First commit of actual A/V code for group chats.

3 files changed, 275 insertions, 0 deletions

diff --git a/toxav/Makefile.inc b/toxav/Makefile.inc
index de8ef8ff..0b4b869d 100644
--- a/toxav/Makefile.inc
+++ b/toxav/Makefile.inc
@@ -8,6 +8,8 @@ libtoxav_la_SOURCES = ../toxav/rtp.h \
                       ../toxav/rtp.c \
                       ../toxav/msi.h \
                       ../toxav/msi.c \
+                      ../toxav/group.h \
+                      ../toxav/group.c \
                       ../toxav/codec.h \
                       ../toxav/codec.c \
                       ../toxav/toxav.h \
diff --git a/toxav/group.c b/toxav/group.c
new file mode 100644
index 00000000..503adc57
--- /dev/null
+++ b/toxav/group.c
@@ -0,0 +1,241 @@
+/**  groupav.h
+ *
+ *   Copyright (C) 2014 Tox project All Rights Reserved.
+ *
+ *   This file is part of Tox.
+ *
+ *   Tox 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 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "group.h"
+#include "../toxcore/logger.h"
+
+typedef struct {
+    uint16_t sequnum;
+    uint16_t length;
+    uint8_t data[];
+} Group_Audio_Packet;
+
+typedef struct {
+    Group_Audio_Packet **queue;
+    uint32_t size;
+    uint32_t capacity;
+    uint16_t bottom;
+    uint16_t top;
+} Group_JitterBuffer;
+
+static Group_JitterBuffer *create_queue(unsigned int capacity)
+{
+    unsigned int size = 1;
+
+    while (size <= capacity) {
+        size *= 2;
+    }
+
+    Group_JitterBuffer *q;
+
+    if ( !(q = calloc(sizeof(Group_JitterBuffer), 1)) ) return NULL;
+
+    if (!(q->queue = calloc(sizeof(Group_Audio_Packet *), size))) {
+        free(q);
+        return NULL;
+    }
+
+    q->size = size;
+    q->capacity = capacity;
+    return q;
+}
+
+static void clear_queue(Group_JitterBuffer *q)
+{
+    for (; q->bottom != q->top; ++q->bottom) {
+        if (q->queue[q->bottom % q->size]) {
+            free(q->queue[q->bottom % q->size]);
+            q->queue[q->bottom % q->size] = NULL;
+        }
+    }
+}
+
+static void terminate_queue(Group_JitterBuffer *q)
+{
+    if (!q) return;
+
+    clear_queue(q);
+    free(q->queue);
+    free(q);
+}
+
+static void queue(Group_JitterBuffer *q, Group_Audio_Packet *pk)
+{
+    uint16_t sequnum = pk->sequnum;
+
+    unsigned int num = sequnum % q->size;
+
+    if ((uint32_t)(sequnum - q->bottom) > q->size) {
+        clear_queue(q);
+        q->bottom = sequnum;
+        q->queue[num] = pk;
+        q->top = sequnum + 1;
+        return;
+    }
+
+    if (q->queue[num])
+        return;
+
+    q->queue[num] = pk;
+
+    if ((sequnum - q->bottom) >= (q->top - q->bottom))
+        q->top = sequnum + 1;
+}
+
+/* success is 0 when there is nothing to dequeue, 1 when there's a good packet, 2 when there's a lost packet */
+static Group_Audio_Packet *dequeue(Group_JitterBuffer *q, int *success)
+{
+    if (q->top == q->bottom) {
+        *success = 0;
+        return NULL;
+    }
+
+    unsigned int num = q->bottom % q->size;
+
+    if (q->queue[num]) {
+        Group_Audio_Packet *ret = q->queue[num];
+        q->queue[num] = NULL;
+        ++q->bottom;
+        *success = 1;
+        return ret;
+    }
+
+    if ((uint32_t)(q->top - q->bottom) > q->capacity) {
+        ++q->bottom;
+        *success = 2;
+        return NULL;
+    }
+
+    *success = 0;
+    return NULL;
+}
+
+
+typedef struct {
+    OpusEncoder *audio_encoder;
+
+    unsigned int audio_channels, audio_sample_rate, audio_bitrate;
+} Group_AV;
+
+typedef struct {
+    Group_JitterBuffer *buffer;
+
+    OpusDecoder *audio_decoder;
+} Group_Peer_AV;
+
+static void kill_group_av(Group_AV *group_av)
+{
+    opus_encoder_destroy(group_av->audio_encoder);
+    free(group_av);
+}
+
+static Group_AV *new_group_av(unsigned int audio_channels, unsigned int audio_sample_rate, unsigned int audio_bitrate)
+{
+    Group_AV *group_av = calloc(1, sizeof(Group_AV));
+
+    int rc = OPUS_OK;
+    group_av->audio_encoder = opus_encoder_create(audio_sample_rate, audio_channels, OPUS_APPLICATION_AUDIO, &rc);
+
+    if ( rc != OPUS_OK ) {
+        LOGGER_ERROR("Error while starting audio encoder: %s", opus_strerror(rc));
+        free(group_av);
+        return NULL;
+    }
+
+    rc = opus_encoder_ctl(group_av->audio_encoder, OPUS_SET_BITRATE(audio_bitrate));
+
+    if ( rc != OPUS_OK ) {
+        LOGGER_ERROR("Error while setting encoder ctl: %s", opus_strerror(rc));
+        opus_encoder_destroy(group_av->audio_encoder);
+        free(group_av);
+        return NULL;
+    }
+
+    rc = opus_encoder_ctl(group_av->audio_encoder, OPUS_SET_COMPLEXITY(10));
+
+    if ( rc != OPUS_OK ) {
+        LOGGER_ERROR("Error while setting encoder ctl: %s", opus_strerror(rc));
+        opus_encoder_destroy(group_av->audio_encoder);
+        free(group_av);
+        return NULL;
+    }
+
+    group_av->audio_channels = audio_channels;
+    group_av->audio_sample_rate = audio_sample_rate;
+    group_av->audio_bitrate = audio_bitrate;
+    return 0;
+}
+
+static void group_av_peer_new(void *object, int groupnumber, int friendgroupnumber)
+{
+
+
+}
+
+static void group_av_peer_delete(void *object, int groupnumber, int friendgroupnumber, void *peer_object)
+{
+
+
+}
+
+static int groupchat_enable_av(Group_Chats *g_c, int groupnumber)
+{
+    Group_AV *group_av = new_group_av(1, 48000, 64000); //TODO: Use variables instead.
+
+    if (group_av == NULL) {
+        return -1;
+    }
+
+    if (group_set_object(g_c, groupnumber, group_av) == -1
+            || callback_groupchat_peer_new(g_c, groupnumber, group_av_peer_new) == -1
+            || callback_groupchat_peer_delete(g_c, groupnumber, group_av_peer_delete) == -1) {
+        kill_group_av(group_av);
+        return -1;
+    }
+
+    return 0;
+}
+
+/* Create a new toxav group.
+ *
+ * return group number on success.
+ * return -1 on failure.
+ */
+int add_av_groupchat(Group_Chats *g_c)
+{
+    int groupnumber = add_groupchat(g_c);
+
+    if (groupnumber == -1) {
+        return -1;
+    }
+
+    if (groupchat_enable_av(g_c, groupnumber) == -1) {
+        del_groupchat(g_c, groupnumber);
+        return -1;
+    }
+
+    return groupnumber;
+}
+
+
diff --git a/toxav/group.h b/toxav/group.h
new file mode 100644
index 00000000..19bb0483
--- /dev/null
+++ b/toxav/group.h
@@ -0,0 +1,32 @@
+/**  groupav.c
+ *
+ *   Copyright (C) 2014 Tox project All Rights Reserved.
+ *
+ *   This file is part of Tox.
+ *
+ *   Tox 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 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Audio encoding/decoding */
+#include <opus.h>
+
+#include "../toxcore/group.h"
+
+/* Create a new toxav group.
+ *
+ * return group number on success.
+ * return -1 on failure.
+ */
+int add_av_groupchat(Group_Chats *g_c);
+