herrie/src/audio_output_ao.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_ao.c
  28  * @brief libao audio output driver.
  29  */
  30
  31 #include "stdinc.h"
  32
  33 #include <ao/ao.h>
  34
  35 #include "audio_file.h"
  36 #include "audio_output.h"
  37 #include "config.h"
  38 #include "gui.h"
  39
  40 /**
  41  * @brief Handle to an audio device handle if one has already been opened.
  42  */
  43 static ao_device*       devptr = NULL;
  44 /**
  45  * @brief Format of the current open audio device handle.
  46  */
  47 static ao_sample_format devfmt;
  48 /**
  49  * @brief Default options that should be prepended when opening the
  50  *        audio device.
  51  */
  52 static ao_option        *devopt = NULL;
  53
  54 int
  55 audio_output_open(void)
  56 {
  57         const char *host;
  58         char *henv, *hend;
  59
  60         ao_initialize();
  61
  62         /* We always expect 16 bits native endian PCM */
  63         devfmt.bits = 16;
  64         devfmt.byte_format = AO_FMT_NATIVE;
  65
  66         host = config_getopt("audio.output.ao.host");
  67         if (strcmp(host, "env_ssh") == 0) {
  68                 /* Fetch "host" option from SSH_CLIENT variable */
  69                 henv = g_strdup(getenv("SSH_CLIENT"));
  70                 if (henv != NULL) {
  71                         /* Remove the trailing port number */
  72                         if ((hend = strchr(henv, ' ')) != NULL)
  73                                 *hend = '\0';
  74                         ao_append_option(&devopt, "host", henv);
  75                         g_free(henv);
  76                 }
  77         } else if (host[0] != '\0') {
  78                 /* Use the value as the hostname */
  79                 ao_append_option(&devopt, "host", host);
  80         }
  81
  82         return (0);
  83 }
  84
  85 int
  86 audio_output_play(struct audio_file *fd)
  87 {
  88         const char *drvname;
  89         int16_t buf[2048];
  90         int len, drvnum;
  91
  92         if ((len = audio_file_read(fd, buf, sizeof buf / sizeof(int16_t))) == 0)
  93                 return (-1);
  94
  95         if ((unsigned int)devfmt.rate != fd->srate ||
  96             (unsigned int)devfmt.channels != fd->channels) {
  97                 /* Sample rate or amount of channels has changed */
  98                 audio_output_close();
  99
 100                 devfmt.rate = fd->srate;
 101                 devfmt.channels = fd->channels;
 102         }
 103
 104         if (devptr == NULL) {
 105                 drvname = config_getopt("audio.output.ao.driver");
 106                 if (drvname[0] != '\0') {
 107                         /* User specified driver */
 108                         drvnum = ao_driver_id(drvname);
 109                 } else {
 110                         /* Default driver */
 111                         drvnum = ao_default_driver_id();
 112                 }
 113
 114                 devptr = ao_open_live(drvnum, &devfmt, devopt);
 115                 if (devptr == NULL) {
 116                         gui_msgbar_warn(_("Cannot open the audio device."));
 117                         return (-1);
 118                 }
 119         }
 120
 121         if (ao_play(devptr, (char *)buf, len * sizeof(int16_t)) == 0) {
 122                 /* No success - device must be closed */
 123                 audio_output_close();
 124                 return (-1);
 125         }
 126
 127         return (0);
 128 }
 129
 130 void
 131 audio_output_close(void)
 132 {
 133         if (devptr != NULL) {
 134                 /* Close device */
 135                 ao_close(devptr);
 136                 devptr = NULL;
 137         }
 138 }