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

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