_run, p);
return p;
}
/*****************//**
* Destroy and existing an I/O thread.
* This will stop the terminate the thread, wait until it is really terminated,
* release the resources held by the thread, then free the tcb itself.
*
* @param [in] thread control block
*********************/
void destroy_io_thread(io_thread_tcb_s *p) {
if (p) {
io_thread_set_command (p, IO_CMD_TERMINATE);
pthread_join (p->t_handle, NULL);
pthread_cond_destroy (&p->cond);
pthread_mutex_destroy (&p->mutex);
if (p->transport_path) {
free (p->transport_path);
p->transport_path = NULL;
}
if (p->dev_path) {
free (p->dev_path);
p->dev_path = NULL;
}
free (p);
}
}
//////////////////////////////// IO THREAD ////////////////////////////////
/*****************//**
* Read stdin, encode it, and write output to bluez stream output
* Encoding function is taken from pulseaudio 2.1
*
* @param [in] I/O thread control block
* @param [in] run_once global variable
* @param [out] quit global variable (if the app should quit)
*********************/
void stream_bt_output(io_thread_tcb_s *data) {
void *buf, *encode_buf;
size_t bufsize, encode_bufsize;
struct pollfd pollin = { 0, POLLIN, 0 }, pollout = { data->fd, POLLOUT, 0 };
int timeout;
debug_print ("write to bt\n");
// get buffers
encode_bufsize = data->write_mtu;
encode_buf = malloc (encode_bufsize);
bufsize = (encode_bufsize / sbc_get_frame_length (&data->sbc)) * // max frames allowed in a packet
sbc_get_codesize(&data->sbc); // ensure all of our source will fit in a single packet
buf = malloc (bufsize);
//debug_print ("encode_buf %d buf %d", encode_bufsize, bufsize);
// stream
while (data->command == IO_CMD_RUNNING) {
ssize_t readlen;
// wait until stdin has some data
//debug_print ("waiting stdin\n");
pthread_mutex_unlock (&data->mutex);
timeout = poll (&pollin, 1, 1000); //delay 1s to allow others to update our state
pthread_mutex_lock (&data->mutex);
if (timeout == 0) continue;
if (timeout < 0) {
fprintf (stderr, "bt_write/stdin: %d\n", errno);
break;
}
// read stdin
readlen = read (0, buf, bufsize);
if (readlen == 0) { // stream closed
data->command = IO_CMD_TERMINATE;
if (run_once) quit = 1;
continue;
}
if (readlen < 0) continue;
// encode bluetooth