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authordeva <deva>2011-07-15 13:02:33 +0000
committerdeva <deva>2011-07-15 13:02:33 +0000
commitcd0e36773992e26985bdec1f7a5341f83fa3e521 (patch)
tree4710fb3f2465f4b464f5f6176261a67cfde2e46e /drumgizmo/output/alsa/alsa.cc
parente190d38057892b69246391841b234a368bc2b4ad (diff)
New input/output plugin architecture. New LV2 plugin.
Diffstat (limited to 'drumgizmo/output/alsa/alsa.cc')
-rw-r--r--drumgizmo/output/alsa/alsa.cc230
1 files changed, 230 insertions, 0 deletions
diff --git a/drumgizmo/output/alsa/alsa.cc b/drumgizmo/output/alsa/alsa.cc
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+++ b/drumgizmo/output/alsa/alsa.cc
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+/* -*- 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*/