1 | //stream.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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5 | * The code (may) include prototypes and comments (and maybe |
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6 | * other code fragements) from libpulse*. They are mostly copyrighted by: |
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7 | * Lennart Poettering <poettering@users.sourceforge.net> and |
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8 | * Pierre Ossman <drzeus@drzeus.cx> |
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9 | * |
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10 | * This file is part of libroarpulse a part of RoarAudio, |
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11 | * a cross-platform sound system for both, home and professional use. |
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12 | * See README for details. |
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13 | * |
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14 | * This file is free software; you can redistribute it and/or modify |
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15 | * it under the terms of the GNU General Public License version 3 |
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16 | * as published by the Free Software Foundation. |
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17 | * |
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18 | * RoarAudio is distributed in the hope that it will be useful, |
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19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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21 | * GNU General Public License for more details. |
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22 | * |
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23 | * You should have received a copy of the GNU General Public License |
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24 | * along with this software; see the file COPYING. If not, write to |
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25 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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26 | * |
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27 | * NOTE for everyone want's to change something and send patches: |
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28 | * read README and HACKING! There a addition information on |
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29 | * the license of this document you need to read before you send |
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30 | * any patches. |
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31 | * |
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32 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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33 | * or libpulse*: |
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34 | * The libs libroaresd, libroararts and libroarpulse link this libroar |
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35 | * and are therefore GPL. Because of this it may be illigal to use |
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36 | * them with any software that uses libesd, libartsc or libpulse*. |
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37 | */ |
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38 | |
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39 | #include <libroarpulse/libroarpulse.h> |
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40 | |
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41 | struct _roar_pa_stream_cb { |
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42 | union { |
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43 | pa_stream_notify_cb_t ncb; |
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44 | pa_stream_request_cb_t rcb; |
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45 | pa_stream_success_cb_t scb; |
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46 | } cb; |
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47 | void * userdata; |
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48 | }; |
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49 | |
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50 | struct pa_stream { |
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51 | size_t refc; |
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52 | pa_context * c; |
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53 | struct roar_vio_calls vio; |
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54 | struct roar_stream stream; |
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55 | pa_stream_state_t state; |
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56 | pa_sample_spec sspec; |
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57 | pa_io_event * io_event; |
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58 | struct roar_buffer * iobuffer; |
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59 | struct { |
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60 | size_t size; |
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61 | size_t num; |
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62 | } fragments; |
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63 | struct { |
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64 | struct _roar_pa_stream_cb change_state; |
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65 | struct _roar_pa_stream_cb write; |
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66 | struct _roar_pa_stream_cb read; |
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67 | struct _roar_pa_stream_cb overflow; |
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68 | struct _roar_pa_stream_cb underflow; |
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69 | struct _roar_pa_stream_cb latency; |
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70 | } cb; |
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71 | }; |
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72 | |
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73 | typedef void pa_proplist; |
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74 | void pa_stream_set_state(pa_stream *s, pa_stream_state_t st); |
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75 | |
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76 | pa_stream* pa_stream_new_with_proplist( |
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77 | pa_context *c , |
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78 | const char *name , |
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79 | const pa_sample_spec *ss , |
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80 | const pa_channel_map *map , |
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81 | pa_proplist *p ); |
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82 | |
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83 | /** Create a new, unconnected stream with the specified name and sample type */ |
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84 | pa_stream* pa_stream_new( |
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85 | pa_context *c /**< The context to create this stream in */, |
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86 | const char *name /**< A name for this stream */, |
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87 | const pa_sample_spec *ss /**< The desired sample format */, |
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88 | const pa_channel_map *map /**< The desired channel map, or NULL for default */) { |
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89 | return pa_stream_new_with_proplist(c, name, ss, map, NULL); |
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90 | } |
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91 | |
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92 | pa_stream* pa_stream_new_with_proplist( |
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93 | pa_context *c , |
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94 | const char *name , |
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95 | const pa_sample_spec *ss , |
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96 | const pa_channel_map *map , |
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97 | pa_proplist *p ) { |
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98 | pa_stream * s; |
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99 | |
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100 | ROAR_DBG("pa_stream_new_with_proplist(c=%p, name='%s', ss=%p, map=%p, p=%p) = ?", c, name, ss, map, p); |
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101 | |
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102 | if ( p != NULL ) |
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103 | return NULL; |
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104 | |
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105 | if ( (s = roar_mm_malloc(sizeof(pa_stream))) == NULL ) |
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106 | return NULL; |
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107 | |
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108 | memset(s, 0, sizeof(pa_stream)); |
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109 | |
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110 | memcpy(&(s->sspec), ss, sizeof(pa_sample_spec)); |
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111 | |
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112 | ROAR_DBG("pa_stream_new_with_proplist(c=%p, name='%s', ss=%p, map=%p, p=%p) = ?", c, name, ss, map, p); |
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113 | |
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114 | if ( roar_pa_sspec2auinfo(&(s->stream.info), ss) == -1 ) { |
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115 | roar_mm_free(s); |
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116 | ROAR_DBG("pa_stream_new_with_proplist(c=%p, name='%s', ss=%p, map=%p, p=%p) = NULL // invalid format", c, name, ss, map, p); |
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117 | return NULL; |
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118 | } |
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119 | |
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120 | s->fragments.num = 4; |
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121 | s->fragments.size = 2048; |
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122 | |
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123 | s->state = PA_STREAM_UNCONNECTED; |
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124 | s->c = c; |
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125 | pa_context_ref(c); |
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126 | |
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127 | ROAR_DBG("pa_stream_new_with_proplist(c=%p, name='%s', ss=%p, map=%p, p=%p) = ?", c, name, ss, map, p); |
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128 | |
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129 | return s; |
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130 | } |
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131 | |
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132 | static void _pa_stream_free(pa_stream * s) { |
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133 | pa_stream_disconnect(s); |
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134 | pa_context_unref(s->c); |
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135 | roar_mm_free(s); |
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136 | } |
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137 | |
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138 | /** Decrease the reference counter by one */ |
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139 | void pa_stream_unref(pa_stream *s) { |
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140 | if ( s == NULL ) |
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141 | return; |
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142 | |
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143 | s->refc--; |
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144 | |
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145 | if (s->refc < 1 ) |
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146 | _pa_stream_free(s); |
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147 | } |
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148 | |
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149 | /** Increase the reference counter by one */ |
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150 | pa_stream *pa_stream_ref(pa_stream *s) { |
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151 | if ( s == NULL ) |
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152 | return NULL; |
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153 | |
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154 | s->refc++; |
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155 | |
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156 | return s; |
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157 | } |
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158 | |
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159 | /** Return the current state of the stream */ |
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160 | pa_stream_state_t pa_stream_get_state(pa_stream *p) { |
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161 | if ( p == NULL ) |
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162 | return PA_STREAM_FAILED; |
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163 | |
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164 | return p->state; |
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165 | } |
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166 | |
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167 | /** Return the context this stream is attached to */ |
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168 | pa_context* pa_stream_get_context(pa_stream *p) { |
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169 | if ( p == NULL ) |
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170 | return NULL; |
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171 | |
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172 | return p->c; |
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173 | } |
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174 | |
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175 | /** Return the device (sink input or source output) index this stream is connected to */ |
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176 | uint32_t pa_stream_get_index(pa_stream *s) { |
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177 | return 0; |
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178 | } |
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179 | |
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180 | static void _roar_pa_stream_ioecb(pa_mainloop_api * ea, |
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181 | pa_io_event * e, |
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182 | int fd, |
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183 | pa_io_event_flags_t events, |
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184 | void * userdata) { |
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185 | ROAR_DBG("_roar_pa_stream_ioecb(*) = (void)"); |
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186 | } |
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187 | |
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188 | static int _roar_pa_stream_open (pa_stream *s, |
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189 | const char *dev, |
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190 | const pa_buffer_attr *attr, |
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191 | pa_stream_flags_t flags, |
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192 | pa_cvolume *volume, |
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193 | pa_stream *sync_stream, |
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194 | pa_stream_direction_t dir) { |
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195 | struct roar_connection * con; |
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196 | pa_mainloop_api * api; |
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197 | pa_io_event_flags_t event_flags = PA_IO_EVENT_HANGUP; |
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198 | int fh; |
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199 | int ctl = -1; |
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200 | |
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201 | if ( s == NULL ) |
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202 | return -1; |
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203 | |
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204 | if ( attr != NULL || flags != 0 || volume != NULL || sync_stream != NULL ) { |
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205 | pa_stream_set_state(s, PA_STREAM_FAILED); |
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206 | return -1; |
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207 | } |
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208 | |
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209 | if ( (con = roar_pa_context_get_con(s->c)) == NULL ) { |
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210 | pa_stream_set_state(s, PA_STREAM_FAILED); |
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211 | return -1; |
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212 | } |
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213 | |
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214 | switch (dir) { |
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215 | case PA_STREAM_PLAYBACK: |
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216 | s->stream.dir = ROAR_DIR_PLAY; |
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217 | ctl = ROAR_VIO_CTL_GET_SELECT_WRITE_FH; |
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218 | event_flags |= PA_IO_EVENT_OUTPUT; |
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219 | break; |
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220 | case PA_STREAM_RECORD: |
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221 | s->stream.dir = ROAR_DIR_MONITOR; |
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222 | ctl = ROAR_VIO_CTL_GET_SELECT_READ_FH; |
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223 | event_flags |= PA_IO_EVENT_INPUT; |
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224 | break; |
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225 | default: |
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226 | pa_stream_set_state(s, PA_STREAM_FAILED); |
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227 | return -1; |
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228 | break; |
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229 | } |
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230 | |
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231 | if ( roar_vio_simple_new_stream_obj(&(s->vio), con, &(s->stream), |
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232 | s->stream.info.rate, s->stream.info.channels, |
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233 | s->stream.info.bits, s->stream.info.codec, |
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234 | s->stream.dir) == -1 ) { |
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235 | pa_stream_set_state(s, PA_STREAM_FAILED); |
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236 | return -1; |
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237 | } |
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238 | |
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239 | api = roar_pa_context_get_api(s->c); |
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240 | |
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241 | if ( api != NULL && api->io_new != NULL ) { |
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242 | if ( roar_vio_ctl(&(s->vio), ctl, &fh) != -1 ) { |
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243 | s->io_event = api->io_new(api, fh, event_flags, _roar_pa_stream_ioecb, s); |
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244 | } |
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245 | } |
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246 | |
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247 | pa_stream_set_state(s, PA_STREAM_READY); |
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248 | |
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249 | return 0; |
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250 | } |
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251 | |
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252 | /** Connect the stream to a sink */ |
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253 | int pa_stream_connect_playback( |
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254 | pa_stream *s /**< The stream to connect to a sink */, |
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255 | const char *dev /**< Name of the sink to connect to, or NULL for default */ , |
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256 | const pa_buffer_attr *attr /**< Buffering attributes, or NULL for default */, |
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257 | pa_stream_flags_t flags /**< Additional flags, or 0 for default */, |
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258 | pa_cvolume *volume /**< Initial volume, or NULL for default */, |
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259 | pa_stream *sync_stream /**< Synchronize this stream with the specified one, or NULL for a standalone stream*/) { |
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260 | return _roar_pa_stream_open(s, dev, attr, flags, volume, sync_stream, PA_STREAM_PLAYBACK); |
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261 | } |
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262 | |
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263 | /** Connect the stream to a source */ |
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264 | int pa_stream_connect_record( |
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265 | pa_stream *s /**< The stream to connect to a source */ , |
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266 | const char *dev /**< Name of the source to connect to, or NULL for default */, |
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267 | const pa_buffer_attr *attr /**< Buffer attributes, or NULL for default */, |
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268 | pa_stream_flags_t flags /**< Additional flags, or 0 for default */) { |
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269 | return _roar_pa_stream_open(s, dev, attr, flags, NULL, NULL, PA_STREAM_RECORD); |
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270 | } |
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271 | |
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272 | /** Disconnect a stream from a source/sink */ |
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273 | int pa_stream_disconnect(pa_stream *s) { |
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274 | pa_mainloop_api * api; |
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275 | |
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276 | if ( s == NULL ) |
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277 | return -1; |
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278 | |
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279 | if ( s->state != PA_STREAM_READY ) |
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280 | return -1; |
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281 | |
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282 | if ( s->io_event != NULL ) { |
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283 | api = roar_pa_context_get_api(s->c); |
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284 | |
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285 | if ( api != NULL && api->io_free != NULL ) { |
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286 | api->io_free(s->io_event); |
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287 | s->io_event = NULL; |
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288 | } |
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289 | } |
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290 | |
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291 | roar_vio_close(&(s->vio)); |
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292 | |
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293 | pa_stream_set_state(s, PA_STREAM_TERMINATED); |
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294 | |
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295 | return 0; |
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296 | } |
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297 | |
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298 | /** Write some data to the server (for playback sinks), if free_cb is |
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299 | * non-NULL this routine is called when all data has been written out |
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300 | * and an internal reference to the specified data is kept, the data |
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301 | * is not copied. If NULL, the data is copied into an internal |
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302 | * buffer. The client my freely seek around in the output buffer. For |
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303 | * most applications passing 0 and PA_SEEK_RELATIVE as arguments for |
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304 | * offset and seek should be useful.*/ |
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305 | int pa_stream_write( |
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306 | pa_stream *p /**< The stream to use */, |
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307 | const void *data /**< The data to write */, |
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308 | size_t length /**< The length of the data to write */, |
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309 | pa_free_cb_t free_cb /**< A cleanup routine for the data or NULL to request an internal copy */, |
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310 | int64_t offset, /**< Offset for seeking, must be 0 for upload streams */ |
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311 | pa_seek_mode_t seek /**< Seek mode, must be PA_SEEK_RELATIVE for upload streams */) { |
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312 | struct roar_buffer * buf; |
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313 | void * bufdata; |
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314 | |
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315 | // TODO: implement seeking in output buffer |
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316 | |
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317 | if ( p == NULL ) |
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318 | return -1; |
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319 | |
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320 | if ( offset != 0 || seek != PA_SEEK_RELATIVE ) |
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321 | return -1; |
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322 | |
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323 | if ( data == NULL ) { |
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324 | if ( length == 0 ) { |
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325 | if ( free_cb != NULL ) |
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326 | free_cb(NULL); |
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327 | |
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328 | return 0; |
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329 | } else { |
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330 | return -1; |
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331 | } |
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332 | } |
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333 | |
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334 | // seems we have a valid write from here. |
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335 | |
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336 | if ( roar_buffer_new(&buf, length) == -1 ) { |
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337 | if ( free_cb != NULL ) |
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338 | free_cb((void*)data); |
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339 | |
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340 | return -1; |
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341 | } |
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342 | |
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343 | if ( roar_buffer_get_data(buf, &bufdata) == -1 ) { |
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344 | if ( free_cb != NULL ) |
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345 | free_cb((void*)data); |
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346 | |
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347 | return -1; |
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348 | } |
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349 | |
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350 | memcpy(bufdata, data, length); |
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351 | if ( free_cb != NULL ) |
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352 | free_cb((void*)data); |
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353 | |
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354 | if ( p->iobuffer == NULL ) { |
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355 | p->iobuffer = buf; |
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356 | } else { |
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357 | if ( roar_buffer_add(p->iobuffer, buf) == -1 ) |
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358 | return -1; |
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359 | } |
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360 | |
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361 | return 0; |
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362 | } |
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363 | |
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364 | /** Read the next fragment from the buffer (for recording). |
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365 | * data will point to the actual data and length will contain the size |
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366 | * of the data in bytes (which can be less than a complete framgnet). |
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367 | * Use pa_stream_drop() to actually remove the data from the |
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368 | * buffer. If no data is available will return a NULL pointer \since 0.8 */ |
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369 | int pa_stream_peek( |
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370 | pa_stream *p /**< The stream to use */, |
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371 | const void **data /**< Pointer to pointer that will point to data */, |
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372 | size_t *length /**< The length of the data read */) { |
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373 | if ( data == NULL || length == NULL ) |
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374 | return -1; |
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375 | |
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376 | *data = NULL; |
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377 | *length = 0; |
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378 | |
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379 | if ( p == NULL ) |
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380 | return -1; |
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381 | |
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382 | if ( p->iobuffer == NULL ) |
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383 | return 0; |
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384 | |
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385 | if ( roar_buffer_get_len(p->iobuffer, length) == -1 ) { |
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386 | *length = 0; |
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387 | return -1; |
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388 | } |
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389 | |
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390 | if ( roar_buffer_get_data(p->iobuffer, (void**)data) == -1 ) { |
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391 | *length = 0; |
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392 | *data = NULL; |
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393 | return -1; |
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394 | } |
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395 | |
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396 | return 0; |
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397 | } |
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398 | |
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399 | /** Remove the current fragment on record streams. It is invalid to do this without first |
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400 | * calling pa_stream_peek(). \since 0.8 */ |
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401 | int pa_stream_drop(pa_stream *p) { |
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402 | if ( p == NULL ) |
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403 | return -1; |
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404 | |
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405 | if ( p->iobuffer == NULL ) |
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406 | return -1; |
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407 | |
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408 | return roar_buffer_next(&(p->iobuffer)); |
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409 | } |
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410 | |
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411 | /** Return the nember of bytes that may be written using pa_stream_write() */ |
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412 | size_t pa_stream_writable_size(pa_stream *p) { |
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413 | struct roar_buffer_stats stats; |
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414 | |
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415 | if ( p == NULL ) |
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416 | return 0; |
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417 | |
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418 | if ( p->iobuffer == NULL ) |
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419 | return 0; |
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420 | |
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421 | if ( roar_buffer_ring_stats(p->iobuffer, &stats) == -1 ) |
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422 | return 0; |
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423 | |
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424 | if ( stats.parts > p->fragments.num ) |
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425 | return 0; |
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426 | |
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427 | return (p->fragments.num - stats.parts)*p->fragments.size; |
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428 | } |
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429 | |
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430 | /** Return the number of bytes that may be read using pa_stream_read() \since 0.8 */ |
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431 | size_t pa_stream_readable_size(pa_stream *p) { |
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432 | struct roar_buffer_stats stats; |
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433 | |
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434 | if ( p == NULL ) |
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435 | return 0; |
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436 | |
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437 | if ( p->iobuffer == NULL ) |
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438 | return 0; |
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439 | |
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440 | if ( roar_buffer_ring_stats(p->iobuffer, &stats) == -1 ) |
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441 | return 0; |
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442 | |
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443 | return stats.bytes; |
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444 | } |
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445 | |
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446 | /** Drain a playback stream. Use this for notification when the buffer is empty */ |
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447 | pa_operation* pa_stream_drain(pa_stream *s, pa_stream_success_cb_t cb, void *userdata); |
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448 | |
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449 | /** Request a timing info structure update for a stream. Use |
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450 | * pa_stream_get_timing_info() to get access to the raw timing data, |
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451 | * or pa_stream_get_time() or pa_stream_get_latency() to get cleaned |
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452 | * up values. */ |
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453 | pa_operation* pa_stream_update_timing_info(pa_stream *p, pa_stream_success_cb_t cb, void *userdata); |
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454 | |
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455 | /** Set the callback function that is called whenever the state of the stream changes */ |
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456 | void pa_stream_set_state_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) { |
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457 | if ( s == NULL ) |
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458 | return; |
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459 | |
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460 | s->cb.change_state.cb.ncb = cb; |
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461 | s->cb.change_state.userdata = userdata; |
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462 | } |
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463 | |
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464 | void pa_stream_set_state(pa_stream *s, pa_stream_state_t st) { |
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465 | if ( s == NULL ) |
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466 | return; |
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467 | |
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468 | s->state = st; |
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469 | |
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470 | if ( s->cb.change_state.cb.ncb == NULL ) { |
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471 | s->cb.change_state.cb.ncb(s, s->cb.change_state.userdata); |
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472 | } |
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473 | } |
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474 | |
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475 | /** Set the callback function that is called when new data may be |
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476 | * written to the stream. */ |
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477 | void pa_stream_set_write_callback(pa_stream *p, pa_stream_request_cb_t cb, void *userdata) { |
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478 | if ( p == NULL ) |
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479 | return; |
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480 | |
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481 | p->cb.write.cb.rcb = cb; |
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482 | p->cb.write.userdata = userdata; |
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483 | } |
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484 | |
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485 | /** Set the callback function that is called when new data is available from the stream. |
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486 | * Return the number of bytes read. \since 0.8 */ |
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487 | void pa_stream_set_read_callback(pa_stream *p, pa_stream_request_cb_t cb, void *userdata) { |
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488 | if ( p == NULL ) |
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489 | return; |
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490 | |
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491 | p->cb.read.cb.rcb = cb; |
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492 | p->cb.read.userdata = userdata; |
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493 | } |
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494 | |
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495 | /** Set the callback function that is called when a buffer overflow happens. (Only for playback streams) \since 0.8 */ |
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496 | void pa_stream_set_overflow_callback(pa_stream *p, pa_stream_notify_cb_t cb, void *userdata) { |
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497 | if ( p == NULL ) |
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498 | return; |
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499 | |
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500 | p->cb.overflow.cb.ncb = cb; |
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501 | p->cb.overflow.userdata = userdata; |
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502 | } |
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503 | |
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504 | /** Set the callback function that is called when a buffer underflow happens. (Only for playback streams) \since 0.8 */ |
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505 | void pa_stream_set_underflow_callback(pa_stream *p, pa_stream_notify_cb_t cb, void *userdata) { |
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506 | if ( p == NULL ) |
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507 | return; |
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508 | |
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509 | p->cb.underflow.cb.ncb = cb; |
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510 | p->cb.underflow.userdata = userdata; |
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511 | } |
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512 | |
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513 | /** Set the callback function that is called whenever a latency information update happens. Useful on PA_STREAM_AUTO_TIMING_UPDATE streams only. (Only for playback streams) \since 0.8.2 */ |
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514 | void pa_stream_set_latency_update_callback(pa_stream *p, pa_stream_notify_cb_t cb, void *userdata) { |
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515 | if ( p == NULL ) |
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516 | return; |
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517 | |
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518 | p->cb.latency.cb.ncb = cb; |
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519 | p->cb.latency.userdata = userdata; |
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520 | } |
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521 | |
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522 | /** Pause (or resume) playback of this stream temporarily. Available on both playback and recording streams. \since 0.3 */ |
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523 | pa_operation* pa_stream_cork(pa_stream *s, int b, pa_stream_success_cb_t cb, void *userdata); |
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524 | |
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525 | /** Flush the playback buffer of this stream. Most of the time you're |
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526 | * better off using the parameter delta of pa_stream_write() instead of this |
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527 | * function. Available on both playback and recording streams. \since 0.3 */ |
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528 | pa_operation* pa_stream_flush(pa_stream *s, pa_stream_success_cb_t cb, void *userdata); |
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529 | /** Reenable prebuffering as specified in the pa_buffer_attr |
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530 | * structure. Available for playback streams only. \since 0.6 */ |
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531 | pa_operation* pa_stream_prebuf(pa_stream *s, pa_stream_success_cb_t cb, void *userdata); |
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532 | |
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533 | /** Request immediate start of playback on this stream. This disables |
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534 | * prebuffering as specified in the pa_buffer_attr |
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535 | * structure, temporarily. Available for playback streams only. \since 0.3 */ |
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536 | pa_operation* pa_stream_trigger(pa_stream *s, pa_stream_success_cb_t cb, void *userdata); |
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537 | |
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538 | /** Rename the stream. \since 0.5 */ |
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539 | pa_operation* pa_stream_set_name(pa_stream *s, const char *name, pa_stream_success_cb_t cb, void *userdata); |
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540 | |
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541 | /** Return the current playback/recording time. This is based on the |
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542 | * data in the timing info structure returned by |
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543 | * pa_stream_get_timing_info(). This function will usually only return |
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544 | * new data if a timing info update has been recieved. Only if timing |
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545 | * interpolation has been requested (PA_STREAM_INTERPOLATE_TIMING) |
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546 | * the data from the last timing update is used for an estimation of |
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547 | * the current playback/recording time based on the local time that |
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548 | * passed since the timing info structure has been acquired. The time |
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549 | * value returned by this function is guaranteed to increase |
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550 | * monotonically. (that means: the returned value is always greater or |
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551 | * equal to the value returned on the last call) This behaviour can |
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552 | * be disabled by using PA_STREAM_NOT_MONOTONOUS. This may be |
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553 | * desirable to deal better with bad estimations of transport |
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554 | * latencies, but may have strange effects if the application is not |
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555 | * able to deal with time going 'backwards'. \since 0.6 */ |
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556 | int pa_stream_get_time(pa_stream *s, pa_usec_t *r_usec); |
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557 | |
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558 | /** Return the total stream latency. This function is based on |
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559 | * pa_stream_get_time(). In case the stream is a monitoring stream the |
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560 | * result can be negative, i.e. the captured samples are not yet |
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561 | * played. In this case *negative is set to 1. \since 0.6 */ |
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562 | int pa_stream_get_latency(pa_stream *s, pa_usec_t *r_usec, int *negative); |
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563 | |
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564 | /** Return the latest raw timing data structure. The returned pointer |
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565 | * points to an internal read-only instance of the timing |
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566 | * structure. The user should make a copy of this structure if he |
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567 | * wants to modify it. An in-place update to this data structure may |
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568 | * be requested using pa_stream_update_timing_info(). If no |
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569 | * pa_stream_update_timing_info() call was issued before, this |
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570 | * function will fail with PA_ERR_NODATA. Please note that the |
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571 | * write_index member field (and only this field) is updated on each |
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572 | * pa_stream_write() call, not just when a timing update has been |
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573 | * recieved. \since 0.8 */ |
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574 | const pa_timing_info* pa_stream_get_timing_info(pa_stream *s); |
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575 | |
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576 | /** Return a pointer to the stream's sample specification. \since 0.6 */ |
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577 | const pa_sample_spec* pa_stream_get_sample_spec(pa_stream *s) { |
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578 | if ( s == NULL ) |
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579 | return NULL; |
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580 | |
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581 | return &(s->sspec); |
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582 | } |
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583 | |
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584 | /** Return a pointer to the stream's channel map. \since 0.8 */ |
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585 | const pa_channel_map* pa_stream_get_channel_map(pa_stream *s); |
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586 | |
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587 | /** Return the buffer metrics of the stream. Only valid after the |
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588 | * stream has been connected successfuly and if the server is at least |
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589 | * PulseAudio 0.9. \since 0.9.0 */ |
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590 | const pa_buffer_attr* pa_stream_get_buffer_attr(pa_stream *s); |
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591 | |
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592 | //ll |
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