MAJOR rewrite of the internals. New input/output 'plugin' system. Still a lot missing.

1 files changed, 194 insertions, 0 deletions

diff --git a/src/audiooutputenginealsa.cc b/src/audiooutputenginealsa.cc
new file mode 100644
index 0000000..635cf70
--- /dev/null
+++ b/src/audiooutputenginealsa.cc
@@ -0,0 +1,194 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            audiooutputenginealsa.cc
+ *
+ *  Thu Sep 16 11:22:52 CEST 2010
+ *  Copyright 2010 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 "audiooutputenginealsa.h"
+
+#include "drumgizmo.h"
+
+#include <string>
+#include <math.h>
+#include <sys/time.h>
+
+#define T(x, msg) if(x < 0) { printf("%s failed: %s\n", msg, snd_strerror(x)); fflush(stdout); return false; }
+#define T_(x, msg) if(x < 0) { printf("%s failed: %s\n", msg, snd_strerror(x)); fflush(stdout); return; }
+
+AudioOutputEngineAlsa::AudioOutputEngineAlsa()
+{
+  printf("AudioOutputEngineAlsa\n");
+	int rc;
+
+  std::string pcmname = "default";
+
+  rc = snd_pcm_open(&handle, pcmname.c_str(),
+                    SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
+  T_(rc, "snd_pcm_open");
+}
+
+AudioOutputEngineAlsa::~AudioOutputEngineAlsa()
+{
+  printf("~AudioOutputEngineAlsa\n");
+  if(handle) snd_pcm_close(handle);
+}
+
+bool AudioOutputEngineAlsa::init(Channels *channels)
+{
+  this->channels = channels;
+
+  if(!handle) {
+    printf("No handle!\n");
+    return false;
+  }
+
+  int rc;
+  unsigned int srate = 44100;
+  snd_pcm_uframes_t frames = 32;
+
+  // 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_MMAP_NONINTERLEAVED);
+  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->size());
+  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");
+
+  // SW Params:
+  /*
+    rc = snd_pcm_sw_params_current(pcm, sw);
+    rc = snd_pcm_sw_params_set_start_threshold(pcm, sw, ~0U);
+    rc = snd_pcm_sw_params_set_stop_threshold(pcm, sw, ~0U);
+    rc = snd_pcm_sw_params(pcm, sw);
+    rc = snd_pcm_hw_params_get_buffer_size(hw, &buffer_size);
+  */
+
+  channels_t nchannels;
+  rc = snd_pcm_hw_params_get_channels(params, &nchannels);
+  printf("channels: %d rc: %d\n", nchannels, rc);
+  T(rc, "snd_pcm_hw_params_get_channels");
+  if(nchannels != channels->size()) return false;
+
+  channel_t c = 0;
+  Channels::iterator i = channels->begin();
+  while(i != channels->end()) {
+    i->num = c;
+
+    i++;
+    c++;
+  }
+
+  return true;
+}
+
+#define MICRO 1000000
+void AudioOutputEngineAlsa::run(DrumGizmo *drumgizmo)
+{
+  int rc;
+
+  snd_pcm_uframes_t nframes;
+
+  while(drumgizmo->isRunning()) {
+    timeval tim;
+    gettimeofday(&tim, NULL);
+    useconds_t t1 = tim.tv_sec * MICRO + tim.tv_usec;
+
+    snd_pcm_uframes_t offset = 0;
+
+    //    unsigned int nchannels = 2;
+    //    rc = snd_pcm_hw_params_get_channels(params, &nchannels);
+    //    printf("channels: %d rc: %d\n", nchannels, rc);
+    //    T_(rc, "snd_pcm_hw_params_get_channels");
+    nframes = snd_pcm_avail_update(handle);
+    //    printf("%d\n", rc);
+    //    T_(rc, "snd_pcm_avail_update");
+
+    //  rc = snd_pcm_hw_params_get_buffer_size(params, &nframes);
+    //  T_(rc, "nd_pcm_hw_params_get_buffer_size");
+  
+    //    nframes = 960;
+
+    const snd_pcm_channel_area_t *areas;
+    rc = snd_pcm_mmap_begin(handle, &areas, &offset, &nframes);
+    T_(rc, "snd_pcm_mmap_begin");
+
+    drumgizmo->pre((size_t)nframes);
+
+    Channels::iterator i = channels->begin();
+    while(i != channels->end()) {
+      const snd_pcm_channel_area_t *a = &areas[i->num];
+      sample_t *p = (sample_t*)a->addr + offset;
+      memset(p, 0, nframes * sizeof(sample_t));
+      drumgizmo->getSamples(&(*i), p, (size_t)nframes);
+
+      i++;
+    }
+    drumgizmo->post((size_t)nframes);
+
+    switch(snd_pcm_state(handle)) {
+    case SND_PCM_STATE_PREPARED:
+      rc = snd_pcm_mmap_commit(handle, offset, nframes);
+      T_(rc, "snd_pcm_mmap_commit");
+      rc = snd_pcm_start(handle);
+      T_(rc, "snd_pcm_start");
+      break;
+    case SND_PCM_STATE_RUNNING:
+      rc = snd_pcm_mmap_commit(handle, offset, nframes);
+      T_(rc, "snd_pcm_mmap_commit");
+      break;
+    default:
+      break;
+    }
+
+    useconds_t msec = ((useconds_t)nframes * MICRO)/44100;
+
+    gettimeofday(&tim, NULL);
+    useconds_t t2 = tim.tv_sec * MICRO + tim.tv_usec;
+
+    struct timespec slp;
+    slp.tv_sec = 0;
+    slp.tv_nsec = (msec - (t2 - t1)) * 1000;
+
+    nanosleep(&slp, NULL);
+
+  }
+}