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- Log -----------------------------------------------------------------
commit 23fbd7867da103378f7c3fd435551c8bc06ce029
Author: Marcelo Povoa <marspeoples...@gmail.com>
Date: Thu Jul 15 12:17:41 2010 -0300
Write pitch enhancer filter, remove const qualifier from
synth_fixed_vector due to multiple processing
diff --git a/libavcodec/amrwbdec.c b/libavcodec/amrwbdec.c
index 7b02188..57965d3 100644
--- a/libavcodec/amrwbdec.c
+++ b/libavcodec/amrwbdec.c
@@ -714,8 +714,8 @@ static float voice_factor(float *p_vector, float p_gain,
* @param fixed_vector [in] unfiltered fixed vector
* @param out [in] space for modified vector if necessary
*/
-static const float *anti_sparseness(AMRWBContext *ctx,
- const float *fixed_vector, float *out)
+static float *anti_sparseness(AMRWBContext *ctx,
+ float *fixed_vector, float *out)
{
int ir_filter_nr;
@@ -833,6 +833,30 @@ static float noise_enhancer(float fixed_gain, float
*prev_tr_gain,
}
/**
+ * Filter the fixed_vector to emphasize the higher frequencies
+ *
+ * @param fixed_vector [in/out] fixed codebook vector
+ * @param voice_fac [in] frame voicing factor
+ */
+static void pitch_enhancer(float *fixed_vector, float voice_fac)
+{
+ int i;
+ float cpe = 0.125 * (1 + voice_fac);
+ float last = fixed_vector[0]; // holds c(i - 1)
+
+ fixed_vector[0] -= cpe * fixed_vector[1];
+
+ for (i = 1; i < AMRWB_SUBFRAME_SIZE - 1; i++) {
+ float cur = fixed_vector[i];
+
+ fixed_vector[i] -= cpe * (last + fixed_vector[i + 1]);
+ last = cur;
+ }
+
+ fixed_vector[AMRWB_SUBFRAME_SIZE - 1] -= cpe * last;
+}
+
+/**
* Update context state before the next subframe
*/
static void update_sub_state(AMRWBContext *ctx)
@@ -851,7 +875,7 @@ static int amrwb_decode_frame(AVCodecContext *avctx, void
*data, int *data_size,
AMRFixed fixed_sparse = {0}; // fixed vector up to
anti-sparseness processing
float spare_vector[AMRWB_SUBFRAME_SIZE]; // extra stack space to hold
result from anti-sparseness processing
float fixed_gain_factor; // fixed gain correction factor
(gamma)
- const float *synth_fixed_vector; // pointer to the fixed vector
that synthesis should use
+ float *synth_fixed_vector; // pointer to the fixed vector
that synthesis should use
float synth_fixed_gain; // the fixed gain that synthesis
should use
float voice_fac, stab_fac; // parameters used for gain
smoothing
int sub, i;
@@ -922,12 +946,17 @@ static int amrwb_decode_frame(AVCodecContext *avctx, void
*data, int *data_size,
// I did not found a reference of this in the ref decoder
}
+ /* Post-processing of excitation elements */
synth_fixed_gain = noise_enhancer(ctx->fixed_gain[4],
&ctx->prev_tr_gain,
voice_fac, stab_fac);
synth_fixed_vector = anti_sparseness(ctx, ctx->fixed_vector,
spare_vector);
+ pitch_enhancer(synth_fixed_vector, voice_fac);
+
+
+ /* Update buffers and history */
ff_clear_fixed_vector(ctx->fixed_vector, &fixed_sparse,
AMRWB_SUBFRAME_SIZE);
update_sub_state(ctx);
-----------------------------------------------------------------------
Summary of changes:
libavcodec/amrwbdec.c | 35 ++++++++++++++++++++++++++++++++---
1 files changed, 32 insertions(+), 3 deletions(-)
hooks/post-receive
--
AMR-WB decoder
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