X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/e8c185c3c5870f21f8352c9684e6feb9c1ef37a5..a2364abbe6ed9e8e4dd71b9410f985acbf20b18f:/lib/uaudio.c

diff --git a/lib/uaudio.c b/lib/uaudio.c
index 266846e..a9ac103 100644
--- a/lib/uaudio.c
+++ b/lib/uaudio.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of DisOrder.
- * Copyright (C) 2009 Richard Kettlewell
+ * Copyright (C) 2009, 2013 Richard Kettlewell
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -11,7 +11,7 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
@@ -24,6 +24,7 @@
 #include "uaudio.h"
 #include "hash.h"
 #include "mem.h"
+#include "log.h"
 
 /** @brief Options for chosen uaudio API */
 static hash *uaudio_options;
@@ -40,6 +41,9 @@ int uaudio_channels;
 /** @brief Whether samples are signed or unsigned */
 int uaudio_signed;
 
+/** @brief Frames of buffer to tolerate inside chosen API */
+int uaudio_buffer;
+
 /** @brief Sample size in bytes
  *
  * NB one sample is a single point sample; up to @c uaudio_channels samples may
@@ -50,21 +54,28 @@ size_t uaudio_sample_size;
 
 /** @brief Set a uaudio option */
 void uaudio_set(const char *name, const char *value) {
+  if(!value) {
+    if(uaudio_options)
+      hash_remove(uaudio_options, name);
+    return;
+  }
   if(!uaudio_options)
     uaudio_options = hash_new(sizeof(char *));
   value = xstrdup(value);
   hash_add(uaudio_options, name, &value, HASH_INSERT_OR_REPLACE);
 }
 
-/** @brief Set a uaudio option */
-char *uaudio_get(const char *name) {
-  const char *value = (uaudio_options ?
-                       *(char **)hash_find(uaudio_options, name)
-                       : NULL);
-  return value ? xstrdup(value) : NULL;
+/** @brief Get a uaudio option */
+char *uaudio_get(const char *name, const char *default_value) {
+  if(!uaudio_options)
+    return default_value ? xstrdup(default_value) : 0;
+  char **valuep = hash_find(uaudio_options, name);
+  if(!valuep)
+    return default_value ? xstrdup(default_value) : 0;
+  return xstrdup(*valuep);
 }
 
-/** @brief Set sample format 
+/** @brief Set sample format
  * @param rate Sample rate in KHz
  * @param channels Number of channels (i.e. 2 for stereo)
  * @param bits Number of bits per channel (typically 8 or 16)
@@ -89,27 +100,20 @@ void uaudio_set_format(int rate, int channels, int bits, int signed_) {
   uaudio_sample_size = bits / CHAR_BIT;
 }
 
-/** @brief List of known APIs
- *
- * Terminated by a null pointer.
- *
- * The first one will be used as a default, so putting ALSA before OSS
- * constitutes a policy decision.
+/** @brief Choose the default audio API by context
+ * @param apis Table of APIs or a null pointer
+ * @param context @ref UAUDIO_API_SERVER or @ref UAUDIO_API_CLIENT
+ * @return Default API or a null pointer
  */
-const struct uaudio *uaudio_apis[] = {
-#if HAVE_COREAUDIO_AUDIOHARDWARE_H
-  &uaudio_coreaudio,
-#endif  
-#if HAVE_ALSA_ASOUNDLIB_H
-  &uaudio_alsa,
-#endif
-#if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST
-  &uaudio_oss,
-#endif
-  &uaudio_rtp,
-  &uaudio_command,
-  NULL,
-};
+const struct uaudio *uaudio_default(const struct uaudio *const *apis,
+                                    unsigned context) {
+  if(apis) {
+    for(int n = 0; apis[n]; ++n)
+      if(apis[n]->flags & context)
+        return apis[n];
+  }
+  return 0;
+}
 
 /*
 Local Variables: