1 files changed, 64 insertions, 0 deletions
diff --git a/src/libmpg123/synth_mono.h b/src/libmpg123/synth_mono.h
new file mode 100644
index 0000000..907aa25
--- /dev/null
+++ b/src/libmpg123/synth_mono.h
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+/*
+	monosynth.h: generic mono related synth functions 
+
+	copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
+	see COPYING and AUTHORS files in distribution or http://mpg123.org
+	initially written by Michael Hipp, generalized by Thomas Orgis
+
+	This header is used multiple times to create different variants of these functions.
+	See decode.c and synth.h .
+	Hint: BLOCK, MONO_NAME, MONO2STEREO_NAME, SYNTH_NAME and SAMPLE_T do vary.
+
+	Thomas looked closely at the decode_1to1, decode_2to1 and decode_4to1 contents, seeing that they are too similar to be separate files.
+	This is what resulted...
+
+	Reason to separate this from synth.h:
+	There are decoders that have a special synth_1to1 but still can use these generic derivations for the mono stuff.
+	It generally makes a good deal of sense to set SYNTH_NAME to opt_synth_1to1(fr) (or opt_synth_2to1(fr), etc.).
+*/
+
+/* Mono synth, wrapping over SYNTH_NAME */
+int MONO_NAME(real *bandPtr, mpg123_handle *fr)
+{
+	SAMPLE_T samples_tmp[BLOCK];
+	SAMPLE_T *tmp1 = samples_tmp;
+	int i,ret;
+
+	/* save buffer stuff, trick samples_tmp into there, decode, restore */
+	unsigned char *samples = fr->buffer.data;
+	int pnt = fr->buffer.fill;
+	fr->buffer.data = (unsigned char*) samples_tmp;
+	fr->buffer.fill = 0;
+	ret = SYNTH_NAME(bandPtr, 0, fr, 0); /* decode into samples_tmp */
+	fr->buffer.data = samples; /* restore original value */
+
+	/* now append samples from samples_tmp */
+	samples += pnt; /* just the next mem in frame buffer */
+	for(i=0;i<(BLOCK/2);i++)
+	{
+		*( (SAMPLE_T *)samples) = *tmp1;
+		samples += sizeof(SAMPLE_T);
+		tmp1 += 2;
+	}
+	fr->buffer.fill = pnt + (BLOCK/2)*sizeof(SAMPLE_T);
+
+	return ret;
+}
+
+/* Mono to stereo synth, wrapping over SYNTH_NAME */
+int MONO2STEREO_NAME(real *bandPtr, mpg123_handle *fr)
+{
+	int i,ret;
+	unsigned char *samples = fr->buffer.data;
+
+	ret = SYNTH_NAME(bandPtr,0,fr,1);
+	samples += fr->buffer.fill - BLOCK*sizeof(SAMPLE_T);
+
+	for(i=0;i<(BLOCK/2);i++)
+	{
+		((SAMPLE_T *)samples)[1] = ((SAMPLE_T *)samples)[0];
+		samples+=2*sizeof(SAMPLE_T);
+	}
+
+	return ret;
+}