JackAlsaDriver.cpp
/*
Copyright (C) 2001 Paul Davis
Copyright (C) 2004 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define __STDC_FORMAT_MACROS // For inttypes.h to work in C++
#include <iostream>
#include <math.h>
#include <stdio.h>
#include <memory.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
#include <string.h>
#include "JackAlsaDriver.h"
#include "JackEngineControl.h"
#include "JackClientControl.h"
#include "JackPort.h"
#include "JackGraphManager.h"
#include "JackLockedEngine.h"
#ifdef __ANDROID__
#include "JackAndroidThread.h"
#else
#include "JackPosixThread.h"
#endif
#include "JackCompilerDeps.h"
#include "JackServerGlobals.h"
static struct jack_constraint_enum_str_descriptor midi_constraint_descr_array[] =
{
{ "none", "no MIDI driver" },
{ "seq", "ALSA Sequencer driver" },
{ "raw", "ALSA RawMIDI driver" },
{ 0 }
};
static struct jack_constraint_enum_char_descriptor dither_constraint_descr_array[] =
{
{ 'n', "none" },
{ 'r', "rectangular" },
{ 's', "shaped" },
{ 't', "triangular" },
{ 0 }
};
namespace Jack
{
int JackAlsaDriver::SetBufferSize(jack_nframes_t buffer_size)
{
jack_log("JackAlsaDriver::SetBufferSize %ld", buffer_size);
int res = alsa_driver_reset_parameters((alsa_driver_t *)fDriver, buffer_size,
((alsa_driver_t *)fDriver)->user_nperiods,
((alsa_driver_t *)fDriver)->frame_rate);
if (res == 0) { // update fEngineControl and fGraphManager
JackAudioDriver::SetBufferSize(buffer_size); // Generic change, never fails
// ALSA specific
UpdateLatencies();
} else {
// Restore old values
alsa_driver_reset_parameters((alsa_driver_t *)fDriver, fEngineControl->fBufferSize,
((alsa_driver_t *)fDriver)->user_nperiods,
((alsa_driver_t *)fDriver)->frame_rate);
}
return res;
}
void JackAlsaDriver::UpdateLatencies()
{
jack_latency_range_t range;
alsa_driver_t* alsa_driver = (alsa_driver_t*)fDriver;
for (int i = 0; i < fCaptureChannels; i++) {
range.min = range.max = alsa_driver->frames_per_cycle + alsa_driver->capture_frame_latency;
fGraphManager->GetPort(fCapturePortList[i])->SetLatencyRange(JackCaptureLatency, &range);
}
for (int i = 0; i < fPlaybackChannels; i++) {
// Add one buffer more latency if "async" mode is used...
range.min = range.max = (alsa_driver->frames_per_cycle * (alsa_driver->user_nperiods - 1)) +
((fEngineControl->fSyncMode) ? 0 : fEngineControl->fBufferSize) + alsa_driver->playback_frame_latency;
fGraphManager->GetPort(fPlaybackPortList[i])->SetLatencyRange(JackPlaybackLatency, &range);
// Monitor port
if (fWithMonitorPorts) {
range.min = range.max = alsa_driver->frames_per_cycle;
fGraphManager->GetPort(fMonitorPortList[i])->SetLatencyRange(JackCaptureLatency, &range);
}
}
}
int JackAlsaDriver::Attach()
{
JackPort* port;
jack_port_id_t port_index;
unsigned long port_flags = (unsigned long)CaptureDriverFlags;
char name[REAL_JACK_PORT_NAME_SIZE+1];
char alias[REAL_JACK_PORT_NAME_SIZE+1];
assert(fCaptureChannels < DRIVER_PORT_NUM);
assert(fPlaybackChannels < DRIVER_PORT_NUM);
alsa_driver_t* alsa_driver = (alsa_driver_t*)fDriver;
if (alsa_driver->has_hw_monitoring)
port_flags |= JackPortCanMonitor;
// ALSA driver may have changed the values
JackAudioDriver::SetBufferSize(alsa_driver->frames_per_cycle);
JackAudioDriver::SetSampleRate(alsa_driver->frame_rate);
jack_log("JackAlsaDriver::Attach fBufferSize %ld fSampleRate %ld", fEngineControl->fBufferSize, fEngineControl->fSampleRate);
for (int i = 0; i < fCaptureChannels; i++) {
snprintf(alias, sizeof(alias), "%s:%s:out%d", fAliasName, fCaptureDriverName, i + 1);
snprintf(name, sizeof(name), "%s:capture_%d", fClientControl.fName, i + 1);
if (fEngine->PortRegister(fClientControl.fRefNum, name, JACK_DEFAULT_AUDIO_TYPE, (JackPortFlags)port_flags, fEngineControl->fBufferSize, &port_index) < 0) {
jack_error("driver: cannot register port for %s", name);
return -1;
}
port = fGraphManager->GetPort(port_index);
port->SetAlias(alias);
fCapturePortList[i] = port_index;
jack_log("JackAlsaDriver::Attach fCapturePortList[i] %ld ", port_index);
}
port_flags = (unsigned long)PlaybackDriverFlags;
for (int i = 0; i < fPlaybackChannels; i++) {
snprintf(alias, sizeof(alias), "%s:%s:in%d", fAliasName, fPlaybackDriverName, i + 1);
snprintf(name, sizeof(name), "%s:playback_%d", fClientControl.fName, i + 1);
if (fEngine->PortRegister(fClientControl.fRefNum, name, JACK_DEFAULT_AUDIO_TYPE, (JackPortFlags)port_flags, fEngineControl->fBufferSize, &port_index) < 0) {
jack_error("driver: cannot register port for %s", name);
return -1;
}
port = fGraphManager->GetPort(port_index);
port->SetAlias(alias);
fPlaybackPortList[i] = port_index;
jack_log("JackAlsaDriver::Attach fPlaybackPortList[i] %ld ", port_index);
// Monitor ports
if (fWithMonitorPorts) {
jack_log("Create monitor port");
snprintf(name, sizeof(name), "%s:monitor_%d", fClientControl.fName, i + 1);
if (fEngine->PortRegister(fClientControl.fRefNum, name, JACK_DEFAULT_AUDIO_TYPE, MonitorDriverFlags, fEngineControl->fBufferSize, &port_index) < 0) {
jack_error("ALSA: cannot register monitor port for %s", name);
} else {
fMonitorPortList[i] = port_index;
}
}
}
UpdateLatencies();
if (alsa_driver->midi) {
int err = (alsa_driver->midi->attach)(alsa_driver->midi);
if (err)
jack_error ("ALSA: cannot attach MIDI: %d", err);
}
return 0;
}
int JackAlsaDriver::Detach()
{
alsa_driver_t* alsa_driver = (alsa_driver_t*)fDriver;
if (alsa_driver->midi)
(alsa_driver->midi->detach)(alsa_driver->midi);
return JackAudioDriver::Detach();
}
extern "C" char* get_control_device_name(const char * device_name)
{
char * ctl_name;
const char * comma;
/* the user wants a hw or plughw device, the ctl name
* should be hw:x where x is the card identification.
* We skip the subdevice suffix that starts with comma */
if (strncasecmp(device_name, "plughw:", 7) == 0) {
/* skip the "plug" prefix" */
device_name += 4;
}
comma = strchr(device_name, ',');
if (comma == NULL) {
ctl_name = strdup(device_name);
if (ctl_name == NULL) {
jack_error("strdup(\"%s\") failed.", device_name);
}
} else {
ctl_name = strndup(device_name, comma - device_name);
if (ctl_name == NULL) {
jack_error("strndup(\"%s\", %u) failed.", device_name, (unsigned int)(comma - device_name));
}
}
return ctl_name;
}
static int card_to_num(const char* device)
{
int err;
char* ctl_name;
snd_ctl_card_info_t *card_info;
snd_ctl_t* ctl_handle;
int i = -1;
snd_ctl_card_info_alloca (&card_info);
ctl_name = get_control_device_name(device);
if (ctl_name == NULL) {
jack_error("get_control_device_name() failed.");
goto fail;
}
if ((err = snd_ctl_open (&ctl_handle, ctl_name, 0)) < 0) {
jack_error ("control open \"%s\" (%s)", ctl_name,
snd_strerror(err));
goto free;
}
if ((err = snd_ctl_card_info(ctl_handle, card_info)) < 0) {
jack_error ("control hardware info \"%s\" (%s)",
device, snd_strerror (err));
goto close;
}
i = snd_ctl_card_info_get_card(card_info);
close:
snd_ctl_close(ctl_handle);
free:
free(ctl_name);
fail:
return i;
}
int JackAlsaDriver::Open(jack_nframes_t nframes,
jack_nframes_t user_nperiods,
jack_nframes_t samplerate,
bool hw_monitoring,
bool hw_metering,
bool capturing,
bool playing,
DitherAlgorithm dither,
bool soft_mode,
bool monitor,
int inchannels,
int outchannels,
bool shorts_first,
const char* capture_driver_name,
const char* playback_driver_name,
jack_nframes_t capture_latency,
jack_nframes_t playback_latency,
const char* midi_driver_name)
{
// Generic JackAudioDriver Open
if (JackAudioDriver::Open(nframes, samplerate, capturing, playing,
inchannels, outchannels, monitor, capture_driver_name, playback_driver_name,
capture_latency, playback_latency) != 0) {
return -1;
}
alsa_midi_t *midi = 0;
#ifndef __ANDROID__
if (strcmp(midi_driver_name, "seq") == 0)
midi = alsa_seqmidi_new((jack_client_t*)this, 0);
else if (strcmp(midi_driver_name, "raw") == 0)
midi = alsa_rawmidi_new((jack_client_t*)this);
#endif
if (JackServerGlobals::on_device_acquire != NULL) {
int capture_card = card_to_num(capture_driver_name);
int playback_card = card_to_num(playback_driver_name);
char audio_name[32];
if (capture_card >= 0) {
snprintf(audio_name, sizeof(audio_name), "Audio%d", capture_card);
if (!JackServerGlobals::on_device_acquire(audio_name)) {
jack_error("Audio device %s cannot be acquired...", capture_driver_name);
return -1;
}
}
if (playback_card >= 0 && playback_card != capture_card) {
snprintf(audio_name, sizeof(audio_name), "Audio%d", playback_card);
if (!JackServerGlobals::on_device_acquire(audio_name)) {
jack_error("Audio device %s cannot be acquired...", playback_driver_name);
if (capture_card >= 0) {
snprintf(audio_name, sizeof(audio_name), "Audio%d", capture_card);
JackServerGlobals::on_device_release(audio_name);
}
return -1;
}
}
}
fDriver = alsa_driver_new ((char*)"alsa_pcm", (char*)playback_driver_name, (char*)capture_driver_name,
NULL,
nframes,
user_nperiods,
samplerate,
hw_monitoring,
hw_metering,
capturing,
playing,
dither,
soft_mode,
monitor,
inchannels,
outchannels,
shorts_first,
capture_latency,
playback_latency,
midi);
if (fDriver) {
// ALSA driver may have changed the in/out values
fCaptureChannels = ((alsa_driver_t *)fDriver)->capture_nchannels;
fPlaybackChannels = ((alsa_driver_t *)fDriver)->playback_nchannels;
return 0;
} else {
Close();
return -1;
}
}
int JackAlsaDriver::Close()
{
// Generic audio driver close
int res = JackAudioDriver::Close();
if (fDriver) {
alsa_driver_delete((alsa_driver_t*)fDriver);
}
if (JackServerGlobals::on_device_release != NULL)
{
char audio_name[32];
int capture_card = card_to_num(fCaptureDriverName);
if (capture_card >= 0) {
snprintf(audio_name, sizeof(audio_name), "Audio%d", capture_card);
JackServerGlobals::on_device_release(audio_name);
}
int playback_card = card_to_num(fPlaybackDriverName);
if (playback_card >= 0 && playback_card != capture_card) {
snprintf(audio_name, sizeof(audio_name), "Audio%d", playback_card);
JackServerGlobals::on_device_release(audio_name);
}
}
return res;
}
int JackAlsaDriver::Start()
{
int res = JackAudioDriver::Start();
if (res >= 0) {
res = alsa_driver_start((alsa_driver_t *)fDriver);
if (res < 0) {
JackAudioDriver::Stop();
}
}
return res;
}
int JackAlsaDriver::Stop()
{
int res = alsa_driver_stop((alsa_driver_t *)fDriver);
if (JackAudioDriver::Stop() < 0) {
res = -1;
}
return res;
}
int JackAlsaDriver::Read()
{
/* Taken from alsa_driver_run_cycle */
int wait_status;
jack_nframes_t nframes;
fDelayedUsecs = 0.f;
retry:
nframes = alsa_driver_wait((alsa_driver_t *)fDriver, -1, &wait_status, &fDelayedUsecs);
if (wait_status < 0)
return -1; /* driver failed */
if (nframes == 0) {
/* we detected an xrun and restarted: notify
* clients about the delay.
*/
jack_log("ALSA XRun wait_status = %d", wait_status);
NotifyXRun(fBeginDateUst, fDelayedUsecs);
goto retry; /* recoverable error*/
}
if (nframes != fEngineControl->fBufferSize)
jack_log("JackAlsaDriver::Read warning fBufferSize = %ld nframes = %ld", fEngineControl->fBufferSize, nframes);
// Has to be done before read
JackDriver::CycleIncTime();
return alsa_driver_read((alsa_driver_t *)fDriver, fEngineControl->fBufferSize);
}
int JackAlsaDriver::Write()
{
return alsa_driver_write((alsa_driver_t *)fDriver, fEngineControl->fBufferSize);
}
void JackAlsaDriver::ReadInputAux(jack_nframes_t orig_nframes, snd_pcm_sframes_t contiguous, snd_pcm_sframes_t nread)
{
for (int chn = 0; chn < fCaptureChannels; chn++) {
if (fGraphManager->GetConnectionsNum(fCapturePortList[chn]) > 0) {
jack_default_audio_sample_t* buf = (jack_default_audio_sample_t*)fGraphManager->GetBuffer(fCapturePortList[chn], orig_nframes);
alsa_driver_read_from_channel((alsa_driver_t *)fDriver, chn, buf + nread, contiguous);
}
}
}
void JackAlsaDriver::MonitorInputAux()
{
for (int chn = 0; chn < fCaptureChannels; chn++) {
JackPort* port = fGraphManager->GetPort(fCapturePortList[chn]);
if (port->MonitoringInput()) {
((alsa_driver_t *)fDriver)->input_monitor_mask |= (1 << chn);
}
}
}
void JackAlsaDriver::ClearOutputAux()
{
for (int chn = 0; chn < fPlaybackChannels; chn++) {
jack_default_audio_sample_t* buf =
(jack_default_audio_sample_t*)fGraphManager->GetBuffer(fPlaybackPortList[chn], fEngineControl->fBufferSize);
memset(buf, 0, sizeof (jack_default_audio_sample_t) * fEngineControl->fBufferSize);
}
}
void JackAlsaDriver::SetTimetAux(jack_time_t time)
{
fBeginDateUst = time;
}
void JackAlsaDriver::WriteOutputAux(jack_nframes_t orig_nframes, snd_pcm_sframes_t contiguous, snd_pcm_sframes_t nwritten)
{
for (int chn = 0; chn < fPlaybackChannels; chn++) {
// Output ports
if (fGraphManager->GetConnectionsNum(fPlaybackPortList[chn]) > 0) {
jack_default_audio_sample_t* buf = (jack_default_audio_sample_t*)fGraphManager->GetBuffer(fPlaybackPortList[chn], orig_nframes);
alsa_driver_write_to_channel(((alsa_driver_t *)fDriver), chn, buf + nwritten, contiguous);
// Monitor ports
if (fWithMonitorPorts && fGraphManager->GetConnectionsNum(fMonitorPortList[chn]) > 0) {
jack_default_audio_sample_t* monbuf = (jack_default_audio_sample_t*)fGraphManager->GetBuffer(fMonitorPortList[chn], orig_nframes);
memcpy(monbuf + nwritten, buf + nwritten, contiguous * sizeof(jack_default_audio_sample_t));
}
}
}
}
int JackAlsaDriver::is_realtime() const
{
return fEngineControl->fRealTime;
}
int JackAlsaDriver::create_thread(pthread_t *thread, int priority, int realtime, void *(*start_routine)(void*), void *arg)
{
#ifdef __ANDROID__
return JackAndroidThread::StartImp(thread, priority, realtime, start_routine, arg);
#else
return JackPosixThread::StartImp(thread, priority, realtime, start_routine, arg);
#endif
}
jack_port_id_t JackAlsaDriver::port_register(const char *port_name, const char *port_type, unsigned long flags, unsigned long buffer_size)
{
jack_port_id_t port_index;
int res = fEngine->PortRegister(fClientControl.fRefNum, port_name, port_type, flags, buffer_size, &port_index);
return (res == 0) ? port_index : 0;
}
int JackAlsaDriver::port_unregister(jack_port_id_t port_index)
{
return fEngine->PortUnRegister(fClientControl.fRefNum, port_index);
}
void* JackAlsaDriver::port_get_buffer(int port, jack_nframes_t nframes)
{
return fGraphManager->GetBuffer(port, nframes);
}
int JackAlsaDriver::port_set_alias(int port, const char* name)
{
return fGraphManager->GetPort(port)->SetAlias(name);
}
jack_nframes_t JackAlsaDriver::get_sample_rate() const
{
return fEngineControl->fSampleRate;
}
jack_nframes_t JackAlsaDriver::frame_time() const
{
JackTimer timer;
fEngineControl->ReadFrameTime(&timer);
return timer.Time2Frames(GetMicroSeconds(), fEngineControl->fBufferSize);
}
jack_nframes_t JackAlsaDriver::last_frame_time() const
{
JackTimer timer;
fEngineControl->ReadFrameTime(&timer);
return timer.CurFrame();
}
} // end of namespace
#ifdef __cplusplus
extern "C"
{
#endif
static
jack_driver_param_constraint_desc_t *
enum_alsa_devices()
{
snd_ctl_t * handle;
snd_ctl_card_info_t * info;
snd_pcm_info_t * pcminfo_capture;
snd_pcm_info_t * pcminfo_playback;
int card_no = -1;
jack_driver_param_value_t card_id;
jack_driver_param_value_t device_id;
char description[64];
int device_no;
bool has_capture;
bool has_playback;
jack_driver_param_constraint_desc_t * constraint_ptr;
uint32_t array_size = 0;
snd_ctl_card_info_alloca(&info);
snd_pcm_info_alloca(&pcminfo_capture);
snd_pcm_info_alloca(&pcminfo_playback);
constraint_ptr = NULL;
while(snd_card_next(&card_no) >= 0 && card_no >= 0)
{
snprintf(card_id.str, sizeof(card_id.str), "hw:%d", card_no);
if (snd_ctl_open(&handle, card_id.str, 0) >= 0 &&
snd_ctl_card_info(handle, info) >= 0)
{
snprintf(card_id.str, sizeof(card_id.str), "hw:%s", snd_ctl_card_info_get_id(info));
if (!jack_constraint_add_enum(
&constraint_ptr,
&array_size,
&card_id,
snd_ctl_card_info_get_name(info)))
goto fail;
device_no = -1;
while (snd_ctl_pcm_next_device(handle, &device_no) >= 0 && device_no != -1)
{
snprintf(device_id.str, sizeof(device_id.str), "%s,%d", card_id.str, device_no);
snd_pcm_info_set_device(pcminfo_capture, device_no);
snd_pcm_info_set_subdevice(pcminfo_capture, 0);
snd_pcm_info_set_stream(pcminfo_capture, SND_PCM_STREAM_CAPTURE);
has_capture = snd_ctl_pcm_info(handle, pcminfo_capture) >= 0;
snd_pcm_info_set_device(pcminfo_playback, device_no);
snd_pcm_info_set_subdevice(pcminfo_playback, 0);
snd_pcm_info_set_stream(pcminfo_playback, SND_PCM_STREAM_PLAYBACK);
has_playback = snd_ctl_pcm_info(handle, pcminfo_playback) >= 0;
if (has_capture && has_playback)
{
snprintf(description, sizeof(description),"%s (duplex)", snd_pcm_info_get_name(pcminfo_capture));
}
else if (has_capture)
{
snprintf(description, sizeof(description),"%s (capture)", snd_pcm_info_get_name(pcminfo_capture));
}
else if (has_playback)
{
snprintf(description, sizeof(description),"%s (playback)", snd_pcm_info_get_name(pcminfo_playback));
}
else
{
continue;
}
if (!jack_constraint_add_enum(
&constraint_ptr,
&array_size,
&device_id,
description))
goto fail;
}
snd_ctl_close(handle);
}
}
return constraint_ptr;
fail:
jack_constraint_free(constraint_ptr);
return NULL;
}
static int
dither_opt (char c, DitherAlgorithm* dither)
{
switch (c) {
case '-':
case 'n':
*dither = None;
break;
case 'r':
*dither = Rectangular;
break;
case 's':
*dither = Shaped;
break;
case 't':
*dither = Triangular;
break;
default:
fprintf (stderr, "ALSA driver: illegal dithering mode %c\n", c);
return -1;
}
return 0;
}
SERVER_EXPORT const jack_driver_desc_t* driver_get_descriptor ()
{
jack_driver_desc_t * desc;
jack_driver_desc_filler_t filler;
jack_driver_param_value_t value;
desc = jack_driver_descriptor_construct("alsa", JackDriverMaster, "Linux ALSA API based audio backend", &filler);
strcpy(value.str, "hw:0");
#ifdef __ANDROID__
jack_driver_descriptor_add_parameter(desc, &filler, "device", 'd', JackDriverParamString, &value, NULL, "ALSA device name", NULL);
#else
jack_driver_descriptor_add_parameter(desc, &filler, "device", 'd', JackDriverParamString, &value, enum_alsa_devices(), "ALSA device name", NULL);
#endif
strcpy(value.str, "none");
jack_driver_descriptor_add_parameter(desc, &filler, "capture", 'C', JackDriverParamString, &value, NULL, "Provide capture ports. Optionally set device", NULL);
jack_driver_descriptor_add_parameter(desc, &filler, "playback", 'P', JackDriverParamString, &value, NULL, "Provide playback ports. Optionally set device", NULL);
value.ui = 48000U;
jack_driver_descriptor_add_parameter(desc, &filler, "rate", 'r', JackDriverParamUInt, &value, NULL, "Sample rate", NULL);
value.ui = 1024U;
jack_driver_descriptor_add_parameter(desc, &filler, "period", 'p', JackDriverParamUInt, &value, NULL, "Frames per period", NULL);
value.ui = 2U;
jack_driver_descriptor_add_parameter(desc, &filler, "nperiods", 'n', JackDriverParamUInt, &value, NULL, "Number of periods of playback latency", NULL);
value.i = 0;
jack_driver_descriptor_add_parameter(desc, &filler, "hwmon", 'H', JackDriverParamBool, &value, NULL, "Hardware monitoring, if available", NULL);
value.i = 0;
jack_driver_descriptor_add_parameter(desc, &filler, "hwmeter", 'M', JackDriverParamBool, &value, NULL, "Hardware metering, if available", NULL);
value.i = 1;
jack_driver_descriptor_add_parameter(desc, &filler, "duplex", 'D', JackDriverParamBool, &value, NULL, "Provide both capture and playback ports", NULL);
value.i = 0;
jack_driver_descriptor_add_parameter(desc, &filler, "softmode", 's', JackDriverParamBool, &value, NULL, "Soft-mode, no xrun handling", NULL);
value.i = 0;
jack_driver_descriptor_add_parameter(desc, &filler, "monitor", 'm', JackDriverParamBool, &value, NULL, "Provide monitor ports for the output", NULL);
value.c = 'n';
jack_driver_descriptor_add_parameter(
desc,
&filler,
"dither",
'z',
JackDriverParamChar,
&value,
jack_constraint_compose_enum_char(
JACK_CONSTRAINT_FLAG_STRICT | JACK_CONSTRAINT_FLAG_FAKE_VALUE,
dither_constraint_descr_array),
"Dithering mode",
NULL);
value.ui = 0;
jack_driver_descriptor_add_parameter(desc, &filler, "inchannels", 'i', JackDriverParamUInt, &value, NULL, "Number of capture channels (defaults to hardware max)", NULL);
jack_driver_descriptor_add_parameter(desc, &filler, "outchannels", 'o', JackDriverParamUInt, &value, NULL, "Number of playback channels (defaults to hardware max)", NULL);
value.i = FALSE;
jack_driver_descriptor_add_parameter(desc, &filler, "shorts", 'S', JackDriverParamBool, &value, NULL, "Try 16-bit samples before 32-bit", NULL);
value.ui = 0;
jack_driver_descriptor_add_parameter(desc, &filler, "input-latency", 'I', JackDriverParamUInt, &value, NULL, "Extra input latency (frames)", NULL);
jack_driver_descriptor_add_parameter(desc, &filler, "output-latency", 'O', JackDriverParamUInt, &value, NULL, "Extra output latency (frames)", NULL);
strcpy(value.str, "none");
jack_driver_descriptor_add_parameter(
desc,
&filler,
"midi-driver",
'X',
JackDriverParamString,
&value,
jack_constraint_compose_enum_str(
JACK_CONSTRAINT_FLAG_STRICT | JACK_CONSTRAINT_FLAG_FAKE_VALUE,
midi_constraint_descr_array),
"ALSA MIDI driver",
NULL);
return desc;
}
static Jack::JackAlsaDriver* g_alsa_driver;
SERVER_EXPORT Jack::JackDriverClientInterface* driver_initialize(Jack::JackLockedEngine* engine, Jack::JackSynchro* table, const JSList* params)
{
jack_nframes_t srate = 48000;
jack_nframes_t frames_per_interrupt = 1024;
unsigned long user_nperiods = 2;
const char *playback_pcm_name = "hw:0";
const char *capture_pcm_name = "hw:0";
int hw_monitoring = FALSE;
int hw_metering = FALSE;
int capture = FALSE;
int playback = FALSE;
int soft_mode = FALSE;
int monitor = FALSE;
DitherAlgorithm dither = None;
int user_capture_nchnls = 0;
int user_playback_nchnls = 0;
int shorts_first = FALSE;
jack_nframes_t systemic_input_latency = 0;
jack_nframes_t systemic_output_latency = 0;
const JSList * node;
const jack_driver_param_t * param;
const char *midi_driver = "none";
for (node = params; node; node = jack_slist_next (node)) {
param = (const jack_driver_param_t *) node->data;
switch (param->character) {
case 'C':
capture = TRUE;
if (strcmp (param->value.str, "none") != 0) {
capture_pcm_name = strdup (param->value.str);
jack_log("capture device %s", capture_pcm_name);
}
break;
case 'P':
playback = TRUE;
if (strcmp (param->value.str, "none") != 0) {
playback_pcm_name = strdup (param->value.str);
jack_log("playback device %s", playback_pcm_name);
}
break;
case 'D':
playback = TRUE;
capture = TRUE;
break;
case 'd':
if (strcmp (param->value.str, "none") != 0) {
playback_pcm_name = strdup (param->value.str);
capture_pcm_name = strdup (param->value.str);
jack_log("playback device %s", playback_pcm_name);
jack_log("capture device %s", capture_pcm_name);
}
break;
case 'H':
hw_monitoring = param->value.i;
break;
case 'm':
monitor = param->value.i;
break;
case 'M':
hw_metering = param->value.i;
break;
case 'r':
srate = param->value.ui;
jack_log("apparent rate = %d", srate);
break;
case 'p':
frames_per_interrupt = param->value.ui;
jack_log("frames per period = %d", frames_per_interrupt);
break;
case 'n':
user_nperiods = param->value.ui;
if (user_nperiods < 2) { /* enforce minimum value */
user_nperiods = 2;
}
break;
case 's':
soft_mode = param->value.i;
break;
case 'z':
if (dither_opt (param->value.c, &dither)) {
return NULL;
}
break;
case 'i':
user_capture_nchnls = param->value.ui;
break;
case 'o':
user_playback_nchnls = param->value.ui;
break;
case 'S':
shorts_first = param->value.i;
break;
case 'I':
systemic_input_latency = param->value.ui;
break;
case 'O':
systemic_output_latency = param->value.ui;
break;
case 'X':
midi_driver = strdup(param->value.str);
break;
}
}
/* duplex is the default */
if (!capture && !playback) {
capture = TRUE;
playback = TRUE;
}
g_alsa_driver = new Jack::JackAlsaDriver("system", "alsa_pcm", engine, table);
Jack::JackDriverClientInterface* threaded_driver = new Jack::JackThreadedDriver(g_alsa_driver);
// Special open for ALSA driver...
if (g_alsa_driver->Open(frames_per_interrupt, user_nperiods, srate, hw_monitoring, hw_metering, capture, playback, dither, soft_mode, monitor,
user_capture_nchnls, user_playback_nchnls, shorts_first, capture_pcm_name, playback_pcm_name,
systemic_input_latency, systemic_output_latency, midi_driver) == 0) {
return threaded_driver;
} else {
delete threaded_driver; // Delete the decorated driver
return NULL;
}
}
// Code to be used in alsa_driver.c
void ReadInput(jack_nframes_t orig_nframes, snd_pcm_sframes_t contiguous, snd_pcm_sframes_t nread)
{
g_alsa_driver->ReadInputAux(orig_nframes, contiguous, nread);
}
void MonitorInput()
{
g_alsa_driver->MonitorInputAux();
}
void ClearOutput()
{
g_alsa_driver->ClearOutputAux();
}
void WriteOutput(jack_nframes_t orig_nframes, snd_pcm_sframes_t contiguous, snd_pcm_sframes_t nwritten)
{
g_alsa_driver->WriteOutputAux(orig_nframes, contiguous, nwritten);
}
void SetTime(jack_time_t time)
{
g_alsa_driver->SetTimetAux(time);
}
int Restart()
{
int res;
if ((res = g_alsa_driver->Stop()) == 0) {
res = g_alsa_driver->Start();
}
return res;
}
#ifdef __cplusplus
}
#endif
jack_driver_param_constraint_desc_t
Definition: driver_interface.h:97
jack_constraint_enum_char_descriptor
Definition: driver_interface.h:87
Jack::JackThreadedDriver
The base class for threaded drivers using a "decorator" pattern. Threaded drivers are used with block...
Definition: JackThreadedDriver.h:34
Jack
Definition: JackAC3Encoder.cpp:30
Jack::JackLockedEngine
Locked Engine, access to methods is serialized using a mutex.
Definition: JackLockedEngine.h:78
jack_driver_param_value_t
Definition: driver_interface.h:64
Jack::JackPosixSemaphore
Inter process synchronization using POSIX semaphore.
Definition: JackPosixSemaphore.h:36
Jack::JackAlsaDriver
The ALSA driver.
Definition: JackAlsaDriver.h:36
jack_error
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:92
jack_constraint_enum_str_descriptor
Definition: driver_interface.h:92
_jack_latency_range::min
jack_nframes_t min
Definition: types.h:270
_jack_latency_range
Definition: types.h:265
_jack_latency_range::max
jack_nframes_t max
Definition: types.h:274
alsa_midi_t
Definition: alsa_midi.h:30
jack_driver_desc_filler_t
Definition: driver_interface.h:142
_alsa_driver
Definition: alsa_driver.h:57
Jack::JackDriverClientInterface
The base interface for drivers clients.
Definition: JackDriver.h:114
jack_driver_param_t
Definition: driver_interface.h:125
_JSList
Definition: linux/alsa/jslist.h:35
jack_log
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:108
jack_driver_desc_t
Definition: driver_interface.h:132