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-rw-r--r--plugins/eg-amp.lv2/amp.c225
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diff --git a/plugins/eg-amp.lv2/amp.c b/plugins/eg-amp.lv2/amp.c
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-/*
- Copyright 2006-2011 David Robillard <d@drobilla.net>
- Copyright 2006 Steve Harris <steve@plugin.org.uk>
-
- Permission to use, copy, modify, and/or distribute this software for any
- purpose with or without fee is hereby granted, provided that the above
- copyright notice and this permission notice appear in all copies.
-
- THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-*/
-
-/** Include standard C headers */
-#include <math.h>
-#include <stdlib.h>
-
-/**
- LV2 headers are based on the URI of the specification they come from, so a
- consistent convention can be used even for unofficial extensions. The URI
- of the core LV2 specification is <http://lv2plug.in/ns/lv2core>, by
- replacing `http:/` with `lv2` any header in the specification bundle can be
- included, in this case `lv2.h`.
-*/
-#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
-
-/**
- The URI is the identifier for a plugin, and how the host associates this
- implementation in code with its description in data. In this plugin it is
- only used once in the code, but defining the plugin URI at the top of the
- file is a good convention to follow. If this URI does not match that used
- in the data files, the host will fail to load the plugin.
-*/
-#define AMP_URI "http://lv2plug.in/plugins/eg-amp"
-
-/**
- In code, ports are referred to by index. An enumeration of port indices
- should be defined for readability.
-*/
-typedef enum {
- AMP_GAIN = 0,
- AMP_INPUT = 1,
- AMP_OUTPUT = 2
-} PortIndex;
-
-/**
- Every plugin defines a private structure for the plugin instance. All data
- associated with a plugin instance is stored here, and is available to
- every instance method. In this simple plugin, only port buffers need to be
- stored, since there is no additional instance data. */
-typedef struct {
- // Port buffers
- const float* gain;
- const float* input;
- float* output;
-} Amp;
-
-/**
- The instantiate() function is called by the host to create a new plugin
- instance. The host passes the plugin descriptor, sample rate, and bundle
- path for plugins that need to load additional resources (e.g. waveforms).
- The features parameter contains host-provided features defined in LV2
- extensions, but this simple plugin does not use any.
-
- This function is in the ``instantiation'' threading class, so no other
- methods on this instance will be called concurrently with it.
-*/
-static LV2_Handle
-instantiate(const LV2_Descriptor* descriptor,
- double rate,
- const char* bundle_path,
- const LV2_Feature* const* features)
-{
- Amp* amp = (Amp*)malloc(sizeof(Amp));
-
- return (LV2_Handle)amp;
-}
-
-/**
- The connect_port() method is called by the host to connect a particular port
- to a buffer. The plugin must store the data location, but data may not be
- accessed except in run().
-
- This method is in the ``audio'' threading class, and is called in the same
- context as run().
-*/
-static void
-connect_port(LV2_Handle instance,
- uint32_t port,
- void* data)
-{
- Amp* amp = (Amp*)instance;
-
- switch ((PortIndex)port) {
- case AMP_GAIN:
- amp->gain = (const float*)data;
- break;
- case AMP_INPUT:
- amp->input = (const float*)data;
- break;
- case AMP_OUTPUT:
- amp->output = (float*)data;
- break;
- }
-}
-
-/**
- The activate() method is called by the host to initialise and prepare the
- plugin instance for running. The plugin must reset all internal state
- except for buffer locations set by connect_port(). Since this plugin has
- no other internal state, this method does nothing.
-
- This method is in the ``instantiation'' threading class, so no other
- methods on this instance will be called concurrently with it.
-*/
-static void
-activate(LV2_Handle instance)
-{
-}
-
-/** Define a macro for converting a gain in dB to a coefficient */
-#define DB_CO(g) ((g) > -90.0f ? powf(10.0f, (g) * 0.05f) : 0.0f)
-
-/** Process a block of audio (audio thread, must be RT safe). */
-static void
-run(LV2_Handle instance, uint32_t n_samples)
-{
- const Amp* amp = (const Amp*)instance;
-
- const float gain = *(amp->gain);
- const float* const input = amp->input;
- float* const output = amp->output;
-
- const float coef = DB_CO(gain);
-
- for (uint32_t pos = 0; pos < n_samples; pos++) {
- output[pos] = input[pos] * coef;
- }
-}
-
-/**
- The deactivate() method is the counterpart to activate() called by the host
- after running the plugin. It indicates that the host will not call run()
- again until another call to activate() and is mainly useful for more
- advanced plugins with ``live'' characteristics such as those with auxiliary
- processing threads. As with activate(), this plugin has no use for this
- information so this method does nothing.
-
- This method is in the ``instantiation'' threading class, so no other
- methods on this instance will be called concurrently with it.
-*/
-static void
-deactivate(LV2_Handle instance)
-{
-}
-
-/**
- Destroy a plugin instance (counterpart to instantiate()).
-
- This method is in the ``instantiation'' threading class, so no other
- methods on this instance will be called concurrently with it.
-*/
-static void
-cleanup(LV2_Handle instance)
-{
- free(instance);
-}
-
-/**
- The extension_data function returns any extension data supported by the
- plugin. Note that this is not an instance method, but a function on the
- plugin descriptor. It is usually used by plugins to implement additional
- interfaces. This plugin does not have any extension data, so this function
- returns NULL.
-
- This method is in the ``discovery'' threading class, so no other functions
- or methods in this plugin library will be called concurrently with it.
-*/
-static const void*
-extension_data(const char* uri)
-{
- return NULL;
-}
-
-/**
- Define the LV2_Descriptor for this plugin. It is best to define descriptors
- statically to avoid leaking memory and non-portable shared library
- constructors and destructors to clean up properly.
-*/
-static const LV2_Descriptor descriptor = {
- AMP_URI,
- instantiate,
- connect_port,
- activate,
- run,
- deactivate,
- cleanup,
- extension_data
-};
-
-/**
- The lv2_descriptor() function is the entry point to the plugin library. The
- host will load the library and call this function repeatedly with increasing
- indices to find all the plugins defined in the library. The index is not an
- indentifier, the URI of the returned descriptor is used to determine the
- identify of the plugin.
-
- This method is in the ``discovery'' threading class, so no other functions
- or methods in this plugin library will be called concurrently with it.
-*/
-LV2_SYMBOL_EXPORT
-const LV2_Descriptor*
-lv2_descriptor(uint32_t index)
-{
- switch (index) {
- case 0:
- return &descriptor;
- default:
- return NULL;
- }
-}