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linear dither now working

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This commit is contained in:
Josh Coalson
2002-08-22 07:26:53 +00:00
parent 9fb180bc85
commit 974db5d6df
1 changed files with 34 additions and 5 deletions
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39
src/plugin_winamp2/in_flac.c
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@@ -29,6 +29,13 @@
#include "in2.h"
#include "FLAC/all.h"
#ifdef max
#undef max
#endif
#define max(a,b) ((a)>(b)?(a):(b))
#define FLAC__DO_DITHER
#define MAX_SUPPORTED_CHANNELS 2
@@ -87,7 +94,7 @@ DWORD WINAPI __stdcall DecodeThread(void *b); /* the decode thread procedure */
/* 32-bit pseudo-random number generator */
static /*inline*/ FLAC__uint32 prng(FLAC__uint32 state)
static __inline FLAC__uint32 prng(FLAC__uint32 state)
{
return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL;
}
@@ -99,7 +106,7 @@ typedef struct {
FLAC__int32 random;
} dither_state;
static /*inline*/ FLAC__int32 linear_dither(unsigned source_bps, unsigned target_bps, FLAC__int32 sample, dither_state *dither, const FLAC__int32 MIN, const FLAC__int32 MAX)
static __inline FLAC__int32 linear_dither(unsigned source_bps, unsigned target_bps, FLAC__int32 sample, dither_state *dither, const FLAC__int32 MIN, const FLAC__int32 MAX)
{
unsigned scalebits;
FLAC__int32 output, mask, random;
@@ -282,6 +289,11 @@ int play(char *fn)
int maxlatency;
int thread_id;
HANDLE input_file = INVALID_HANDLE_VALUE;
#ifdef FLAC__DO_DITHER
const unsigned output_bits_per_sample = 16;
#else
const unsigned output_bits_per_sample = file_info_.bits_per_sample;
#endif
if(0 == decoder_) {
return 1;
@@ -303,7 +315,7 @@ int play(char *fn)
seek_needed_ = -1;
wide_samples_in_reservoir_ = 0;
maxlatency = mod_.outMod->Open(file_info_.sample_rate, file_info_.channels, file_info_.bits_per_sample, -1, -1);
maxlatency = mod_.outMod->Open(file_info_.sample_rate, file_info_.channels, output_bits_per_sample, -1, -1);
if(maxlatency < 0) { /* error opening device */
return 1;
}
@@ -461,7 +473,11 @@ DWORD WINAPI __stdcall DecodeThread(void *b)
done = 1;
}
else {
#ifdef FLAC__DO_DITHER
const unsigned target_bps = 16;
#else
const unsigned target_bps = bits_per_sample;
#endif
const unsigned n = min(wide_samples_in_reservoir_, 576);
const unsigned delta = n * channels;
int bytes = (int)pack_pcm(sample_buffer_, reservoir_, n, channels, bits_per_sample, target_bps);
@@ -564,6 +580,11 @@ FLAC__bool safe_decoder_init_(const char *filename, FLAC__FileDecoder *decoder)
return false;
}
if(file_info_.abort_flag) {
/* metadata callback already popped up the error dialog */
return false;
}
return true;
}
@@ -612,11 +633,19 @@ void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMeta
file_info_->channels = metadata->data.stream_info.channels;
file_info_->sample_rate = metadata->data.stream_info.sample_rate;
if(file_info_->bits_per_sample != 16) {
MessageBox(mod_.hMainWindow, "ERROR: plugin can only handle 16-bit samples\n", "ERROR: plugin can only handle 16-bit samples", 0);
#ifdef FLAC__DO_DITHER
if(file_info_->bits_per_sample != 16 && file_info_->bits_per_sample != 24) {
MessageBox(mod_.hMainWindow, "ERROR: plugin can only handle 16/24-bit samples\n", "ERROR: plugin can only handle 16/24-bit samples", 0);
file_info_->abort_flag = true;
return;
}
#else
if(file_info_->bits_per_sample != 8 && file_info_->bits_per_sample != 16 && file_info_->bits_per_sample != 24) {
MessageBox(mod_.hMainWindow, "ERROR: plugin can only handle 8/16/24-bit samples\n", "ERROR: plugin can only handle 8/16/24-bit samples", 0);
file_info_->abort_flag = true;
return;
}
#endif
file_info_->length_in_ms = file_info_->total_samples * 10 / (file_info_->sample_rate / 100);
}
}