mirror of
https://github.com/kevinbentley/Descent3.git
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126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "audio_encode.h"
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#include "mono.h"
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#include "Aencode.h"
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long aenc_ReadSamp(void *data)
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{
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FILE *f = (FILE *)data;
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int a,b;
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a = getc(f);
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if (a==EOF)
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return ReadSampleEof;
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b = getc(f);
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if (b==EOF)
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return ReadSampleEof;
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return (short)((b<<8) + a);
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}
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int aenc_Compress(char *input_filename,char *output_filename,int *input_levels,int *input_samples,int *input_rate,int *input_channels,float *input_factor,float *input_volscale)
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{
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FILE *in, *out;
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long result;
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int levels, samples_per_subband;
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unsigned sample_rate, channels;
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float factor, volume_scale;
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int levels_set=0, samples_per_subband_set=0, sample_rate_set=0,
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channels_set=0, factor_set=0, volume_scale_set=0;
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in = fopen(input_filename, "rb");
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if (!in){
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mprintf((0,"AENC: Unable to open %s for input.\n", input_filename));
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return 0;
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}
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if(input_levels){
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levels = *input_levels; //Levels (default 7 or for 2k total)
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levels_set = 1;
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if (levels < 0 || levels > 16){
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mprintf((0,"AENC: Warning: levels outside of the range 0 to 16\n"));
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}
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}
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if(input_samples){
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samples_per_subband = *input_samples; //Samples per subband (default 16 or for 2k total)
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samples_per_subband_set = 1;
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if (samples_per_subband < 1 || samples_per_subband > 1024){
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mprintf((0,"AENC: Warning: samples per subband not in the range 1 to 1024\n"));
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}
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}
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if(input_rate){
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sample_rate = *input_rate; //Sample rate (default 22K)
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sample_rate_set = 1;
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if (sample_rate != 11025 && sample_rate != 22050 && sample_rate != 44100){
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mprintf((0,"AENC: Warning: sample rate not 11025, 22050, or 44100\n"));
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}
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}
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if(input_channels){
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channels = *input_channels;
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channels_set = 1;
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if (channels!=1 && channels!=2){
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mprintf((0,"AENC: Warning: /C channels not 1 or 2\n"));
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}
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}
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if(input_factor){
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factor = *input_factor;// Factor of compression (default 4 for 22K, 8 for 44K)
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factor_set = 1;
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if (factor < 1.0f && factor)
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factor = 1.0f/factor;
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if (factor <= 0.0f){
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mprintf((0,"AENC: Warning: compression factor <= 0.0\n"));
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factor = 1.0f;
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}
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}
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if(input_volscale){
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volume_scale = *input_volscale;// Volume scaling (slightly <= 1.0, default ,97)
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volume_scale_set = 1;
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}
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if (!levels_set && !samples_per_subband_set)
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{
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levels=7, samples_per_subband=16;
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}
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else if (!samples_per_subband_set)
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{
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samples_per_subband = 2048 / (1<<levels);
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if (samples_per_subband < 8)
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samples_per_subband = 8;
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}
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else if (!levels_set)
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{
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unsigned subbands = (2048 / samples_per_subband)>>1;
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for (levels=0; subbands; subbands>>=1, ++levels);
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}
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if (!sample_rate_set) sample_rate = 22050;
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if (!channels_set) channels = 1;
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if (!factor_set) factor = sample_rate<=22050?4.0f:8.0f;
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if (!volume_scale_set) volume_scale = .97f;
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out = fopen(output_filename, "wb");
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if (!out){
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mprintf((0,"AENC: Unable to open %s for output.\n", output_filename));
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return 0;
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}
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result = AudioEncode( aenc_ReadSamp, in, channels, sample_rate, volume_scale, out, levels, samples_per_subband, 1.0f/factor );
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fclose(out);
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fclose(in);
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return 1;
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}
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