Add audio encoding API.

protocols/rdp/Makefile.am

@@ -42,18 +42,29 @@ AM_CFLAGS = -Werror -Wall -Iinclude
 lib_LTLIBRARIES = libguac-client-rdp.la
 freerdp_LTLIBRARIES = guac_rdpsnd.la
 
-libguac_client_rdp_la_SOURCES = src/client.c src/rdp_bitmap.c src/rdp_glyph.c src/rdp_pointer.c src/rdp_gdi.c src/guac_handlers.c src/rdp_cliprdr.c \
-				 src/rdp_keymap.c \
-				 src/rdp_keymap_base.c \
-				 src/rdp_keymap_en_us.c \
-				 src/default_pointer.c
+libguac_client_rdp_la_SOURCES = \
+	src/audio.c            \
+	src/client.c           \
+	src/rdp_bitmap.c       \
+	src/rdp_glyph.c        \
+	src/rdp_pointer.c      \
+	src/rdp_gdi.c          \
+	src/guac_handlers.c    \
+	src/ogg_encoder.c      \
+	src/rdp_cliprdr.c      \
+	src/rdp_keymap.c       \
+	src/rdp_keymap_base.c  \
+	src/rdp_keymap_en_us.c \
+	src/default_pointer.c
 
 guac_rdpsnd_la_SOURCES = guac_rdpsnd/messages.c guac_rdpsnd/service.c
 
 noinst_HEADERS =              \
+	include/audio.h           \
 	include/client.h          \
 	include/default_pointer.h \
 	include/guac_handlers.h   \
+	include/ogg_encoder.h     \
 	include/rdp_bitmap.h      \
 	include/rdp_cliprdr.h     \
 	include/rdp_gdi.h         \

protocols/rdp/include/audio.h

@@ -0,0 +1,156 @@
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is libguac-client-rdp.
+ *
+ * The Initial Developer of the Original Code is
+ * Michael Jumper.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef __GUAC_TEST_AUDIO_H
+#define __GUAC_TEST_AUDIO_H
+
+#include <guacamole/client.h>
+#include <guacamole/stream.h>
+
+typedef struct audio_stream audio_stream;
+
+/**
+ * Handler which is called when the audio stream is opened.
+ */
+typedef void audio_encoder_begin_handler(audio_stream* audio);
+
+/**
+ * Handler which is called when the audio stream is closed.
+ */
+typedef void audio_encoder_end_handler(audio_stream* audio);
+
+/**
+ * Handler which is called when the audio stream is flushed.
+ */
+typedef void audio_encoder_write_handler(audio_stream* audio,
+        int* pcm_data, int length);
+
+/**
+ * Arbitrary audio codec encoder.
+ */
+typedef struct audio_encoder {
+
+    /**
+     * Handler which will be called when the audio stream is opened.
+     */
+    audio_encoder_begin_handler* begin_handler;
+
+    /**
+     * Handler which will be called when the audio stream is flushed.
+     */
+    audio_encoder_write_handler* write_handler;
+
+    /**
+     * Handler which will be called when the audio stream is closed.
+     */
+    audio_encoder_end_handler* end_handler;
+
+} audio_encoder;
+
+/**
+ * Basic audio stream. PCM data is added to the stream. When the stream is
+ * flushed, a write handler receives PCM data packets and, presumably, streams
+ * them to the guac_stream provided.
+ */
+struct audio_stream {
+
+    /**
+     * PCM data buffer, 16-bit samples, 2-channel.
+     */
+    int* pcm_data;
+
+    /**
+     * Number of samples in buffer.
+     */
+    int used;
+
+    /**
+     * Maximum number of samples in buffer.
+     */
+    int length;
+
+    /**
+     * Arbitrary codec encoder. When the PCM buffer is flushed, PCM data will be sent
+     * to this encoder.
+     */
+    audio_encoder* encoder;
+
+    /**
+     * The client associated with this audio stream.
+     */
+    guac_client* client;
+
+    /**
+     * The actual stream associated with this audio stream.
+     */
+    guac_stream* stream;
+
+};
+
+/**
+ * Allocates a new audio stream.
+ */
+audio_stream* audio_stream_alloc(guac_client* client,
+        audio_encoder* encoder);
+
+/**
+ * Frees the given audio stream.
+ */
+void audio_stream_free(audio_stream* stream);
+
+/**
+ * Begins a new audio stream.
+ */
+void audio_stream_begin(audio_stream* stream);
+
+/**
+ * Ends the current audio stream.
+ */
+void audio_stream_end(audio_stream* stream);
+
+/**
+ * Writes PCM data to the given audio stream.
+ */
+void audio_stream_write_pcm(audio_stream* stream, const int* data, int length);
+
+/**
+ * Flushes the given audio stream.
+ */
+void audio_stream_flush(audio_stream* stream);
+
+#endif
+

protocols/rdp/include/ogg_encoder.h

@@ -0,0 +1,46 @@
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is libguac-client-rdp.
+ *
+ * The Initial Developer of the Original Code is
+ * Michael Jumper.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef __GUAC_OGG_ENCODER_H
+#define __GUAC_OGG_ENCODER_H
+
+#include "audio.h"
+
+extern audio_encoder* ogg_encoder;
+
+#endif
+

protocols/rdp/src/audio.c

@@ -0,0 +1,115 @@
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is libguac-client-rdp.
+ *
+ * The Initial Developer of the Original Code is
+ * Michael Jumper.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include <stdlib.h>
+#include <string.h>
+#include <guacamole/protocol.h>
+#include <guacamole/client.h>
+#include <guacamole/stream.h>
+
+#include "audio.h"
+
+audio_stream* audio_stream_alloc(guac_client* client, audio_encoder* encoder) {
+
+    /* Allocate stream */
+    audio_stream* audio = (audio_stream*) malloc(sizeof(audio_stream));
+
+    /* Reset buffer stats */
+    audio->used = 0;
+    audio->length = 0x40000;
+
+    /* Allocate buffer */
+    audio->pcm_data = malloc(sizeof(int) * audio->length);
+
+    /* Assign encoder */
+    audio->encoder = encoder;
+    audio->stream = guac_client_alloc_stream(client);
+
+    return audio;
+}
+
+void audio_stream_begin(audio_stream* audio) {
+    audio->encoder->begin_handler(audio);
+}
+
+void audio_stream_end(audio_stream* audio) {
+    audio_stream_flush(audio);
+    audio->encoder->end_handler(audio);
+}
+
+void audio_stream_free(audio_stream* audio) {
+    free(audio->pcm_data);
+    free(audio);
+}
+
+void audio_stream_write_pcm(audio_stream* audio, const int* data, int length) {
+
+    /* Resize audio buffer if necessary */
+    if (length > audio->length) {
+
+        /* Resize to double provided length */
+        audio->length = length*2;
+        audio->pcm_data = realloc(audio, sizeof(int) * audio->length);
+
+    }
+
+    /* Flush if necessary */
+    if (audio->used + length > audio->length)
+        audio_stream_flush(audio);
+
+    /* Append to buffer */
+    memcpy(&(audio->pcm_data[audio->used]), data, sizeof(int) * length);
+    audio->used += length;
+
+}
+
+void audio_stream_flush(audio_stream* audio) {
+
+    /* If data in buffer */
+    if (audio->used != 0) {
+
+        /* Write data */
+        audio->encoder->write_handler(audio,
+                audio->pcm_data, audio->used);
+
+        /* Reset buffer */
+        audio->used = 0;
+
+    }
+
+}
+

protocols/rdp/src/ogg_encoder.c

@@ -0,0 +1,74 @@
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is libguac-client-rdp.
+ *
+ * The Initial Developer of the Original Code is
+ * Michael Jumper.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include <guacamole/client.h>
+#include <guacamole/protocol.h>
+
+#include "audio.h"
+
+void ogg_encoder_begin_handler(audio_stream* audio) {
+
+    guac_client_log_info(audio->client,
+            "OGG: Beginning audio stream.");
+
+}
+
+void ogg_encoder_end_handler(audio_stream* audio) {
+
+    guac_client_log_info(audio->client,
+            "OGG: Ending audio stream.");
+
+}
+
+void ogg_encoder_write_handler(audio_stream* audio, int* pcm_data, int length) {
+
+    guac_client_log_info(audio->client,
+            "OGG: Writing data to stream, length=%i",
+            length);
+
+}
+
+/* Encoder handlers */
+audio_encoder _ogg_encoder = {
+    .begin_handler = ogg_encoder_begin_handler,
+    .write_handler = ogg_encoder_write_handler,
+    .end_handler   = ogg_encoder_end_handler
+};
+
+/* Actual encoder */
+audio_encoder* ogg_encoder = &_ogg_encoder;
+