Author: marco
Date: Tue Aug 14 22:01:18 2007
New Revision: 790
Log:
add testing code for arithmetic coding/decoding
Modified:
dirac/libavcodec/dirac_arith.c
Modified: dirac/libavcodec/dirac_arith.c
==============================================================================
--- dirac/libavcodec/dirac_arith.c (original)
+++ dirac/libavcodec/dirac_arith.c Tue Aug 14 22:01:18 2007
@@ -282,3 +282,48 @@ void dirac_arith_coder_flush(dirac_arith
for (i = 0; i < rem; i++)
put_bits(arith->pb, 1, 0);
}
+
+#if 0
+void dirac_arith_test(void) {
+ struct dirac_arith_state arith;
+ char in[] = "**** Test arithmetic coding and decoding ****";
+ char out[100];
+ PutBitContext pb;
+ GetBitContext gb;
+ char buf[2000];
+ int i, c;
+ int length;
+
+ /* Code the string. */
+ init_put_bits(&pb, buf, sizeof(buf)*8);
+ dirac_arith_coder_init(&arith, &pb);
+ for (c = 0; c < sizeof(in); c++) {
+ for (i = 0; i < 8; i++) {
+ int bit = (in[c] >> (7 - i)) & 1;
+ dirac_arith_put_bit(&arith, bit, i);
+ }
+ }
+ dirac_arith_coder_flush(&arith);
+ flush_put_bits(&pb);
+ length = put_bits_count(&pb);
+
+ /* Now decode the string. */
+ init_get_bits(&gb, buf, sizeof(buf)*8);
+ dirac_arith_init(&arith, &gb, length);
+ for(c = 0; 1; c++) {
+ out[c] = 0;
+ for (i = 0; i < 8; i++) {
+ int bit = dirac_arith_get_bit(&arith, i);
+ out[c] = (out[c] << 1) | bit;
+ }
+ if (out[c] == 0)
+ break;
+ }
+ dirac_arith_flush(&arith);
+
+ dprintf(0, "Encoder input : `%s'\n", in);
+ dprintf(0, "Decoder output: `%s'\n", out);
+ dprintf(0, "size decoder: %d, size encoded: %d\n",
+ sizeof(in) * 8, length);
+}
+#endif
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