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1/* AV_codec.h
2 *
3 * Audio and video codec intitialisation, 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/*----------------------------------------------------------------------------------*/
25#ifndef _AVCODEC_H_
26#define _AVCODEC_H_
27
28#include <stdio.h>
29#include <math.h>
30#include <libavcodec/avcodec.h>
31#include <libavformat/avformat.h>
32#include <libswscale/swscale.h>
33#include <libavdevice/avdevice.h>
34#include <libavutil/opt.h>
35#include <pthread.h>
36#include <AL/al.h>
37#include <AL/alc.h>
38#include "toxrtp.h"
39#include "tox.h"
40
41#include <SDL/SDL.h>
42#include <opus/opus.h>
43
44/* ffmpeg VP8 codec ID */
45#define VIDEO_CODEC AV_CODEC_ID_VP8
46
47/* ffmpeg Opus codec ID */
48#define AUDIO_CODEC AV_CODEC_ID_OPUS
49
50/* default video bitrate in bytes/s */
51#define VIDEO_BITRATE 10*1000
52
53/* default audio bitrate in bytes/s */
54#define AUDIO_BITRATE 64000
55
56/* audio frame duration in miliseconds */
57#define AUDIO_FRAME_DURATION 20
58
59/* audio sample rate recommended to be 48kHz for Opus */
60#define AUDIO_SAMPLE_RATE 48000
61
62/* the amount of samples in one audio frame */
63#define AUDIO_FRAME_SIZE AUDIO_SAMPLE_RATE*AUDIO_FRAME_DURATION/1000
64
65/* the quit event for SDL */
66#define FF_QUIT_EVENT (SDL_USEREVENT + 2)
67
68#ifdef __linux__
69#define VIDEO_DRIVER "video4linux2"
70#define DEFAULT_WEBCAM "/dev/video0"
71#endif
72
73#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
74#define VIDEO_DRIVER "vfwcap"
75#define DEFAULT_WEBCAM "0"
76#endif
77
78extern SDL_Surface *screen;
79
80typedef struct {
81 SDL_Overlay *bmp;
82 int width, height;
83} VideoPicture;
84
85
86typedef struct {
87 uint8_t send_audio;
88 uint8_t receive_audio;
89 uint8_t send_video;
90 uint8_t receive_video;
91
92 uint8_t support_send_audio;
93 uint8_t support_send_video;
94 uint8_t support_receive_audio;
95 uint8_t support_receive_video;
96
97 /* video encoding */
98 AVInputFormat *video_input_format;
99 AVFormatContext *video_format_ctx;
100 uint8_t video_stream;
101 AVCodecContext *webcam_decoder_ctx;
102 AVCodec *webcam_decoder;
103 AVCodecContext *video_encoder_ctx;
104 AVCodec *video_encoder;
105
106 /* video decoding */
107 AVCodecContext *video_decoder_ctx;
108 AVCodec *video_decoder;
109
110 /* audio encoding */
111 ALCdevice *audio_capture_device;
112 OpusEncoder *audio_encoder;
113 int audio_bitrate;
114
115 /* audio decoding */
116 OpusDecoder *audio_decoder;
117
118 uint8_t req_video_refresh;
119
120 /* context for converting image format to something SDL can use*/
121 struct SwsContext *sws_SDL_r_ctx;
122
123 /* context for converting webcam image format to something the video encoder can use */
124 struct SwsContext *sws_ctx;
125
126 /* rendered video picture, ready for display */
127 VideoPicture video_picture;
128
129 rtp_session_t *_rtp_video;
130 rtp_session_t *_rtp_audio;
131 int socket;
132 Networking_Core *_networking;
133
134 pthread_t encode_audio_thread;
135 pthread_t encode_video_thread;
136
137 pthread_t decode_audio_thread;
138 pthread_t decode_video_thread;
139
140 pthread_mutex_t rtp_msg_mutex_lock;
141 pthread_mutex_t avcodec_mutex_lock;
142
143 uint8_t quit;
144 SDL_Event SDL_event;
145
146 msi_session_t *_msi;
147 uint32_t _frame_rate;
148 uint16_t _send_port, _recv_port;
149 int _tox_sock;
150 //pthread_id _medialoop_id;
151
152} codec_state;
153
154int display_received_frame(codec_state *cs, AVFrame *r_video_frame);
155int init_receive_audio(codec_state *cs);
156int init_decoder(codec_state *cs);
157int init_send_video(codec_state *cs);
158int init_send_audio(codec_state *cs);
159int init_encoder(codec_state *cs);
160int video_encoder_refresh(codec_state *cs, int bps);
161void *encode_video_thread(void *arg);
162void *encode_audio_thread(void *arg);
163int video_decoder_refresh(codec_state *cs, int width, int height);
164int handle_rtp_video_packet(codec_state *cs, rtp_msg_t *r_msg);
165void *decode_video_thread(void *arg);
166void *decode_audio_thread(void *arg);
167
168#endif
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