528 lines
16 KiB
C
528 lines
16 KiB
C
/*
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* Copyright (C) 2011 Doubango Telecom <http://www.doubango.org>
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*
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* Contact: Mamadou Diop <diopmamadou(at)doubango(DOT)org>
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*
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* This file is part of Open Source Doubango Framework.
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*
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* DOUBANGO is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DOUBANGO is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with DOUBANGO.
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*
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*/
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/**@file tdav_video_jb.c
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* @brief Video Jitter Buffer
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*
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* @author Mamadou Diop <diopmamadou(at)doubango(DOT)org>
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*/
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#include "tinydav/video/jb/tdav_video_jb.h"
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#include "tinydav/video/jb/tdav_video_frame.h"
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#include "tinyrtp/rtp/trtp_rtp_packet.h"
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#include "tsk_time.h"
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#include "tsk_memory.h"
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#include "tsk_thread.h"
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#include "tsk_condwait.h"
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#include "tsk_debug.h"
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#if TSK_UNDER_WINDOWS
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# include <windows.h>
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#endif
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#define TDAV_VIDEO_JB_DISABLE 0
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// default frame rate
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// the corret fps will be computed using the RTP timestamps
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#define TDAV_VIDEO_JB_FPS TDAV_VIDEO_JB_FPS_MAX
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#define TDAV_VIDEO_JB_FPS_MIN 10
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#define TDAV_VIDEO_JB_FPS_MAX 60
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// Number of correct consecutive video frames to receive before computing the FPS
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#define TDAV_VIDEO_JB_FPS_PROB (TDAV_VIDEO_JB_FPS << 1)
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// Maximum gap allowed (used to detect seqnum wrpping)
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#define TDAV_VIDEO_JB_MAX_DROPOUT 0xFD9B
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#define TDAV_VIDEO_JB_TAIL_MAX_LOG2 1
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#if TDAV_UNDER_MOBILE /* to avoid too high memory usage */
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# define TDAV_VIDEO_JB_TAIL_MAX (TDAV_VIDEO_JB_FPS_MIN << TDAV_VIDEO_JB_TAIL_MAX_LOG2)
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#else
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# define TDAV_VIDEO_JB_TAIL_MAX (TDAV_VIDEO_JB_FPS_MAX << TDAV_VIDEO_JB_TAIL_MAX_LOG2)
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#endif
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#define TDAV_VIDEO_JB_RATE 90 /* KHz */
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#define TDAV_VIDEO_JB_LATENCY_MIN 2 /* Must be > 0 */
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#define TDAV_VIDEO_JB_LATENCY_MAX 15 /* Default, will be updated using fps */
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static const tdav_video_frame_t* _tdav_video_jb_get_frame(struct tdav_video_jb_s* self, uint32_t timestamp, uint8_t pt, tsk_bool_t *pt_matched);
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static void* TSK_STDCALL _tdav_video_jb_decode_thread_func(void *arg);
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typedef struct tdav_video_jb_s
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{
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TSK_DECLARE_OBJECT;
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tsk_bool_t started;
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int32_t fps;
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int32_t fps_prob;
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int32_t avg_duration;
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int32_t rate; // in Khz
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uint32_t last_timestamp;
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int32_t conseq_frame_drop;
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int32_t tail_max;
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tdav_video_frames_L_t *frames;
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int64_t frames_count;
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tsk_size_t latency_min;
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tsk_size_t latency_max;
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uint32_t decode_last_timestamp;
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int32_t decode_last_seq_num_with_mark; // -1 = unset
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uint64_t decode_last_time;
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tsk_thread_handle_t* decode_thread[1];
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tsk_condwait_handle_t* decode_thread_cond;
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uint16_t seq_nums[0xFF];
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tdav_video_jb_cb_f callback;
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const void* callback_data;
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// to avoid locking use different cb_data
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tdav_video_jb_cb_data_xt cb_data_rtp;
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tdav_video_jb_cb_data_xt cb_data_fdd;
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tdav_video_jb_cb_data_xt cb_data_any;
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struct{
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void* ptr;
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tsk_size_t size;
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} buffer;
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TSK_DECLARE_SAFEOBJ;
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}
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tdav_video_jb_t;
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static tsk_object_t* tdav_video_jb_ctor(tsk_object_t * self, va_list * app)
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{
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tdav_video_jb_t *jb = self;
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if(jb){
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if(!(jb->frames = tsk_list_create())){
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TSK_DEBUG_ERROR("Failed to create list");
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return tsk_null;
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}
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if(!(jb->decode_thread_cond = tsk_condwait_create())){
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TSK_DEBUG_ERROR("Failed to create condition var");
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return tsk_null;
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}
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jb->cb_data_fdd.type = tdav_video_jb_cb_data_type_fdd;
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jb->cb_data_rtp.type = tdav_video_jb_cb_data_type_rtp;
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jb->decode_last_seq_num_with_mark = -1;
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jb->fps = TDAV_VIDEO_JB_FPS_MAX;
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jb->rate = TDAV_VIDEO_JB_RATE;
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jb->latency_min = TDAV_VIDEO_JB_LATENCY_MIN;
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jb->latency_max = TDAV_VIDEO_JB_LATENCY_MAX;
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tsk_safeobj_init(jb);
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}
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return self;
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}
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static tsk_object_t* tdav_video_jb_dtor(tsk_object_t * self)
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{
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tdav_video_jb_t *jb = self;
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if(jb){
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if(jb->started){
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tdav_video_jb_stop(jb);
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}
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TSK_OBJECT_SAFE_FREE(jb->frames);
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if(jb->decode_thread_cond){
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tsk_condwait_destroy(&jb->decode_thread_cond);
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}
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TSK_SAFE_FREE(jb->buffer.ptr);
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tsk_safeobj_deinit(jb);
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}
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return self;
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}
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static const tsk_object_def_t tdav_video_jb_def_s =
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{
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sizeof(tdav_video_jb_t),
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tdav_video_jb_ctor,
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tdav_video_jb_dtor,
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tsk_null,
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};
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tdav_video_jb_t* tdav_video_jb_create()
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{
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tdav_video_jb_t* jb;
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if((jb = tsk_object_new(&tdav_video_jb_def_s))){
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jb->fps = TDAV_VIDEO_JB_FPS;
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jb->fps_prob = TDAV_VIDEO_JB_FPS_PROB;
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jb->tail_max = TDAV_VIDEO_JB_TAIL_MAX;
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}
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return jb;
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}
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#define tdav_video_jb_reset_fps_prob(self) {\
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(self)->fps_prob = TDAV_VIDEO_JB_FPS_PROB; \
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(self)->last_timestamp = 0; \
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(self)->avg_duration = 0; \
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}
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#define tdav_video_jb_reset_tail_min_prob(self) {\
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(self)->tail_prob = TDAV_VIDEO_JB_TAIL_MIN_PROB; \
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(self)->tail_min = TDAV_VIDEO_JB_TAIL_MIN_MAX; \
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}
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int tdav_video_jb_set_callback(tdav_video_jb_t* self, tdav_video_jb_cb_f callback, const void* usr_data)
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{
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if(!self){
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TSK_DEBUG_ERROR("Invalid parameter");
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return -1;
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}
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self->callback = callback;
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self->cb_data_any.usr_data = usr_data;
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self->cb_data_fdd.usr_data = usr_data;
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self->cb_data_rtp.usr_data = usr_data;
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return 0;
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}
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int tdav_video_jb_start(tdav_video_jb_t* self)
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{
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int ret = 0;
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if(!self){
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TSK_DEBUG_ERROR("Invalid parameter");
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return -1;
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}
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if(self->started){
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return 0;
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}
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self->started = tsk_true;
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if(!self->decode_thread[0]){
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ret = tsk_thread_create(&self->decode_thread[0], _tdav_video_jb_decode_thread_func, self);
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if(ret != 0 || !self->decode_thread[0]){
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TSK_DEBUG_ERROR("Failed to create new thread");
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}
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ret = tsk_thread_set_priority(self->decode_thread[0], TSK_THREAD_PRIORITY_TIME_CRITICAL);
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}
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return ret;
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}
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int tdav_video_jb_put(tdav_video_jb_t* self, trtp_rtp_packet_t* rtp_pkt)
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{
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#if TDAV_VIDEO_JB_DISABLE
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self->cb_data_rtp.rtp.pkt = rtp_pkt;
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self->callback(&self->cb_data_rtp);
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#else
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const tdav_video_frame_t* old_frame;
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tsk_bool_t pt_matched = tsk_false, is_frame_late_or_dup = tsk_false, is_restarted = tsk_false;
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uint16_t* seq_num;
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if(!self || !rtp_pkt || !rtp_pkt->header){
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TSK_DEBUG_ERROR("Invalid parameter");
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return -1;
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}
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if(!self->started){
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TSK_DEBUG_INFO("Video jitter buffer not started");
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return 0;
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}
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seq_num = &self->seq_nums[rtp_pkt->header->payload_type];
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tsk_safeobj_lock(self);
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//TSK_DEBUG_INFO("receive seqnum=%u", rtp_pkt->header->seq_num);
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if(self->decode_last_timestamp && (self->decode_last_timestamp > rtp_pkt->header->timestamp)){
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if((self->decode_last_timestamp - rtp_pkt->header->timestamp) < TDAV_VIDEO_JB_MAX_DROPOUT){
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TSK_DEBUG_INFO("--------Frame already Decoded [seqnum=%u]------------", rtp_pkt->header->seq_num);
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tsk_safeobj_unlock(self);
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return 0;
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}
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}
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old_frame = _tdav_video_jb_get_frame(self, rtp_pkt->header->timestamp, rtp_pkt->header->payload_type, &pt_matched);
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if((*seq_num && *seq_num != 0xFFFF) && (*seq_num + 1) != rtp_pkt->header->seq_num){
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int32_t diff = ((int32_t)rtp_pkt->header->seq_num - (int32_t)*seq_num);
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tsk_bool_t is_frame_loss = (diff > 0);
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is_restarted = (TSK_ABS(diff) > TDAV_VIDEO_JB_MAX_DROPOUT);
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is_frame_late_or_dup = !is_frame_loss;
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tdav_video_jb_reset_fps_prob(self);
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TSK_DEBUG_INFO("Packet %s (from JB) [%hu - %hu]", is_frame_loss ? "loss" : "late/duplicated/nack", *seq_num, rtp_pkt->header->seq_num);
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if(is_frame_loss && !is_restarted){
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if(self->callback){
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self->cb_data_any.type = tdav_video_jb_cb_data_type_fl;
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self->cb_data_any.ssrc = rtp_pkt->header->ssrc;
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self->cb_data_any.fl.seq_num = (*seq_num + 1);
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self->cb_data_any.fl.count = diff - 1;
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self->callback(&self->cb_data_any);
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}
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}
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}
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if(!old_frame){
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tdav_video_frame_t* new_frame;
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if(pt_matched){
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// if we have a frame with the same payload type but without this timestamp this means that we moved to a new frame
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// this happens if the frame is waiting to be decoded or the marker is lost
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}
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if((new_frame = tdav_video_frame_create(rtp_pkt))){
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// compute avg frame duration
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if(self->last_timestamp && self->last_timestamp < rtp_pkt->header->timestamp){
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uint32_t duration = (rtp_pkt->header->timestamp - self->last_timestamp)/self->rate;
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self->avg_duration = self->avg_duration ? ((self->avg_duration + duration) >> 1) : duration;
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--self->fps_prob;
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}
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self->last_timestamp = rtp_pkt->header->timestamp;
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tsk_list_lock(self->frames);
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if(self->frames_count >= self->tail_max){
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if(++self->conseq_frame_drop >= self->tail_max){
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TSK_DEBUG_ERROR("Too many frames dropped and fps=%d", self->fps);
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tsk_list_clear_items(self->frames);
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self->conseq_frame_drop = 0;
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self->frames_count = 1;
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if(self->callback){
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self->cb_data_any.type = tdav_video_jb_cb_data_type_tmfr;
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self->cb_data_any.ssrc = rtp_pkt->header->ssrc;
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self->callback(&self->cb_data_any);
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}
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}
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else{
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TSK_DEBUG_INFO("Dropping video frame because frames_count(%lld)>=tail_max(%d)", self->frames_count, self->tail_max);
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tsk_list_remove_first_item(self->frames);
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}
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tdav_video_jb_reset_fps_prob(self);
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}
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else{
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++self->frames_count;
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}
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tsk_list_push_ascending_data(self->frames, (void**)&new_frame);
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tsk_list_unlock(self->frames);
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}
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if(self->fps_prob <= 0 && self->avg_duration){
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// compute FPS using timestamp values
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int32_t fps_new = (1000 / self->avg_duration);
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int32_t fps_old = self->fps;
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self->fps = TSK_CLAMP(TDAV_VIDEO_JB_FPS_MIN, fps_new, TDAV_VIDEO_JB_FPS_MAX);
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self->tail_max = (self->fps << TDAV_VIDEO_JB_TAIL_MAX_LOG2); // maximum delay = 2 seconds
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self->latency_max = self->fps; // maximum = 1 second
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TSK_DEBUG_INFO("According to rtp-timestamps ...FPS = %d (clipped to %d) tail_max=%d, latency_max=%u", fps_new, self->fps, self->tail_max, self->latency_max);
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tdav_video_jb_reset_fps_prob(self);
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if(self->callback && (fps_old != self->fps)){
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self->cb_data_any.type = tdav_video_jb_cb_data_type_fps_changed;
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self->cb_data_any.ssrc = rtp_pkt->header->ssrc;
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self->cb_data_any.fps.new = self->fps; // clipped value
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self->cb_data_any.fps.old = fps_old;
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self->callback(&self->cb_data_any);
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}
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}
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}
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else{
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tdav_video_frame_put((tdav_video_frame_t*)old_frame, rtp_pkt);
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}
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tsk_safeobj_unlock(self);
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if(!is_frame_late_or_dup || is_restarted){
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*seq_num = rtp_pkt->header->seq_num;
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}
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#endif
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return 0;
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}
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int tdav_video_jb_stop(tdav_video_jb_t* self)
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{
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int ret;
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if(!self){
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TSK_DEBUG_ERROR("Invalid parameter");
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return -1;
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}
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if(!self->started){
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return 0;
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}
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TSK_DEBUG_INFO("tdav_video_jb_stop()");
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self->started = tsk_false;
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ret = tsk_condwait_broadcast(self->decode_thread_cond);
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if(self->decode_thread[0]){
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ret = tsk_thread_join(&self->decode_thread[0]);
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}
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return ret;
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}
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static const tdav_video_frame_t* _tdav_video_jb_get_frame(tdav_video_jb_t* self, uint32_t timestamp, uint8_t pt, tsk_bool_t *pt_matched)
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{
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const tdav_video_frame_t* ret = tsk_null;
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const tsk_list_item_t *item;
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*pt_matched =tsk_false;
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tsk_list_lock(self->frames);
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tsk_list_foreach(item, self->frames){
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if(TDAV_VIDEO_FRAME(item->data)->payload_type == pt){
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if(!(*pt_matched)) *pt_matched = tsk_true;
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if(TDAV_VIDEO_FRAME(item->data)->timestamp == timestamp){
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ret = item->data;
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break;
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}
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}
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}
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tsk_list_unlock(self->frames);
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return ret;
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}
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static void* TSK_STDCALL _tdav_video_jb_decode_thread_func(void *arg)
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{
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tdav_video_jb_t* jb = (tdav_video_jb_t*)arg;
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uint64_t delay;
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uint16_t missing_seq_num_start = 0, prev_missing_seq_num_start = 0;
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tsk_size_t missing_seq_num_count = 0, prev_lasted_missing_seq_num_count = 0;
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const tdav_video_frame_t* frame;
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tsk_list_item_t* item;
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uint64_t next_decode_duration = (1000 / jb->fps), now;
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uint64_t x_decode_duration = (1000 / jb->fps); // expected
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uint64_t x_decode_time = tsk_time_now();//expected
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tsk_bool_t postpone;
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static const uint64_t __toomuch_delay_to_be_valid = 10000; // guard against systems with buggy "tsk_time_now()" -Won't say Windows ...but :)-
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jb->decode_last_seq_num_with_mark = -1; // -1 -> unset
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jb->decode_last_time = tsk_time_now();
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(now);
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(delay);
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TSK_DEBUG_INFO("Video jitter buffer thread - ENTER");
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while(jb->started){
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tsk_condwait_timedwait(jb->decode_thread_cond, next_decode_duration);
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if(!jb->started){
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break;
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}
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// TSK_DEBUG_INFO("Frames count = %d", jb->frames_count);
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if(jb->frames_count >= jb->latency_min){
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item = tsk_null;
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postpone = tsk_false;
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tsk_safeobj_lock(jb); // against get_frame()
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tsk_list_lock(jb->frames); // against put()
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// is it still acceptable to wait for missing packets?
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if(jb->frames_count < jb->latency_max){
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frame = (const tdav_video_frame_t*)jb->frames->head->data;
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if(!tdav_video_frame_is_complete(frame, jb->decode_last_seq_num_with_mark, &missing_seq_num_start, &missing_seq_num_count)){
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TSK_DEBUG_INFO("Time to decode frame...but some RTP packets are missing (missing_seq_num_start=%hu, missing_seq_num_count=%u, last_seq_num_with_mark=%d). Postpone :(", missing_seq_num_start, missing_seq_num_count, jb->decode_last_seq_num_with_mark);
|
|
// signal to the session that a sequence number is missing (will send a NACK)
|
|
// the missing seqnum has been already requested in jb_put() and here we request it again only ONE time
|
|
if(jb->callback){
|
|
if(prev_missing_seq_num_start != missing_seq_num_start || prev_lasted_missing_seq_num_count != missing_seq_num_count){ // guard to request it only once
|
|
jb->cb_data_any.type = tdav_video_jb_cb_data_type_fl;
|
|
jb->cb_data_any.ssrc = frame->ssrc;
|
|
jb->cb_data_any.fl.seq_num = prev_missing_seq_num_start = missing_seq_num_start;
|
|
jb->cb_data_any.fl.count = prev_lasted_missing_seq_num_count = missing_seq_num_count;
|
|
jb->callback(&jb->cb_data_any);
|
|
}
|
|
postpone = tsk_true;
|
|
}
|
|
}
|
|
}
|
|
else{
|
|
TSK_DEBUG_INFO("frames_count(%lld)>=latency_max(%u)...decoding video frame even if pkts are missing :(", jb->frames_count, jb->latency_max);
|
|
jb->decode_last_seq_num_with_mark = -1; // unset()
|
|
}
|
|
if(!postpone){
|
|
item = tsk_list_pop_first_item(jb->frames);
|
|
--jb->frames_count;
|
|
}
|
|
tsk_list_unlock(jb->frames);
|
|
tsk_safeobj_unlock(jb);
|
|
|
|
if(item){
|
|
jb->decode_last_timestamp = ((const tdav_video_frame_t*)item->data)->timestamp;
|
|
if(jb->callback){
|
|
trtp_rtp_packet_t* pkt;
|
|
const tsk_list_item_t* _item = item; // save memory address as "tsk_list_foreach() will change it for each loop"
|
|
int32_t last_seq_num = -1; // guard against duplicated packets
|
|
frame = _item->data;
|
|
tsk_list_foreach(_item, frame->pkts){
|
|
if(!(pkt = _item->data) || !pkt->payload.size || !pkt->header || pkt->header->seq_num == last_seq_num || !jb->started){
|
|
TSK_DEBUG_ERROR("Skipping invalid rtp packet (do not decode!)");
|
|
continue;
|
|
}
|
|
jb->cb_data_rtp.rtp.pkt = pkt;
|
|
jb->callback(&jb->cb_data_rtp);
|
|
if(pkt->header->marker){
|
|
jb->decode_last_seq_num_with_mark = pkt->header->seq_num;
|
|
}
|
|
}
|
|
}
|
|
|
|
TSK_OBJECT_SAFE_FREE(item);
|
|
}
|
|
}
|
|
|
|
#if 1
|
|
now = tsk_time_now();
|
|
if(jb->frames_count > jb->latency_max){
|
|
x_decode_time = now;
|
|
next_decode_duration = 0;
|
|
}
|
|
else{
|
|
delay = ( (now > x_decode_time) ? (now - x_decode_time) : (x_decode_duration >> 1)/* do not use zero to avoid endless loop when there is no frame to display */ );
|
|
next_decode_duration = (delay > x_decode_duration) ? 0 : (x_decode_duration - delay);
|
|
x_decode_duration = (1000 / jb->fps);
|
|
x_decode_time += x_decode_duration;
|
|
}
|
|
//delay = /*(now - x_decode_time);*/(now > x_decode_time) ? (now - x_decode_time) : ( (jb->frames_count >= jb->latency_max) ? 0 : (x_decode_duration >> 1) )/* do not use zero to avoid endless loop when there is no frame to display */;
|
|
// delay = (jb->frames_count > jb->latency_max) ? 0 : ( (now > x_decode_time) ? (now - x_decode_time) : (x_decode_duration >> 1)/* do not use zero to avoid endless loop when there is no frame to display */ );
|
|
// comparison used as guard against time wrapping
|
|
/*if(delay > __toomuch_delay_to_be_valid){
|
|
TSK_DEBUG_INFO("Too much delay (%llu) in video jb. Reseting...", delay);
|
|
x_decode_time = now;
|
|
next_decode_duration = 0;
|
|
}
|
|
else*/{
|
|
//next_decode_duration = (delay > x_decode_duration) ? 0 : (x_decode_duration - delay);
|
|
//x_decode_duration = (1000 / jb->fps);
|
|
//x_decode_time += x_decode_duration;
|
|
}
|
|
|
|
|
|
//TSK_DEBUG_INFO("next_decode_timeout=%llu, delay = %llu", next_decode_duration, delay);
|
|
#else
|
|
next_decode_duration = (1000 / jb->fps);
|
|
#endif
|
|
}
|
|
|
|
TSK_DEBUG_INFO("Video jitter buffer thread - EXIT");
|
|
|
|
return tsk_null;
|
|
}
|