1 files changed, 309 insertions, 0 deletions

diff --git a/toxav/media.c b/toxav/media.c
new file mode 100644
index 00000000..c4894076
--- /dev/null
+++ b/toxav/media.c
@@ -0,0 +1,309 @@
+/**  media.c
+ * 
+ *   Audio and video codec intitialization, encoding/decoding and playback
+ *
+ *   Copyright (C) 2013 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 /* HAVE_CONFIG_H */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <assert.h>
+
+#include "rtp.h"
+#include "media.h"
+
+struct jitter_buffer {
+    RTPMessage **queue;
+    uint16_t capacity;
+    uint16_t size;
+    uint16_t front;
+    uint16_t rear;
+    uint8_t queue_ready;
+    uint16_t current_id;
+    uint32_t current_ts;
+    uint8_t id_set;
+};
+
+
+struct jitter_buffer *create_queue(int capacity)
+{
+    struct jitter_buffer *q;
+    q = (struct jitter_buffer *)calloc(sizeof(struct jitter_buffer),1);
+    q->queue = (RTPMessage **)calloc(sizeof(RTPMessage*), capacity);
+    int i = 0;
+
+    for (i = 0; i < capacity; ++i) {
+        q->queue[i] = NULL;
+    }
+
+    q->size = 0;
+    q->capacity = capacity;
+    q->front = 0;
+    q->rear = -1;
+    q->queue_ready = 0;
+    q->current_id = 0;
+    q->current_ts = 0;
+    q->id_set = 0;
+    return q;
+}
+
+/* returns 1 if 'a' has a higher sequence number than 'b' */
+uint8_t sequence_number_older(uint16_t sn_a, uint16_t sn_b, uint32_t ts_a, uint32_t ts_b)
+{
+    /* TODO: There is already this kind of function in toxrtp.c.
+     *       Maybe merge?
+     */
+    return (sn_a > sn_b || ts_a > ts_b);
+}
+
+/* success is 0 when there is nothing to dequeue, 1 when there's a good packet, 2 when there's a lost packet */
+RTPMessage *dequeue(struct jitter_buffer *q, int *success)
+{
+    if (q->size == 0 || q->queue_ready == 0) {
+        q->queue_ready = 0;
+        *success = 0;
+        return NULL;
+    }
+
+    int front = q->front;
+
+    if (q->id_set == 0) {
+        q->current_id = q->queue[front]->header->sequnum;
+        q->current_ts = q->queue[front]->header->timestamp;
+        q->id_set = 1;
+    } else {
+        int next_id = q->queue[front]->header->sequnum;
+        int next_ts = q->queue[front]->header->timestamp;
+
+        /* if this packet is indeed the expected packet */
+        if (next_id == (q->current_id + 1) % MAX_SEQU_NUM) {
+            q->current_id = next_id;
+            q->current_ts = next_ts;
+        } else {
+            if (sequence_number_older(next_id, q->current_id, next_ts, q->current_ts)) {
+                printf("nextid: %d current: %d\n", next_id, q->current_id);
+                q->current_id = (q->current_id + 1) % MAX_SEQU_NUM;
+                *success = 2; /* tell the decoder the packet is lost */
+                return NULL;
+            } else {
+                /* packet too old */
+                printf("packet too old\n");
+                *success = 0;
+                return NULL;
+            }
+        }
+    }
+
+    q->size--;
+    q->front++;
+
+    if (q->front == q->capacity)
+        q->front = 0;
+
+    *success = 1;
+    q->current_id = q->queue[front]->header->sequnum;
+    q->current_ts = q->queue[front]->header->timestamp;
+    return q->queue[front];
+}
+
+int empty_queue(struct jitter_buffer *q)
+{
+    while (q->size > 0) {
+        q->size--;
+        rtp_free_msg(NULL, q->queue[q->front]);
+        q->front++;
+
+        if (q->front == q->capacity)
+            q->front = 0;
+    }
+
+    q->id_set = 0;
+    q->queue_ready = 0;
+    return 0;
+}
+
+int queue(struct jitter_buffer *q, RTPMessage *pk)
+{
+    if (q->size == q->capacity) {
+        printf("buffer full, emptying buffer...\n");
+        empty_queue(q);
+        return 0;
+    }
+
+    if (q->size > 8)
+        q->queue_ready = 1;
+
+    ++q->size;
+    ++q->rear;
+
+    if (q->rear == q->capacity)
+        q->rear = 0;
+
+    q->queue[q->rear] = pk;
+
+    int a;
+    int b;
+    int j;
+    a = q->rear;
+
+    for (j = 0; j < q->size - 1; ++j) {
+        b = a - 1;
+
+        if (b < 0)
+            b += q->capacity;
+
+        if (sequence_number_older(q->queue[b]->header->sequnum, q->queue[a]->header->sequnum,
+                                  q->queue[b]->header->timestamp, q->queue[a]->header->timestamp)) {
+            RTPMessage *temp;
+            temp = q->queue[a];
+            q->queue[a] = q->queue[b];
+            q->queue[b] = temp;
+            printf("had to swap\n");
+        } else {
+            break;
+        }
+
+        a -= 1;
+
+        if (a < 0)
+            a += q->capacity;
+    }
+
+    if (pk)
+        return 1;
+
+    return 0;
+}
+
+
+int init_video_decoder(CodecState *cs)
+{
+    if (vpx_codec_dec_init_ver(&cs->v_decoder, VIDEO_CODEC_DECODER_INTERFACE, NULL, 0, VPX_DECODER_ABI_VERSION) != VPX_CODEC_OK) {
+        fprintf(stderr, "Init video_decoder failed!\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+int init_audio_decoder(CodecState *cs, uint32_t audio_channels)
+{
+    int rc;
+    cs->audio_decoder = opus_decoder_create(cs->audio_sample_rate, audio_channels, &rc );    
+    
+    if ( rc != OPUS_OK ){
+        fprintf(stderr, "Error while starting audio decoder!\n");
+        return -1;
+    }    
+    
+    return 0;
+}
+
+
+int init_video_encoder(CodecState *cs, uint16_t width, uint16_t height, uint32_t video_bitrate)
+{
+    vpx_codec_enc_cfg_t  cfg;
+    int res = vpx_codec_enc_config_default(VIDEO_CODEC_ENCODER_INTERFACE, &cfg, 0);
+    if(res) {
+        printf("Failed to get config: %s\n", vpx_codec_err_to_string(res));
+        return -1;
+    }
+    
+    cfg.rc_target_bitrate = video_bitrate;
+    cfg.g_w = width;
+    cfg.g_h = height;
+    if(vpx_codec_enc_init_ver(&cs->v_encoder, VIDEO_CODEC_ENCODER_INTERFACE, &cfg, 0, VPX_ENCODER_ABI_VERSION) != VPX_CODEC_OK) {
+        fprintf(stderr, "Failed to initialize encoder\n");
+        return -1;
+    }
+    return 0;
+}
+
+int init_audio_encoder(CodecState *cs, uint32_t audio_channels)
+{
+    int err = OPUS_OK;
+    cs->audio_encoder = opus_encoder_create(cs->audio_sample_rate, audio_channels, OPUS_APPLICATION_AUDIO, &err);
+    err = opus_encoder_ctl(cs->audio_encoder, OPUS_SET_BITRATE(cs->audio_bitrate));
+    err = opus_encoder_ctl(cs->audio_encoder, OPUS_SET_COMPLEXITY(10));
+    
+    
+    return err == OPUS_OK ? 0 : -1;
+}
+
+
+CodecState* codec_init_session ( uint32_t audio_bitrate, 
+                                 uint16_t audio_frame_duration, 
+                                 uint32_t audio_sample_rate, 
+                                 uint32_t audio_channels, 
+                                 uint16_t video_width,
+                                 uint16_t video_height,
+                                 uint32_t video_bitrate )
+{
+    CodecState* _retu = calloc(sizeof(CodecState), 1);
+    assert(_retu);
+
+    _retu->audio_bitrate = audio_bitrate;
+    _retu->audio_sample_rate = audio_sample_rate;
+    
+    /* Encoders */
+    if (!video_width || !video_height) {
+        video_width = 320;
+        video_height = 240;
+    }
+        
+    if ( 0 == init_video_encoder(_retu, video_width, video_height, video_bitrate) ) 
+        printf("Video encoder initialized!\n");
+    
+    if ( 0 == init_audio_encoder(_retu, audio_channels) ) 
+        printf("Audio encoder initialized!\n");
+    
+    
+    /* Decoders */
+    if ( 0 == init_video_decoder(_retu) )
+        printf("Video decoder initialized!\n");
+    
+    if ( 0 == init_audio_decoder(_retu, audio_channels) )
+        printf("Audio decoder initialized!\n");
+    
+        
+    return _retu;
+}
+
+void codec_terminate_session ( CodecState* cs ) 
+{
+    if ( cs->audio_encoder ) {
+        opus_encoder_destroy(cs->audio_encoder);
+        printf("Terminated encoder!\n");
+    }
+    
+    if ( cs->audio_decoder ) {
+        opus_decoder_destroy(cs->audio_decoder);
+        printf("Terminated decoder!\n");
+    }
+
+    /* TODO: Terminate video */
+    vpx_codec_destroy(&cs->v_decoder);
+    vpx_codec_destroy(&cs->v_encoder);
+}