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toxcore/toxav/codec.c

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/** codec.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 "../toxcore/logger.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include "rtp.h"
#include "codec.h"
const uint16_t min_jbuf_size = 4;
const uint16_t min_readiness_idx = 2; /* when is buffer ready to dqq */
int empty_queue(JitterBuffer *q)
{
while (q->size > 0) {
rtp_free_msg(NULL, q->queue[q->front]);
q->front++;
if (q->front == q->capacity)
q->front = 0;
q->size--;
}
q->id_set = 0;
q->queue_ready = 0;
return 0;
}
JitterBuffer *create_queue(int capacity)
{
JitterBuffer *q;
if ( !(q = calloc(sizeof(JitterBuffer), 1)) ) return NULL;
if (!(q->queue = calloc(sizeof(RTPMessage *), capacity))) {
free(q);
return NULL;
}
q->size = 0;
q->capacity = capacity >= min_jbuf_size ? capacity : min_jbuf_size;
q->front = 0;
q->rear = -1;
q->queue_ready = 0;
q->current_id = 0;
q->current_ts = 0;
q->id_set = 0;
return q;
}
void terminate_queue(JitterBuffer *q)
{
empty_queue(q);
free(q->queue);
free(q);
}
#define sequnum_older(sn_a, sn_b, ts_a, ts_b) (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(JitterBuffer *q, int *success)
{
if (q->size == 0 || q->queue_ready == 0) { /* Empty queue */
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 (sequnum_older(next_id, q->current_id, next_ts, q->current_ts)) {
LOGGER_DEBUG("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 {
LOGGER_DEBUG("Packet too old");
*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];
}
void queue(JitterBuffer *q, RTPMessage *pk)
{
if (q->size == q->capacity) { /* Full, empty queue */
LOGGER_DEBUG("Queue full s(%d) c(%d), emptying...", q->size, q->capacity);
empty_queue(q);
}
if (q->size >= min_readiness_idx) q->queue_ready = 1;
++q->size;
++q->rear;
if (q->rear == q->capacity) q->rear = 0;
q->queue[q->rear] = pk;
int a;
int j;
a = q->rear;
for (j = 0; j < q->size - 1; ++j) {
int b = a - 1;
if (b < 0)
b += q->capacity;
if (sequnum_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;
LOGGER_DEBUG("Had to swap");
} else {
break;
}
a -= 1;
if (a < 0) a += q->capacity;
}
}
int init_video_decoder(CodecState *cs)
{
int rc = vpx_codec_dec_init_ver(&cs->v_decoder, VIDEO_CODEC_DECODER_INTERFACE, NULL, 0, VPX_DECODER_ABI_VERSION);
if ( rc != VPX_CODEC_OK) {
LOGGER_ERROR("Init video_decoder failed: %s", vpx_codec_err_to_string(rc));
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 ) {
LOGGER_ERROR("Error while starting audio decoder: %s", opus_strerror(rc));
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 rc = vpx_codec_enc_config_default(VIDEO_CODEC_ENCODER_INTERFACE, &cfg, 0);
if (rc != VPX_CODEC_OK) {
LOGGER_ERROR("Failed to get config: %s", vpx_codec_err_to_string(rc));
return -1;
}
cfg.rc_target_bitrate = video_bitrate;
cfg.g_w = width;
cfg.g_h = height;
cfg.g_pass = VPX_RC_ONE_PASS;
cfg.g_error_resilient = VPX_ERROR_RESILIENT_DEFAULT | VPX_ERROR_RESILIENT_PARTITIONS;
cfg.g_lag_in_frames = 0;
cfg.kf_min_dist = 0;
cfg.kf_max_dist = 300;
rc = vpx_codec_enc_init_ver(&cs->v_encoder, VIDEO_CODEC_ENCODER_INTERFACE, &cfg, 0, VPX_ENCODER_ABI_VERSION);
if ( rc != VPX_CODEC_OK) {
LOGGER_ERROR("Failed to initialize encoder: %s", vpx_codec_err_to_string(rc));
return -1;
}
rc = vpx_codec_control(&cs->v_encoder, VP8E_SET_CPUUSED, 7);
if ( rc != VPX_CODEC_OK) {
LOGGER_ERROR("Failed to set encoder control setting: %s", vpx_codec_err_to_string(rc));
return -1;
}
return 0;
}
int init_audio_encoder(CodecState *cs, uint32_t audio_channels)
{
int rc = OPUS_OK;
cs->audio_encoder = opus_encoder_create(cs->audio_sample_rate, audio_channels, OPUS_APPLICATION_AUDIO, &rc);
if ( rc != OPUS_OK ) {
LOGGER_ERROR("Error while starting audio encoder: %s", opus_strerror(rc));
return -1;
}
rc = opus_encoder_ctl(cs->audio_encoder, OPUS_SET_BITRATE(cs->audio_bitrate));
if ( rc != OPUS_OK ) {
LOGGER_ERROR("Error while setting encoder ctl: %s", opus_strerror(rc));
return -1;
}
rc = opus_encoder_ctl(cs->audio_encoder, OPUS_SET_COMPLEXITY(10));
if ( rc != OPUS_OK ) {
LOGGER_ERROR("Error while setting encoder ctl: %s", opus_strerror(rc));
return -1;
}
return 0;
}
CodecState *codec_init_session ( uint32_t audio_bitrate,
uint16_t audio_frame_duration,
uint32_t audio_sample_rate,
uint32_t audio_channels,
uint32_t audio_VAD_tolerance_ms,
uint16_t video_width,
uint16_t video_height,
uint32_t video_bitrate )
{
CodecState *retu = calloc(sizeof(CodecState), 1);
if (!retu) return NULL;
retu->audio_bitrate = audio_bitrate;
retu->audio_sample_rate = audio_sample_rate;
/* Encoders */
if (!video_width || !video_height) { /* Disable video */
/*video_width = 320;
video_height = 240; */
} else {
retu->capabilities |= ( 0 == init_video_encoder(retu, video_width, video_height, video_bitrate) ) ? v_encoding : 0;
retu->capabilities |= ( 0 == init_video_decoder(retu) ) ? v_decoding : 0;
}
retu->capabilities |= ( 0 == init_audio_encoder(retu, audio_channels) ) ? a_encoding : 0;
retu->capabilities |= ( 0 == init_audio_decoder(retu, audio_channels) ) ? a_decoding : 0;
if ( retu->capabilities == 0 ) { /* everything failed */
free (retu);
return NULL;
}
retu->EVAD_tolerance = audio_VAD_tolerance_ms > audio_frame_duration ?
audio_VAD_tolerance_ms / audio_frame_duration : audio_frame_duration;
return retu;
}
void codec_terminate_session ( CodecState *cs )
{
if ( cs->audio_encoder )
opus_encoder_destroy(cs->audio_encoder);
if ( cs->audio_decoder )
opus_decoder_destroy(cs->audio_decoder);
if ( cs->capabilities & v_decoding )
vpx_codec_destroy(&cs->v_decoder);
if ( cs->capabilities & v_encoding )
vpx_codec_destroy(&cs->v_encoder);
}
inline float calculate_sum_sq (int16_t *n, uint16_t k)
{
float result = 0;
uint16_t i = 0;
for ( ; i < k; i ++) result += (float) (n[i] * n[i]);
return result;
}
int energy_VAD(CodecState *cs, int16_t *PCM, uint16_t frame_size, float energy)
{
float frame_energy = sqrt(calculate_sum_sq(PCM, frame_size)) / frame_size;
if ( frame_energy > energy) {
cs->EVAD_tolerance_cr = cs->EVAD_tolerance; /* Reset counter */
return 1;
}
if ( cs->EVAD_tolerance_cr ) {
cs->EVAD_tolerance_cr --;
return 1;
}
return 0;
}
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