1 files changed, 230 insertions, 0 deletions
diff --git a/drumgizmo/output/alsa/alsa.cc b/drumgizmo/output/alsa/alsa.cc
new file mode 100644
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--- /dev/null
+++ b/drumgizmo/output/alsa/alsa.cc
@@ -0,0 +1,230 @@
+/* -*- 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 <stdlib.h>
+
+#include <audiotypes.h>
+#include <string>
+
+// Use the newer ALSA API
+#define ALSA_PCM_NEW_HW_PARAMS_API
+
+#include <asoundlib.h>
+
+#define T(x, msg) if(x < 0) { printf("%s failed: %s\n", msg, snd_strerror(x)); fflush(stdout); return false; }
+
+#define BUFSZ 40960
+
+class Alsa {
+public:
+  Alsa();
+  ~Alsa();
+  bool init(int channels, char *cnames[]);
+  void setParm(std::string parm, std::string value);
+  bool start();
+  void stop();
+  void pre(size_t size);
+  void run(int channel, sample_t* data, size_t size);
+  void post(size_t size);
+
+private:
+  snd_pcm_t *handle;
+  snd_pcm_hw_params_t *params;
+  sample_t *data;
+  size_t channels;
+
+  // Parameters
+  std::string device;
+  unsigned int srate;
+  snd_pcm_uframes_t frames;
+};
+
+Alsa::Alsa()
+{
+  handle = NULL;
+  data = NULL;
+
+  device = "default";
+  srate = 44100;
+  frames = 32;
+}
+
+Alsa::~Alsa()
+{
+  if(handle) snd_pcm_close(handle);
+  if(data) free(data);
+}
+
+bool Alsa::init(int channels, char *cnames[])
+{
+  int rc;
+
+  rc = snd_pcm_open(&handle, device.c_str(), SND_PCM_STREAM_PLAYBACK, 0);
+  T(rc, "snd_pcm_open");
+
+  this->channels = channels;
+  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");
+
+  data = (sample_t*)malloc(sizeof(sample_t) * BUFSZ * channels);
+
+  return true;
+}
+
+void Alsa::setParm(std::string parm, std::string value)
+{
+  if(parm == "dev") device = value;
+  if(parm == "frames") frames = atoi(value.c_str());
+  if(parm == "srate") srate = atoi(value.c_str());
+}
+
+bool Alsa::start()
+{
+  return true;
+}
+
+void Alsa::stop()
+{
+}
+
+void Alsa::pre(size_t size)
+{
+}
+
+void Alsa::run(int channel, sample_t* cdata, size_t csize)
+{
+  // Write channel data in interleaved buffer.
+  for(size_t i = 0; i < csize; i++) {
+    data[i * channels + channel] = cdata[i];
+  }
+}
+
+void Alsa::post(size_t size)
+{
+  // Write the interleaved buffer to the soundcard
+  snd_pcm_writei(handle, data, size);
+}
+
+extern "C" {
+  void *create()
+  {
+    return new Alsa();
+  }
+  
+  void destroy(void *h)
+  {
+    Alsa *alsa = (Alsa*)h;
+    delete alsa;
+  }
+
+  bool init(void *h, int cs, char *cnames[])
+  {
+    Alsa *alsa = (Alsa*)h;
+    return alsa->init(cs, cnames);
+  }
+
+  void setparm(void *h, const char *parm, const char *value)
+  {
+    Alsa *alsa = (Alsa*)h;
+    alsa->setParm(parm, value);
+  }
+
+  bool start(void *h)
+  {
+    Alsa *alsa = (Alsa*)h;
+    return alsa->start();
+  }
+
+  void stop(void *h)
+  {
+    Alsa *alsa = (Alsa*)h;
+    alsa->stop();
+  }
+
+  void pre(void *h, size_t s)
+  {
+    Alsa *alsa = (Alsa*)h;
+    alsa->pre(s);
+  }
+
+  void run(void *h, int ch, sample_t *data, size_t size)
+  {
+    Alsa *alsa = (Alsa*)h;
+    alsa->run(ch, data, size);
+  }
+
+  void post(void *h, size_t s)
+  {
+    Alsa *alsa = (Alsa*)h;
+    alsa->post(s);
+  }
+}
+
+#ifdef TEST_AUDIOOUTPUTENGINEALSA
+//Additional dependency files
+//deps:
+//Required cflags (autoconf vars may be used)
+//cflags:
+//Required link options (autoconf vars may be used)
+//libs:
+#include "test.h"
+
+TEST_BEGIN;
+
+// TODO: Put some testcode here (see test.h for usable macros).
+
+TEST_END;
+
+#endif/*TEST_AUDIOOUTPUTENGINEALSA*/