mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-01 22:58:47 -04:00
Add code from bluez/audio/ipc.[ch]
This commit is contained in:
João Paulo Rechi Vita
Lennart Poettering
parent
ffe76a2daf
commit
d8a0ec53da
2 changed files with 427 additions and 0 deletions
119
src/modules/bt-ipc.c
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119
src/modules/bt-ipc.c
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/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2004-2008 Marcel Holtmann <marcel@holtmann.org>
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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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#include "bt-ipc.h"
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/* This table contains the string representation for messages */
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static const char *strmsg[] = {
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"BT_GETCAPABILITIES_REQ",
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"BT_GETCAPABILITIES_RSP",
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"BT_SETCONFIGURATION_REQ",
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"BT_SETCONFIGURATION_RSP",
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"BT_STREAMSTART_REQ",
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"BT_STREAMSTART_RSP",
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"BT_STREAMSTOP_REQ",
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"BT_STREAMSTOP_RSP",
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"BT_STREAMSUSPEND_IND",
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"BT_STREAMRESUME_IND",
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"BT_CONTROL_REQ",
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"BT_CONTROL_RSP",
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"BT_CONTROL_IND",
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"BT_STREAMFD_IND",
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};
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int bt_audio_service_open()
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{
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int sk;
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int err;
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struct sockaddr_un addr = {
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AF_UNIX, BT_IPC_SOCKET_NAME
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};
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sk = socket(PF_LOCAL, SOCK_STREAM, 0);
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if (sk < 0) {
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err = errno;
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fprintf(stderr, "%s: Cannot open socket: %s (%d)\n",
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__FUNCTION__, strerror(err), err);
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errno = err;
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return -1;
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}
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if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
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err = errno;
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fprintf(stderr, "%s: connect() failed: %s (%d)\n",
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__FUNCTION__, strerror(err), err);
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close(sk);
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errno = err;
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return -1;
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}
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return sk;
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}
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int bt_audio_service_close(int sk)
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{
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return close(sk);
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}
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int bt_audio_service_get_data_fd(int sk)
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{
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char cmsg_b[CMSG_SPACE(sizeof(int))], m;
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int err, ret;
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struct iovec iov = { &m, sizeof(m) };
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struct msghdr msgh;
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struct cmsghdr *cmsg;
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memset(&msgh, 0, sizeof(msgh));
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msgh.msg_iov = &iov;
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msgh.msg_iovlen = 1;
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msgh.msg_control = &cmsg_b;
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msgh.msg_controllen = CMSG_LEN(sizeof(int));
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ret = recvmsg(sk, &msgh, 0);
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if (ret < 0) {
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err = errno;
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fprintf(stderr, "%s: Unable to receive fd: %s (%d)\n",
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__FUNCTION__, strerror(err), err);
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errno = err;
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return -1;
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}
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/* Receive auxiliary data in msgh */
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for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
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cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
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if (cmsg->cmsg_level == SOL_SOCKET
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&& cmsg->cmsg_type == SCM_RIGHTS)
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return (*(int *) CMSG_DATA(cmsg));
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}
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errno = EINVAL;
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return -1;
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}
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const char *bt_audio_strmsg(int type)
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{
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if (type < 0 || type > (sizeof(strmsg) / sizeof(strmsg[0])))
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return NULL;
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return strmsg[type];
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}
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308
src/modules/bt-ipc.h
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308
src/modules/bt-ipc.h
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@ -0,0 +1,308 @@
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/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2004-2008 Marcel Holtmann <marcel@holtmann.org>
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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_GETCAPABILITIES_REQ
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BT_GETCAPABILITIES_RSP-->
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on snd_pcm_hw_params
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<--BT_SETCONFIGURATION_REQ
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BT_SETCONFIGURATION_RSP-->
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on snd_pcm_prepare
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<--BT_STREAMSTART_REQ
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<Moves to streaming state>
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BT_STREAMSTART_RSP-->
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BT_STREAMFD_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_STREAMSTOP_REQ
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<Moves to open state>
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BT_STREAMSTOP_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_AUDIO_IPC_PACKET_SIZE 128
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#define BT_IPC_SOCKET_NAME "\0/org/bluez/audio"
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/* Generic message header definition, except for RSP messages */
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typedef struct {
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uint8_t msg_type;
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} __attribute__ ((packed)) bt_audio_msg_header_t;
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/* Generic message header definition, for all RSP messages */
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typedef struct {
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bt_audio_msg_header_t msg_h;
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uint8_t posix_errno;
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} __attribute__ ((packed)) bt_audio_rsp_msg_header_t;
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/* Messages list */
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#define BT_GETCAPABILITIES_REQ 0
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#define BT_GETCAPABILITIES_RSP 1
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#define BT_SETCONFIGURATION_REQ 2
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#define BT_SETCONFIGURATION_RSP 3
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#define BT_STREAMSTART_REQ 4
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#define BT_STREAMSTART_RSP 5
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#define BT_STREAMSTOP_REQ 6
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#define BT_STREAMSTOP_RSP 7
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#define BT_STREAMSUSPEND_IND 8
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#define BT_STREAMRESUME_IND 9
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#define BT_CONTROL_REQ 10
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#define BT_CONTROL_RSP 11
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#define BT_CONTROL_IND 12
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#define BT_STREAMFD_IND 13
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/* BT_GETCAPABILITIES_REQ */
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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_getcapabilities_req {
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bt_audio_msg_header_t h;
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char device[18]; /* Address of the remote Device */
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uint8_t transport; /* Requested transport */
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uint8_t flags; /* Requested flags */
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} __attribute__ ((packed));
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/* BT_GETCAPABILITIES_RSP */
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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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#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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typedef struct {
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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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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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struct bt_getcapabilities_rsp {
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bt_audio_rsp_msg_header_t rsp_h;
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uint8_t transport; /* Granted transport */
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sbc_capabilities_t sbc_capabilities; /* A2DP only */
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mpeg_capabilities_t mpeg_capabilities; /* A2DP only */
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uint16_t sampling_rate; /* SCO only */
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} __attribute__ ((packed));
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/* BT_SETCONFIGURATION_REQ */
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struct bt_setconfiguration_req {
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bt_audio_msg_header_t h;
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char device[18]; /* Address of the remote Device */
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uint8_t transport; /* Requested transport */
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uint8_t access_mode; /* Requested access mode */
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sbc_capabilities_t sbc_capabilities; /* A2DP only - only one of this field
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and next one must be filled */
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mpeg_capabilities_t mpeg_capabilities; /* A2DP only */
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} __attribute__ ((packed));
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/* BT_SETCONFIGURATION_RSP */
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struct bt_setconfiguration_rsp {
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bt_audio_rsp_msg_header_t rsp_h;
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uint8_t transport; /* Granted transport */
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uint8_t access_mode; /* Granted access mode */
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uint16_t link_mtu; /* Max length that transport supports */
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} __attribute__ ((packed));
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/* BT_STREAMSTART_REQ */
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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_streamstart_req {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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/* BT_STREAMSTART_RSP */
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struct bt_streamstart_rsp {
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bt_audio_rsp_msg_header_t rsp_h;
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} __attribute__ ((packed));
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/* BT_STREAMFD_IND */
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/* This message is followed by one byte of data containing the stream data fd
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as ancilliary data */
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struct bt_streamfd_ind {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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/* BT_STREAMSTOP_REQ */
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struct bt_streamstop_req {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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/* BT_STREAMSTOP_RSP */
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struct bt_streamstop_rsp {
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bt_audio_rsp_msg_header_t rsp_h;
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} __attribute__ ((packed));
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/* BT_STREAMSUSPEND_IND */
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struct bt_streamsuspend_ind {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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/* BT_STREAMRESUME_IND */
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struct bt_streamresume_ind {
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bt_audio_msg_header_t h;
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} __attribute__ ((packed));
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/* BT_CONTROL_REQ */
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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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/* BT_CONTROL_RSP */
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struct bt_control_rsp {
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bt_audio_rsp_msg_header_t rsp_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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/* BT_CONTROL_IND */
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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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/* 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();
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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_strmsg(int type);
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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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