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/* AV_codec.c
// *
* Audio and video codec intitialisation, 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 <math.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavdevice/avdevice.h>
#include <libavutil/opt.h>
#include <opus/opus.h>
#include <assert.h>
#include "toxmsi.h"
#include "toxrtp.h"
#include "toxmedia.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),1);
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)
{
/* should be stable enough */
/* 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--;
/* FIXME: */
/* rtp_free_msg(cs->_rtp_video, 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_receive_audio(codec_state *cs)
{
int rc;
cs->audio_decoder = opus_decoder_create(48000, 1, &rc );
if ( rc != OPUS_OK ){
printf("Error while starting audio decoder!\n");
return 0;
}
rc = opus_decoder_init(cs->audio_decoder, 48000, 1);
if ( rc != OPUS_OK ){
printf("Error while starting audio decoder!\n");
return 0;
}
printf("Init audio decoder successful\n");
return 1;
}
int init_receive_video(codec_state *cs)
{
cs->video_decoder = avcodec_find_decoder(VIDEO_CODEC);
if (!cs->video_decoder) {
printf("Init video_decoder failed\n");
return 0;
}
cs->video_decoder_ctx = avcodec_alloc_context3(cs->video_decoder);
if (!cs->video_decoder_ctx) {
printf("Init video_decoder_ctx failed\n");
return 0;
}
if (avcodec_open2(cs->video_decoder_ctx, cs->video_decoder, NULL) < 0) {
printf("Opening video decoder failed\n");
return 0;
}
printf("Init video decoder successful\n");
return 1;
}
int init_send_video(codec_state *cs)
{
cs->video_input_format = av_find_input_format(VIDEO_DRIVER);
if (avformat_open_input(&cs->video_format_ctx, DEFAULT_WEBCAM, cs->video_input_format, NULL) != 0) {
printf("opening video_input_format failed\n");
return 0;
}
avformat_find_stream_info(cs->video_format_ctx, NULL);
av_dump_format(cs->video_format_ctx, 0, DEFAULT_WEBCAM, 0);
int i;
for (i = 0; i < cs->video_format_ctx->nb_streams; ++i) {
if (cs->video_format_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
cs->video_stream = i;
break;
}
}
cs->webcam_decoder_ctx = cs->video_format_ctx->streams[cs->video_stream]->codec;
cs->webcam_decoder = avcodec_find_decoder(cs->webcam_decoder_ctx->codec_id);
if (cs->webcam_decoder == NULL) {
printf("Unsupported codec\n");
return 0;
}
if (cs->webcam_decoder_ctx == NULL) {
printf("init webcam_decoder_ctx failed\n");
return 0;
}
if (avcodec_open2(cs->webcam_decoder_ctx, cs->webcam_decoder, NULL) < 0) {
printf("opening webcam decoder failed\n");
return 0;
}
cs->video_encoder = avcodec_find_encoder(VIDEO_CODEC);
if (!cs->video_encoder) {
printf("init video_encoder failed\n");
return 0;
}
cs->video_encoder_ctx = avcodec_alloc_context3(cs->video_encoder);
if (!cs->video_encoder_ctx) {
printf("init video_encoder_ctx failed\n");
return 0;
}
cs->video_encoder_ctx->bit_rate = VIDEO_BITRATE;
cs->video_encoder_ctx->rc_min_rate = cs->video_encoder_ctx->rc_max_rate = cs->video_encoder_ctx->bit_rate;
av_opt_set_double(cs->video_encoder_ctx->priv_data, "max-intra-rate", 90, 0);
av_opt_set(cs->video_encoder_ctx->priv_data, "quality", "realtime", 0);
cs->video_encoder_ctx->thread_count = 4;
cs->video_encoder_ctx->rc_buffer_aggressivity = 0.95;
cs->video_encoder_ctx->rc_buffer_size = VIDEO_BITRATE * 6;
cs->video_encoder_ctx->profile = 3;
cs->video_encoder_ctx->qmax = 54;
cs->video_encoder_ctx->qmin = 4;
AVRational myrational = {1, 25};
cs->video_encoder_ctx->time_base = myrational;
cs->video_encoder_ctx->gop_size = 99999;
cs->video_encoder_ctx->pix_fmt = PIX_FMT_YUV420P;
cs->video_encoder_ctx->width = cs->webcam_decoder_ctx->width;
cs->video_encoder_ctx->height = cs->webcam_decoder_ctx->height;
if (avcodec_open2(cs->video_encoder_ctx, cs->video_encoder, NULL) < 0) {
printf("opening video encoder failed\n");
return 0;
}
printf("init video encoder successful\n");
return 1;
}
int init_send_audio(codec_state *cs)
{
cs->support_send_audio = 0;
int err = OPUS_OK;
cs->audio_bitrate = AUDIO_BITRATE;
cs->audio_encoder = opus_encoder_create(AUDIO_SAMPLE_RATE, 1, OPUS_APPLICATION_VOIP, &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));
err = opus_encoder_ctl(cs->audio_encoder, OPUS_SET_SIGNAL(OPUS_SIGNAL_VOICE));
opus_encoder_init(cs->audio_encoder, AUDIO_SAMPLE_RATE, 1, OPUS_APPLICATION_VOIP);
int nfo;
err = opus_encoder_ctl(cs->audio_encoder, OPUS_GET_LOOKAHEAD(&nfo));
/* printf("Encoder lookahead delay : %d\n", nfo); */
printf("init audio encoder successful\n");
return 1;
}
int init_encoder(codec_state *cs)
{
avdevice_register_all();
avcodec_register_all();
avdevice_register_all();
av_register_all();
pthread_mutex_init(&cs->rtp_msg_mutex_lock, NULL);
pthread_mutex_init(&cs->avcodec_mutex_lock, NULL);
cs->support_send_video = init_send_video(cs);
cs->support_send_audio = init_send_audio(cs);
cs->send_audio = 1;
cs->send_video = 1;
return 1;
}
int init_decoder(codec_state *cs)
{
avdevice_register_all();
avcodec_register_all();
avdevice_register_all();
av_register_all();
cs->receive_video = 0;
cs->receive_audio = 0;
cs->support_receive_video = init_receive_video(cs);
cs->support_receive_audio = init_receive_audio(cs);
cs->receive_audio = 1;
cs->receive_video = 1;
return 1;
}
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