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_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     char *name, *driver;                /* may be NULL */
  77     pa_module *module;                  /* may be NULL */
  78     pa_client *client;                  /* may be NULL */
  79
  80     pa_sink *sink;
  81
  82     pa_sample_spec sample_spec;
  83     pa_channel_map channel_map;
  84
  85     pa_sink_input *sync_prev, *sync_next;
  86
  87     pa_cvolume volume;
  88     pa_bool_t muted;
  89
  90     /* Returns the chunk of audio data (but doesn't drop it
  91      * yet!). Returns -1 on failure. Called from IO thread context. If
  92      * data needs to be generated from scratch then please in the
  93      * specified length. This is an optimization only. If less data is
  94      * available, it's fine to return a smaller block. If more data is
  95      * already ready, it is better to return the full block.*/
  96     int (*peek) (pa_sink_input *i, size_t length, pa_memchunk *chunk);
  97
  98     /* Drops the specified number of bytes, usually called right after
  99      * peek(), but not necessarily. Called from IO thread context. */
 100     void (*drop) (pa_sink_input *i, size_t length);
 101
 102     /* If non-NULL this function is called when the input is first
 103      * connected to a sink or when the rtpoll/asyncmsgq fields
 104      * change. You usually don't need to implement this function
 105      * unless you rewrite a sink that is piggy-backed onto
 106      * another. Called from IO thread context */
 107     void (*attach) (pa_sink_input *i);           /* may be NULL */
 108
 109     /* If non-NULL this function is called when the output is
 110      * disconnected from its sink. Called from IO thread context */
 111     void (*detach) (pa_sink_input *i);           /* may be NULL */
 112
 113     /* If non-NULL called whenever the the sink this input is attached
 114      * to suspends or resumes. Called from main context */
 115     void (*suspend) (pa_sink_input *i, pa_bool_t b);   /* may be NULL */
 116
 117     /* If non-NULL called whenever the the sink this input is attached
 118      * to changes. Called from main context */
 119     void (*moved) (pa_sink_input *i);   /* may be NULL */
 120
 121     /* Supposed to unlink and destroy this stream. Called from main
 122      * context. */
 123     void (*kill) (pa_sink_input *i);             /* may be NULL */
 124
 125     /* Return the current latency (i.e. length of bufferd audio) of
 126     this stream. Called from main context. If NULL a
 127     PA_SINK_INPUT_MESSAGE_GET_LATENCY message is sent to the IO thread
 128     instead. */
 129     pa_usec_t (*get_latency) (pa_sink_input *i); /* may be NULL */
 130
 131     pa_resample_method_t resample_method;
 132
 133     struct {
 134         pa_sink_input_state_t state;
 135         pa_atomic_t drained;
 136
 137         pa_bool_t attached; /* True only between ->attach() and ->detach() calls */
 138
 139         pa_sample_spec sample_spec;
 140
 141         pa_memchunk resampled_chunk;
 142         pa_resampler *resampler;                     /* may be NULL */
 143
 144         /* Some silence to play before the actual data. This is used to
 145          * compensate for latency differences when moving a sink input
 146          * "hot" between sinks. */
 147         size_t move_silence;
 148         pa_memblock *silence_memblock;               /* may be NULL */
 149
 150         pa_sink_input *sync_prev, *sync_next;
 151
 152         pa_cvolume volume;
 153         pa_bool_t muted;
 154     } thread_info;
 155
 156     void *userdata;
 157 };
 158
 159 PA_DECLARE_CLASS(pa_sink_input);
 160 #define PA_SINK_INPUT(o) pa_sink_input_cast(o)
 161
 162 enum {
 163     PA_SINK_INPUT_MESSAGE_SET_VOLUME,
 164     PA_SINK_INPUT_MESSAGE_SET_MUTE,
 165     PA_SINK_INPUT_MESSAGE_GET_LATENCY,
 166     PA_SINK_INPUT_MESSAGE_SET_RATE,
 167     PA_SINK_INPUT_MESSAGE_SET_STATE,
 168     PA_SINK_INPUT_MESSAGE_MAX
 169 };
 170
 171 typedef struct pa_sink_input_new_data {
 172     const char *name, *driver;
 173     pa_module *module;
 174     pa_client *client;
 175
 176     pa_sink *sink;
 177
 178     pa_sample_spec sample_spec;
 179     pa_bool_t sample_spec_is_set;
 180     pa_channel_map channel_map;
 181     pa_bool_t channel_map_is_set;
 182
 183     pa_cvolume volume;
 184     pa_bool_t volume_is_set;
 185     pa_bool_t muted;
 186     pa_bool_t muted_is_set;
 187
 188     pa_resample_method_t resample_method;
 189
 190     pa_sink_input *sync_base;
 191 } pa_sink_input_new_data;
 192
 193 typedef struct pa_sink_input_move_hook_data {
 194     pa_sink_input *sink_input;
 195     pa_sink *destination;
 196 } pa_sink_input_move_hook_data;
 197
 198 pa_sink_input_new_data* pa_sink_input_new_data_init(pa_sink_input_new_data *data);
 199 void pa_sink_input_new_data_set_sample_spec(pa_sink_input_new_data *data, const pa_sample_spec *spec);
 200 void pa_sink_input_new_data_set_channel_map(pa_sink_input_new_data *data, const pa_channel_map *map);
 201 void pa_sink_input_new_data_set_volume(pa_sink_input_new_data *data, const pa_cvolume *volume);
 202 void pa_sink_input_new_data_set_muted(pa_sink_input_new_data *data, pa_bool_t mute);
 203
 204 /* To be called by the implementing module only */
 205
 206 pa_sink_input* pa_sink_input_new(
 207         pa_core *core,
 208         pa_sink_input_new_data *data,
 209         pa_sink_input_flags_t flags);
 210
 211 void pa_sink_input_put(pa_sink_input *i);
 212 void pa_sink_input_unlink(pa_sink_input* i);
 213
 214 void pa_sink_input_set_name(pa_sink_input *i, const char *name);
 215
 216 /* Callable by everyone */
 217
 218 /* External code may request disconnection with this function */
 219 void pa_sink_input_kill(pa_sink_input*i);
 220
 221 pa_usec_t pa_sink_input_get_latency(pa_sink_input *i);
 222
 223 void pa_sink_input_set_volume(pa_sink_input *i, const pa_cvolume *volume);
 224 const pa_cvolume *pa_sink_input_get_volume(pa_sink_input *i);
 225 void pa_sink_input_set_mute(pa_sink_input *i, pa_bool_t mute);
 226 int pa_sink_input_get_mute(pa_sink_input *i);
 227
 228 void pa_sink_input_cork(pa_sink_input *i, pa_bool_t b);
 229
 230 int pa_sink_input_set_rate(pa_sink_input *i, uint32_t rate);
 231
 232 pa_resample_method_t pa_sink_input_get_resample_method(pa_sink_input *i);
 233
 234 int pa_sink_input_move_to(pa_sink_input *i, pa_sink *dest, int immediately);
 235
 236 pa_sink_input_state_t pa_sink_input_get_state(pa_sink_input *i);
 237
 238 /* To be used exclusively by the sink driver thread */
 239
 240 int pa_sink_input_peek(pa_sink_input *i, size_t length, pa_memchunk *chunk, pa_cvolume *volume);
 241 void pa_sink_input_drop(pa_sink_input *i, size_t length);
 242 int pa_sink_input_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk);
 243
 244 typedef struct pa_sink_input_move_info {
 245     pa_sink_input *sink_input;
 246     pa_sink_input *ghost_sink_input;
 247     pa_memblockq *buffer;
 248     size_t buffer_bytes;
 249 } pa_sink_input_move_info;
 250
 251 #endif