134 lines
2.7 KiB
C++
134 lines
2.7 KiB
C++
#ifndef AUDIO_RB_RESAMPLER_H
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#define AUDIO_RB_RESAMPLER_H
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#include "typedefs.h"
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#include "os/memory.h"
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struct AudioRBResampler {
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uint32_t rb_bits;
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uint32_t rb_len;
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uint32_t rb_mask;
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uint32_t read_buff_len;
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uint32_t channels;
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uint32_t src_mix_rate;
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uint32_t target_mix_rate;
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volatile int rb_read_pos;
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volatile int rb_write_pos;
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int32_t offset; //contains the fractional remainder of the resampler
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enum {
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MIX_FRAC_BITS=13,
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MIX_FRAC_LEN=(1<<MIX_FRAC_BITS),
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MIX_FRAC_MASK=MIX_FRAC_LEN-1,
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};
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int16_t *read_buf;
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int16_t *rb;
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template<int C>
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uint32_t _resample(int32_t *p_dest,int p_todo,int32_t p_increment);
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public:
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_FORCE_INLINE_ void flush() {
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rb_read_pos=0;
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rb_write_pos=0;
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}
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_FORCE_INLINE_ bool is_ready() const{
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return rb!=NULL;
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}
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_FORCE_INLINE_ int get_total() const {
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return rb_len-1;
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}
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_FORCE_INLINE_ int get_todo() const { //return amount of frames to mix
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int todo;
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int read_pos_cache=rb_read_pos;
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if (read_pos_cache==rb_write_pos) {
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todo=rb_len-1;
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} else if (read_pos_cache>rb_write_pos) {
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todo=read_pos_cache-rb_write_pos-1;
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} else {
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todo=(rb_len-rb_write_pos)+read_pos_cache-1;
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}
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return todo;
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}
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_FORCE_INLINE_ int16_t *get_write_buffer() { return read_buf; }
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_FORCE_INLINE_ void write(uint32_t p_frames) {
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ERR_FAIL_COND(p_frames >= rb_len);
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switch(channels) {
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case 1: {
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for(uint32_t i=0;i<p_frames;i++) {
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rb[ rb_write_pos ] = read_buf[i];
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rb_write_pos=(rb_write_pos+1)&rb_mask;
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}
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} break;
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case 2: {
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for(uint32_t i=0;i<p_frames;i++) {
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rb[ (rb_write_pos<<1)+0 ] = read_buf[(i<<1)+0];
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rb[ (rb_write_pos<<1)+1 ] = read_buf[(i<<1)+1];
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rb_write_pos=(rb_write_pos+1)&rb_mask;
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}
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} break;
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case 4: {
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for(uint32_t i=0;i<p_frames;i++) {
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rb[ (rb_write_pos<<2)+0 ] = read_buf[(i<<2)+0];
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rb[ (rb_write_pos<<2)+1 ] = read_buf[(i<<2)+1];
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rb[ (rb_write_pos<<2)+2 ] = read_buf[(i<<2)+2];
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rb[ (rb_write_pos<<2)+3 ] = read_buf[(i<<2)+3];
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rb_write_pos=(rb_write_pos+1)&rb_mask;
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}
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} break;
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case 6: {
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for(uint32_t i=0;i<p_frames;i++) {
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rb[ (rb_write_pos*6)+0 ] = read_buf[(i*6)+0];
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rb[ (rb_write_pos*6)+1 ] = read_buf[(i*6)+1];
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rb[ (rb_write_pos*6)+2 ] = read_buf[(i*6)+2];
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rb[ (rb_write_pos*6)+3 ] = read_buf[(i*6)+3];
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rb[ (rb_write_pos*6)+4 ] = read_buf[(i*6)+4];
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rb[ (rb_write_pos*6)+5 ] = read_buf[(i*6)+5];
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rb_write_pos=(rb_write_pos+1)&rb_mask;
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}
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} break;
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}
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}
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int get_channel_count() const;
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Error setup(int p_channels, int p_src_mix_rate, int p_target_mix_rate, int p_buffer_msec, int p_minbuff_needed=-1);
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void clear();
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bool mix(int32_t *p_dest, int p_frames);
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AudioRBResampler();
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~AudioRBResampler();
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};
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#endif // AUDIO_RB_RESAMPLER_H
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