[FFmpeg-cvslog] r14958 - in trunk/libavcodec: ac3dec_data.c ac3dec_data.h
jbr
subversion
Mon Aug 25 02:15:29 CEST 2008
Author: jbr
Date: Mon Aug 25 02:15:29 2008
New Revision: 14958
Log:
right shift the values by 8 in GAQ remap "B" table. data now fits in int8_t.
Modified:
trunk/libavcodec/ac3dec_data.c
trunk/libavcodec/ac3dec_data.h
Modified: trunk/libavcodec/ac3dec_data.c
==============================================================================
--- trunk/libavcodec/ac3dec_data.c (original)
+++ trunk/libavcodec/ac3dec_data.c Mon Aug 25 02:15:29 2008
@@ -87,18 +87,19 @@ const int16_t ff_eac3_gaq_remap_2_4_a[9]
/**
* Table E3.6, Gk=2 & Gk=4, B
* Large mantissa inverse quantization, negative mantissa remapping offsets
+ * Table values from the spec are right-shifted by 8 to simplify calculations.
* ff_eac3_gaq_remap_3_4_b[hebap-8][Gk=2,4]
*/
-const int16_t ff_eac3_gaq_remap_2_4_b[9][2] = {
- { -5461, -1170},
- { -11703, -4915},
- { -14199, -6606},
- { -15327, -7412},
- { -15864, -7805},
- { -16126, -7999},
- { -16255, -8096},
- { -16320, -8144},
- { -16352, -8168}
+const int8_t ff_eac3_gaq_remap_2_4_b[9][2] = {
+ { -22, -5 },
+ { -46, -20 },
+ { -56, -26 },
+ { -60, -29 },
+ { -62, -31 },
+ { -63, -32 },
+ { -64, -32 },
+ { -64, -32 },
+ { -64, -32 },
};
static const int16_t vq_hebap1[4][6] = {
Modified: trunk/libavcodec/ac3dec_data.h
==============================================================================
--- trunk/libavcodec/ac3dec_data.h (original)
+++ trunk/libavcodec/ac3dec_data.h Mon Aug 25 02:15:29 2008
@@ -29,7 +29,7 @@ extern const uint8_t ff_eac3_hebap_tab[6
extern const uint8_t ff_eac3_bits_vs_hebap[20];
extern const int16_t ff_eac3_gaq_remap_1[12];
extern const int16_t ff_eac3_gaq_remap_2_4_a[9][2];
-extern const int16_t ff_eac3_gaq_remap_2_4_b[9][2];
+extern const int8_t ff_eac3_gaq_remap_2_4_b[9][2];
extern const int16_t (*ff_eac3_vq_hebap[8])[6];
extern const uint8_t ff_eac3_frm_expstr[32][6];
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