1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef __PCM_PLUGIN_H 3 #define __PCM_PLUGIN_H 4 5 /* 6 * Digital Audio (Plugin interface) abstract layer 7 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 8 */ 9 10 #ifdef CONFIG_SND_PCM_OSS_PLUGINS 11 12 #define snd_pcm_plug_stream(plug) ((plug)->stream) 13 14 enum snd_pcm_plugin_action { 15 INIT = 0, 16 PREPARE = 1, 17 }; 18 19 struct snd_pcm_channel_area { 20 void *addr; /* base address of channel samples */ 21 unsigned int first; /* offset to first sample in bits */ 22 unsigned int step; /* samples distance in bits */ 23 }; 24 25 struct snd_pcm_plugin_channel { 26 void *aptr; /* pointer to the allocated area */ 27 struct snd_pcm_channel_area area; 28 snd_pcm_uframes_t frames; /* allocated frames */ 29 unsigned int enabled:1; /* channel need to be processed */ 30 unsigned int wanted:1; /* channel is wanted */ 31 }; 32 33 struct snd_pcm_plugin_format { 34 snd_pcm_format_t format; 35 unsigned int rate; 36 unsigned int channels; 37 }; 38 39 struct snd_pcm_plugin { 40 const char *name; /* plug-in name */ 41 int stream; 42 struct snd_pcm_plugin_format src_format; /* source format */ 43 struct snd_pcm_plugin_format dst_format; /* destination format */ 44 int src_width; /* sample width in bits */ 45 int dst_width; /* sample width in bits */ 46 snd_pcm_access_t access; 47 snd_pcm_sframes_t (*src_frames)(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t dst_frames); 48 snd_pcm_sframes_t (*dst_frames)(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t src_frames); 49 snd_pcm_sframes_t (*client_channels)(struct snd_pcm_plugin *plugin, 50 snd_pcm_uframes_t frames, 51 struct snd_pcm_plugin_channel **channels); 52 snd_pcm_sframes_t (*transfer)(struct snd_pcm_plugin *plugin, 53 const struct snd_pcm_plugin_channel *src_channels, 54 struct snd_pcm_plugin_channel *dst_channels, 55 snd_pcm_uframes_t frames); 56 int (*action)(struct snd_pcm_plugin *plugin, 57 enum snd_pcm_plugin_action action, 58 unsigned long data); 59 struct snd_pcm_plugin *prev; 60 struct snd_pcm_plugin *next; 61 struct snd_pcm_substream *plug; 62 void *private_data; 63 void (*private_free)(struct snd_pcm_plugin *plugin); 64 char *buf; 65 snd_pcm_uframes_t buf_frames; 66 struct snd_pcm_plugin_channel *buf_channels; 67 char extra_data[]; 68 }; 69 70 int snd_pcm_plugin_build(struct snd_pcm_substream *handle, 71 const char *name, 72 struct snd_pcm_plugin_format *src_format, 73 struct snd_pcm_plugin_format *dst_format, 74 size_t extra, 75 struct snd_pcm_plugin **ret); 76 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin); 77 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames); 78 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_size); 79 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_size); 80 81 #define FULL ROUTE_PLUGIN_RESOLUTION 82 #define HALF ROUTE_PLUGIN_RESOLUTION / 2 83 84 int snd_pcm_plugin_build_io(struct snd_pcm_substream *handle, 85 struct snd_pcm_hw_params *params, 86 struct snd_pcm_plugin **r_plugin); 87 int snd_pcm_plugin_build_linear(struct snd_pcm_substream *handle, 88 struct snd_pcm_plugin_format *src_format, 89 struct snd_pcm_plugin_format *dst_format, 90 struct snd_pcm_plugin **r_plugin); 91 int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *handle, 92 struct snd_pcm_plugin_format *src_format, 93 struct snd_pcm_plugin_format *dst_format, 94 struct snd_pcm_plugin **r_plugin); 95 int snd_pcm_plugin_build_rate(struct snd_pcm_substream *handle, 96 struct snd_pcm_plugin_format *src_format, 97 struct snd_pcm_plugin_format *dst_format, 98 struct snd_pcm_plugin **r_plugin); 99 int snd_pcm_plugin_build_route(struct snd_pcm_substream *handle, 100 struct snd_pcm_plugin_format *src_format, 101 struct snd_pcm_plugin_format *dst_format, 102 struct snd_pcm_plugin **r_plugin); 103 int snd_pcm_plugin_build_copy(struct snd_pcm_substream *handle, 104 struct snd_pcm_plugin_format *src_format, 105 struct snd_pcm_plugin_format *dst_format, 106 struct snd_pcm_plugin **r_plugin); 107 108 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *substream, 109 struct snd_pcm_hw_params *params, 110 struct snd_pcm_hw_params *slave_params); 111 112 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, 113 const struct snd_mask *format_mask); 114 115 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin); 116 117 snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *handle, 118 struct snd_pcm_plugin_channel *src_channels, 119 snd_pcm_uframes_t size); 120 snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *handle, 121 struct snd_pcm_plugin_channel *dst_channels_final, 122 snd_pcm_uframes_t size); 123 124 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *handle, 125 char *buf, snd_pcm_uframes_t count, 126 struct snd_pcm_plugin_channel **channels); 127 128 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin, 129 snd_pcm_uframes_t frames, 130 struct snd_pcm_plugin_channel **channels); 131 132 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_channel, 133 size_t dst_offset, 134 size_t samples, snd_pcm_format_t format); 135 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_channel, 136 size_t src_offset, 137 const struct snd_pcm_channel_area *dst_channel, 138 size_t dst_offset, 139 size_t samples, snd_pcm_format_t format); 140 141 #else 142 143 static inline snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_size) { return drv_size; } 144 static inline snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_size) { return clt_size; } 145 static inline int snd_pcm_plug_slave_format(int format, const struct snd_mask *format_mask) { return format; } 146 147 #endif 148 149 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, 150 const char *ptr, snd_pcm_uframes_t size, 151 int in_kernel); 152 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, 153 char *ptr, snd_pcm_uframes_t size, int in_kernel); 154 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, 155 void **bufs, snd_pcm_uframes_t frames); 156 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, 157 void **bufs, snd_pcm_uframes_t frames); 158 159 #ifdef PLUGIN_DEBUG 160 #define pdprintf(fmt, args...) pr_debug("plugin: " fmt, ##args) 161 #else 162 #define pdprintf(fmt, args...) 163 #endif 164 165 #endif /* __PCM_PLUGIN_H */ 166