code.delx.au - pulseaudio/blob - src/pulsecore/sound-file-stream.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2008 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 <unistd.h>
  29 #include <fcntl.h>
  30 #include <errno.h>
  31
  32 #include <sndfile.h>
  33
  34 #include <pulse/xmalloc.h>
  35 #include <pulse/util.h>
  36
  37 #include <pulsecore/core-error.h>
  38 #include <pulsecore/sink-input.h>
  39 #include <pulsecore/log.h>
  40 #include <pulsecore/thread-mq.h>
  41 #include <pulsecore/core-util.h>
  42 #include <pulsecore/sndfile-util.h>
  43
  44 #include "sound-file-stream.h"
  45
  46 #define MEMBLOCKQ_MAXLENGTH (16*1024*1024)
  47
  48 typedef struct file_stream {
  49     pa_msgobject parent;
  50     pa_core *core;
  51     pa_sink_input *sink_input;
  52
  53     SNDFILE *sndfile;
  54     sf_count_t (*readf_function)(SNDFILE *sndfile, void *ptr, sf_count_t frames);
  55
  56     /* We need this memblockq here to easily fulfill rewind requests
  57      * (even beyond the file start!) */
  58     pa_memblockq *memblockq;
  59 } file_stream;
  60
  61 enum {
  62     FILE_STREAM_MESSAGE_UNLINK
  63 };
  64
  65 PA_DEFINE_PRIVATE_CLASS(file_stream, pa_msgobject);
  66 #define FILE_STREAM(o) (file_stream_cast(o))
  67
  68 /* Called from main context */
  69 static void file_stream_unlink(file_stream *u) {
  70     pa_assert(u);
  71
  72     if (!u->sink_input)
  73         return;
  74
  75     pa_sink_input_unlink(u->sink_input);
  76     pa_sink_input_unref(u->sink_input);
  77     u->sink_input = NULL;
  78
  79     /* Make sure we don't decrease the ref count twice. */
  80     file_stream_unref(u);
  81 }
  82
  83 /* Called from main context */
  84 static void file_stream_free(pa_object *o) {
  85     file_stream *u = FILE_STREAM(o);
  86     pa_assert(u);
  87
  88     if (u->memblockq)
  89         pa_memblockq_free(u->memblockq);
  90
  91     if (u->sndfile)
  92         sf_close(u->sndfile);
  93
  94     pa_xfree(u);
  95 }
  96
  97 /* Called from main context */
  98 static int file_stream_process_msg(pa_msgobject *o, int code, void*userdata, int64_t offset, pa_memchunk *chunk) {
  99     file_stream *u = FILE_STREAM(o);
 100     file_stream_assert_ref(u);
 101
 102     switch (code) {
 103         case FILE_STREAM_MESSAGE_UNLINK:
 104             file_stream_unlink(u);
 105             break;
 106     }
 107
 108     return 0;
 109 }
 110
 111 /* Called from main context */
 112 static void sink_input_kill_cb(pa_sink_input *i) {
 113     file_stream *u;
 114
 115     pa_sink_input_assert_ref(i);
 116     u = FILE_STREAM(i->userdata);
 117     file_stream_assert_ref(u);
 118
 119     file_stream_unlink(u);
 120 }
 121
 122 /* Called from IO thread context */
 123 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
 124     file_stream *u;
 125
 126     pa_sink_input_assert_ref(i);
 127     u = FILE_STREAM(i->userdata);
 128     file_stream_assert_ref(u);
 129
 130     /* If we are added for the first time, ask for a rewinding so that
 131      * we are heard right-away. */
 132     if (PA_SINK_INPUT_IS_LINKED(state) &&
 133         i->thread_info.state == PA_SINK_INPUT_INIT)
 134         pa_sink_input_request_rewind(i, 0, FALSE, TRUE, TRUE);
 135 }
 136
 137 /* Called from IO thread context */
 138 static int sink_input_pop_cb(pa_sink_input *i, size_t length, pa_memchunk *chunk) {
 139     file_stream *u;
 140
 141     pa_sink_input_assert_ref(i);
 142     pa_assert(chunk);
 143     u = FILE_STREAM(i->userdata);
 144     file_stream_assert_ref(u);
 145
 146     if (!u->memblockq)
 147         return -1;
 148
 149     for (;;) {
 150         pa_memchunk tchunk;
 151         size_t fs;
 152         void *p;
 153         sf_count_t n;
 154
 155         if (pa_memblockq_peek(u->memblockq, chunk) >= 0) {
 156             chunk->length = PA_MIN(chunk->length, length);
 157             pa_memblockq_drop(u->memblockq, chunk->length);
 158             return 0;
 159         }
 160
 161         if (!u->sndfile)
 162             break;
 163
 164         tchunk.memblock = pa_memblock_new(i->sink->core->mempool, length);
 165         tchunk.index = 0;
 166
 167         p = pa_memblock_acquire(tchunk.memblock);
 168
 169         if (u->readf_function) {
 170             fs = pa_frame_size(&i->sample_spec);
 171             n = u->readf_function(u->sndfile, p, (sf_count_t) (length/fs));
 172         } else {
 173             fs = 1;
 174             n = sf_read_raw(u->sndfile, p, (sf_count_t) length);
 175         }
 176
 177         pa_memblock_release(tchunk.memblock);
 178
 179         if (n <= 0) {
 180             pa_memblock_unref(tchunk.memblock);
 181
 182             sf_close(u->sndfile);
 183             u->sndfile = NULL;
 184             break;
 185         }
 186
 187         tchunk.length = (size_t) n * fs;
 188
 189         pa_memblockq_push(u->memblockq, &tchunk);
 190         pa_memblock_unref(tchunk.memblock);
 191     }
 192
 193     if (pa_sink_input_safe_to_remove(i)) {
 194         pa_memblockq_free(u->memblockq);
 195         u->memblockq = NULL;
 196
 197         pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u), FILE_STREAM_MESSAGE_UNLINK, NULL, 0, NULL, NULL);
 198     }
 199
 200     return -1;
 201 }
 202
 203 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
 204     file_stream *u;
 205
 206     pa_sink_input_assert_ref(i);
 207     u = FILE_STREAM(i->userdata);
 208     file_stream_assert_ref(u);
 209
 210     if (!u->memblockq)
 211         return;
 212
 213     pa_memblockq_rewind(u->memblockq, nbytes);
 214 }
 215
 216 static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
 217     file_stream *u;
 218
 219     pa_sink_input_assert_ref(i);
 220     u = FILE_STREAM(i->userdata);
 221     file_stream_assert_ref(u);
 222
 223     if (!u->memblockq)
 224         return;
 225
 226     pa_memblockq_set_maxrewind(u->memblockq, nbytes);
 227 }
 228
 229 int pa_play_file(
 230         pa_sink *sink,
 231         const char *fname,
 232         const pa_cvolume *volume) {
 233
 234     file_stream *u = NULL;
 235     pa_sample_spec ss;
 236     pa_channel_map cm;
 237     pa_sink_input_new_data data;
 238     int fd;
 239     SF_INFO sfi;
 240     pa_memchunk silence;
 241
 242     pa_assert(sink);
 243     pa_assert(fname);
 244
 245     u = pa_msgobject_new(file_stream);
 246     u->parent.parent.free = file_stream_free;
 247     u->parent.process_msg = file_stream_process_msg;
 248     u->core = sink->core;
 249     u->sink_input = NULL;
 250     u->sndfile = NULL;
 251     u->readf_function = NULL;
 252     u->memblockq = NULL;
 253
 254     if ((fd = pa_open_cloexec(fname, O_RDONLY, 0)) < 0) {
 255         pa_log("Failed to open file %s: %s", fname, pa_cstrerror(errno));
 256         goto fail;
 257     }
 258
 259     /* FIXME: For now we just use posix_fadvise to avoid page faults
 260      * when accessing the file data. Eventually we should move the
 261      * file reader into the main event loop and pass the data over the
 262      * asyncmsgq. */
 263
 264 #ifdef HAVE_POSIX_FADVISE
 265     if (posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL) < 0) {
 266         pa_log_warn("POSIX_FADV_SEQUENTIAL failed: %s", pa_cstrerror(errno));
 267         goto fail;
 268     } else
 269         pa_log_debug("POSIX_FADV_SEQUENTIAL succeeded.");
 270
 271     if (posix_fadvise(fd, 0, 0, POSIX_FADV_WILLNEED) < 0) {
 272         pa_log_warn("POSIX_FADV_WILLNEED failed: %s", pa_cstrerror(errno));
 273         goto fail;
 274     } else
 275         pa_log_debug("POSIX_FADV_WILLNEED succeeded.");
 276 #endif
 277
 278     pa_zero(sfi);
 279     if (!(u->sndfile = sf_open_fd(fd, SFM_READ, &sfi, 1))) {
 280         pa_log("Failed to open file %s", fname);
 281         goto fail;
 282     }
 283
 284     fd = -1;
 285
 286     if (pa_sndfile_read_sample_spec(u->sndfile, &ss) < 0) {
 287         pa_log("Failed to determine file sample format.");
 288         goto fail;
 289     }
 290
 291     if (pa_sndfile_read_channel_map(u->sndfile, &cm) < 0) {
 292         if (ss.channels > 2)
 293             pa_log_info("Failed to determine file channel map, synthesizing one.");
 294         pa_channel_map_init_extend(&cm, ss.channels, PA_CHANNEL_MAP_DEFAULT);
 295     }
 296
 297     u->readf_function = pa_sndfile_readf_function(&ss);
 298
 299     pa_sink_input_new_data_init(&data);
 300     pa_sink_input_new_data_set_sink(&data, sink, FALSE);
 301     data.driver = __FILE__;
 302     pa_sink_input_new_data_set_sample_spec(&data, &ss);
 303     pa_sink_input_new_data_set_channel_map(&data, &cm);
 304     pa_sink_input_new_data_set_volume(&data, volume);
 305     pa_proplist_sets(data.proplist, PA_PROP_MEDIA_NAME, pa_path_get_filename(fname));
 306     pa_proplist_sets(data.proplist, PA_PROP_MEDIA_FILENAME, fname);
 307     pa_sndfile_init_proplist(u->sndfile, data.proplist);
 308
 309     pa_sink_input_new(&u->sink_input, sink->core, &data);
 310     pa_sink_input_new_data_done(&data);
 311
 312     if (!u->sink_input)
 313         goto fail;
 314
 315     u->sink_input->pop = sink_input_pop_cb;
 316     u->sink_input->process_rewind = sink_input_process_rewind_cb;
 317     u->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
 318     u->sink_input->kill = sink_input_kill_cb;
 319     u->sink_input->state_change = sink_input_state_change_cb;
 320     u->sink_input->userdata = u;
 321
 322     pa_sink_input_get_silence(u->sink_input, &silence);
 323     u->memblockq = pa_memblockq_new(0, MEMBLOCKQ_MAXLENGTH, 0, pa_frame_size(&ss), 1, 1, 0, &silence);
 324     pa_memblock_unref(silence.memblock);
 325
 326     pa_sink_input_put(u->sink_input);
 327
 328     /* The reference to u is dangling here, because we want to keep
 329      * this stream around until it is fully played. */
 330
 331     return 0;
 332
 333 fail:
 334     file_stream_unref(u);
 335
 336     if (fd >= 0)
 337         pa_close(fd);
 338
 339     return -1;
 340 }