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https://git.kernel.org/pub/scm/bluetooth/bluez.git
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35906565c9
The header files with constants and structures for audio specific interaction with Pulseaudio are suppose to be under LGPL license. For some odd reason a2dp-codecs.h ended up being under GPL license which is against the intention of this being shared and re-used by non-GPL programs. Fix this now to avoid any future confusion.
362 lines
9.3 KiB
C
362 lines
9.3 KiB
C
/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/*
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Message sequence chart of streaming sequence for A2DP transport
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Audio daemon User
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on snd_pcm_open
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<--BT_GET_CAPABILITIES_REQ
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BT_GET_CAPABILITIES_RSP-->
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on snd_pcm_hw_params
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<--BT_SETCONFIGURATION_REQ
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BT_SET_CONFIGURATION_RSP-->
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on snd_pcm_prepare
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<--BT_START_STREAM_REQ
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<Moves to streaming state>
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BT_START_STREAM_RSP-->
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BT_NEW_STREAM_IND -->
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< streams data >
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..........
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on snd_pcm_drop/snd_pcm_drain
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<--BT_STOP_STREAM_REQ
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<Moves to open state>
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BT_STOP_STREAM_RSP-->
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on IPC close or appl crash
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<Moves to idle>
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*/
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#ifndef BT_AUDIOCLIENT_H
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#define BT_AUDIOCLIENT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#define BT_SUGGESTED_BUFFER_SIZE 512
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#define BT_IPC_SOCKET_NAME "\0/org/bluez/audio"
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/* Generic message header definition, except for RESPONSE messages */
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typedef struct {
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uint8_t type;
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uint8_t name;
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uint16_t length;
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} __attribute__ ((packed)) bt_audio_msg_header_t;
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typedef struct {
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bt_audio_msg_header_t h;
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uint8_t posix_errno;
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} __attribute__ ((packed)) bt_audio_error_t;
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/* Message types */
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#define BT_REQUEST 0
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#define BT_RESPONSE 1
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#define BT_INDICATION 2
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#define BT_ERROR 3
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/* Messages names */
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#define BT_GET_CAPABILITIES 0
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#define BT_OPEN 1
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#define BT_SET_CONFIGURATION 2
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#define BT_NEW_STREAM 3
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#define BT_START_STREAM 4
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#define BT_STOP_STREAM 5
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#define BT_CLOSE 6
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#define BT_CONTROL 7
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#define BT_DELAY_REPORT 8
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#define BT_CAPABILITIES_TRANSPORT_A2DP 0
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#define BT_CAPABILITIES_TRANSPORT_SCO 1
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#define BT_CAPABILITIES_TRANSPORT_ANY 2
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#define BT_CAPABILITIES_ACCESS_MODE_READ 1
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#define BT_CAPABILITIES_ACCESS_MODE_WRITE 2
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#define BT_CAPABILITIES_ACCESS_MODE_READWRITE 3
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#define BT_FLAG_AUTOCONNECT 1
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struct bt_get_capabilities_req {
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bt_audio_msg_header_t h;
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char source[18]; /* Address of the local Device */
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char destination[18];/* Address of the remote Device */
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char object[128]; /* DBus object path */
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uint8_t transport; /* Requested transport */
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uint8_t flags; /* Requested flags */
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uint8_t seid; /* Requested capability configuration */
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} __attribute__ ((packed));
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/**
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* SBC Codec parameters as per A2DP profile 1.0 § 4.3
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*/
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/* A2DP seid are 6 bytes long so HSP/HFP are assigned to 7-8 bits */
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#define BT_A2DP_SEID_RANGE (1 << 6) - 1
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#define BT_A2DP_SBC_SOURCE 0x00
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#define BT_A2DP_SBC_SINK 0x01
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#define BT_A2DP_MPEG12_SOURCE 0x02
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#define BT_A2DP_MPEG12_SINK 0x03
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#define BT_A2DP_MPEG24_SOURCE 0x04
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#define BT_A2DP_MPEG24_SINK 0x05
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#define BT_A2DP_ATRAC_SOURCE 0x06
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#define BT_A2DP_ATRAC_SINK 0x07
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#define BT_A2DP_UNKNOWN_SOURCE 0x08
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#define BT_A2DP_UNKNOWN_SINK 0x09
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#define BT_SBC_SAMPLING_FREQ_16000 (1 << 3)
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#define BT_SBC_SAMPLING_FREQ_32000 (1 << 2)
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#define BT_SBC_SAMPLING_FREQ_44100 (1 << 1)
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#define BT_SBC_SAMPLING_FREQ_48000 1
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#define BT_A2DP_CHANNEL_MODE_MONO (1 << 3)
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#define BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL (1 << 2)
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#define BT_A2DP_CHANNEL_MODE_STEREO (1 << 1)
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#define BT_A2DP_CHANNEL_MODE_JOINT_STEREO 1
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#define BT_A2DP_BLOCK_LENGTH_4 (1 << 3)
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#define BT_A2DP_BLOCK_LENGTH_8 (1 << 2)
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#define BT_A2DP_BLOCK_LENGTH_12 (1 << 1)
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#define BT_A2DP_BLOCK_LENGTH_16 1
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#define BT_A2DP_SUBBANDS_4 (1 << 1)
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#define BT_A2DP_SUBBANDS_8 1
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#define BT_A2DP_ALLOCATION_SNR (1 << 1)
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#define BT_A2DP_ALLOCATION_LOUDNESS 1
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#define BT_MPEG_SAMPLING_FREQ_16000 (1 << 5)
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#define BT_MPEG_SAMPLING_FREQ_22050 (1 << 4)
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#define BT_MPEG_SAMPLING_FREQ_24000 (1 << 3)
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#define BT_MPEG_SAMPLING_FREQ_32000 (1 << 2)
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#define BT_MPEG_SAMPLING_FREQ_44100 (1 << 1)
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#define BT_MPEG_SAMPLING_FREQ_48000 1
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#define BT_MPEG_LAYER_1 (1 << 2)
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#define BT_MPEG_LAYER_2 (1 << 1)
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#define BT_MPEG_LAYER_3 1
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#define BT_HFP_CODEC_PCM 0x00
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#define BT_PCM_FLAG_NREC 0x01
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#define BT_PCM_FLAG_PCM_ROUTING 0x02
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#define BT_WRITE_LOCK (1 << 1)
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#define BT_READ_LOCK 1
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typedef struct {
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uint8_t seid;
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uint8_t transport;
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uint8_t type;
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uint8_t length;
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uint8_t configured;
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uint8_t lock;
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uint8_t data[0];
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} __attribute__ ((packed)) codec_capabilities_t;
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typedef struct {
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codec_capabilities_t capability;
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uint8_t channel_mode;
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uint8_t frequency;
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uint8_t allocation_method;
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uint8_t subbands;
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uint8_t block_length;
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uint8_t min_bitpool;
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uint8_t max_bitpool;
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} __attribute__ ((packed)) sbc_capabilities_t;
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typedef struct {
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codec_capabilities_t capability;
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uint8_t channel_mode;
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uint8_t crc;
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uint8_t layer;
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uint8_t frequency;
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uint8_t mpf;
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uint16_t bitrate;
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} __attribute__ ((packed)) mpeg_capabilities_t;
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typedef struct {
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codec_capabilities_t capability;
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uint8_t flags;
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uint16_t sampling_rate;
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} __attribute__ ((packed)) pcm_capabilities_t;
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struct bt_get_capabilities_rsp {
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bt_audio_msg_header_t h;
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char source[18]; /* Address of the local Device */
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char destination[18];/* Address of the remote Device */
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char object[128]; /* DBus object path */
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uint8_t data[0]; /* First codec_capabilities_t */
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} __attribute__ ((packed));
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struct bt_open_req {
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bt_audio_msg_header_t h;
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char source[18]; /* Address of the local Device */
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char destination[18];/* Address of the remote Device */
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char object[128]; /* DBus object path */
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uint8_t seid; /* Requested capability configuration to lock */
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uint8_t lock; /* Requested lock */
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} __attribute__ ((packed));
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struct bt_open_rsp {
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bt_audio_msg_header_t h;
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char source[18]; /* Address of the local Device */
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char destination[18];/* Address of the remote Device */
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char object[128]; /* DBus object path */
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} __attribute__ ((packed));
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struct bt_set_configuration_req {
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bt_audio_msg_header_t h;
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codec_capabilities_t codec; /* Requested codec */
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} __attribute__ ((packed));
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struct bt_set_configuration_rsp {
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bt_audio_msg_header_t h;
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uint16_t link_mtu; /* Max length that transport supports */
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} __attribute__ ((packed));
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#define BT_STREAM_ACCESS_READ 0
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#define BT_STREAM_ACCESS_WRITE 1
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#define BT_STREAM_ACCESS_READWRITE 2
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struct bt_start_stream_req {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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struct bt_start_stream_rsp {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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/* This message is followed by one byte of data containing the stream data fd
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as ancillary data */
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struct bt_new_stream_ind {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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struct bt_stop_stream_req {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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struct bt_stop_stream_rsp {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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struct bt_close_req {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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struct bt_close_rsp {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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struct bt_suspend_stream_ind {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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struct bt_resume_stream_ind {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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#define BT_CONTROL_KEY_POWER 0x40
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#define BT_CONTROL_KEY_VOL_UP 0x41
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#define BT_CONTROL_KEY_VOL_DOWN 0x42
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#define BT_CONTROL_KEY_MUTE 0x43
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#define BT_CONTROL_KEY_PLAY 0x44
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#define BT_CONTROL_KEY_STOP 0x45
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#define BT_CONTROL_KEY_PAUSE 0x46
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#define BT_CONTROL_KEY_RECORD 0x47
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#define BT_CONTROL_KEY_REWIND 0x48
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#define BT_CONTROL_KEY_FAST_FORWARD 0x49
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#define BT_CONTROL_KEY_EJECT 0x4A
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#define BT_CONTROL_KEY_FORWARD 0x4B
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#define BT_CONTROL_KEY_BACKWARD 0x4C
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struct bt_control_req {
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bt_audio_msg_header_t h;
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uint8_t mode; /* Control Mode */
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uint8_t key; /* Control Key */
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} __attribute__ ((packed));
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struct bt_control_rsp {
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bt_audio_msg_header_t h;
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uint8_t mode; /* Control Mode */
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uint8_t key; /* Control Key */
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} __attribute__ ((packed));
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struct bt_control_ind {
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bt_audio_msg_header_t h;
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uint8_t mode; /* Control Mode */
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uint8_t key; /* Control Key */
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} __attribute__ ((packed));
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struct bt_delay_report_req {
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bt_audio_msg_header_t h;
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uint16_t delay;
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} __attribute__ ((packed));
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struct bt_delay_report_ind {
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bt_audio_msg_header_t h;
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uint16_t delay;
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} __attribute__ ((packed));
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/* Function declaration */
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/* Opens a connection to the audio service: return a socket descriptor */
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int bt_audio_service_open(void);
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/* Closes a connection to the audio service */
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int bt_audio_service_close(int sk);
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/* Receives stream data file descriptor : must be called after a
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BT_STREAMFD_IND message is returned */
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int bt_audio_service_get_data_fd(int sk);
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/* Human readable message type string */
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const char *bt_audio_strtype(uint8_t type);
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/* Human readable message name string */
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const char *bt_audio_strname(uint8_t name);
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#ifdef __cplusplus
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}
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#endif
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#endif /* BT_AUDIOCLIENT_H */
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