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1/** codec.h
2 *
3 * Audio and video codec intitialization, encoding/decoding and playback
4 *
5 * Copyright (C) 2013 Tox project All Rights Reserved.
6 *
7 * This file is part of Tox.
8 *
9 * Tox is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
13 *
14 * Tox is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with Tox. If not, see <http://www.gnu.org/licenses/>.
21 *
22 */
23
24#ifndef _CODEC_H_
25#define _CODEC_H_
26
27#include "toxav.h"
28#include "rtp.h"
29
30#include <stdio.h>
31#include <math.h>
32#include <pthread.h>
33
34#include <vpx/vpx_decoder.h>
35#include <vpx/vpx_encoder.h>
36#include <vpx/vp8dx.h>
37#include <vpx/vp8cx.h>
38#include <vpx/vpx_image.h>
39#define VIDEO_CODEC_DECODER_INTERFACE (vpx_codec_vp8_dx())
40#define VIDEO_CODEC_ENCODER_INTERFACE (vpx_codec_vp8_cx())
41
42/* Audio encoding/decoding */
43#include <opus.h>
44
45#define PAIR(TYPE1__, TYPE2__) struct { TYPE1__ first; TYPE2__ second; }
46
47typedef void (*CSAudioCallback) (void *agent, int32_t call_idx, const int16_t *PCM, uint16_t size, void *data);
48typedef void (*CSVideoCallback) (void *agent, int32_t call_idx, const vpx_image_t *img, void *data);
49
50/**
51 * Codec capabilities
52 */
53typedef enum {
54 cs_AudioEncoding = 1 << 0,
55 cs_AudioDecoding = 1 << 1,
56 cs_VideoEncoding = 1 << 2,
57 cs_VideoDecoding = 1 << 3
58} CSCapabilities;
59
60/**
61 * Codec errors.
62 */
63typedef enum {
64 cs_ErrorSettingVideoResolution = -30,
65 cs_ErrorSettingVideoBitrate = -31,
66 cs_ErrorSplittingVideoPayload = -32,
67} CSError;
68
69/**
70 * Codec session - controling codec
71 */
72typedef struct _CSSession {
73
74 /* VIDEO
75 *
76 *
77 */
78 int support_video;
79
80 /* video encoding */
81 vpx_codec_ctx_t v_encoder;
82 uint32_t frame_counter;
83
84 /* video decoding */
85 vpx_codec_ctx_t v_decoder;
86 int max_width;
87 int max_height;
88 unsigned int video_bitrate;
89
90
91 /* Data handling */
92 uint8_t *frame_buf; /* buffer for split video payloads */
93 uint32_t frame_size; /* largest address written to in frame_buf for current input frame*/
94 uint8_t frameid_in, frameid_out; /* id of input and output video frame */
95 uint32_t last_timestamp; /* calculating cycles */
96
97 /* Limits */
98 uint32_t video_frame_piece_size;
99 uint32_t max_video_frame_size;
100
101 /* Reassembling */
102 uint8_t *split_video_frame;
103 const uint8_t *processing_video_frame;
104 uint16_t processing_video_frame_size;
105
106
107
108 /* AUDIO
109 *
110 *
111 */
112
113 /* audio encoding */
114 OpusEncoder *audio_encoder;
115 int audio_encoder_bitrate;
116 int audio_encoder_sample_rate;
117 int audio_encoder_frame_duration;
118 int audio_encoder_channels;
119
120 /* audio decoding */
121 OpusDecoder *audio_decoder;
122 int audio_decoder_bitrate;
123 int audio_decoder_sample_rate;
124 int audio_decoder_frame_duration;
125 int audio_decoder_channels;
126
127 struct _JitterBuffer *j_buf;
128
129
130 /* Voice activity detection */
131 uint32_t EVAD_tolerance; /* In frames */
132 uint32_t EVAD_tolerance_cr;
133
134
135
136 /* OTHER
137 *
138 *
139 */
140
141 uint64_t capabilities; /* supports*/
142
143 /* Callbacks */
144 PAIR(CSAudioCallback, void *) acb;
145 PAIR(CSVideoCallback, void *) vcb;
146
147 /* Buffering */
148 void *vbuf_raw; /* Un-decoded data */
149 pthread_mutex_t queue_mutex[1];
150
151 void *agent; /* Pointer to ToxAv */
152 int32_t call_idx;
153} CSSession;
154
155/* Make sure to be called BEFORE corresponding rtp_new */
156CSSession *cs_new(const ToxAvCSettings *cs_self, const ToxAvCSettings *cs_peer, uint32_t jbuf_size, int has_video);
157/* Make sure to be called AFTER corresponding rtp_kill */
158void cs_kill(CSSession *cs);
159
160int cs_split_video_payload(CSSession *cs, const uint8_t *payload, uint16_t length);
161const uint8_t *cs_get_split_video_frame(CSSession *cs, uint16_t *size);
162
163/**
164 * Call playback callbacks
165 */
166void cs_do(CSSession *cs);
167
168
169/* Reconfigure video encoder; return 0 on success or -1 on failure. */
170int cs_set_video_encoder_resolution(CSSession *cs, uint16_t width, uint16_t height);
171int cs_set_video_encoder_bitrate(CSSession *cs, uint32_t video_bitrate);
172
173
174/* Internal. Called from rtp_handle_message */
175void queue_message(RTPSession *session, RTPMessage *msg);
176#endif /* _CODEC_H_ */
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