/* * PCM - Common plugin code * Copyright (c) 2000 by Abramo Bagnara * * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ #include "pcm_generic.h" typedef snd_pcm_uframes_t (*snd_pcm_slave_xfer_areas_func_t) (snd_pcm_t *pcm, const snd_pcm_channel_area_t *areas, snd_pcm_uframes_t offset, snd_pcm_uframes_t size, const snd_pcm_channel_area_t *slave_areas, snd_pcm_uframes_t slave_offset, snd_pcm_uframes_t *slave_sizep); typedef snd_pcm_sframes_t (*snd_pcm_slave_xfer_areas_undo_func_t) (snd_pcm_t *pcm, const snd_pcm_channel_area_t *res_areas, /* result areas */ snd_pcm_uframes_t res_offset, /* offset of result areas */ snd_pcm_uframes_t res_size, /* size of result areas */ snd_pcm_uframes_t slave_undo_size); typedef struct { snd_pcm_generic_t gen; snd_pcm_slave_xfer_areas_func_t read; snd_pcm_slave_xfer_areas_func_t write; snd_pcm_slave_xfer_areas_undo_func_t undo_read; snd_pcm_slave_xfer_areas_undo_func_t undo_write; int (*init)(snd_pcm_t *pcm); snd_pcm_uframes_t appl_ptr, hw_ptr; } snd_pcm_plugin_t; /* make local functions really local */ #define snd_pcm_plugin_init \ snd1_pcm_plugin_init #define snd_pcm_plugin_may_wait_for_avail_min \ snd1_pcm_plugin_may_wait_for_avail_min #define snd_pcm_plugin_fast_ops \ snd1_pcm_plugin_fast_ops #define snd_pcm_plugin_undo_read_generic \ snd1_pcm_plugin_undo_read_generic #define snd_pcm_plugin_undo_write_generic \ snd1_pcm_plugin_undo_write_generic #define snd_pcm_plugin_rewind \ snd1_pcm_plugin_rewind #define snd_pcm_plugin_forward \ snd1_pcm_plugin_forward void snd_pcm_plugin_init(snd_pcm_plugin_t *plugin); snd_pcm_sframes_t snd_pcm_plugin_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames); snd_pcm_sframes_t snd_pcm_plugin_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames); int snd_pcm_plugin_may_wait_for_avail_min(snd_pcm_t *pcm, snd_pcm_uframes_t avail); extern const snd_pcm_fast_ops_t snd_pcm_plugin_fast_ops; snd_pcm_sframes_t snd_pcm_plugin_undo_read_generic (snd_pcm_t *pcm, const snd_pcm_channel_area_t *res_areas, /* result areas */ snd_pcm_uframes_t res_offset, /* offset of result areas */ snd_pcm_uframes_t res_size, /* size of result areas */ snd_pcm_uframes_t slave_undo_size); snd_pcm_sframes_t snd_pcm_plugin_undo_write_generic (snd_pcm_t *pcm, const snd_pcm_channel_area_t *res_areas, /* result areas */ snd_pcm_uframes_t res_offset, /* offset of result areas */ snd_pcm_uframes_t res_size, /* size of result areas */ snd_pcm_uframes_t slave_undo_size); /* make local functions really local */ #define snd_pcm_linear_get_index snd1_pcm_linear_get_index #define snd_pcm_linear_put_index snd1_pcm_linear_put_index #define snd_pcm_linear_convert_index snd1_pcm_linear_convert_index #define snd_pcm_linear_convert snd1_pcm_linear_convert #define snd_pcm_linear_getput snd1_pcm_linear_getput #define snd_pcm_alaw_decode snd1_pcm_alaw_decode #define snd_pcm_alaw_encode snd1_pcm_alaw_encode #define snd_pcm_mulaw_decode snd1_pcm_mulaw_decode #define snd_pcm_mulaw_encode snd1_pcm_mulaw_encode #define snd_pcm_adpcm_decode snd1_pcm_adpcm_decode #define snd_pcm_adpcm_encode snd1_pcm_adpcm_encode int snd_pcm_linear_get_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format); int snd_pcm_linear_put_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format); int snd_pcm_linear_convert_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format); void snd_pcm_linear_convert(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, unsigned int convidx); void snd_pcm_linear_getput(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, unsigned int get_idx, unsigned int put_idx); void snd_pcm_alaw_decode(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, unsigned int putidx); void snd_pcm_alaw_encode(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, unsigned int getidx); void snd_pcm_mulaw_decode(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, unsigned int putidx); void snd_pcm_mulaw_encode(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, unsigned int getidx); typedef struct _snd_pcm_adpcm_state { int pred_val; /* Calculated predicted value */ int step_idx; /* Previous StepSize lookup index */ } snd_pcm_adpcm_state_t; void snd_pcm_adpcm_decode(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, unsigned int putidx, snd_pcm_adpcm_state_t *states); void snd_pcm_adpcm_encode(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, unsigned int getidx, snd_pcm_adpcm_state_t *states);