From df4e79f7f7b1c5f62fdb80575bab6ce1b2be7928 Mon Sep 17 00:00:00 2001 From: Paul Wilkins Date: Fri, 16 Dec 2011 10:23:01 +0000 Subject: [PATCH] Extend to 256 Q steps. This commit extends the number of Q steps to 256 from 128. The q_trans[] array has been altered to distribute available Q index values (using the current 64 steps available as input parameters) evenly across the available range. This is coupled with the fact that each Q step where possible now equates to a fixed % change in the quantizer. This may want refinement later especially in terms of the granularity at the high quality end but is a reasonable starting point. Change-Id: I2aaa6874fa10ce05c958dd182947ce39f6f1eecb --- vp8/common/onyxc_int.h | 6 +++--- vp8/common/quant_common.c | 7 ++++--- vp8/encoder/onyx_if.c | 6 +++--- 3 files changed, 10 insertions(+), 9 deletions(-) diff --git a/vp8/common/onyxc_int.h b/vp8/common/onyxc_int.h index 64c305a8d..0e078ebb8 100644 --- a/vp8/common/onyxc_int.h +++ b/vp8/common/onyxc_int.h @@ -33,13 +33,13 @@ void vp8_initialize_common(void); #define MINQ 0 -/*#if CONFIG_EXTEND_QRANGE +#if CONFIG_EXTEND_QRANGE #define MAXQ 255 #define QINDEX_BITS 8 -#else*/ +#else #define MAXQ 127 #define QINDEX_BITS 7 -//#endif +#endif #define QINDEX_RANGE (MAXQ + 1) diff --git a/vp8/common/quant_common.c b/vp8/common/quant_common.c index 6c81607cc..f3569f962 100644 --- a/vp8/common/quant_common.c +++ b/vp8/common/quant_common.c @@ -89,7 +89,8 @@ void vp8_init_quant_tables() { ac_qlookup[i] = current_val; //current_val = (int)((double)current_val * 1.045); - current_val = (int)((double)current_val * 1.04); + //current_val = (int)((double)current_val * 1.04); + current_val = (int)((double)current_val * 1.018); if ( current_val == last_val ) current_val++; last_val = current_val; @@ -99,8 +100,8 @@ void vp8_init_quant_tables() dc_qlookup[i] = (0.000000305 * ac_val * ac_val * ac_val) + (-0.00065 * ac_val * ac_val) + (0.9 * ac_val) + 0.5; - if ( dc_qlookup[i] > dc_max ) - dc_qlookup[i] = dc_max; + //if ( dc_qlookup[i] > dc_max ) + // dc_qlookup[i] = dc_max; if ( dc_qlookup[i] < ACDC_MIN ) dc_qlookup[i] = ACDC_MIN; } diff --git a/vp8/encoder/onyx_if.c b/vp8/encoder/onyx_if.c index 9a5ce38a6..fe8f1ab78 100644 --- a/vp8/encoder/onyx_if.c +++ b/vp8/encoder/onyx_if.c @@ -1857,7 +1857,7 @@ void vp8_alloc_compressor_data(VP8_COMP *cpi) // // Table that converts 0-63 Q range values passed in outside to the Qindex // range used internally. -/*#if CONFIG_EXTEND_QRANGE +#if CONFIG_EXTEND_QRANGE static const int q_trans[] = { 0, 4, 8, 12, 16, 20, 24, 28, @@ -1869,7 +1869,7 @@ static const int q_trans[] = 192, 196, 200, 204, 208, 212, 216, 220, 224, 228, 232, 236, 240, 244, 249, 255, }; -#else*/ +#else static const int q_trans[] = { 0, 1, 2, 3, 4, 5, 7, 8, @@ -1881,7 +1881,7 @@ static const int q_trans[] = 82, 85, 88, 91, 94, 97, 100, 103, 106, 109, 112, 115, 118, 121, 124, 127, }; -//#endif +#endif int vp8_reverse_trans(int x) { -- 2.40.0