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https://github.com/alsa-project/alsa-lib.git
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155 lines
6.5 KiB
C
155 lines
6.5 KiB
C
/*
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* PCM - Common plugin code
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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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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "pcm_generic.h"
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typedef snd_pcm_uframes_t (*snd_pcm_slave_xfer_areas_func_t)
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(snd_pcm_t *pcm,
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const snd_pcm_channel_area_t *areas,
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snd_pcm_uframes_t offset,
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snd_pcm_uframes_t size,
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const snd_pcm_channel_area_t *slave_areas,
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snd_pcm_uframes_t slave_offset,
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snd_pcm_uframes_t *slave_sizep);
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typedef snd_pcm_sframes_t (*snd_pcm_slave_xfer_areas_undo_func_t)
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(snd_pcm_t *pcm,
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const snd_pcm_channel_area_t *res_areas, /* result areas */
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snd_pcm_uframes_t res_offset, /* offset of result areas */
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snd_pcm_uframes_t res_size, /* size of result areas */
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snd_pcm_uframes_t slave_undo_size);
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typedef struct {
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snd_pcm_generic_t gen;
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snd_pcm_slave_xfer_areas_func_t read;
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snd_pcm_slave_xfer_areas_func_t write;
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snd_pcm_slave_xfer_areas_undo_func_t undo_read;
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snd_pcm_slave_xfer_areas_undo_func_t undo_write;
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int (*init)(snd_pcm_t *pcm);
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snd_pcm_uframes_t appl_ptr, hw_ptr;
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} snd_pcm_plugin_t;
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/* make local functions really local */
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#define snd_pcm_plugin_init \
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snd1_pcm_plugin_init
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#define snd_pcm_plugin_may_wait_for_avail_min \
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snd1_pcm_plugin_may_wait_for_avail_min
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#define snd_pcm_plugin_fast_ops \
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snd1_pcm_plugin_fast_ops
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#define snd_pcm_plugin_undo_read_generic \
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snd1_pcm_plugin_undo_read_generic
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#define snd_pcm_plugin_undo_write_generic \
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snd1_pcm_plugin_undo_write_generic
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#define snd_pcm_plugin_rewind \
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snd1_pcm_plugin_rewind
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#define snd_pcm_plugin_forward \
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snd1_pcm_plugin_forward
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void snd_pcm_plugin_init(snd_pcm_plugin_t *plugin);
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snd_pcm_sframes_t snd_pcm_plugin_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
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snd_pcm_sframes_t snd_pcm_plugin_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
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int snd_pcm_plugin_may_wait_for_avail_min(snd_pcm_t *pcm, snd_pcm_uframes_t avail);
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extern const snd_pcm_fast_ops_t snd_pcm_plugin_fast_ops;
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snd_pcm_sframes_t snd_pcm_plugin_undo_read_generic
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(snd_pcm_t *pcm,
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const snd_pcm_channel_area_t *res_areas, /* result areas */
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snd_pcm_uframes_t res_offset, /* offset of result areas */
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snd_pcm_uframes_t res_size, /* size of result areas */
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snd_pcm_uframes_t slave_undo_size);
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snd_pcm_sframes_t snd_pcm_plugin_undo_write_generic
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(snd_pcm_t *pcm,
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const snd_pcm_channel_area_t *res_areas, /* result areas */
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snd_pcm_uframes_t res_offset, /* offset of result areas */
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snd_pcm_uframes_t res_size, /* size of result areas */
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snd_pcm_uframes_t slave_undo_size);
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/* make local functions really local */
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#define snd_pcm_linear_get_index snd1_pcm_linear_get_index
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#define snd_pcm_linear_put_index snd1_pcm_linear_put_index
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#define snd_pcm_linear_convert_index snd1_pcm_linear_convert_index
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#define snd_pcm_linear_convert snd1_pcm_linear_convert
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#define snd_pcm_linear_getput snd1_pcm_linear_getput
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#define snd_pcm_alaw_decode snd1_pcm_alaw_decode
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#define snd_pcm_alaw_encode snd1_pcm_alaw_encode
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#define snd_pcm_mulaw_decode snd1_pcm_mulaw_decode
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#define snd_pcm_mulaw_encode snd1_pcm_mulaw_encode
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#define snd_pcm_adpcm_decode snd1_pcm_adpcm_decode
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#define snd_pcm_adpcm_encode snd1_pcm_adpcm_encode
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int snd_pcm_linear_get_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format);
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int snd_pcm_linear_put_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format);
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int snd_pcm_linear_convert_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format);
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void snd_pcm_linear_convert(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
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const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int convidx);
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void snd_pcm_linear_getput(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
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const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int get_idx, unsigned int put_idx);
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void snd_pcm_alaw_decode(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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snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int putidx);
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void snd_pcm_alaw_encode(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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snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int getidx);
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void snd_pcm_mulaw_decode(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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snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int putidx);
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void snd_pcm_mulaw_encode(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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snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int getidx);
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typedef struct _snd_pcm_adpcm_state {
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int pred_val; /* Calculated predicted value */
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int step_idx; /* Previous StepSize lookup index */
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} snd_pcm_adpcm_state_t;
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void snd_pcm_adpcm_decode(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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snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int putidx,
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snd_pcm_adpcm_state_t *states);
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void snd_pcm_adpcm_encode(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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snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int getidx,
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snd_pcm_adpcm_state_t *states);
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