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Diffstat (limited to 'plugins/eg01-amp.lv2/amp.c')
| -rw-r--r-- | plugins/eg01-amp.lv2/amp.c | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/plugins/eg01-amp.lv2/amp.c b/plugins/eg01-amp.lv2/amp.c deleted file mode 100644 index eea9861..0000000 --- a/plugins/eg01-amp.lv2/amp.c +++ /dev/null @@ -1,229 +0,0 @@ -/* - 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) - -/** - The `run()` method is the main process function of the plugin. It processes - a block of audio in the audio context. Since this plugin is - `lv2:hardRTCapable`, `run()` must be real-time safe, so blocking (e.g. with - a mutex) or memory allocation are not allowed. -*/ -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()`, and is 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; -} - -/** - Every plugin must define an `LV2_Descriptor`. 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; - } -} |