Utility functions (CRC calc & float->int converters)

[imported from MPlayer, based on a52dec's libao]

Originally committed as revision 1780 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 45 insertions, 0 deletions

diff --git a/libavcodec/liba52/resample.c b/libavcodec/liba52/resample.c
new file mode 100644
index 0000000..284cbbe
--- /dev/null
+++ b/libavcodec/liba52/resample.c
@@ -0,0 +1,45 @@
+
+// a52_resample_init should find the requested converter (from type flags ->
+// given number of channels) and set up some function pointers...
+
+// a52_resample() should do the conversion.
+
+#include <inttypes.h>
+#include <stdio.h>
+#include "a52.h"
+#include "mm_accel.h"
+#include "config.h"
+#include "../libpostproc/mangle.h"
+
+int (* a52_resample) (float * _f, int16_t * s16)=NULL;
+
+#include "resample_c.c"
+
+#ifdef ARCH_X86
+#include "resample_mmx.c"
+#endif
+
+void* a52_resample_init(uint32_t mm_accel,int flags,int chans){
+void* tmp;
+
+#ifdef ARCH_X86
+    if(mm_accel&MM_ACCEL_X86_MMX){
+	tmp=a52_resample_MMX(flags,chans);
+	if(tmp){
+	    if(a52_resample==NULL) fprintf(stderr, "Using MMX optimized resampler\n");
+	    a52_resample=tmp;
+	    return tmp;
+	}
+    }
+#endif
+
+    tmp=a52_resample_C(flags,chans);
+    if(tmp){
+	if(a52_resample==NULL) fprintf(stderr, "No accelerated resampler found\n");
+	a52_resample=tmp;
+	return tmp;
+    }
+    
+    fprintf(stderr, "Unimplemented resampler for mode 0x%X -> %d channels conversion - Contact MPlayer developers!\n", flags, chans);
+    return NULL;
+}