-implement microphone library

4 files changed, 272 insertions, 62 deletions

diff --git a/src/conversation/Makefile.am b/src/conversation/Makefile.am
index 895e1136e..ac2f47612 100644
--- a/src/conversation/Makefile.am
+++ b/src/conversation/Makefile.am
@@ -14,17 +14,32 @@ AM_CPPFLAGS = \
 #   $(WINFLAGS) \
 #   -export-dynamic
 
-lib_LTLIBRARIES = libgnunetconversation.la
+lib_LTLIBRARIES = \
+ libgnunetmicrophone.la \
+ libgnunetconversation.la
 
 pkgcfgdir= $(prefix)/share/gnunet/config.d/
 
 libexecdir= $(prefix)/lib/gnunet/libexec/
 
+libgnunetmicrophone_la_SOURCES = \
+  microphone.c 
+libgnunetmicrophone_la_LIBADD = \
+  -lgnunetutil
+libgnunetmicrophone_la_LDFLAGS = \
+  $(GNUNET_LDFLAGS)  $(WINFLAGS) \
+  -version-info 0:0:0
+
+
 libgnunetconversation_la_SOURCES = \
   conversation_api.c \
   conversation_api2.c 
 libgnunetconversation_la_LIBADD = \
-  -lgnunetutil -lgnunetnamestore -lgnunetgns
+  libgnunetmicrophone.la \
+  $(top_builddir)/src/gns/libgnunetgns.la \
+  $(top_builddir)/src/namestore/libgnunetnamestore.la \
+  $(top_builddir)/src/util/libgnunetutil.la 
+
 libgnunetconversation_la_LDFLAGS = \
   $(GNUNET_LDFLAGS)  $(WINFLAGS) \
   -version-info 0:0:0
diff --git a/src/conversation/conversation.h b/src/conversation/conversation.h
index cc36ca739..91630d8c2 100644
--- a/src/conversation/conversation.h
+++ b/src/conversation/conversation.h
@@ -396,10 +396,10 @@ struct AudioMessage
    * Type is #GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO
    */
   struct GNUNET_MessageHeader header;
-  int SequenceNumber;
+  int32_t SequenceNumber;
   struct GNUNET_TIME_Absolute time;
-  int length;
-  int encrypted;
+  int32_t length;
+  int32_t encrypted;
   uint8_t audio[200];
 
 };
diff --git a/src/conversation/gnunet-helper-audio-record.c b/src/conversation/gnunet-helper-audio-record.c
index a6b97278b..5d4c0399a 100644
--- a/src/conversation/gnunet-helper-audio-record.c
+++ b/src/conversation/gnunet-helper-audio-record.c
@@ -38,9 +38,10 @@
 #include <opus/opus.h>
 #include <opus/opus_types.h>
 
+
 /**
-* Specification for recording. May change in the future to spec negotiation.
-*/
+ * Specification for recording. May change in the future to spec negotiation.
+ */
 static pa_sample_spec sample_spec = {
   .format = PA_SAMPLE_FLOAT32LE,
   .rate = 48000,
@@ -48,90 +49,89 @@ static pa_sample_spec sample_spec = {
 };
 
 /**
-* Pulseaudio mainloop api
-*/
-static pa_mainloop_api *mainloop_api = NULL;
+ * Pulseaudio mainloop api
+ */
+static pa_mainloop_api *mainloop_api;
 
 /**
-* Pulseaudio mainloop
-*/
-static pa_mainloop *m = NULL;
+ * Pulseaudio mainloop
+ */
+static pa_mainloop *m;
 
 /**
-* Pulseaudio context
-*/
-static pa_context *context = NULL;
+ * Pulseaudio context
+ */
+static pa_context *context;
 
 /**
-* Pulseaudio recording stream
-*/
-static pa_stream *stream_in = NULL;
+ * Pulseaudio recording stream
+ */
+static pa_stream *stream_in;
 
 /**
-* Pulseaudio io events
-*/
-static pa_io_event *stdio_event = NULL;
+ * Pulseaudio io events
+ */
+static pa_io_event *stdio_event;
 
 /**
-* Message tokenizer
-*/
-struct MessageStreamTokenizer *stdin_mst;
+ * Message tokenizer
+ */
+static struct MessageStreamTokenizer *stdin_mst;
 
 /**
-* OPUS encoder
-*/
-OpusEncoder *enc = NULL;
+ * OPUS encoder
+ */
+static OpusEncoder *enc;
 
 /**
-*
-*/
-unsigned char *opus_data;
+ *
+ */
+static unsigned char *opus_data;
 
 /**
-* PCM data buffer for one OPUS frame
-*/
-float *pcm_buffer;
+ * PCM data buffer for one OPUS frame
+ */
+static float *pcm_buffer;
 
 /**
  * Length of the pcm data needed for one OPUS frame 
  */
-int pcm_length;
+static int pcm_length;
 
 /**
-* Number of samples for one frame
-*/
-int frame_size;
+ * Number of samples for one frame
+ */
+static int frame_size;
 
 /**
 * Maximum length of opus payload
 */
-int max_payload_bytes = 1500;
+static int max_payload_bytes = 1500;
 
 /**
-* Audio buffer
-*/
-static void *transmit_buffer = NULL;
+ * Audio buffer
+ */
+static void *transmit_buffer;
 
 /**
-* Length of audio buffer
-*/
-static size_t transmit_buffer_length = 0;
+ * Length of audio buffer
+ */
+static size_t transmit_buffer_length;
 
 /**
-* Read index for transmit buffer
-*/
-static size_t transmit_buffer_index = 0;
+ * Read index for transmit buffer
+ */
+static size_t transmit_buffer_index;
 
 /**
-* Audio message skeleton
-*/
-struct AudioMessage *audio_message;
-
+ * Audio message skeleton
+ */
+static struct AudioMessage *audio_message;
 
 
 /**
-* Pulseaudio shutdown task
-*/
+ * Pulseaudio shutdown task
+ */
 static void
 quit (int ret)
 {
@@ -140,18 +140,14 @@ quit (int ret)
 }
 
 
-
 /**
-* Creates OPUS packets from PCM data
-*/
+ * Creates OPUS packets from PCM data
+ */
 static void
 packetizer ()
 {
-
-
   while (transmit_buffer_length >= transmit_buffer_index + pcm_length)
-    {
-
+  {
       int ret;
       int len;
 
@@ -450,11 +446,11 @@ opus_init ()
   opus_data = (unsigned char *) calloc (max_payload_bytes, sizeof (char));
 
   audio_message = pa_xmalloc (sizeof (struct AudioMessage));
-
   audio_message->header.size = htons (sizeof (struct AudioMessage));
   audio_message->header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO);
 }
 
+
 /**
  * The main function for the record helper.
  *
diff --git a/src/conversation/microphone.c b/src/conversation/microphone.c
new file mode 100644
index 000000000..8e9b9e241
--- /dev/null
+++ b/src/conversation/microphone.c
@@ -0,0 +1,199 @@
+/*
+  This file is part of GNUnet
+  (C) 2013 Christian Grothoff (and other contributing authors)
+  
+  GNUnet is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3, or (at your
+  option) any later version.
+  
+  GNUnet is distributed in the hope that it will be useful, 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 GNUnet; see the file COPYING.  If not, write to the
+  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+  Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * @file conversation/microphone.c
+ * @brief API to access an audio microphone; provides access to hardware microphones;
+ *        actually just wraps the gnunet-helper-audio-record
+ * @author Simon Dieterle
+ * @author Andreas Fuchs
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_microphone_lib.h"
+#include "conversation.h"
+
+
+/**
+ * Internal data structures for the microphone.
+ */
+struct Microphone
+{
+
+  /**
+   * Our configuration.
+   */
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+  /**
+   * Handle for the record helper
+   */
+  struct GNUNET_HELPER_Handle *record_helper;
+
+  /**
+   * Function to call with audio data (if we are enabled).
+   */
+  GNUNET_MICROPHONE_RecordedDataCallback rdc;
+
+  /**
+   * Closure for @e rdc.
+   */
+  void *rdc_cls;
+
+};
+
+
+/**
+ * Function to process the audio from the record helper
+ *
+ * @param cls clsoure with our `struct Microphone`
+ * @param client NULL
+ * @param msg the message from the helper
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+process_record_messages (void *cls,
+                         void *client,
+                         const struct GNUNET_MessageHeader *msg)
+{
+  struct Microphone *mic = cls;
+
+  if ( (ntohs (msg->size) != sizeof (struct AudioMessage)) ||
+       (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO) )
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  mic->rdc (mic->rdc_cls,
+            sizeof (struct AudioMessage),
+            (const char *) msg);
+  return GNUNET_OK;
+}
+
+
+/**
+ * Enable a microphone.
+ *
+ * @param cls clsoure with our `struct Microphone`
+ * @param rdc function to call with recorded data
+ * @param rdc_cls closure for @a dc
+ */
+static int
+enable (void *cls,
+        GNUNET_MICROPHONE_RecordedDataCallback rdc,
+        void *rdc_cls)
+{
+  struct Microphone *mic = cls;  
+  char * const record_helper_argv[] = 
+  {
+    "gnunet-helper-audio-record",
+    NULL
+  };
+  mic->rdc = rdc;
+  mic->rdc_cls = rdc_cls;
+  mic->record_helper = GNUNET_HELPER_start (GNUNET_NO,
+                                            "gnunet-helper-audio-record",
+                                            record_helper_argv,
+                                            &process_record_messages, 
+                                            NULL, mic);  
+  if (NULL == mic->record_helper)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("Could not start record audio helper\n"));
+    return GNUNET_SYSERR;
+  }  
+  return GNUNET_OK;
+}
+
+
+/**
+ * Function that disables a microphone.
+ *
+ * @param cls clsoure
+ */
+static void
+disable (void *cls)
+{
+  struct Microphone *mic = cls;
+
+  if (NULL == mic->record_helper)
+  {
+    GNUNET_break (0);
+    return;
+  }
+  GNUNET_break (GNUNET_OK ==
+                GNUNET_HELPER_kill (mic->record_helper, GNUNET_NO));
+  GNUNET_HELPER_destroy (mic->record_helper);
+  mic->record_helper = NULL;
+}
+
+
+/**
+ * Function to destroy a microphone.
+ *
+ * @param cls clsoure
+ */
+static void
+destroy (void *cls)
+{
+  struct Microphone *mic = cls;
+
+  if (NULL != mic->record_helper)
+    disable (mic);
+}
+
+
+/**
+ * Create a microphone that corresponds to the microphone hardware
+ * of our system.
+ *
+ * @param cfg configuration to use
+ * @return NULL on error
+ */
+struct GNUNET_MICROPHONE_Handle *
+GNUNET_MICROPHONE_create_from_hardware (const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  struct GNUNET_MICROPHONE_Handle *microphone;
+  struct Microphone *mic;
+
+  mic = GNUNET_new (struct Microphone);
+  mic->cfg = cfg;
+  microphone = GNUNET_new (struct GNUNET_MICROPHONE_Handle);
+  microphone->cls = mic;
+  microphone->enable_microphone = &enable;
+  microphone->disable_microphone = &disable;
+  microphone->destroy_microphone = &destroy;
+  return microphone;
+}
+
+
+/**
+ * Destroy a microphone.
+ *
+ * @param microphone microphone to destroy
+ */
+void
+GNUNET_MICROPHONE_destroy (struct GNUNET_MICROPHONE_Handle *microphone)
+{
+  microphone->destroy_microphone (microphone->cls);
+  GNUNET_free (microphone);
+}
+
+/* end of microphone.c */