1 /* 2 * PCM - Common plugin code 3 * Copyright (c) 2000 by Abramo Bagnara <abramo (at) alsa-project.org> 4 * 5 * 6 * This library is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU Lesser General Public License as 8 * published by the Free Software Foundation; either version 2.1 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include "iatomic.h" 23 #include "pcm_generic.h" 24 25 typedef snd_pcm_uframes_t (*snd_pcm_slave_xfer_areas_func_t) 26 (snd_pcm_t *pcm, 27 const snd_pcm_channel_area_t *areas, 28 snd_pcm_uframes_t offset, 29 snd_pcm_uframes_t size, 30 const snd_pcm_channel_area_t *slave_areas, 31 snd_pcm_uframes_t slave_offset, 32 snd_pcm_uframes_t *slave_sizep); 33 34 typedef snd_pcm_sframes_t (*snd_pcm_slave_xfer_areas_undo_func_t) 35 (snd_pcm_t *pcm, 36 const snd_pcm_channel_area_t *res_areas, /* result areas */ 37 snd_pcm_uframes_t res_offset, /* offset of result areas */ 38 snd_pcm_uframes_t res_size, /* size of result areas */ 39 snd_pcm_uframes_t slave_undo_size); 40 41 typedef struct { 42 snd_pcm_generic_t gen; 43 snd_pcm_slave_xfer_areas_func_t read; 44 snd_pcm_slave_xfer_areas_func_t write; 45 snd_pcm_slave_xfer_areas_undo_func_t undo_read; 46 snd_pcm_slave_xfer_areas_undo_func_t undo_write; 47 snd_pcm_sframes_t (*client_frames)(snd_pcm_t *pcm, snd_pcm_sframes_t frames); 48 snd_pcm_sframes_t (*slave_frames)(snd_pcm_t *pcm, snd_pcm_sframes_t frames); 49 int (*init)(snd_pcm_t *pcm); 50 snd_pcm_uframes_t appl_ptr, hw_ptr; 51 snd_atomic_write_t watom; 52 } snd_pcm_plugin_t; 53 54 /* make local functions really local */ 55 #define snd_pcm_plugin_init \ 56 snd1_pcm_plugin_init 57 #define snd_pcm_plugin_fast_ops \ 58 snd1_pcm_plugin_fast_ops 59 #define snd_pcm_plugin_undo_read_generic \ 60 snd1_pcm_plugin_undo_read_generic 61 #define snd_pcm_plugin_undo_write_generic \ 62 snd1_pcm_plugin_undo_write_generic 63 64 void snd_pcm_plugin_init(snd_pcm_plugin_t *plugin); 65 66 extern const snd_pcm_fast_ops_t snd_pcm_plugin_fast_ops; 67 68 snd_pcm_sframes_t snd_pcm_plugin_undo_read_generic 69 (snd_pcm_t *pcm, 70 const snd_pcm_channel_area_t *res_areas, /* result areas */ 71 snd_pcm_uframes_t res_offset, /* offset of result areas */ 72 snd_pcm_uframes_t res_size, /* size of result areas */ 73 snd_pcm_uframes_t slave_undo_size); 74 75 snd_pcm_sframes_t snd_pcm_plugin_undo_write_generic 76 (snd_pcm_t *pcm, 77 const snd_pcm_channel_area_t *res_areas, /* result areas */ 78 snd_pcm_uframes_t res_offset, /* offset of result areas */ 79 snd_pcm_uframes_t res_size, /* size of result areas */ 80 snd_pcm_uframes_t slave_undo_size); 81 82 /* make local functions really local */ 83 #define snd_pcm_linear_get_index snd1_pcm_linear_get_index 84 #define snd_pcm_linear_put_index snd1_pcm_linear_put_index 85 #define snd_pcm_linear_get32_index snd1_pcm_linear_get32_index 86 #define snd_pcm_linear_put32_index snd1_pcm_linear_put32_index 87 #define snd_pcm_linear_convert_index snd1_pcm_linear_convert_index 88 #define snd_pcm_linear_convert snd1_pcm_linear_convert 89 #define snd_pcm_linear_getput snd1_pcm_linear_getput 90 #define snd_pcm_alaw_decode snd1_pcm_alaw_decode 91 #define snd_pcm_alaw_encode snd1_pcm_alaw_encode 92 #define snd_pcm_mulaw_decode snd1_pcm_mulaw_decode 93 #define snd_pcm_mulaw_encode snd1_pcm_mulaw_encode 94 #define snd_pcm_adpcm_decode snd1_pcm_adpcm_decode 95 #define snd_pcm_adpcm_encode snd1_pcm_adpcm_encode 96 97 int snd_pcm_linear_get_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format); 98 int snd_pcm_linear_put_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format); 99 int snd_pcm_linear_get32_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format); 100 int snd_pcm_linear_put32_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format); 101 int snd_pcm_linear_convert_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format); 102 103 void snd_pcm_linear_convert(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, 104 const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, 105 unsigned int channels, snd_pcm_uframes_t frames, 106 unsigned int convidx); 107 void snd_pcm_linear_getput(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, 108 const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, 109 unsigned int channels, snd_pcm_uframes_t frames, 110 unsigned int get_idx, unsigned int put_idx); 111 void snd_pcm_alaw_decode(const snd_pcm_channel_area_t *dst_areas, 112 snd_pcm_uframes_t dst_offset, 113 const snd_pcm_channel_area_t *src_areas, 114 snd_pcm_uframes_t src_offset, 115 unsigned int channels, snd_pcm_uframes_t frames, 116 unsigned int putidx); 117 void snd_pcm_alaw_encode(const snd_pcm_channel_area_t *dst_areas, 118 snd_pcm_uframes_t dst_offset, 119 const snd_pcm_channel_area_t *src_areas, 120 snd_pcm_uframes_t src_offset, 121 unsigned int channels, snd_pcm_uframes_t frames, 122 unsigned int getidx); 123 void snd_pcm_mulaw_decode(const snd_pcm_channel_area_t *dst_areas, 124 snd_pcm_uframes_t dst_offset, 125 const snd_pcm_channel_area_t *src_areas, 126 snd_pcm_uframes_t src_offset, 127 unsigned int channels, snd_pcm_uframes_t frames, 128 unsigned int putidx); 129 void snd_pcm_mulaw_encode(const snd_pcm_channel_area_t *dst_areas, 130 snd_pcm_uframes_t dst_offset, 131 const snd_pcm_channel_area_t *src_areas, 132 snd_pcm_uframes_t src_offset, 133 unsigned int channels, snd_pcm_uframes_t frames, 134 unsigned int getidx); 135 136 typedef struct _snd_pcm_adpcm_state { 137 int pred_val; /* Calculated predicted value */ 138 int step_idx; /* Previous StepSize lookup index */ 139 } snd_pcm_adpcm_state_t; 140 141 void snd_pcm_adpcm_decode(const snd_pcm_channel_area_t *dst_areas, 142 snd_pcm_uframes_t dst_offset, 143 const snd_pcm_channel_area_t *src_areas, 144 snd_pcm_uframes_t src_offset, 145 unsigned int channels, snd_pcm_uframes_t frames, 146 unsigned int putidx, 147 snd_pcm_adpcm_state_t *states); 148 void snd_pcm_adpcm_encode(const snd_pcm_channel_area_t *dst_areas, 149 snd_pcm_uframes_t dst_offset, 150 const snd_pcm_channel_area_t *src_areas, 151 snd_pcm_uframes_t src_offset, 152 unsigned int channels, snd_pcm_uframes_t frames, 153 unsigned int getidx, 154 snd_pcm_adpcm_state_t *states); 155
