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path: root/servers/audio/audio_rb_resampler.cpp
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Diffstat (limited to 'servers/audio/audio_rb_resampler.cpp')
-rw-r--r--servers/audio/audio_rb_resampler.cpp356
1 files changed, 356 insertions, 0 deletions
diff --git a/servers/audio/audio_rb_resampler.cpp b/servers/audio/audio_rb_resampler.cpp
new file mode 100644
index 0000000000..d07d55f1b5
--- /dev/null
+++ b/servers/audio/audio_rb_resampler.cpp
@@ -0,0 +1,356 @@
+#include "audio_rb_resampler.h"
+
+
+int AudioRBResampler::get_channel_count() const {
+
+ if (!rb)
+ return 0;
+
+ return channels;
+}
+
+
+template<int C>
+uint32_t AudioRBResampler::_resample(int32_t *p_dest,int p_todo,int32_t p_increment) {
+
+ uint32_t read=offset&MIX_FRAC_MASK;
+
+ for (int i=0;i<p_todo;i++) {
+
+ offset = (offset + p_increment)&(((1<<(rb_bits+MIX_FRAC_BITS))-1));
+ read+=p_increment;
+ uint32_t pos = offset >> MIX_FRAC_BITS;
+ uint32_t frac = offset & MIX_FRAC_MASK;
+#ifndef FAST_AUDIO
+ ERR_FAIL_COND_V(pos>=rb_len,0);
+#endif
+ uint32_t pos_next = (pos+1)&rb_mask;
+ //printf("rb pos %i\n",pos);
+
+ // since this is a template with a known compile time value (C), conditionals go away when compiling.
+ if (C==1) {
+
+ int32_t v0 = rb[pos];
+ int32_t v0n=rb[pos_next];
+#ifndef FAST_AUDIO
+ v0+=(v0n-v0)*(int32_t)frac >> MIX_FRAC_BITS;
+#endif
+ v0<<=16;
+ p_dest[i]=v0;
+
+ }
+ if (C==2) {
+
+ int32_t v0 = rb[(pos<<1)+0];
+ int32_t v1 = rb[(pos<<1)+1];
+ int32_t v0n=rb[(pos_next<<1)+0];
+ int32_t v1n=rb[(pos_next<<1)+1];
+
+#ifndef FAST_AUDIO
+ v0+=(v0n-v0)*(int32_t)frac >> MIX_FRAC_BITS;
+ v1+=(v1n-v1)*(int32_t)frac >> MIX_FRAC_BITS;
+#endif
+ v0<<=16;
+ v1<<=16;
+ p_dest[(i<<1)+0]=v0;
+ p_dest[(i<<1)+1]=v1;
+
+ }
+
+ if (C==4) {
+
+ int32_t v0 = rb[(pos<<2)+0];
+ int32_t v1 = rb[(pos<<2)+1];
+ int32_t v2 = rb[(pos<<2)+2];
+ int32_t v3 = rb[(pos<<2)+3];
+ int32_t v0n = rb[(pos_next<<2)+0];
+ int32_t v1n=rb[(pos_next<<2)+1];
+ int32_t v2n=rb[(pos_next<<2)+2];
+ int32_t v3n=rb[(pos_next<<2)+3];
+
+#ifndef FAST_AUDIO
+ v0+=(v0n-v0)*(int32_t)frac >> MIX_FRAC_BITS;
+ v1+=(v1n-v1)*(int32_t)frac >> MIX_FRAC_BITS;
+ v2+=(v2n-v2)*(int32_t)frac >> MIX_FRAC_BITS;
+ v3+=(v3n-v3)*(int32_t)frac >> MIX_FRAC_BITS;
+#endif
+ v0<<=16;
+ v1<<=16;
+ v2<<=16;
+ v3<<=16;
+ p_dest[(i<<2)+0]=v0;
+ p_dest[(i<<2)+1]=v1;
+ p_dest[(i<<2)+2]=v2;
+ p_dest[(i<<2)+3]=v3;
+
+ }
+
+ if (C==6) {
+
+ int32_t v0 = rb[(pos*6)+0];
+ int32_t v1 = rb[(pos*6)+1];
+ int32_t v2 = rb[(pos*6)+2];
+ int32_t v3 = rb[(pos*6)+3];
+ int32_t v4 = rb[(pos*6)+4];
+ int32_t v5 = rb[(pos*6)+5];
+ int32_t v0n = rb[(pos_next*6)+0];
+ int32_t v1n=rb[(pos_next*6)+1];
+ int32_t v2n=rb[(pos_next*6)+2];
+ int32_t v3n=rb[(pos_next*6)+3];
+ int32_t v4n=rb[(pos_next*6)+4];
+ int32_t v5n=rb[(pos_next*6)+5];
+
+#ifndef FAST_AUDIO
+ v0+=(v0n-v0)*(int32_t)frac >> MIX_FRAC_BITS;
+ v1+=(v1n-v1)*(int32_t)frac >> MIX_FRAC_BITS;
+ v2+=(v2n-v2)*(int32_t)frac >> MIX_FRAC_BITS;
+ v3+=(v3n-v3)*(int32_t)frac >> MIX_FRAC_BITS;
+ v4+=(v4n-v4)*(int32_t)frac >> MIX_FRAC_BITS;
+ v5+=(v5n-v5)*(int32_t)frac >> MIX_FRAC_BITS;
+#endif
+ v0<<=16;
+ v1<<=16;
+ v2<<=16;
+ v3<<=16;
+ v4<<=16;
+ v5<<=16;
+ p_dest[(i*6)+0]=v0;
+ p_dest[(i*6)+1]=v1;
+ p_dest[(i*6)+2]=v2;
+ p_dest[(i*6)+3]=v3;
+ p_dest[(i*6)+4]=v4;
+ p_dest[(i*6)+5]=v5;
+
+ }
+
+
+ }
+
+
+ return read>>MIX_FRAC_BITS;//rb_read_pos=offset>>MIX_FRAC_BITS;
+
+}
+
+
+bool AudioRBResampler::mix(int32_t *p_dest, int p_frames) {
+
+
+ if (!rb)
+ return false;
+
+ int write_pos_cache=rb_write_pos;
+
+ int32_t increment=(src_mix_rate*MIX_FRAC_LEN)/target_mix_rate;
+
+ int rb_todo;
+
+ if (write_pos_cache==rb_read_pos) {
+ return false; //out of buffer
+
+ } else if (rb_read_pos<write_pos_cache) {
+
+ rb_todo=write_pos_cache-rb_read_pos; //-1?
+ } else {
+
+ rb_todo=(rb_len-rb_read_pos)+write_pos_cache; //-1?
+ }
+
+ int todo = MIN( ((int64_t(rb_todo)<<MIX_FRAC_BITS)/increment)+1, p_frames );
+#if 0
+ if (int(src_mix_rate)==target_mix_rate) {
+
+
+ if (channels==6) {
+
+ for(int i=0;i<p_frames;i++) {
+
+ int from = ((rb_read_pos+i)&rb_mask)*6;
+ int to = i*6;
+
+ p_dest[from+0]=int32_t(rb[to+0])<<16;
+ p_dest[from+1]=int32_t(rb[to+1])<<16;
+ p_dest[from+2]=int32_t(rb[to+2])<<16;
+ p_dest[from+3]=int32_t(rb[to+3])<<16;
+ p_dest[from+4]=int32_t(rb[to+4])<<16;
+ p_dest[from+5]=int32_t(rb[to+5])<<16;
+ }
+
+ } else {
+ int len=p_frames*channels;
+ int from=rb_read_pos*channels;
+ int mask=0;
+ switch(channels) {
+ case 1: mask=rb_len-1; break;
+ case 2: mask=(rb_len*2)-1; break;
+ case 4: mask=(rb_len*4)-1; break;
+ }
+
+ for(int i=0;i<len;i++) {
+
+ p_dest[i]=int32_t(rb[(from+i)&mask])<<16;
+ }
+ }
+
+ rb_read_pos = (rb_read_pos+p_frames)&rb_mask;
+ } else
+#endif
+ {
+
+ uint32_t read=0;
+ switch(channels) {
+ case 1: read=_resample<1>(p_dest,todo,increment); break;
+ case 2: read=_resample<2>(p_dest,todo,increment); break;
+ case 4: read=_resample<4>(p_dest,todo,increment); break;
+ case 6: read=_resample<6>(p_dest,todo,increment); break;
+ }
+#if 1
+ //end of stream, fadeout
+ int remaining = p_frames-todo;
+ if (remaining && todo>0) {
+
+ //print_line("fadeout");
+ for(int c=0;c<channels;c++) {
+
+ for(int i=0;i<todo;i++) {
+
+ int32_t samp = p_dest[i*channels+c]>>8;
+ uint32_t mul = (todo-i) * 256 /todo;
+ //print_line("mul: "+itos(i)+" "+itos(mul));
+ p_dest[i*channels+c]=samp*mul;
+ }
+
+ }
+
+ }
+
+#else
+ int remaining = p_frames-todo;
+ if (remaining && todo>0) {
+
+
+ for(int c=0;c<channels;c++) {
+
+ int32_t from = p_dest[(todo-1)*channels+c]>>8;
+
+ for(int i=0;i<remaining;i++) {
+
+ uint32_t mul = (remaining-i) * 256 /remaining;
+ p_dest[(todo+i)*channels+c]=from*mul;
+ }
+
+ }
+
+ }
+#endif
+
+ //zero out what remains there to avoid glitches
+ for(int i=todo*channels;i<int(p_frames)*channels;i++) {
+
+ p_dest[i]=0;
+ }
+
+ if (read>rb_todo)
+ read=rb_todo;
+
+ rb_read_pos = (rb_read_pos+read)&rb_mask;
+
+
+
+
+ }
+
+ return true;
+}
+
+
+Error AudioRBResampler::setup(int p_channels,int p_src_mix_rate,int p_target_mix_rate,int p_buffer_msec,int p_minbuff_needed) {
+
+ ERR_FAIL_COND_V(p_channels!=1 && p_channels!=2 && p_channels!=4 && p_channels!=6,ERR_INVALID_PARAMETER);
+
+
+ //float buffering_sec = int(GLOBAL_DEF("audio/stream_buffering_ms",500))/1000.0;
+ int desired_rb_bits =nearest_shift(MAX((p_buffer_msec/1000.0)*p_src_mix_rate,p_minbuff_needed));
+
+ bool recreate=!rb;
+
+ if (rb && (uint32_t(desired_rb_bits)!=rb_bits || channels!=uint32_t(p_channels))) {
+ //recreate
+
+ memdelete_arr(rb);
+ memdelete_arr(read_buf);
+ recreate=true;
+
+ }
+
+ if (recreate) {
+
+ channels=p_channels;
+ rb_bits=desired_rb_bits;
+ rb_len=(1<<rb_bits);
+ rb_mask=rb_len-1;
+ rb = memnew_arr( int16_t, rb_len * p_channels );
+ read_buf = memnew_arr( int16_t, rb_len * p_channels );
+
+ }
+
+ src_mix_rate=p_src_mix_rate;
+ target_mix_rate=p_target_mix_rate;
+ offset=0;
+ rb_read_pos=0;
+ rb_write_pos=0;
+
+ //avoid maybe strange noises upon load
+ for (int i=0;i<(rb_len*channels);i++) {
+
+ rb[i]=0;
+ read_buf[i]=0;
+ }
+
+ return OK;
+
+}
+
+void AudioRBResampler::clear() {
+
+ if (!rb)
+ return;
+
+ //should be stopped at this point but just in case
+ if (rb) {
+ memdelete_arr(rb);
+ memdelete_arr(read_buf);
+ }
+ rb=NULL;
+ offset=0;
+ rb_read_pos=0;
+ rb_write_pos=0;
+ read_buf=NULL;
+}
+
+AudioRBResampler::AudioRBResampler() {
+
+ rb=NULL;
+ offset=0;
+ read_buf=NULL;
+ rb_read_pos=0;
+ rb_write_pos=0;
+
+ rb_bits=0;
+ rb_len=0;
+ rb_mask=0;
+ read_buff_len=0;
+ channels=0;
+ src_mix_rate=0;
+ target_mix_rate=0;
+
+}
+
+AudioRBResampler::~AudioRBResampler() {
+
+ if (rb) {
+ memdelete_arr(rb);
+ memdelete_arr(read_buf);
+ }
+
+}
+
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