linux/sound/core/oss/pcm_plugin.c

/*
 *  PCM Plug-In shared (kernel/library) code
 *  Copyright (c) 1999 by Jaroslav Kysela <[email protected]>
 *  Copyright (c) 2000 by Abramo Bagnara <[email protected]>
 *
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2 of
 *   the License, or (at your option) any later version.
 *
 *   This program 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 Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */
  
#if 0
#define PLUGIN_DEBUG
#endif

#include <linux/slab.h>
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "pcm_plugin.h"

#define snd_pcm_plug_first(plug) …
#define snd_pcm_plug_last(plug) …

/*
 *  because some cards might have rates "very close", we ignore
 *  all "resampling" requests within +-5%
 */
static int rate_match(unsigned int src_rate, unsigned int dst_rate)
{ … }

static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
{ … }

int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
{ … }


snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
				       snd_pcm_uframes_t frames,
				       struct snd_pcm_plugin_channel **channels)
{ … }

int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
			 const char *name,
			 struct snd_pcm_plugin_format *src_format,
			 struct snd_pcm_plugin_format *dst_format,
			 size_t extra,
			 struct snd_pcm_plugin **ret)
{ … }

int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
{ … }

static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug,
					 snd_pcm_sframes_t frames,
					 bool check_size)
{ … }

static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug,
					 snd_pcm_sframes_t frames,
					 bool check_size)
{ … }

snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
{ … }

snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
{ … }

static int snd_pcm_plug_formats(const struct snd_mask *mask,
				snd_pcm_format_t format)
{ … }

static const snd_pcm_format_t preferred_formats[] = …;

snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
					   const struct snd_mask *format_mask)
{ … }

int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
				struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_params *slave_params)
{ … }

snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
					 char *buf,
					 snd_pcm_uframes_t count,
					 struct snd_pcm_plugin_channel **channels)
{ … }

snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *src_channels, snd_pcm_uframes_t size)
{ … }

snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *dst_channels_final, snd_pcm_uframes_t size)
{ … }

int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
			 size_t samples, snd_pcm_format_t format)
{ … }

int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
		      const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
		      size_t samples, snd_pcm_format_t format)
{ … }