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Stefan Westerfeld
audiowmark
Commits
ee3a111e
Commit
ee3a111e
authored
Jan 10, 2019
by
Stefan Westerfeld
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Precompute db-magnitudes to make sync search faster.
Signed-off-by:
Stefan Westerfeld
<
stefan@space.twc.de
>
parent
426a4064
Changes
1
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22 additions
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19 deletions
+22
-19
audiowmark.cc
src/audiowmark.cc
+22
-19
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src/audiowmark.cc
View file @
ee3a111e
...
...
@@ -818,7 +818,7 @@ public:
get_up_down
(
i
,
up
[
i
],
down
[
i
]);
}
double
sync_decode
(
const
WavData
&
wav_data
,
const
size_t
start_frame
,
const
vector
<
vector
<
complex
<
float
>>>&
fft_out
,
const
vector
<
vector
<
complex
<
float
>>>&
fft_orig_out
)
sync_decode
(
const
WavData
&
wav_data
,
const
size_t
start_frame
,
const
vector
<
vector
<
float
>>&
fft_out_db
)
{
// FIXME: is copypasted
const
int
frame_count
=
mark_sync_frame_count
();
...
...
@@ -832,21 +832,11 @@ public:
{
const
size_t
index
=
(
f
+
start_frame
)
*
wav_data
.
n_channels
()
+
ch
;
const
double
min_db
=
-
96
;
for
(
auto
u
:
up
[
f
])
{
umag
+=
db_from_factor
(
abs
(
fft_out
[
index
][
u
]),
min_db
);
umag
+=
fft_out_db
[
index
][
u
];
if
(
index
<
fft_orig_out
.
size
())
umag
-=
db_from_factor
(
abs
(
fft_orig_out
[
index
][
u
]),
min_db
);
}
for
(
auto
d
:
down
[
f
])
{
dmag
+=
db_from_factor
(
abs
(
fft_out
[
index
][
d
]),
min_db
);
if
(
index
<
fft_orig_out
.
size
())
dmag
-=
db_from_factor
(
abs
(
fft_orig_out
[
index
][
d
]),
min_db
);
}
dmag
+=
fft_out_db
[
index
][
d
];
}
if
((
f
%
Params
::
sync_frames_per_bit
)
==
(
Params
::
sync_frames_per_bit
-
1
))
{
...
...
@@ -875,7 +865,7 @@ public:
vector
<
SyncScore
>
sync_scores
;
// compute multiple time-shifted fft vectors
vector
<
vector
<
vector
<
complex
<
float
>
>>>
fft_sync_shift_out
;
vector
<
vector
<
vector
<
float
>>>
fft_sync_shift_out
;
for
(
size_t
sync_shift
=
0
;
sync_shift
<
Params
::
frame_size
;
sync_shift
+=
128
)
fft_sync_shift_out
.
push_back
(
sync_fft
(
wav_data
,
sync_shift
,
frame_count
(
wav_data
)
-
1
));
...
...
@@ -886,7 +876,7 @@ public:
const
size_t
sync_index
=
start_frame
*
Params
::
frame_size
+
sync_shift
;
if
((
start_frame
+
mark_sync_frame_count
())
*
wav_data
.
n_channels
()
<
fft_sync_shift_out
[
sync_shift
/
128
].
size
())
{
double
quality
=
sync_decode
(
wav_data
,
start_frame
,
fft_sync_shift_out
[
sync_shift
/
128
]
,
/* FIXME: non-blind */
{}
);
double
quality
=
sync_decode
(
wav_data
,
start_frame
,
fft_sync_shift_out
[
sync_shift
/
128
]);
// printf ("%zd %f\n", sync_index, quality);
sync_scores
.
emplace_back
(
SyncScore
{
sync_index
,
quality
});
}
...
...
@@ -919,10 +909,10 @@ public:
int
step
=
8
;
for
(
int
fine_index
=
start
;
fine_index
<
end
;
fine_index
+=
step
)
{
vector
<
vector
<
complex
<
float
>
>>
fft_out_range
=
sync_fft
(
wav_data
,
fine_index
,
mark_sync_frame_count
());
vector
<
vector
<
float
>>
fft_out_range
=
sync_fft
(
wav_data
,
fine_index
,
mark_sync_frame_count
());
if
(
fft_out_range
.
size
())
{
double
q
=
sync_decode
(
wav_data
,
0
,
fft_out_range
,
{}
);
double
q
=
sync_decode
(
wav_data
,
0
,
fft_out_range
);
if
(
q
>
best_quality
)
{
...
...
@@ -936,7 +926,7 @@ public:
}
}
}
vector
<
vector
<
complex
<
float
>
>>
vector
<
vector
<
float
>>
sync_fft
(
const
WavData
&
wav_data
,
size_t
index
,
size_t
count
)
{
if
(
wav_data
.
n_values
()
<
(
index
+
count
*
Params
::
frame_size
)
*
wav_data
.
n_channels
())
...
...
@@ -949,7 +939,20 @@ public:
part_signal
.
push_back
(
wav_data
.
samples
()[(
index
+
i
)
*
wav_data
.
n_channels
()
+
ch
]);
}
WavData
wav_part
(
part_signal
,
wav_data
.
n_channels
(),
wav_data
.
mix_freq
(),
wav_data
.
bit_depth
());
return
compute_frame_ffts
(
wav_part
);
/* computing db-magnitude is expensive, so we better do it here */
vector
<
vector
<
float
>>
fft_out_db
;
for
(
auto
spect
:
compute_frame_ffts
(
wav_part
))
{
const
double
min_db
=
-
96
;
vector
<
float
>
db_spect
(
spect
.
size
());
for
(
size_t
i
=
Params
::
min_band
;
i
<=
Params
::
max_band
;
i
++
)
db_spect
[
i
]
=
db_from_factor
(
abs
(
spect
[
i
]),
min_db
);
fft_out_db
.
push_back
(
db_spect
);
}
return
fft_out_db
;
}
const
char
*
...
...
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