toxcore/toxav/groupav.c

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/** groupav.h
*
* Copyright (C) 2014 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 "groupav.h"
#include "../toxcore/logger.h"
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#include "../toxcore/util.h"
#define GROUP_JBUF_SIZE 6
#define GROUP_JBUF_DEAD_SECONDS 4
typedef struct {
uint16_t sequnum;
uint16_t length;
uint8_t data[];
} Group_Audio_Packet;
typedef struct {
Group_Audio_Packet **queue;
uint32_t size;
uint32_t capacity;
uint16_t bottom;
uint16_t top;
uint64_t last_queued_time;
} Group_JitterBuffer;
static Group_JitterBuffer *create_queue(unsigned int capacity)
{
unsigned int size = 1;
while (size <= capacity) {
size *= 2;
}
Group_JitterBuffer *q;
if (!(q = (Group_JitterBuffer *)calloc(sizeof(Group_JitterBuffer), 1))) {
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return NULL;
}
if (!(q->queue = (Group_Audio_Packet **)calloc(sizeof(Group_Audio_Packet *), size))) {
free(q);
return NULL;
}
q->size = size;
q->capacity = capacity;
return q;
}
static void clear_queue(Group_JitterBuffer *q)
{
for (; q->bottom != q->top; ++q->bottom) {
if (q->queue[q->bottom % q->size]) {
free(q->queue[q->bottom % q->size]);
q->queue[q->bottom % q->size] = NULL;
}
}
}
static void terminate_queue(Group_JitterBuffer *q)
{
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if (!q) {
return;
}
clear_queue(q);
free(q->queue);
free(q);
}
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/* Return 0 if packet was queued, -1 if it wasn't.
*/
static int queue(Group_JitterBuffer *q, Group_Audio_Packet *pk)
{
uint16_t sequnum = pk->sequnum;
unsigned int num = sequnum % q->size;
if (!is_timeout(q->last_queued_time, GROUP_JBUF_DEAD_SECONDS)) {
if ((uint32_t)(sequnum - q->bottom) > (1 << 15)) {
/* Drop old packet. */
return -1;
}
}
if ((uint32_t)(sequnum - q->bottom) > q->size) {
clear_queue(q);
q->bottom = sequnum - q->capacity;
q->queue[num] = pk;
q->top = sequnum + 1;
q->last_queued_time = unix_time();
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return 0;
}
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if (q->queue[num]) {
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return -1;
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}
q->queue[num] = pk;
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if ((sequnum - q->bottom) >= (q->top - q->bottom)) {
q->top = sequnum + 1;
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}
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q->last_queued_time = unix_time();
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return 0;
}
/* success is 0 when there is nothing to dequeue, 1 when there's a good packet, 2 when there's a lost packet */
static Group_Audio_Packet *dequeue(Group_JitterBuffer *q, int *success)
{
if (q->top == q->bottom) {
*success = 0;
return NULL;
}
unsigned int num = q->bottom % q->size;
if (q->queue[num]) {
Group_Audio_Packet *ret = q->queue[num];
q->queue[num] = NULL;
++q->bottom;
*success = 1;
return ret;
}
if ((uint32_t)(q->top - q->bottom) > q->capacity) {
++q->bottom;
*success = 2;
return NULL;
}
*success = 0;
return NULL;
}
typedef struct {
Logger *log;
Group_Chats *g_c;
OpusEncoder *audio_encoder;
unsigned int audio_channels, audio_sample_rate, audio_bitrate;
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uint16_t audio_sequnum;
void (*audio_data)(Messenger *m, int groupnumber, int peernumber, const int16_t *pcm, unsigned int samples,
uint8_t channels, unsigned int sample_rate, void *userdata);
void *userdata;
} Group_AV;
typedef struct {
Group_JitterBuffer *buffer;
OpusDecoder *audio_decoder;
int decoder_channels;
unsigned int last_packet_samples;
} Group_Peer_AV;
static void kill_group_av(Group_AV *group_av)
{
if (group_av->audio_encoder) {
opus_encoder_destroy(group_av->audio_encoder);
}
free(group_av);
}
static int recreate_encoder(Group_AV *group_av)
{
if (group_av->audio_encoder) {
opus_encoder_destroy(group_av->audio_encoder);
group_av->audio_encoder = NULL;
}
int rc = OPUS_OK;
group_av->audio_encoder = opus_encoder_create(group_av->audio_sample_rate, group_av->audio_channels,
OPUS_APPLICATION_AUDIO, &rc);
if (rc != OPUS_OK) {
LOGGER_ERROR(group_av->log, "Error while starting audio encoder: %s", opus_strerror(rc));
group_av->audio_encoder = NULL;
return -1;
}
rc = opus_encoder_ctl(group_av->audio_encoder, OPUS_SET_BITRATE(group_av->audio_bitrate));
if (rc != OPUS_OK) {
LOGGER_ERROR(group_av->log, "Error while setting encoder ctl: %s", opus_strerror(rc));
opus_encoder_destroy(group_av->audio_encoder);
group_av->audio_encoder = NULL;
return -1;
}
rc = opus_encoder_ctl(group_av->audio_encoder, OPUS_SET_COMPLEXITY(10));
if (rc != OPUS_OK) {
LOGGER_ERROR(group_av->log, "Error while setting encoder ctl: %s", opus_strerror(rc));
opus_encoder_destroy(group_av->audio_encoder);
group_av->audio_encoder = NULL;
return -1;
}
return 0;
}
static Group_AV *new_group_av(Logger *log, Group_Chats *g_c, void (*audio_callback)(Messenger *, int, int,
const int16_t *,
unsigned int, uint8_t, unsigned int, void *), void *userdata)
{
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if (!g_c) {
return NULL;
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}
Group_AV *group_av = (Group_AV *)calloc(1, sizeof(Group_AV));
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if (!group_av) {
return NULL;
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}
group_av->log = log;
group_av->g_c = g_c;
group_av->audio_data = audio_callback;
group_av->userdata = userdata;
return group_av;
}
static void group_av_peer_new(void *object, int groupnumber, int friendgroupnumber)
{
Group_AV *group_av = (Group_AV *)object;
Group_Peer_AV *peer_av = (Group_Peer_AV *)calloc(1, sizeof(Group_Peer_AV));
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if (!peer_av) {
return;
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}
peer_av->buffer = create_queue(GROUP_JBUF_SIZE);
group_peer_set_object(group_av->g_c, groupnumber, friendgroupnumber, peer_av);
}
static void group_av_peer_delete(void *object, int groupnumber, int friendgroupnumber, void *peer_object)
{
Group_Peer_AV *peer_av = (Group_Peer_AV *)peer_object;
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if (!peer_av) {
return;
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}
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if (peer_av->audio_decoder) {
opus_decoder_destroy(peer_av->audio_decoder);
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}
terminate_queue(peer_av->buffer);
free(peer_object);
}
static void group_av_groupchat_delete(void *object, int groupnumber)
{
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if (object) {
kill_group_av((Group_AV *)object);
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}
}
static int decode_audio_packet(Group_AV *group_av, Group_Peer_AV *peer_av, int groupnumber, int friendgroupnumber)
{
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if (!group_av || !peer_av) {
return -1;
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}
int success;
Group_Audio_Packet *pk = dequeue(peer_av->buffer, &success);
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if (success == 0) {
return -1;
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}
int16_t *out_audio = NULL;
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int out_audio_samples = 0;
unsigned int sample_rate = 48000;
if (success == 1) {
int channels = opus_packet_get_nb_channels(pk->data);
if (channels == OPUS_INVALID_PACKET) {
free(pk);
return -1;
}
if (channels != 1 && channels != 2) {
free(pk);
return -1;
}
if (channels != peer_av->decoder_channels) {
if (peer_av->audio_decoder) {
opus_decoder_destroy(peer_av->audio_decoder);
peer_av->audio_decoder = NULL;
}
int rc;
peer_av->audio_decoder = opus_decoder_create(sample_rate, channels, &rc);
if (rc != OPUS_OK) {
LOGGER_ERROR(group_av->log, "Error while starting audio decoder: %s", opus_strerror(rc));
free(pk);
return -1;
}
peer_av->decoder_channels = channels;
}
int num_samples = opus_decoder_get_nb_samples(peer_av->audio_decoder, pk->data, pk->length);
out_audio = (int16_t *)malloc(num_samples * peer_av->decoder_channels * sizeof(int16_t));
if (!out_audio) {
free(pk);
return -1;
}
out_audio_samples = opus_decode(peer_av->audio_decoder, pk->data, pk->length, out_audio, num_samples, 0);
free(pk);
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if (out_audio_samples <= 0) {
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free(out_audio);
return -1;
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}
peer_av->last_packet_samples = out_audio_samples;
} else {
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if (!peer_av->audio_decoder) {
return -1;
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}
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if (!peer_av->last_packet_samples) {
return -1;
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}
out_audio = (int16_t *)malloc(peer_av->last_packet_samples * peer_av->decoder_channels * sizeof(int16_t));
if (!out_audio) {
free(pk);
return -1;
}
out_audio_samples = opus_decode(peer_av->audio_decoder, NULL, 0, out_audio, peer_av->last_packet_samples, 1);
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if (out_audio_samples <= 0) {
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free(out_audio);
return -1;
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}
}
if (out_audio) {
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if (group_av->audio_data) {
group_av->audio_data(group_av->g_c->m, groupnumber, friendgroupnumber, out_audio, out_audio_samples,
peer_av->decoder_channels, sample_rate, group_av->userdata);
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}
free(out_audio);
return 0;
}
return -1;
}
static int handle_group_audio_packet(void *object, int groupnumber, int friendgroupnumber, void *peer_object,
const uint8_t *packet, uint16_t length)
{
if (!peer_object || !object || length <= sizeof(uint16_t)) {
return -1;
}
Group_Peer_AV *peer_av = (Group_Peer_AV *)peer_object;
Group_Audio_Packet *pk = (Group_Audio_Packet *)calloc(1, sizeof(Group_Audio_Packet) + (length - sizeof(uint16_t)));
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if (!pk) {
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return -1;
}
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uint16_t sequnum;
memcpy(&sequnum, packet, sizeof(sequnum));
pk->sequnum = ntohs(sequnum);
pk->length = length - sizeof(uint16_t);
memcpy(pk->data, packet + sizeof(uint16_t), length - sizeof(uint16_t));
if (queue(peer_av->buffer, pk) == -1) {
free(pk);
return -1;
}
while (decode_audio_packet((Group_AV *)object, peer_av, groupnumber, friendgroupnumber) == 0) {
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;
}
return 0;
}
/* Convert groupchat to an A/V groupchat.
*
* return 0 on success.
* return -1 on failure.
*/
static int groupchat_enable_av(Logger *log, Group_Chats *g_c, int groupnumber, void (*audio_callback)(Messenger *, int,
int,
const int16_t *, unsigned int, uint8_t, unsigned int, void *), void *userdata)
{
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if (groupnumber == -1) {
return -1;
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}
Group_AV *group_av = new_group_av(log, g_c, audio_callback, userdata);
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if (group_av == NULL) {
return -1;
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}
if (group_set_object(g_c, groupnumber, group_av) == -1
|| callback_groupchat_peer_new(g_c, groupnumber, group_av_peer_new) == -1
|| callback_groupchat_peer_delete(g_c, groupnumber, group_av_peer_delete) == -1
|| callback_groupchat_delete(g_c, groupnumber, group_av_groupchat_delete) == -1) {
kill_group_av(group_av);
return -1;
}
group_lossy_packet_registerhandler(g_c, GROUP_AUDIO_PACKET_ID, &handle_group_audio_packet);
return 0;
}
/* Create a new toxav group.
*
* return group number on success.
* return -1 on failure.
*/
int add_av_groupchat(Logger *log, Group_Chats *g_c, void (*audio_callback)(Messenger *, int, int, const int16_t *,
unsigned int,
uint8_t, unsigned int, void *), void *userdata)
{
int groupnumber = add_groupchat(g_c, GROUPCHAT_TYPE_AV);
if (groupnumber == -1) {
return -1;
}
if (groupchat_enable_av(log, g_c, groupnumber, audio_callback, userdata) == -1) {
del_groupchat(g_c, groupnumber);
return -1;
}
return groupnumber;
}
/* Join a AV group (you need to have been invited first.)
*
* returns group number on success
* returns -1 on failure.
*/
int join_av_groupchat(Logger *log, Group_Chats *g_c, int32_t friendnumber, const uint8_t *data, uint16_t length,
void (*audio_callback)(Messenger *, int, int, const int16_t *, unsigned int, uint8_t, unsigned int, void *),
void *userdata)
{
int groupnumber = join_groupchat(g_c, friendnumber, GROUPCHAT_TYPE_AV, data, length);
if (groupnumber == -1) {
return -1;
}
if (groupchat_enable_av(log, g_c, groupnumber, audio_callback, userdata) == -1) {
del_groupchat(g_c, groupnumber);
return -1;
}
return groupnumber;
}
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/* Send an encoded audio packet to the group chat.
*
* return 0 on success.
* return -1 on failure.
*/
static int send_audio_packet(Group_Chats *g_c, int groupnumber, uint8_t *packet, uint16_t length)
{
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if (!length) {
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return -1;
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}
Group_AV *group_av = (Group_AV *)group_get_object(g_c, groupnumber);
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uint8_t data[1 + sizeof(uint16_t) + length];
data[0] = GROUP_AUDIO_PACKET_ID;
uint16_t sequnum = htons(group_av->audio_sequnum);
memcpy(data + 1, &sequnum, sizeof(sequnum));
memcpy(data + 1 + sizeof(sequnum), packet, length);
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if (send_group_lossy_packet(g_c, groupnumber, data, sizeof(data)) == -1) {
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return -1;
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}
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++group_av->audio_sequnum;
return 0;
}
/* Send audio to the group chat.
*
* return 0 on success.
* return -1 on failure.
*/
int group_send_audio(Group_Chats *g_c, int groupnumber, const int16_t *pcm, unsigned int samples, uint8_t channels,
unsigned int sample_rate)
{
Group_AV *group_av = (Group_AV *)group_get_object(g_c, groupnumber);
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if (!group_av) {
return -1;
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}
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if (channels != 1 && channels != 2) {
return -1;
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}
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if (sample_rate != 8000 && sample_rate != 12000 && sample_rate != 16000 && sample_rate != 24000
&& sample_rate != 48000) {
return -1;
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}
if (!group_av->audio_encoder || group_av->audio_channels != channels || group_av->audio_sample_rate != sample_rate) {
group_av->audio_channels = channels;
group_av->audio_sample_rate = sample_rate;
if (channels == 1) {
group_av->audio_bitrate = 32000; // TODO(mannol): add way of adjusting bitrate
} else {
group_av->audio_bitrate = 64000; // TODO(mannol): add way of adjusting bitrate
}
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if (recreate_encoder(group_av) == -1) {
return -1;
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}
}
uint8_t encoded[1024];
int32_t size = opus_encode(group_av->audio_encoder, pcm, samples, encoded, sizeof(encoded));
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if (size <= 0) {
return -1;
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}
return send_audio_packet(g_c, groupnumber, encoded, size);
}