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-rw-r--r--src/Makefile.am12
-rw-r--r--src/audioin.cc189
-rw-r--r--src/audioin.h81
-rw-r--r--src/audioout.cc87
-rw-r--r--src/audioout.h52
-rw-r--r--src/crosscomposer.cc18
6 files changed, 434 insertions, 5 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index d8c059e..c544e46 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,13 +2,17 @@ SUBDIRS =
bin_PROGRAMS = crosscomposer
-crosscomposer_LDADD =
-crosscomposer_CXXFLAGS =
+crosscomposer_LDADD = $(ALSA_LIBS) $(AO_LIBS)
+crosscomposer_CXXFLAGS = $(ALSA_CFLAGS) $(AO_CFLAGS)
crosscomposer_SOURCES = \
- crosscomposer.cc
+ crosscomposer.cc \
+ audioin.cc \
+ audioout.cc
-EXTRA_DIST =
+EXTRA_DIST = \
+ audioin.h \
+ audioout.h
################
# Test Section #
diff --git a/src/audioin.cc b/src/audioin.cc
new file mode 100644
index 0000000..3792ae2
--- /dev/null
+++ b/src/audioin.cc
@@ -0,0 +1,189 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * audioin.cc
+ *
+ * Wed Sep 30 11:36:18 CEST 2009
+ * Copyright 2011 Bent Bisballe Nyeng
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This file is part of libaudioin.
+ *
+ * libaudioin 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.
+ *
+ * libaudioin 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 libaudioin; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include "audioin.h"
+
+AudioIn::AudioIn(std::string device, std::string mixer_interface,
+ unsigned int srate, int ch)
+{
+ frames = 940;
+
+ elem = NULL;
+ mixhnd = NULL;
+
+ int rc;
+
+ // Open PCM device for recording (capture).
+ rc = snd_pcm_open(&handle, device.c_str(), SND_PCM_STREAM_CAPTURE, 0);
+ if (rc < 0) throw CouldNotOpenPCMDevice();
+
+ // Allocate a hardware parameters object.
+ snd_pcm_hw_params_alloca(&params);
+
+ // Fill it in with default values.
+ rc = snd_pcm_hw_params_any(handle, params);
+ if (rc < 0) throw CouldNotInitialiseParams();
+
+ // Set the desired hardware parameters.
+
+ // Interleaved mode
+ rc = snd_pcm_hw_params_set_access(handle, params,
+ SND_PCM_ACCESS_RW_INTERLEAVED);
+ if (rc < 0) throw CouldNotSetAccessMode();
+
+ // Signed 16-bit little-endian format
+ rc = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_FLOAT);
+ if (rc < 0) throw CouldNotSetFormat();
+
+ // Set channels (stereo/mono)
+ rc = snd_pcm_hw_params_set_channels(handle, params, ch);
+ channels = ch;
+ if (rc < 0) throw CouldNotSetChannelNumber();
+
+ // Set sampling rate
+ unsigned int val = srate;
+ snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir);
+ printf("srate: %d\n", val);
+ // if(val != srate) throw UnableToSetSampleRate();
+
+ // NOTE: Setting period size to 32 frames will force use of lowest possible value.
+ rc = snd_pcm_hw_params_set_period_size_near(handle, params, &frames, &dir);
+ if(rc < 0) throw UnableToSetPeriodSize();
+
+ // Write the parameters to the driver
+ rc = snd_pcm_hw_params(handle, params);
+ if (rc < 0) throw UnableToSetHWParams();
+
+ mixhnd = NULL;
+ /*
+ //
+ // Set up mixer
+ //
+ snd_mixer_selem_id_t *mixer;
+
+ // Open mixer device
+ if(snd_mixer_open(&mixhnd, 0) != 0) throw MixerInitilisationFailed();
+
+ if(snd_mixer_attach(mixhnd, device.c_str()) != 0)
+ throw MixerInitilisationFailed();
+
+ if(snd_mixer_selem_register(mixhnd, NULL, NULL) < 0)
+ throw MixerInitilisationFailed();
+
+ if(snd_mixer_load(mixhnd) < 0)
+ throw MixerInitilisationFailed();
+
+ // Obtain mixer element
+ snd_mixer_selem_id_alloca(&mixer);
+ if(mixer == NULL) throw MixerInitilisationFailed();
+ snd_mixer_selem_id_set_name(mixer, mixer_interface.c_str());
+
+ elem = snd_mixer_find_selem(mixhnd, mixer);
+ if(elem == NULL) throw MixerInitilisationFailed();
+
+ if(snd_mixer_selem_get_capture_volume_range(elem, &lvl_min, &lvl_max) != 0)
+ throw MixerInitilisationFailed();
+
+ if(snd_mixer_selem_set_capture_switch(elem,
+ SND_MIXER_SCHN_FRONT_LEFT, 1) != 0)
+ throw MixerInitilisationFailed();
+
+ if(snd_mixer_selem_set_capture_switch(elem,
+ SND_MIXER_SCHN_FRONT_RIGHT, 1) != 0)
+ throw MixerInitilisationFailed();
+
+
+ // Obtain mixer enumeration element "Input Source" and set it to 2 (line).
+ snd_mixer_selem_id_set_name(mixer, "Input Source");
+
+ snd_mixer_elem_t *iselem = snd_mixer_find_selem(mixhnd, mixer);
+ if(iselem == NULL) return;
+
+ if(snd_mixer_selem_is_enumerated(iselem)) {
+ // Set to line-in
+ snd_mixer_selem_set_enum_item(iselem, SND_MIXER_SCHN_MONO, 2);
+ }
+ */
+}
+
+AudioIn::~AudioIn()
+{
+ if(handle) {
+ snd_pcm_drain(handle);
+ snd_pcm_close(handle);
+ }
+ if(mixhnd) snd_mixer_close(mixhnd);
+}
+
+size_t AudioIn::read(sample_t *buf, size_t size)
+{
+ int rc;
+
+ if(size < frames * channels) {
+ throw PcmBufferTooSmall();
+ }
+
+ rc = snd_pcm_readi(handle, buf, frames);
+ if (rc == -EPIPE) {
+ // EPIPE means overrun
+ snd_pcm_prepare(handle);
+ throw OverRun();
+ return 0;
+ } else if (rc < 0) {
+ throw ReadError();
+ } else if (rc != (int)frames) {
+ throw ShortRead();
+ }
+
+ return rc * channels;
+}
+
+int AudioIn::set_level(unsigned int channel, float level)
+{
+
+ if(!elem) throw MixerNotInitialised();
+
+ if(level > 1.0 || level < 0.0) throw InvalidMixerLevel();
+
+ long lvl = ((lvl_max - lvl_min) * level) + lvl_min;
+
+ snd_mixer_selem_channel_id_t ch;
+ switch(channel) {
+ case 0:
+ ch = SND_MIXER_SCHN_FRONT_LEFT;
+ break;
+ case 1:
+ ch = SND_MIXER_SCHN_FRONT_RIGHT;
+ break;
+ default:
+ throw IllegalChannelNumber();
+ break;
+ }
+ if(snd_mixer_selem_set_capture_volume(elem, ch, lvl) != 0) {
+ throw CouldNotSetMixerLevel();
+ }
+ return 0;
+}
diff --git a/src/audioin.h b/src/audioin.h
new file mode 100644
index 0000000..99d2651
--- /dev/null
+++ b/src/audioin.h
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * audioin.h
+ *
+ * Wed Sep 30 11:36:18 CEST 2009
+ * Copyright 2011 Bent Bisballe Nyeng
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This file is part of libaudioin.
+ *
+ * libaudioin 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.
+ *
+ * libaudioin 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 libaudioin; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#ifndef __LIBAUDIOIN_AUDIOIN_H__
+#define __LIBAUDIOIN_AUDIOIN_H__
+
+// Use the newer ALSA API
+#define ALSA_PCM_NEW_HW_PARAMS_API
+
+#include <asoundlib.h>
+#include <exception>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string>
+
+typedef float sample_t;
+
+class AudioIn {
+public:
+ class CouldNotOpenPCMDevice : public std::exception {};
+ class UnableToSetHWParams : public std::exception {};
+ class PcmBufferTooSmall : public std::exception {};
+ class OverRun : public std::exception {};
+ class ReadError : public std::exception {};
+ class ShortRead : public std::exception {};
+ class CouldNotInitialiseParams : public std::exception {};
+ class CouldNotSetAccessMode : public std::exception {};
+ class CouldNotSetFormat : public std::exception {};
+ class CouldNotSetChannelNumber : public std::exception {};
+ class UnableToSetSampleRate : public std::exception {};
+ class UnableToSetPeriodSize : public std::exception {};
+ class MixerInitilisationFailed : public std::exception {};
+ class MixerNotInitialised : public std::exception {};
+ class InvalidMixerLevel : public std::exception {};
+ class IllegalChannelNumber : public std::exception {};
+ class CouldNotSetMixerLevel : public std::exception {};
+
+ AudioIn(std::string device, std::string mixer, unsigned int srate, int ch);
+ ~AudioIn();
+
+ size_t read(sample_t *buf, size_t size);
+
+ int set_level(unsigned int channel, float level);
+
+private:
+ int channels;
+ snd_pcm_t *handle;
+ snd_pcm_hw_params_t *params;
+ unsigned int val;
+ int dir;
+ snd_pcm_uframes_t frames;
+
+ snd_mixer_t *mixhnd;
+ snd_mixer_elem_t *elem;
+ long lvl_min, lvl_max;
+};
+
+#endif/*__LIBAUDIOIN_AUDIOIN_H__*/
diff --git a/src/audioout.cc b/src/audioout.cc
new file mode 100644
index 0000000..0495a2c
--- /dev/null
+++ b/src/audioout.cc
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * audiooutputenginedummy.cc
+ *
+ * Sat Apr 30 21:12:02 CEST 2011
+ * Copyright 2011 Bent Bisballe Nyeng
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo 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.
+ *
+ * DrumGizmo 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 DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include "audioout.h"
+
+
+#define T(x, msg) if(x < 0) { printf("%s failed: %s\n", msg, snd_strerror(x)); fflush(stdout); }
+
+#define BUFSZ 40960
+
+AudioOut::AudioOut(std::string device, unsigned int srate, int channels)
+{
+ handle = NULL;
+
+ snd_pcm_uframes_t frames = 940;
+
+ int rc;
+
+ rc = snd_pcm_open(&handle, device.c_str(), SND_PCM_STREAM_PLAYBACK, 0);
+ T(rc, "snd_pcm_open");
+
+ if(!handle) {
+ printf("No handle!\n");
+ // return false;
+ }
+
+ // Allocate a hardware parameters object.
+ snd_pcm_hw_params_alloca(&params);
+ // if(rc < 0) return false;
+
+ // Fill it in with default values.
+ rc = snd_pcm_hw_params_any(handle, params);
+ T(rc, "snd_pcm_hw_params_any");
+
+ rc = snd_pcm_hw_params_set_access(handle, params,
+ SND_PCM_ACCESS_RW_INTERLEAVED);
+ T(rc, "snd_pcm_hw_params_set_access");
+
+ rc = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_FLOAT);
+ T(rc, "snd_pcm_hw_params_set_format");
+
+ rc = snd_pcm_hw_params_set_channels(handle, params, channels);
+ T(rc, "snd_pcm_hw_params_set_channels");
+
+ rc = snd_pcm_hw_params_set_rate_near(handle, params, &srate, 0);
+ T(rc, "snd_pcm_hw_params_set_rate_near");
+
+ rc = snd_pcm_hw_params_set_period_size_near(handle, params, &frames, 0);
+ T(rc, "snd_pcm_hw_params_set_period_size_near");
+
+ rc = snd_pcm_hw_params(handle, params);
+ T(rc, "snd_pcm_hw_params");
+}
+
+AudioOut::~AudioOut()
+{
+ if(handle) snd_pcm_close(handle);
+}
+
+void AudioOut::write(sample_t *samples, size_t size)
+{
+ // Write the interleaved buffer to the soundcard
+ snd_pcm_writei(handle, samples, size);
+}
diff --git a/src/audioout.h b/src/audioout.h
new file mode 100644
index 0000000..e020b0b
--- /dev/null
+++ b/src/audioout.h
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * player.h
+ *
+ * Sun May 17 08:19:51 CEST 2009
+ * Copyright 2009 Bent Bisballe Nyeng
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This file is part of AudioChain.
+ *
+ * AudioChain 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.
+ *
+ * AudioChain 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 AudioChain; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#ifndef __AUDIOCHAIN_PLAYER_H__
+#define __AUDIOCHAIN_PLAYER_H__
+
+#include <stdlib.h>
+
+#include <string>
+
+// Use the newer ALSA API
+#define ALSA_PCM_NEW_HW_PARAMS_API
+
+#include <asoundlib.h>
+
+typedef float sample_t;
+
+class AudioOut {
+public:
+ AudioOut(std::string device, unsigned int srate, int channels);
+ ~AudioOut();
+ void write(sample_t *samples, size_t size);
+
+private:
+ snd_pcm_t *handle;
+ snd_pcm_hw_params_t *params;
+};
+
+#endif/*__AUDIOCHAIN_PLAYER_H__*/
diff --git a/src/crosscomposer.cc b/src/crosscomposer.cc
index 049d57f..c8992ff 100644
--- a/src/crosscomposer.cc
+++ b/src/crosscomposer.cc
@@ -25,8 +25,24 @@
* along with Cross Composer; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
+#include <stdio.h>
+#include "audioin.h"
+#include "audioout.h"
-int main()
+int main(int argc, char *argv[])
{
+ AudioIn in("default", "Capture", 44101, 1);
+ AudioOut out("default", 44101, 1);
+
+ sample_t samples[940];
+ int i = 50;
+ while(i--) {
+ int sz = in.read(samples, sizeof(samples));
+ out.write(samples, sz);
+ printf("."); fflush(stdout);
+ }
+ printf("!\n");
+
+ return 0;
}
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