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75 lines
1.7 KiB
75 lines
1.7 KiB
#ifndef _AmPlayoutBuffer_h_
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#define _AmPlayoutBuffer_h_
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#include "SampleArray.h"
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#include "AmStats.h"
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#include "LowcFE.h"
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#include <set>
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using std::multiset;
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#define ORDER_STAT_WIN_SIZE 35
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#define ORDER_STAT_LOSS_RATE 0.1
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#define EXP_THRESHOLD 20
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#define SHR_THRESHOLD 180
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#define WSOLA_START_OFF 80
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#define WSOLA_SCALED_WIN 50
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/** \brief base class for Playout buffer */
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class AmPlayoutBuffer
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{
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// Playout buffer
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SampleArrayShort buffer;
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protected:
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u_int32_t r_ts,w_ts;
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void buffer_put(unsigned int ts, ShortSample* buf, unsigned int len);
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void buffer_get(unsigned int ts, ShortSample* buf, unsigned int len);
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public:
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AmPlayoutBuffer();
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virtual ~AmPlayoutBuffer() {}
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virtual void direct_write(unsigned int ts, ShortSample* buf, unsigned int len);
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virtual void write(u_int32_t ref_ts, u_int32_t ts, int16_t* buf, u_int32_t len);
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virtual u_int32_t read(u_int32_t ts, int16_t* buf, u_int32_t len);
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};
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/** \brief adaptive playout buffer */
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class AmAdaptivePlayout: public AmPlayoutBuffer
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{
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// Order statistics delay estimation
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multiset<int32_t> o_stat;
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int32_t n_stat[ORDER_STAT_WIN_SIZE];
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int idx;
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double loss_rate;
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// adaptive WSOLA
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u_int32_t wsola_off;
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int shr_threshold;
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MeanArray short_scaled;
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// second stage PLC
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int plc_cnt;
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LowcFE fec;
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u_int32_t time_scale(u_int32_t ts, float factor);
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u_int32_t next_delay(u_int32_t ref_ts, u_int32_t ts);
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public:
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AmAdaptivePlayout();
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void direct_write(unsigned int ts, ShortSample* buf, unsigned int len);
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void write(u_int32_t ref_ts, u_int32_t ts, int16_t* buf, u_int32_t len);
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u_int32_t read(u_int32_t ts, int16_t* buf, u_int32_t len);
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};
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#endif
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