src/pulsecore/play-memblockq.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006-2008 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29
  30 #include <pulse/xmalloc.h>
  31 #include <pulse/gccmacro.h>
  32
  33 #include <pulsecore/sink-input.h>
  34 #include <pulsecore/thread-mq.h>
  35 #include <pulsecore/sample-util.h>
  36
  37 #include "play-memblockq.h"
  38
  39 typedef struct memblockq_stream {
  40     pa_msgobject parent;
  41     pa_core *core;
  42     pa_sink_input *sink_input;
  43     pa_memblockq *memblockq;
  44 } memblockq_stream;
  45
  46 enum {
  47     MEMBLOCKQ_STREAM_MESSAGE_UNLINK,
  48 };
  49
  50 PA_DEFINE_PRIVATE_CLASS(memblockq_stream, pa_msgobject);
  51 #define MEMBLOCKQ_STREAM(o) (memblockq_stream_cast(o))
  52
  53 static void memblockq_stream_unlink(memblockq_stream *u) {
  54     pa_assert(u);
  55
  56     if (!u->sink_input)
  57         return;
  58
  59     pa_sink_input_unlink(u->sink_input);
  60     pa_sink_input_unref(u->sink_input);
  61     u->sink_input = NULL;
  62
  63     memblockq_stream_unref(u);
  64 }
  65
  66 static void memblockq_stream_free(pa_object *o) {
  67     memblockq_stream *u = MEMBLOCKQ_STREAM(o);
  68     pa_assert(u);
  69
  70     if (u->memblockq)
  71         pa_memblockq_free(u->memblockq);
  72
  73     pa_xfree(u);
  74 }
  75
  76 static int memblockq_stream_process_msg(pa_msgobject *o, int code, void*userdata, int64_t offset, pa_memchunk *chunk) {
  77     memblockq_stream *u = MEMBLOCKQ_STREAM(o);
  78     memblockq_stream_assert_ref(u);
  79
  80     switch (code) {
  81         case MEMBLOCKQ_STREAM_MESSAGE_UNLINK:
  82             memblockq_stream_unlink(u);
  83             break;
  84     }
  85
  86     return 0;
  87 }
  88
  89 static void sink_input_kill_cb(pa_sink_input *i) {
  90     memblockq_stream *u;
  91
  92     pa_sink_input_assert_ref(i);
  93     u = MEMBLOCKQ_STREAM(i->userdata);
  94     memblockq_stream_assert_ref(u);
  95
  96     memblockq_stream_unlink(u);
  97 }
  98
  99 /* Called from IO thread context */
 100 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
 101     memblockq_stream *u;
 102
 103     pa_sink_input_assert_ref(i);
 104     u = MEMBLOCKQ_STREAM(i->userdata);
 105     memblockq_stream_assert_ref(u);
 106
 107     /* If we are added for the first time, ask for a rewinding so that
 108      * we are heard right-away. */
 109     if (PA_SINK_INPUT_IS_LINKED(state) &&
 110         i->thread_info.state == PA_SINK_INPUT_INIT)
 111         pa_sink_input_request_rewind(i, 0, FALSE, TRUE, TRUE);
 112 }
 113
 114 static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
 115     memblockq_stream *u;
 116
 117     pa_sink_input_assert_ref(i);
 118     pa_assert(chunk);
 119     u = MEMBLOCKQ_STREAM(i->userdata);
 120     memblockq_stream_assert_ref(u);
 121
 122     if (!u->memblockq)
 123         return -1;
 124
 125     if (pa_memblockq_peek(u->memblockq, chunk) < 0) {
 126
 127         if (pa_sink_input_safe_to_remove(i)) {
 128
 129             pa_memblockq_free(u->memblockq);
 130             u->memblockq = NULL;
 131
 132             pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u), MEMBLOCKQ_STREAM_MESSAGE_UNLINK, NULL, 0, NULL, NULL);
 133         }
 134
 135         return -1;
 136     }
 137
 138     chunk->length = PA_MIN(chunk->length, nbytes);
 139     pa_memblockq_drop(u->memblockq, chunk->length);
 140
 141     return 0;
 142 }
 143
 144 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
 145     memblockq_stream *u;
 146
 147     pa_sink_input_assert_ref(i);
 148     u = MEMBLOCKQ_STREAM(i->userdata);
 149     memblockq_stream_assert_ref(u);
 150
 151     if (!u->memblockq)
 152         return;
 153
 154     pa_memblockq_rewind(u->memblockq, nbytes);
 155 }
 156
 157 static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
 158     memblockq_stream *u;
 159
 160     pa_sink_input_assert_ref(i);
 161     u = MEMBLOCKQ_STREAM(i->userdata);
 162     memblockq_stream_assert_ref(u);
 163
 164     if (!u->memblockq)
 165         return;
 166
 167     pa_memblockq_set_maxrewind(u->memblockq, nbytes);
 168 }
 169
 170 pa_sink_input* pa_memblockq_sink_input_new(
 171         pa_sink *sink,
 172         const pa_sample_spec *ss,
 173         const pa_channel_map *map,
 174         pa_memblockq *q,
 175         pa_cvolume *volume,
 176         pa_proplist *p) {
 177
 178     memblockq_stream *u = NULL;
 179     pa_sink_input_new_data data;
 180
 181     pa_assert(sink);
 182     pa_assert(ss);
 183
 184     /* We allow creating this stream with no q set, so that it can be
 185      * filled in later */
 186
 187     u = pa_msgobject_new(memblockq_stream);
 188     u->parent.parent.free = memblockq_stream_free;
 189     u->parent.process_msg = memblockq_stream_process_msg;
 190     u->core = sink->core;
 191     u->sink_input = NULL;
 192     u->memblockq = NULL;
 193
 194     pa_sink_input_new_data_init(&data);
 195     data.sink = sink;
 196     data.driver = __FILE__;
 197     pa_sink_input_new_data_set_sample_spec(&data, ss);
 198     pa_sink_input_new_data_set_channel_map(&data, map);
 199     pa_sink_input_new_data_set_volume(&data, volume);
 200     pa_proplist_update(data.proplist, PA_UPDATE_REPLACE, p);
 201
 202     pa_sink_input_new(&u->sink_input, sink->core, &data, 0);
 203     pa_sink_input_new_data_done(&data);
 204
 205     if (!u->sink_input)
 206         goto fail;
 207
 208     u->sink_input->pop = sink_input_pop_cb;
 209     u->sink_input->process_rewind = sink_input_process_rewind_cb;
 210     u->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
 211     u->sink_input->kill = sink_input_kill_cb;
 212     u->sink_input->state_change = sink_input_state_change_cb;
 213     u->sink_input->userdata = u;
 214
 215     if (q)
 216         pa_memblockq_sink_input_set_queue(u->sink_input, q);
 217
 218     /* The reference to u is dangling here, because we want
 219      * to keep this stream around until it is fully played. */
 220
 221     /* This sink input is not "put" yet, i.e. pa_sink_input_put() has
 222      * not been called! */
 223
 224     return pa_sink_input_ref(u->sink_input);
 225
 226 fail:
 227     if (u)
 228         memblockq_stream_unref(u);
 229
 230     return NULL;
 231 }
 232
 233 int pa_play_memblockq(
 234         pa_sink *sink,
 235         const pa_sample_spec *ss,
 236         const pa_channel_map *map,
 237         pa_memblockq *q,
 238         pa_cvolume *volume,
 239         pa_proplist *p,
 240         uint32_t *sink_input_index) {
 241
 242     pa_sink_input *i;
 243
 244     pa_assert(sink);
 245     pa_assert(ss);
 246     pa_assert(q);
 247
 248     if (!(i = pa_memblockq_sink_input_new(sink, ss, map, q, volume, p)))
 249         return -1;
 250
 251     pa_sink_input_put(i);
 252
 253     if (sink_input_index)
 254         *sink_input_index = i->index;
 255
 256     pa_sink_input_unref(i);
 257
 258     return 0;
 259 }
 260
 261 void pa_memblockq_sink_input_set_queue(pa_sink_input *i, pa_memblockq *q) {
 262     memblockq_stream *u;
 263
 264     pa_sink_input_assert_ref(i);
 265     u = MEMBLOCKQ_STREAM(i->userdata);
 266     memblockq_stream_assert_ref(u);
 267
 268     if (u->memblockq)
 269         pa_memblockq_free(u->memblockq);
 270
 271     if ((u->memblockq = q)) {
 272         pa_memblockq_set_prebuf(q, 0);
 273         pa_memblockq_set_silence(q, NULL);
 274         pa_memblockq_willneed(q);
 275     }
 276 }