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Added initial comments for PCM plugins
This commit is contained in:
Jaroslav Kysela
parent
6ead410b11
commit
a24b602f28
11 changed files with 796 additions and 28 deletions
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@ -1,5 +1,12 @@
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/**
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* \file pcm/pcm_route.c
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* \ingroup PCM_Plugins
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* \brief PCM Route & Volume Plugin Interface
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* \author Abramo Bagnara <abramo@alsa-project.org>
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* \date 2000-2001
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*/
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/*
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* PCM - Linear conversion
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* PCM - Route & Volume Plugin
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* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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*
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*
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@ -29,6 +36,8 @@
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const char *_snd_module_pcm_route = "";
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#endif
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#ifndef DOC_HIDDEN
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/* The best possible hack to support missing optimization in gcc 2.7.2.3 */
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#if SND_PCM_PLUGIN_ROUTE_RESOLUTION & (SND_PCM_PLUGIN_ROUTE_RESOLUTION - 1) != 0
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#define div(a) a /= SND_PCM_PLUGIN_ROUTE_RESOLUTION
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@ -91,6 +100,7 @@ typedef struct {
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snd_pcm_route_params_t params;
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} snd_pcm_route_t;
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#endif /* DOC_HIDDEN */
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static void snd_pcm_route_convert1_zero(const snd_pcm_channel_area_t *dst_area,
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snd_pcm_uframes_t dst_offset,
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@ -103,6 +113,8 @@ static void snd_pcm_route_convert1_zero(const snd_pcm_channel_area_t *dst_area,
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snd_pcm_area_silence(dst_area, dst_offset, frames, params->dst_sfmt);
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}
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#ifndef DOC_HIDDEN
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static void snd_pcm_route_convert1_one(const snd_pcm_channel_area_t *dst_area,
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snd_pcm_uframes_t dst_offset,
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const snd_pcm_channel_area_t *src_areas,
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@ -381,6 +393,8 @@ static void snd_pcm_route_convert1_many(const snd_pcm_channel_area_t *dst_area,
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}
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}
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#endif /* DOC_HIDDEN */
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static void snd_pcm_route_convert(const snd_pcm_channel_area_t *dst_areas,
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snd_pcm_uframes_t dst_offset,
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const snd_pcm_channel_area_t *src_areas,
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@ -646,7 +660,7 @@ static void snd_pcm_route_dump(snd_pcm_t *pcm, snd_output_t *out)
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snd_pcm_dump(route->plug.slave, out);
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}
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snd_pcm_ops_t snd_pcm_route_ops = {
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static snd_pcm_ops_t snd_pcm_route_ops = {
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close: snd_pcm_route_close,
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info: snd_pcm_plugin_info,
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hw_refine: snd_pcm_route_hw_refine,
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@ -732,7 +746,23 @@ static int route_load_ttable(snd_pcm_route_params_t *params, snd_pcm_stream_t st
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return 0;
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}
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/**
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* \brief Creates a new Route & Volume PCM
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* \param pcmp Returns created PCM handle
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* \param name Name of PCM
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* \param sformat Slave format
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* \param schannels Slave channels
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* \param ttable Attenuation table
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* \param tt_ssize Attenuation table - slave size
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* \param tt_cused Attenuation table - client used count
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* \param tt_sused Attenuation table - slave used count
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* \param slave Slave PCM handle
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* \param close_slave When set, the slave PCM handle is closed with copy PCM
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* \retval zero on success otherwise a negative error code
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* \warning Using of this function might be dangerous in the sense
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* of compatibility reasons. The prototype might be freely
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* changed in future.
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*/
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int snd_pcm_route_open(snd_pcm_t **pcmp, const char *name,
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snd_pcm_format_t sformat, int schannels,
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snd_pcm_route_ttable_entry_t *ttable,
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@ -779,6 +809,13 @@ int snd_pcm_route_open(snd_pcm_t **pcmp, const char *name,
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return 0;
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}
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/**
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* \brief Determine route matrix sizes
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* \param tt Configuration root describing route matrix
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* \param tt_csize Returned client size in elements
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* \param tt_ssize Returned slave size in elements
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* \retval zero on success otherwise a negative error code
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*/
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int snd_pcm_route_determine_ttable(snd_config_t *tt,
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unsigned int *tt_csize,
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unsigned int *tt_ssize)
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@ -828,7 +865,17 @@ int snd_pcm_route_determine_ttable(snd_config_t *tt,
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return 0;
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}
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/* this functions is used from pcm_plug.c */
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/**
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* \brief Load route matrix
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* \param tt Configuration root describing route matrix
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* \param ttable Returned route matrix
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* \param tt_csize Client size in elements
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* \param tt_ssize Slave size in elements
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* \param tt_cused Used client elements
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* \param tt_sused Used slave elements
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* \param schannels Slave channels
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* \retval zero on success otherwise a negative error code
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*/
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int snd_pcm_route_load_ttable(snd_config_t *tt, snd_pcm_route_ttable_entry_t *ttable,
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unsigned int tt_csize, unsigned int tt_ssize,
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unsigned int *tt_cused, unsigned int *tt_sused,
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@ -892,6 +939,48 @@ int snd_pcm_route_load_ttable(snd_config_t *tt, snd_pcm_route_ttable_entry_t *tt
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return 0;
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}
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/*! \page pcm_plugins
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\section pcm_plugins_route Plugin: Route & Volume
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This plugin converts channels and applies volume during the conversion.
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The format and rate must match for both of them.
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\code
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pcm.name {
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type route # Route & Volume conversion PCM
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slave STR # Slave name
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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}
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}
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\endcode
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\subsection pcm_plugins_route_funcref Function reference
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<UL>
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<LI>snd_pcm_route_open()
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<LI>_snd_pcm_route_open()
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</UL>
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*/
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/**
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* \brief Creates a new Route & Volume PCM
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* \param pcmp Returns created PCM handle
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* \param name Name of PCM
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* \param root Root configuration node
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* \param conf Configuration node with Route & Volume PCM description
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* \param stream Stream type
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* \param mode Stream mode
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* \retval zero on success otherwise a negative error code
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* \warning Using of this function might be dangerous in the sense
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* of compatibility reasons. The prototype might be freely
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* changed in future.
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*/
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int _snd_pcm_route_open(snd_pcm_t **pcmp, const char *name,
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snd_config_t *root, snd_config_t *conf,
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snd_pcm_stream_t stream, int mode)
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@ -981,4 +1070,6 @@ int _snd_pcm_route_open(snd_pcm_t **pcmp, const char *name,
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snd_pcm_close(spcm);
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return err;
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}
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#ifndef DOC_HIDDEN
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SND_DLSYM_BUILD_VERSION(_snd_pcm_route_open, SND_PCM_DLSYM_VERSION);
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#endif
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