code.delx.au - pulseaudio/blob - src/pulsecore/sink-input.h

   1 #ifndef foopulsesinkinputhfoo
   2 #define foopulsesinkinputhfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2004-2006 Lennart Poettering
   8   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   9
  10   PulseAudio is free software; you can redistribute it and/or modify
  11   it under the terms of the GNU Lesser General Public License as published
  12   by the Free Software Foundation; either version 2 of the License,
  13   or (at your option) any later version.
  14
  15   PulseAudio is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with PulseAudio; if not, write to the Free Software
  22   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  23   USA.
  24 ***/
  25
  26 #include <inttypes.h>
  27
  28 typedef struct pa_sink_input pa_sink_input;
  29
  30 #include <pulse/sample.h>
  31 #include <pulsecore/hook-list.h>
  32 #include <pulsecore/memblockq.h>
  33 #include <pulsecore/resampler.h>
  34 #include <pulsecore/module.h>
  35 #include <pulsecore/client.h>
  36 #include <pulsecore/sink.h>
  37 #include <pulsecore/core.h>
  38
  39 typedef enum pa_sink_input_state {
  40     PA_SINK_INPUT_INIT,         /*< The stream is not active yet, because pa_sink_put() has not been called yet */
  41     PA_SINK_INPUT_DRAINED,      /*< The stream stopped playing because there was no data to play */
  42     PA_SINK_INPUT_RUNNING,      /*< The stream is alive and kicking */
  43     PA_SINK_INPUT_CORKED,       /*< The stream was corked on user request */
  44     PA_SINK_INPUT_UNLINKED      /*< The stream is dead */
  45 } pa_sink_input_state_t;
  46
  47 static inline pa_bool_t PA_SINK_INPUT_IS_LINKED(pa_sink_input_state_t x) {
  48     return x == PA_SINK_INPUT_DRAINED || x == PA_SINK_INPUT_RUNNING || x == PA_SINK_INPUT_CORKED;
  49 }
  50
  51 typedef enum pa_sink_input_flags {
  52     PA_SINK_INPUT_VARIABLE_RATE = 1,
  53     PA_SINK_INPUT_DONT_MOVE = 2,
  54     PA_SINK_INPUT_START_CORKED = 4,
  55     PA_SINK_INPUT_NO_REMAP = 8,
  56     PA_SINK_INPUT_NO_REMIX = 16,
  57     PA_SINK_INPUT_FIX_FORMAT = 32,
  58     PA_SINK_INPUT_FIX_RATE = 64,
  59     PA_SINK_INPUT_FIX_CHANNELS = 128,
  60     PA_SINK_INPUT_DONT_INHIBIT_AUTO_SUSPEND = 256,
  61 } pa_sink_input_flags_t;
  62
  63 struct pa_sink_input {
  64     pa_msgobject parent;
  65
  66     uint32_t index;
  67     pa_core *core;
  68
  69     /* Please note that this state should only be read with
  70      * pa_sink_input_get_state(). That function will transparently
  71      * merge the thread_info.drained value in. */
  72     pa_sink_input_state_t state;
  73     pa_sink_input_flags_t flags;
  74
  75     char *driver;                       /* may be NULL */
  76     pa_proplist *proplist;
  77
  78     pa_module *module;                  /* may be NULL */
  79     pa_client *client;                  /* may be NULL */
  80
  81     pa_sink *sink; /* NULL while we are being moved */
  82
  83     /* A sink input may be connected to multiple source outputs
  84      * directly, so that they don't get mixed data of the entire
  85      * source. */
  86     pa_idxset *direct_outputs;
  87
  88     pa_sample_spec sample_spec;
  89     pa_channel_map channel_map;
  90
  91     pa_sink_input *sync_prev, *sync_next;
  92
  93     pa_cvolume virtual_volume;
  94
  95     pa_cvolume volume;
  96     pa_bool_t muted;
  97
  98     pa_resample_method_t resample_method;
  99
 100     /* Returns the chunk of audio data and drops it from the
 101      * queue. Returns -1 on failure. Called from IO thread context. If
 102      * data needs to be generated from scratch then please in the
 103      * specified length request_nbytes. This is an optimization
 104      * only. If less data is available, it's fine to return a smaller
 105      * block. If more data is already ready, it is better to return
 106      * the full block. */
 107     int (*pop) (pa_sink_input *i, size_t request_nbytes, pa_memchunk *chunk); /* may NOT be NULL */
 108
 109     /* Rewind the queue by the specified number of bytes. Called just
 110      * before peek() if it is called at all. Only called if the sink
 111      * input driver ever plans to call
 112      * pa_sink_input_request_rewind(). Called from IO context. */
 113     void (*process_rewind) (pa_sink_input *i, size_t nbytes);     /* may NOT be NULL */
 114
 115     /* Called whenever the maximum rewindable size of the sink
 116      * changes. Called from IO context. */
 117     void (*update_max_rewind) (pa_sink_input *i, size_t nbytes); /* may be NULL */
 118
 119     /* Called whenever the maxiumum request size of the sink
 120      * changes. Called from IO context. */
 121     void (*update_max_request) (pa_sink_input *i, size_t nbytes); /* may be NULL */
 122
 123     /* Called whenever the configured latency of the sink
 124      * changes. Called from IO context. */
 125     void (*update_sink_requested_latency) (pa_sink_input *i); /* may be NULL */
 126
 127     /* Called whenver the latency range of the sink changes. Called
 128      * from IO context. */
 129     void (*update_sink_latency_range) (pa_sink_input *i); /* may be NULL */
 130
 131     /* If non-NULL this function is called when the input is first
 132      * connected to a sink or when the rtpoll/asyncmsgq fields
 133      * change. You usually don't need to implement this function
 134      * unless you rewrite a sink that is piggy-backed onto
 135      * another. Called from IO thread context */
 136     void (*attach) (pa_sink_input *i);           /* may be NULL */
 137
 138     /* If non-NULL this function is called when the output is
 139      * disconnected from its sink. Called from IO thread context */
 140     void (*detach) (pa_sink_input *i);           /* may be NULL */
 141
 142     /* If non-NULL called whenever the the sink this input is attached
 143      * to suspends or resumes. Called from main context */
 144     void (*suspend) (pa_sink_input *i, pa_bool_t b);   /* may be NULL */
 145
 146     /* If non-NULL called whenever the the sink this input is attached
 147      * to changes. Called from main context */
 148     void (*moved) (pa_sink_input *i);   /* may be NULL */
 149
 150     /* Supposed to unlink and destroy this stream. Called from main
 151      * context. */
 152     void (*kill) (pa_sink_input *i);             /* may NOT be NULL */
 153
 154     /* Return the current latency (i.e. length of bufferd audio) of
 155     this stream. Called from main context. This is added to what the
 156     PA_SINK_INPUT_MESSAGE_GET_LATENCY message sent to the IO thread
 157     returns */
 158     pa_usec_t (*get_latency) (pa_sink_input *i); /* may be NULL */
 159
 160     /* If non-NULL this function is called from thread context if the
 161      * state changes. The old state is found in thread_info.state.  */
 162     void (*state_change) (pa_sink_input *i, pa_sink_input_state_t state); /* may be NULL */
 163
 164     /* If non-NULL this function is called before this sink input is
 165      * move to a sink and if it returns FALSE the move will not
 166      * be allowed */
 167     pa_bool_t (*may_move_to) (pa_sink_input *i, pa_sink *s); /* may be NULL */
 168
 169     struct {
 170         pa_sink_input_state_t state;
 171         pa_atomic_t drained;
 172
 173         pa_bool_t attached; /* True only between ->attach() and ->detach() calls */
 174
 175         pa_sample_spec sample_spec;
 176
 177         pa_resampler *resampler;                     /* may be NULL */
 178
 179         /* We maintain a history of resampled audio data here. */
 180         pa_memblockq *render_memblockq;
 181
 182         /* 0: rewrite nothing, (size_t) -1: rewrite everything, otherwise how many bytes to rewrite */
 183         size_t rewrite_nbytes;
 184         pa_bool_t rewrite_flush, dont_rewind_render;
 185         uint64_t underrun_for, playing_for;
 186
 187         pa_sink_input *sync_prev, *sync_next;
 188
 189         pa_cvolume volume;
 190         pa_bool_t muted;
 191
 192         /* The requested latency for the sink */
 193         pa_usec_t requested_sink_latency;
 194
 195         pa_hashmap *direct_outputs;
 196     } thread_info;
 197
 198     void *userdata;
 199 };
 200
 201 PA_DECLARE_CLASS(pa_sink_input);
 202 #define PA_SINK_INPUT(o) pa_sink_input_cast(o)
 203
 204 enum {
 205     PA_SINK_INPUT_MESSAGE_SET_VOLUME,
 206     PA_SINK_INPUT_MESSAGE_SET_MUTE,
 207     PA_SINK_INPUT_MESSAGE_GET_LATENCY,
 208     PA_SINK_INPUT_MESSAGE_SET_RATE,
 209     PA_SINK_INPUT_MESSAGE_SET_STATE,
 210     PA_SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY,
 211     PA_SINK_INPUT_MESSAGE_GET_REQUESTED_LATENCY,
 212     PA_SINK_INPUT_MESSAGE_MAX
 213 };
 214
 215 typedef struct pa_sink_input_new_data {
 216     pa_proplist *proplist;
 217
 218     const char *driver;
 219     pa_module *module;
 220     pa_client *client;
 221
 222     pa_sink *sink;
 223
 224     pa_resample_method_t resample_method;
 225
 226     pa_sink_input *sync_base;
 227
 228     pa_sample_spec sample_spec;
 229     pa_channel_map channel_map;
 230
 231     pa_cvolume virtual_volume;
 232
 233     pa_cvolume volume;
 234     pa_bool_t muted:1;
 235
 236     pa_bool_t sample_spec_is_set:1;
 237     pa_bool_t channel_map_is_set:1;
 238     pa_bool_t volume_is_set:1;
 239     pa_bool_t muted_is_set:1;
 240 } pa_sink_input_new_data;
 241
 242 pa_sink_input_new_data* pa_sink_input_new_data_init(pa_sink_input_new_data *data);
 243 void pa_sink_input_new_data_set_sample_spec(pa_sink_input_new_data *data, const pa_sample_spec *spec);
 244 void pa_sink_input_new_data_set_channel_map(pa_sink_input_new_data *data, const pa_channel_map *map);
 245 void pa_sink_input_new_data_set_volume(pa_sink_input_new_data *data, const pa_cvolume *volume);
 246 void pa_sink_input_new_data_set_muted(pa_sink_input_new_data *data, pa_bool_t mute);
 247 void pa_sink_input_new_data_done(pa_sink_input_new_data *data);
 248
 249 typedef struct pa_sink_set_input_volume_data {
 250   pa_sink_input *sink_input;
 251   pa_cvolume virtual_volume;
 252   pa_cvolume volume;
 253 } pa_sink_input_set_volume_data;
 254
 255 /* To be called by the implementing module only */
 256
 257 pa_sink_input* pa_sink_input_new(
 258         pa_core *core,
 259         pa_sink_input_new_data *data,
 260         pa_sink_input_flags_t flags);
 261
 262 void pa_sink_input_put(pa_sink_input *i);
 263 void pa_sink_input_unlink(pa_sink_input* i);
 264
 265 void pa_sink_input_set_name(pa_sink_input *i, const char *name);
 266
 267 pa_usec_t pa_sink_input_set_requested_latency(pa_sink_input *i, pa_usec_t usec);
 268
 269 /* Request that the specified number of bytes already written out to
 270 the hw device is rewritten, if possible.  Please note that this is
 271 only a kind request. The sink driver may not be able to fulfill it
 272 fully -- or at all. If the request for a rewrite was successful, the
 273 sink driver will call ->rewind() and pass the number of bytes that
 274 could be rewound in the HW device. This functionality is required for
 275 implementing the "zero latency" write-through functionality. */
 276 void pa_sink_input_request_rewind(pa_sink_input *i, size_t nbytes, pa_bool_t rewrite, pa_bool_t flush, pa_bool_t dont_rewind_render);
 277
 278 void pa_sink_input_cork(pa_sink_input *i, pa_bool_t b);
 279
 280 int pa_sink_input_set_rate(pa_sink_input *i, uint32_t rate);
 281
 282 /* Callable by everyone from main thread*/
 283
 284 /* External code may request disconnection with this function */
 285 void pa_sink_input_kill(pa_sink_input*i);
 286
 287 pa_usec_t pa_sink_input_get_latency(pa_sink_input *i, pa_usec_t *sink_latency);
 288
 289 void pa_sink_input_set_volume(pa_sink_input *i, const pa_cvolume *volume);
 290 const pa_cvolume *pa_sink_input_get_volume(pa_sink_input *i);
 291 void pa_sink_input_set_mute(pa_sink_input *i, pa_bool_t mute);
 292 pa_bool_t pa_sink_input_get_mute(pa_sink_input *i);
 293 pa_bool_t pa_sink_input_update_proplist(pa_sink_input *i, pa_update_mode_t mode, pa_proplist *p);
 294
 295 pa_resample_method_t pa_sink_input_get_resample_method(pa_sink_input *i);
 296
 297 int pa_sink_input_move_to(pa_sink_input *i, pa_sink *dest);
 298 pa_bool_t pa_sink_input_may_move(pa_sink_input *i); /* may this sink input move at all? */
 299 pa_bool_t pa_sink_input_may_move_to(pa_sink_input *i, pa_sink *dest); /* may this sink input move to this sink? */
 300
 301 /* The same as pa_sink_input_move_to() but in two seperate steps,
 302  * first the detaching from the old sink, then the attaching to the
 303  * new sink */
 304 int pa_sink_input_start_move(pa_sink_input *i);
 305 int pa_sink_input_finish_move(pa_sink_input *i, pa_sink *dest);
 306
 307 pa_sink_input_state_t pa_sink_input_get_state(pa_sink_input *i);
 308
 309 pa_usec_t pa_sink_input_get_requested_latency(pa_sink_input *i);
 310
 311 /* To be used exclusively by the sink driver IO thread */
 312
 313 int pa_sink_input_peek(pa_sink_input *i, size_t length, pa_memchunk *chunk, pa_cvolume *volume);
 314 void pa_sink_input_drop(pa_sink_input *i, size_t length);
 315 void pa_sink_input_process_rewind(pa_sink_input *i, size_t nbytes /* in the sink's sample spec */);
 316 void pa_sink_input_update_max_rewind(pa_sink_input *i, size_t nbytes  /* in the sink's sample spec */);
 317 void pa_sink_input_update_max_request(pa_sink_input *i, size_t nbytes  /* in the sink's sample spec */);
 318
 319 void pa_sink_input_set_state_within_thread(pa_sink_input *i, pa_sink_input_state_t state);
 320
 321 int pa_sink_input_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk);
 322
 323 pa_usec_t pa_sink_input_set_requested_latency_within_thread(pa_sink_input *i, pa_usec_t usec);
 324
 325 pa_bool_t pa_sink_input_safe_to_remove(pa_sink_input *i);
 326
 327 pa_memchunk* pa_sink_input_get_silence(pa_sink_input *i, pa_memchunk *ret);
 328
 329 #endif