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 <string.h>
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <errno.h>
  32
  33 #include <sndfile.h>
  34
  35 #include <pulse/xmalloc.h>
  36 #include <pulse/util.h>
  37
  38 #include <pulsecore/core-error.h>
  39 #include <pulsecore/sink-input.h>
  40 #include <pulsecore/log.h>
  41 #include <pulsecore/thread-mq.h>
  42 #include <pulsecore/core-util.h>
  43 #include <pulsecore/sample-util.h>
  44 #include <pulsecore/sndfile-util.h>
  45
  46 #include "sound-file-stream.h"
  47
  48 #define MEMBLOCKQ_MAXLENGTH (16*1024*1024)
  49
  50 typedef struct file_stream {
  51     pa_msgobject parent;
  52     pa_core *core;
  53     pa_sink_input *sink_input;
  54
  55     SNDFILE *sndfile;
  56     sf_count_t (*readf_function)(SNDFILE *sndfile, void *ptr, sf_count_t frames);
  57
  58     /* We need this memblockq here to easily fulfill rewind requests
  59      * (even beyond the file start!) */
  60     pa_memblockq *memblockq;
  61 } file_stream;
  62
  63 enum {
  64     FILE_STREAM_MESSAGE_UNLINK
  65 };
  66
  67 PA_DECLARE_CLASS(file_stream);
  68 #define FILE_STREAM(o) (file_stream_cast(o))
  69 static PA_DEFINE_CHECK_TYPE(file_stream, pa_msgobject);
  70
  71 /* Called from main context */
  72 static void file_stream_unlink(file_stream *u) {
  73     pa_assert(u);
  74
  75     if (!u->sink_input)
  76         return;
  77
  78     pa_sink_input_unlink(u->sink_input);
  79     pa_sink_input_unref(u->sink_input);
  80     u->sink_input = NULL;
  81
  82     /* Make sure we don't decrease the ref count twice. */
  83     file_stream_unref(u);
  84 }
  85
  86 /* Called from main context */
  87 static void file_stream_free(pa_object *o) {
  88     file_stream *u = FILE_STREAM(o);
  89     pa_assert(u);
  90
  91     if (u->memblockq)
  92         pa_memblockq_free(u->memblockq);
  93
  94     if (u->sndfile)
  95         sf_close(u->sndfile);
  96
  97     pa_xfree(u);
  98 }
  99
 100 /* Called from main context */
 101 static int file_stream_process_msg(pa_msgobject *o, int code, void*userdata, int64_t offset, pa_memchunk *chunk) {
 102     file_stream *u = FILE_STREAM(o);
 103     file_stream_assert_ref(u);
 104
 105     switch (code) {
 106         case FILE_STREAM_MESSAGE_UNLINK:
 107             file_stream_unlink(u);
 108             break;
 109     }
 110
 111     return 0;
 112 }
 113
 114 /* Called from main context */
 115 static void sink_input_kill_cb(pa_sink_input *i) {
 116     file_stream *u;
 117
 118     pa_sink_input_assert_ref(i);
 119     u = FILE_STREAM(i->userdata);
 120     file_stream_assert_ref(u);
 121
 122     file_stream_unlink(u);
 123 }
 124
 125 /* Called from IO thread context */
 126 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
 127     file_stream *u;
 128
 129     pa_sink_input_assert_ref(i);
 130     u = FILE_STREAM(i->userdata);
 131     file_stream_assert_ref(u);
 132
 133     /* If we are added for the first time, ask for a rewinding so that
 134      * we are heard right-away. */
 135     if (PA_SINK_INPUT_IS_LINKED(state) &&
 136         i->thread_info.state == PA_SINK_INPUT_INIT)
 137         pa_sink_input_request_rewind(i, 0, FALSE, TRUE, TRUE);
 138 }
 139
 140 /* Called from IO thread context */
 141 static int sink_input_pop_cb(pa_sink_input *i, size_t length, pa_memchunk *chunk) {
 142     file_stream *u;
 143
 144     pa_sink_input_assert_ref(i);
 145     pa_assert(chunk);
 146     u = FILE_STREAM(i->userdata);
 147     file_stream_assert_ref(u);
 148
 149     if (!u->memblockq)
 150         return -1;
 151
 152     for (;;) {
 153         pa_memchunk tchunk;
 154         size_t fs;
 155         void *p;
 156         sf_count_t n;
 157
 158         if (pa_memblockq_peek(u->memblockq, chunk) >= 0) {
 159             chunk->length = PA_MIN(chunk->length, length);
 160             pa_memblockq_drop(u->memblockq, chunk->length);
 161             return 0;
 162         }
 163
 164         if (!u->sndfile)
 165             break;
 166
 167         tchunk.memblock = pa_memblock_new(i->sink->core->mempool, length);
 168         tchunk.index = 0;
 169
 170         p = pa_memblock_acquire(tchunk.memblock);
 171
 172         if (u->readf_function) {
 173             fs = pa_frame_size(&i->sample_spec);
 174             n = u->readf_function(u->sndfile, p, (sf_count_t) (length/fs));
 175         } else {
 176             fs = 1;
 177             n = sf_read_raw(u->sndfile, p, (sf_count_t) length);
 178         }
 179
 180         pa_memblock_release(tchunk.memblock);
 181
 182         if (n <= 0) {
 183             pa_memblock_unref(tchunk.memblock);
 184
 185             sf_close(u->sndfile);
 186             u->sndfile = NULL;
 187             break;
 188         }
 189
 190         tchunk.length = (size_t) n * fs;
 191
 192         pa_memblockq_push(u->memblockq, &tchunk);
 193         pa_memblock_unref(tchunk.memblock);
 194     }
 195
 196     if (pa_sink_input_safe_to_remove(i)) {
 197         pa_memblockq_free(u->memblockq);
 198         u->memblockq = NULL;
 199
 200         pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u), FILE_STREAM_MESSAGE_UNLINK, NULL, 0, NULL, NULL);
 201     }
 202
 203     return -1;
 204  }
 205
 206 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
 207     file_stream *u;
 208
 209     pa_sink_input_assert_ref(i);
 210     u = FILE_STREAM(i->userdata);
 211     file_stream_assert_ref(u);
 212
 213     if (!u->memblockq)
 214         return;
 215
 216     pa_memblockq_rewind(u->memblockq, nbytes);
 217 }
 218
 219 static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
 220     file_stream *u;
 221
 222     pa_sink_input_assert_ref(i);
 223     u = FILE_STREAM(i->userdata);
 224     file_stream_assert_ref(u);
 225
 226     if (!u->memblockq)
 227         return;
 228
 229     pa_memblockq_set_maxrewind(u->memblockq, nbytes);
 230 }
 231
 232 int pa_play_file(
 233         pa_sink *sink,
 234         const char *fname,
 235         const pa_cvolume *volume) {
 236
 237     file_stream *u = NULL;
 238     pa_sample_spec ss;
 239     pa_channel_map cm;
 240     pa_sink_input_new_data data;
 241     int fd;
 242     SF_INFO sfi;
 243
 244     pa_assert(sink);
 245     pa_assert(fname);
 246
 247     u = pa_msgobject_new(file_stream);
 248     u->parent.parent.free = file_stream_free;
 249     u->parent.process_msg = file_stream_process_msg;
 250     u->core = sink->core;
 251     u->sink_input = NULL;
 252     u->sndfile = NULL;
 253     u->readf_function = NULL;
 254     u->memblockq = NULL;
 255
 256     if ((fd = open(fname, O_RDONLY
 257 #ifdef O_NOCTTY
 258                    |O_NOCTTY
 259 #endif
 260                    )) < 0) {
 261         pa_log("Failed to open file %s: %s", fname, pa_cstrerror(errno));
 262         goto fail;
 263     }
 264
 265     /* FIXME: For now we just use posix_fadvise to avoid page faults
 266      * when accessing the file data. Eventually we should move the
 267      * file reader into the main event loop and pass the data over the
 268      * asyncmsgq. */
 269
 270 #ifdef HAVE_POSIX_FADVISE
 271     if (posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL) < 0) {
 272         pa_log_warn("POSIX_FADV_SEQUENTIAL failed: %s", pa_cstrerror(errno));
 273         goto fail;
 274     } else
 275         pa_log_debug("POSIX_FADV_SEQUENTIAL succeeded.");
 276
 277     if (posix_fadvise(fd, 0, 0, POSIX_FADV_WILLNEED) < 0) {
 278         pa_log_warn("POSIX_FADV_WILLNEED failed: %s", pa_cstrerror(errno));
 279         goto fail;
 280     } else
 281         pa_log_debug("POSIX_FADV_WILLNEED succeeded.");
 282 #endif
 283
 284     pa_zero(sfi);
 285     if (!(u->sndfile = sf_open_fd(fd, SFM_READ, &sfi, 1))) {
 286         pa_log("Failed to open file %s", fname);
 287         goto fail;
 288     }
 289
 290     fd = -1;
 291
 292     if (pa_sndfile_read_sample_spec(u->sndfile, &ss) < 0) {
 293         pa_log("Failed to determine file sample format.");
 294         goto fail;
 295     }
 296
 297     if (pa_sndfile_read_channel_map(u->sndfile, &cm) < 0) {
 298         if (ss.channels > 2)
 299             pa_log_info("Failed to determine file channel map, synthesizing one.");
 300         pa_channel_map_init_extend(&cm, ss.channels, PA_CHANNEL_MAP_DEFAULT);
 301     }
 302
 303     u->readf_function = pa_sndfile_readf_function(&ss);
 304
 305     pa_sink_input_new_data_init(&data);
 306     data.sink = sink;
 307     data.driver = __FILE__;
 308     pa_sink_input_new_data_set_sample_spec(&data, &ss);
 309     pa_sink_input_new_data_set_channel_map(&data, &cm);
 310     pa_sink_input_new_data_set_volume(&data, volume);
 311     pa_proplist_sets(data.proplist, PA_PROP_MEDIA_NAME, pa_path_get_filename(fname));
 312     pa_proplist_sets(data.proplist, PA_PROP_MEDIA_FILENAME, fname);
 313     pa_sndfile_init_proplist(u->sndfile, data.proplist);
 314
 315     pa_sink_input_new(&u->sink_input, sink->core, &data, 0);
 316     pa_sink_input_new_data_done(&data);
 317
 318     if (!u->sink_input)
 319         goto fail;
 320
 321     u->sink_input->pop = sink_input_pop_cb;
 322     u->sink_input->process_rewind = sink_input_process_rewind_cb;
 323     u->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
 324     u->sink_input->kill = sink_input_kill_cb;
 325     u->sink_input->state_change = sink_input_state_change_cb;
 326     u->sink_input->userdata = u;
 327
 328     u->memblockq = pa_memblockq_new(0, MEMBLOCKQ_MAXLENGTH, 0, pa_frame_size(&ss), 1, 1, 0, NULL);
 329
 330     pa_sink_input_put(u->sink_input);
 331
 332     /* The reference to u is dangling here, because we want to keep
 333      * this stream around until it is fully played. */
 334
 335     return 0;
 336
 337 fail:
 338     if (u)
 339         file_stream_unref(u);
 340
 341     if (fd >= 0)
 342         pa_close(fd);
 343
 344     return -1;
 345 }