code.delx.au - pulseaudio/blob - src/pulsecore/play-memblockq.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2006-2008 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31
  32 #include <pulse/xmalloc.h>
  33 #include <pulse/gccmacro.h>
  34
  35 #include <pulsecore/sink-input.h>
  36 #include <pulsecore/thread-mq.h>
  37 #include <pulsecore/sample-util.h>
  38
  39 #include "play-memblockq.h"
  40
  41 typedef struct memblockq_stream {
  42     pa_msgobject parent;
  43     pa_core *core;
  44     pa_sink_input *sink_input;
  45     pa_memblockq *memblockq;
  46 } memblockq_stream;
  47
  48 enum {
  49     MEMBLOCKQ_STREAM_MESSAGE_UNLINK,
  50 };
  51
  52 PA_DECLARE_CLASS(memblockq_stream);
  53 #define MEMBLOCKQ_STREAM(o) (memblockq_stream_cast(o))
  54 static PA_DEFINE_CHECK_TYPE(memblockq_stream, pa_msgobject);
  55
  56 static void memblockq_stream_unlink(memblockq_stream *u) {
  57     pa_assert(u);
  58
  59     if (!u->sink_input)
  60         return;
  61
  62     pa_sink_input_unlink(u->sink_input);
  63     pa_sink_input_unref(u->sink_input);
  64     u->sink_input = NULL;
  65
  66     memblockq_stream_unref(u);
  67 }
  68
  69 static void memblockq_stream_free(pa_object *o) {
  70     memblockq_stream *u = MEMBLOCKQ_STREAM(o);
  71     pa_assert(u);
  72
  73     if (u->memblockq)
  74         pa_memblockq_free(u->memblockq);
  75
  76     pa_xfree(u);
  77 }
  78
  79 static int memblockq_stream_process_msg(pa_msgobject *o, int code, void*userdata, int64_t offset, pa_memchunk *chunk) {
  80     memblockq_stream *u = MEMBLOCKQ_STREAM(o);
  81     memblockq_stream_assert_ref(u);
  82
  83     switch (code) {
  84         case MEMBLOCKQ_STREAM_MESSAGE_UNLINK:
  85             memblockq_stream_unlink(u);
  86             break;
  87     }
  88
  89     return 0;
  90 }
  91
  92 static void sink_input_kill_cb(pa_sink_input *i) {
  93     memblockq_stream *u;
  94
  95     pa_sink_input_assert_ref(i);
  96     u = MEMBLOCKQ_STREAM(i->userdata);
  97     memblockq_stream_assert_ref(u);
  98
  99     memblockq_stream_unlink(u);
 100 }
 101
 102 /* Called from IO thread context */
 103 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
 104     memblockq_stream *u;
 105
 106     pa_sink_input_assert_ref(i);
 107     u = MEMBLOCKQ_STREAM(i->userdata);
 108     memblockq_stream_assert_ref(u);
 109
 110     /* If we are added for the first time, ask for a rewinding so that
 111      * we are heard right-away. */
 112     if (PA_SINK_INPUT_IS_LINKED(state) &&
 113         i->thread_info.state == PA_SINK_INPUT_INIT)
 114         pa_sink_input_request_rewind(i, 0, FALSE, TRUE);
 115 }
 116
 117 static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
 118     memblockq_stream *u;
 119
 120     pa_sink_input_assert_ref(i);
 121     pa_assert(chunk);
 122     u = MEMBLOCKQ_STREAM(i->userdata);
 123     memblockq_stream_assert_ref(u);
 124
 125     if (!u->memblockq)
 126         return -1;
 127
 128     if (pa_memblockq_peek(u->memblockq, chunk) < 0) {
 129
 130         if (pa_sink_input_safe_to_remove(i)) {
 131
 132             pa_memblockq_free(u->memblockq);
 133             u->memblockq = NULL;
 134
 135             pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u), MEMBLOCKQ_STREAM_MESSAGE_UNLINK, NULL, 0, NULL, NULL);
 136         }
 137
 138         return -1;
 139     }
 140
 141     chunk->length = PA_MIN(chunk->length, nbytes);
 142     pa_memblockq_drop(u->memblockq, chunk->length);
 143
 144     return 0;
 145 }
 146
 147 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
 148     memblockq_stream *u;
 149
 150     pa_sink_input_assert_ref(i);
 151     pa_assert(nbytes > 0);
 152     u = MEMBLOCKQ_STREAM(i->userdata);
 153     memblockq_stream_assert_ref(u);
 154
 155     if (!u->memblockq)
 156         return;
 157
 158     pa_memblockq_rewind(u->memblockq, nbytes);
 159 }
 160
 161 static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
 162     memblockq_stream *u;
 163
 164     pa_sink_input_assert_ref(i);
 165     u = MEMBLOCKQ_STREAM(i->userdata);
 166     memblockq_stream_assert_ref(u);
 167
 168     if (!u->memblockq)
 169         return;
 170
 171     pa_memblockq_set_maxrewind(u->memblockq, nbytes);
 172 }
 173
 174 pa_sink_input* pa_memblockq_sink_input_new(
 175         pa_sink *sink,
 176         const pa_sample_spec *ss,
 177         const pa_channel_map *map,
 178         pa_memblockq *q,
 179         pa_cvolume *volume,
 180         pa_proplist *p) {
 181
 182     memblockq_stream *u = NULL;
 183     pa_sink_input_new_data data;
 184
 185     pa_assert(sink);
 186     pa_assert(ss);
 187
 188     /* We allow creating this stream with no q set, so that it can be
 189      * filled in later */
 190
 191     u = pa_msgobject_new(memblockq_stream);
 192     u->parent.parent.free = memblockq_stream_free;
 193     u->parent.process_msg = memblockq_stream_process_msg;
 194     u->core = sink->core;
 195     u->sink_input = NULL;
 196     u->memblockq = NULL;
 197
 198     pa_sink_input_new_data_init(&data);
 199     data.sink = sink;
 200     data.driver = __FILE__;
 201     pa_sink_input_new_data_set_sample_spec(&data, ss);
 202     pa_sink_input_new_data_set_channel_map(&data, map);
 203     pa_sink_input_new_data_set_volume(&data, volume);
 204     pa_proplist_update(data.proplist, PA_UPDATE_REPLACE, p);
 205
 206     u->sink_input = pa_sink_input_new(sink->core, &data, 0);
 207     pa_sink_input_new_data_done(&data);
 208
 209     if (!u->sink_input)
 210         goto fail;
 211
 212     u->sink_input->pop = sink_input_pop_cb;
 213     u->sink_input->process_rewind = sink_input_process_rewind_cb;
 214     u->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
 215     u->sink_input->kill = sink_input_kill_cb;
 216     u->sink_input->state_change = sink_input_state_change_cb;
 217     u->sink_input->userdata = u;
 218
 219     if (q)
 220         pa_memblockq_sink_input_set_queue(u->sink_input, q);
 221
 222     /* The reference to u is dangling here, because we want
 223      * to keep this stream around until it is fully played. */
 224
 225     /* This sink input is not "put" yet, i.e. pa_sink_input_put() has
 226      * not been called! */
 227
 228     return pa_sink_input_ref(u->sink_input);
 229
 230 fail:
 231     if (u)
 232         memblockq_stream_unref(u);
 233
 234     return NULL;
 235 }
 236
 237 int pa_play_memblockq(
 238         pa_sink *sink,
 239         const pa_sample_spec *ss,
 240         const pa_channel_map *map,
 241         pa_memblockq *q,
 242         pa_cvolume *volume,
 243         pa_proplist *p,
 244         uint32_t *sink_input_index) {
 245
 246     pa_sink_input *i;
 247
 248     pa_assert(sink);
 249     pa_assert(ss);
 250     pa_assert(q);
 251
 252     if (!(i = pa_memblockq_sink_input_new(sink, ss, map, q, volume, p)))
 253         return -1;
 254
 255     pa_sink_input_put(i);
 256
 257     if (sink_input_index)
 258         *sink_input_index = i->index;
 259
 260     pa_sink_input_unref(i);
 261
 262     return 0;
 263 }
 264
 265 void pa_memblockq_sink_input_set_queue(pa_sink_input *i, pa_memblockq *q) {
 266     memblockq_stream *u;
 267
 268     pa_sink_input_assert_ref(i);
 269     u = MEMBLOCKQ_STREAM(i->userdata);
 270     memblockq_stream_assert_ref(u);
 271
 272     if (u->memblockq)
 273         pa_memblockq_free(u->memblockq);
 274
 275     if ((u->memblockq = q)) {
 276         pa_memblockq_set_prebuf(q, 0);
 277         pa_memblockq_set_silence(q, NULL);
 278         pa_memblockq_willneed(q);
 279     }
 280 }