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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 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
  34 #include <pulsecore/sink-input.h>
  35 #include <pulsecore/gccmacro.h>
  36 #include <pulsecore/thread-mq.h>
  37
  38 #include "play-memchunk.h"
  39
  40 typedef struct memchunk_stream {
  41     pa_msgobject parent;
  42     pa_core *core;
  43     pa_sink_input *sink_input;
  44     pa_memchunk memchunk;
  45 } memchunk_stream;
  46
  47 enum {
  48     MEMCHUNK_STREAM_MESSAGE_UNLINK,
  49 };
  50
  51 PA_DECLARE_CLASS(memchunk_stream);
  52 #define MEMCHUNK_STREAM(o) (memchunk_stream_cast(o))
  53 static PA_DEFINE_CHECK_TYPE(memchunk_stream, pa_msgobject);
  54
  55 static void memchunk_stream_unlink(memchunk_stream *u) {
  56     pa_assert(u);
  57
  58     if (!u->sink_input)
  59         return;
  60
  61     pa_sink_input_disconnect(u->sink_input);
  62
  63     pa_sink_input_unref(u->sink_input);
  64     u->sink_input = NULL;
  65
  66     /* Make sure we don't decrease the ref count twice. */
  67     memchunk_stream_unref(u);
  68 }
  69
  70 static void memchunk_stream_free(pa_object *o) {
  71     memchunk_stream *u = MEMCHUNK_STREAM(o);
  72     pa_assert(u);
  73
  74     memchunk_stream_unlink(u);
  75
  76     if (u->memchunk.memblock)
  77         pa_memblock_unref(u->memchunk.memblock);
  78
  79     pa_xfree(u);
  80 }
  81
  82 static int memchunk_stream_process_msg(pa_msgobject *o, int code, void*userdata, int64_t offset, pa_memchunk *chunk) {
  83     memchunk_stream *u = MEMCHUNK_STREAM(o);
  84     memchunk_stream_assert_ref(u);
  85
  86     switch (code) {
  87         case MEMCHUNK_STREAM_MESSAGE_UNLINK:
  88             memchunk_stream_unlink(u);
  89             break;
  90     }
  91
  92     return 0;
  93 }
  94
  95 static void sink_input_kill_cb(pa_sink_input *i) {
  96     pa_sink_input_assert_ref(i);
  97
  98     memchunk_stream_unlink(MEMCHUNK_STREAM(i->userdata));
  99 }
 100
 101 static int sink_input_peek_cb(pa_sink_input *i, pa_memchunk *chunk) {
 102     memchunk_stream *u;
 103
 104     pa_assert(i);
 105     pa_assert(chunk);
 106     u = MEMCHUNK_STREAM(i->userdata);
 107     memchunk_stream_assert_ref(u);
 108
 109     if (!u->memchunk.memblock)
 110         return -1;
 111
 112     if (u->memchunk.length <= 0) {
 113         pa_memblock_unref(u->memchunk.memblock);
 114         u->memchunk.memblock = NULL;
 115         pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u), MEMCHUNK_STREAM_MESSAGE_UNLINK, NULL, 0, NULL, NULL);
 116         return -1;
 117     }
 118
 119     pa_assert(u->memchunk.memblock);
 120     *chunk = u->memchunk;
 121     pa_memblock_ref(chunk->memblock);
 122
 123     return 0;
 124 }
 125
 126 static void sink_input_drop_cb(pa_sink_input *i, size_t length) {
 127     memchunk_stream *u;
 128
 129     pa_assert(i);
 130     pa_assert(length > 0);
 131     u = MEMCHUNK_STREAM(i->userdata);
 132     memchunk_stream_assert_ref(u);
 133
 134     if (length < u->memchunk.length) {
 135         u->memchunk.length -= length;
 136         u->memchunk.index += length;
 137     } else
 138         u->memchunk.length = 0;
 139 }
 140
 141 int pa_play_memchunk(
 142         pa_sink *sink,
 143         const char *name,
 144         const pa_sample_spec *ss,
 145         const pa_channel_map *map,
 146         const pa_memchunk *chunk,
 147         pa_cvolume *volume) {
 148
 149     memchunk_stream *u = NULL;
 150     pa_sink_input_new_data data;
 151
 152     pa_assert(sink);
 153     pa_assert(ss);
 154     pa_assert(chunk);
 155
 156     if (volume && pa_cvolume_is_muted(volume))
 157         return 0;
 158
 159     u = pa_msgobject_new(memchunk_stream);
 160     u->parent.parent.free = memchunk_stream_free;
 161     u->parent.process_msg = memchunk_stream_process_msg;
 162     u->core = sink->core;
 163     u->sink_input = NULL;
 164     u->memchunk = *chunk;
 165     pa_memblock_ref(u->memchunk.memblock);
 166
 167     pa_sink_input_new_data_init(&data);
 168     data.sink = sink;
 169     data.driver = __FILE__;
 170     data.name = name;
 171     pa_sink_input_new_data_set_sample_spec(&data, ss);
 172     pa_sink_input_new_data_set_channel_map(&data, map);
 173     pa_sink_input_new_data_set_volume(&data, volume);
 174
 175     if (!(u->sink_input = pa_sink_input_new(sink->core, &data, 0)))
 176         goto fail;
 177
 178     u->sink_input->peek = sink_input_peek_cb;
 179     u->sink_input->drop = sink_input_drop_cb;
 180     u->sink_input->kill = sink_input_kill_cb;
 181     u->sink_input->userdata = u;
 182
 183     pa_sink_input_put(u->sink_input);
 184
 185     /* The reference to u is dangling here, because we want to keep
 186      * this stream around until it is fully played. */
 187
 188     return 0;
 189
 190 fail:
 191     if (u)
 192         memchunk_stream_unref(u);
 193
 194     return -1;
 195 }
 196