summaryrefslogtreecommitdiff
path: root/src/audiooutputenginealsa.cc
diff options
context:
space:
mode:
authordeva <deva>2011-03-01 19:19:02 +0000
committerdeva <deva>2011-03-01 19:19:02 +0000
commite190d38057892b69246391841b234a368bc2b4ad (patch)
tree34f946bc1c3b86997d4cd45e63c433ef07b36486 /src/audiooutputenginealsa.cc
parentc393edc920f8ee126d1bced3500b6bc1ecf86f83 (diff)
MAJOR rewrite of the internals. New input/output 'plugin' system. Still a lot missing.
Diffstat (limited to 'src/audiooutputenginealsa.cc')
-rw-r--r--src/audiooutputenginealsa.cc194
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);
+
+ }
+}