[SCM] libav/experimental: Change the default dB-per-bit code from 2 to 3. This gives slightly better quality in PEAQ tests. Code 3 gives a dBpb value of 2816 = -132dB (128 psd units = -6dB), which corresponds to 22 bits. Since the exponents have an offset applied, the 16-bit source looks like 24-bit source to the bit allocation routine. So using dBpb code=3 is a closer match to the exponent range.
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 17:21:04 UTC 2013
The following commit has been merged in the experimental branch:
commit ec44dd5fc2118d5f22c3c504e7d37771383e3a6e
Author: Justin Ruggles <justin.ruggles at gmail.com>
Date: Wed Dec 29 19:17:22 2010 +0000
Change the default dB-per-bit code from 2 to 3.
This gives slightly better quality in PEAQ tests.
Code 3 gives a dBpb value of 2816 = -132dB (128 psd units = -6dB), which
corresponds to 22 bits. Since the exponents have an offset applied, the
16-bit source looks like 24-bit source to the bit allocation routine.
So using dBpb code=3 is a closer match to the exponent range.
Regression test refs updated for acodec-ac3, lavf-rm, and seek-ac3_rm.
Originally committed as revision 26144 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index 94fafbc..52cb58f 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -899,7 +899,7 @@ static void bit_alloc_init(AC3EncodeContext *s)
s->slow_decay_code = 2;
s->fast_decay_code = 1;
s->slow_gain_code = 1;
- s->db_per_bit_code = 2;
+ s->db_per_bit_code = 3;
s->floor_code = 4;
for (ch = 0; ch < s->channels; ch++)
s->fast_gain_code[ch] = 4;
diff --git a/tests/ref/acodec/ac3 b/tests/ref/acodec/ac3
index 3a673fc..3ca8219 100644
--- a/tests/ref/acodec/ac3
+++ b/tests/ref/acodec/ac3
@@ -1,2 +1,2 @@
-8ea1ce311247d27dc653f274ed7104cd *./tests/data/acodec/ac3.rm
+b315176b519a63a35cb91566e768f62b *./tests/data/acodec/ac3.rm
98751 ./tests/data/acodec/ac3.rm
diff --git a/tests/ref/lavf/rm b/tests/ref/lavf/rm
index bdb16e8..d9ec51e 100644
--- a/tests/ref/lavf/rm
+++ b/tests/ref/lavf/rm
@@ -1,2 +1,2 @@
-03427369521c9ebc2a5408a0e2a163bf *./tests/data/lavf/lavf.rm
+e1990def7b195a568340f2c1a89d6587 *./tests/data/lavf/lavf.rm
346706 ./tests/data/lavf/lavf.rm
diff --git a/tests/ref/seek/ac3_rm b/tests/ref/seek/ac3_rm
index 86a0f75..6d47c47 100644
--- a/tests/ref/seek/ac3_rm
+++ b/tests/ref/seek/ac3_rm
@@ -1,43 +1,42 @@
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret: 0 st:-1 flags:0 ts:-1.000000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
-ret: 0 st:-1 flags:1 ts: 1.894167
-ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
+ret:-1 st:-1 flags:1 ts: 1.894167
ret:-1 st: 0 flags:0 ts: 0.788000
ret: 0 st: 0 flags:1 ts:-0.317000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret: 0 st:-1 flags:0 ts: 2.576668
-ret: 0 st: 0 flags:1 dts: 2.960000 pts: 2.960000 pos: 48659 size: 558
+ret: 0 st: 0 flags:1 dts: 4.179000 pts: 4.179000 pos: 68585 size: 556
ret:-1 st:-1 flags:1 ts: 1.470835
-ret:-1 st: 0 flags:0 ts: 0.365000
+ret: 0 st: 0 flags:0 ts: 0.365000
+ret: 0 st: 0 flags:1 dts: 0.383000 pts: 0.383000 pos: 6533 size: 558
ret: 0 st: 0 flags:1 ts:-0.741000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
-ret: 0 st:-1 flags:0 ts: 2.153336
-ret: 0 st: 0 flags:1 dts: 2.960000 pts: 2.960000 pos: 48659 size: 558
+ret:-1 st:-1 flags:0 ts: 2.153336
ret:-1 st:-1 flags:1 ts: 1.047503
ret: 0 st: 0 flags:0 ts:-0.058000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
-ret: 0 st: 0 flags:1 ts: 2.836000
-ret: 0 st: 0 flags:1 dts: 2.333000 pts: 2.333000 pos: 38413 size: 556
+ret:-1 st: 0 flags:1 ts: 2.836000
ret:-1 st:-1 flags:0 ts: 1.730004
ret: 0 st:-1 flags:1 ts: 0.624171
-ret: 0 st: 0 flags:1 dts: 0.417000 pts: 0.417000 pos: 7103 size: 556
+ret: 0 st: 0 flags:1 dts: 0.452000 pts: 0.452000 pos: 7671 size: 558
ret: 0 st: 0 flags:0 ts:-0.482000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
-ret:-1 st: 0 flags:1 ts: 2.413000
+ret: 0 st: 0 flags:1 ts: 2.413000
+ret: 0 st: 0 flags:1 dts: 2.333000 pts: 2.333000 pos: 38413 size: 556
ret:-1 st:-1 flags:0 ts: 1.306672
-ret: 0 st:-1 flags:1 ts: 0.200839
-ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
+ret:-1 st:-1 flags:1 ts: 0.200839
ret: 0 st: 0 flags:0 ts:-0.905000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
ret: 0 st: 0 flags:1 ts: 1.989000
-ret: 0 st: 0 flags:1 dts: 1.950000 pts: 1.950000 pos: 32151 size: 556
-ret: 0 st:-1 flags:0 ts: 0.883340
-ret: 0 st: 0 flags:1 dts: 2.159000 pts: 2.159000 pos: 35567 size: 556
+ret: 0 st: 0 flags:1 dts: 1.985000 pts: 1.985000 pos: 32719 size: 558
+ret:-1 st:-1 flags:0 ts: 0.883340
ret: 0 st:-1 flags:1 ts:-0.222493
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
-ret:-1 st: 0 flags:0 ts: 2.672000
+ret: 0 st: 0 flags:0 ts: 2.672000
+ret: 0 st: 0 flags:1 dts: 4.179000 pts: 4.179000 pos: 68585 size: 556
ret:-1 st: 0 flags:1 ts: 1.566000
-ret:-1 st:-1 flags:0 ts: 0.460008
+ret: 0 st:-1 flags:0 ts: 0.460008
+ret: 0 st: 0 flags:1 dts: 4.179000 pts: 4.179000 pos: 68585 size: 556
ret: 0 st:-1 flags:1 ts:-0.645825
ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 271 size: 556
--
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