herrie/src/audio_output_pulse.c

   1 /*
   2  * Copyright (c) 2006-2011 Ed Schouten <ed@80386.nl>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26 /**
  27  * @file audio_output_pulse.c
  28  * @brief PulseAudio audio output driver.
  29  */
  30
  31 #include "stdinc.h"
  32
  33 #include <pulse/simple.h>
  34
  35 #include "audio_file.h"
  36 #include "audio_output.h"
  37 #include "gui.h"
  38
  39 /**
  40  * @brief Handle to an audio device handle if one has already been opened.
  41  */
  42 static pa_simple*       devptr = NULL;
  43 /**
  44  * @brief Format of the current open audio device handle.
  45  */
  46 static pa_sample_spec   devfmt = { PA_SAMPLE_S16LE, 0, 0 };
  47
  48 int
  49 audio_output_open(void)
  50 {
  51         return (0);
  52 }
  53
  54 int
  55 audio_output_play(struct audio_file *fd)
  56 {
  57         int16_t buf[2048];
  58         size_t len;
  59
  60         if ((len = audio_file_read(fd, buf, sizeof buf / sizeof(int16_t))) == 0)
  61                 return (-1);
  62
  63         if (devfmt.rate != fd->srate || devfmt.channels != fd->channels) {
  64                 /* Sample rate or amount of channels has changed */
  65                 audio_output_close();
  66
  67                 devfmt.rate = fd->srate;
  68                 devfmt.channels = fd->channels;
  69         }
  70
  71         if (devptr == NULL) {
  72                 /* Open the device */
  73                 devptr = pa_simple_new(NULL, APP_NAME,
  74                     PA_STREAM_PLAYBACK, NULL, "Audio output", &devfmt,
  75                     NULL, NULL, NULL);
  76                 if (devptr == NULL) {
  77                         gui_msgbar_warn(_("Cannot open the audio device."));
  78                         return (-1);
  79                 }
  80         }
  81
  82         if (pa_simple_write(devptr, buf, len * sizeof(int16_t), NULL) != 0) {
  83                 /* No success - device must be closed */
  84                 audio_output_close();
  85                 return (-1);
  86         }
  87
  88         return (0);
  89 }
  90
  91 void
  92 audio_output_close(void)
  93 {
  94         if (devptr != NULL) {
  95                 /* Close device */
  96                 pa_simple_free(devptr);
  97                 devptr = NULL;
  98         }
  99 }