diff options
Diffstat (limited to 'contrib/patch-a52dec.patch')
| -rw-r--r-- | contrib/patch-a52dec.patch | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/contrib/patch-a52dec.patch b/contrib/patch-a52dec.patch new file mode 100644 index 000000000..9eaf34ffd --- /dev/null +++ b/contrib/patch-a52dec.patch @@ -0,0 +1,114 @@ +diff -Naur a52dec_original/include/a52.h a52dec_patched/include/a52.h +--- a52dec_original/include/a52.h 2002-01-28 05:37:54.000000000 +0000 ++++ a52dec_patched/include/a52.h 2007-04-04 19:12:57.000000000 +0100 +@@ -48,6 +48,10 @@ + #define A52_LFE 16 + #define A52_ADJUST_LEVEL 32 + ++// this next constant can be ORed with A52_DOLBY to tell liba52 to use 5.0 DPLII matrix encoding, ++// rather than just 4.0 Dolby Surround matrix encoding ++#define A52_USE_DPLII 64 ++ + a52_state_t * a52_init (uint32_t mm_accel); + sample_t * a52_samples (a52_state_t * state); + int a52_syncinfo (uint8_t * buf, int * flags, +diff -Naur a52dec_original/liba52/a52_internal.h a52dec_patched/liba52/a52_internal.h +--- a52dec_original/liba52/a52_internal.h 2002-07-28 02:52:06.000000000 +0100 ++++ a52dec_patched/liba52/a52_internal.h 2007-04-04 19:11:43.000000000 +0100 +@@ -93,6 +93,10 @@ + #define LEVEL_45DB 0.5946035575013605 + #define LEVEL_6DB 0.5 + ++// these next two constants are used for DPL matrix encoding in downmix.c ++#define LEVEL_SQRT_1_2 0.5 ++#define LEVEL_SQRT_3_4 0.8660254037844386 ++ + #define EXP_REUSE (0) + #define EXP_D15 (1) + #define EXP_D25 (2) +diff -Naur a52dec_original/liba52/downmix.c a52dec_patched/liba52/downmix.c +--- a52dec_original/liba52/downmix.c 2002-01-28 05:37:54.000000000 +0000 ++++ a52dec_patched/liba52/downmix.c 2007-04-06 13:47:49.000000000 +0100 +@@ -34,6 +34,7 @@ + int a52_downmix_init (int input, int flags, sample_t * level, + sample_t clev, sample_t slev) + { ++ + static uint8_t table[11][8] = { + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO, + A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO}, +@@ -148,6 +149,9 @@ + break; + } + ++ // add the DPLII flag back into the output if it was passed in ++ output = output | (flags & A52_USE_DPLII); ++ + return output; + } + +@@ -418,17 +422,46 @@ + } + } + +-static void mix32toS (sample_t * samples, sample_t bias) ++static void mix32toS (sample_t * samples, sample_t bias, int use_dpl2) + { +- int i; +- sample_t common, surround; + +- for (i = 0; i < 256; i++) { +- common = samples[i + 256] + bias; +- surround = samples[i + 768] + samples[i + 1024]; +- samples[i] += common - surround; +- samples[i + 256] = samples[i + 512] + common + surround; +- } ++ if (use_dpl2 == 1) { ++ ++ int i; ++ sample_t cc, Lt, Rt, Ls, Rs, Lss, Rss; ++ ++ for (i = 0; i < 256; i++) { ++ ++ cc = samples[i + 256] * LEVEL_3DB; ++ ++ Lt = samples[i] + cc; ++ Rt = samples[i + 512] + cc; ++ ++ Ls = samples[i + 768]; ++ Rs = samples[i + 1024]; ++ ++ Lss = (LEVEL_SQRT_3_4 * Ls) - (LEVEL_SQRT_1_2 * Rs); ++ Rss = -(LEVEL_SQRT_1_2 * Ls) + (LEVEL_SQRT_3_4 * Rs); ++ ++ samples[i] = Lt + Lss; ++ samples[i + 256] = Rt + Rss; ++ ++ } ++ ++ } else { ++ ++ int i; ++ sample_t common, surround; ++ ++ for (i = 0; i < 256; i++) { ++ common = samples[i + 256] + bias; ++ surround = samples[i + 768] + samples[i + 1024]; ++ samples[i] += common - surround; ++ samples[i + 256] = samples[i + 512] + common + surround; ++ } ++ ++ } ++ + } + + static void move2to1 (sample_t * src, sample_t * dest, sample_t bias) +@@ -533,7 +566,7 @@ + break; + + case CONVERT (A52_3F2R, A52_DOLBY): +- mix32toS (samples, bias); ++ mix32toS (samples, bias, ((output & A52_USE_DPLII) == A52_USE_DPLII)); + break; + + case CONVERT (A52_3F1R, A52_3F): |