[FFmpeg-soc] [soc]AMR-WB decoder branch, master, updated.
Marcelo Póvoa
marspeoplester at gmail.com
Wed Jul 28 05:35:11 CEST 2010
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- Log -----------------------------------------------------------------
commit 5116d7f3e4f7d3dfb7436506d9d9771e3c0cf2a4
Author: Marcelo Povoa <marspeoplester at gmail.com>
Date: Wed Jul 28 00:34:59 2010 -0300
Fix LP coefficients offset and upscale output, bringing
the decoder output audio to a recognizable level for some
bitrates (contains only the lower frequency band yet)
diff --git a/libavcodec/amrwbdec.c b/libavcodec/amrwbdec.c
index 3f3faf4..35f74af 100644
--- a/libavcodec/amrwbdec.c
+++ b/libavcodec/amrwbdec.c
@@ -51,7 +51,7 @@ typedef struct {
double isp[4][LP_ORDER]; ///< ISP vectors from current frame
double isp_sub4_past[LP_ORDER]; ///< ISP vector for the 4th subframe of the previous frame
- float lp_coef[4][LP_ORDER]; ///< Linear Prediction Coefficients from ISP vector
+ float lp_coef[4][LP_ORDER + 1]; ///< Linear Prediction Coefficients from ISP vector
uint8_t base_pitch_lag; ///< integer part of pitch lag for next relative subframe
uint8_t pitch_lag_int; ///< integer part of pitch lag of the previous subframe
@@ -905,7 +905,7 @@ static void synthesis(AMRWBContext *ctx, float *lpc, float *excitation,
energy, AMRWB_SUBFRAME_SIZE);
}
- ff_celp_lp_synthesis_filterf(samples, lpc, excitation,
+ ff_celp_lp_synthesis_filterf(samples, lpc + 1, excitation,
AMRWB_SUBFRAME_SIZE, LP_ORDER);
}
@@ -985,7 +985,7 @@ static void upsample_5_4(float *out, const float *in, int o_size)
out[i] = ff_dot_productf(in0 + int_part, upsample_fir[4 - frac_part],
UPS_MEM_SIZE);
- out[i] *= 2.0; // upscale output
+ out[i] *= 2.0 / 32768.0; // upscale output
}
}
-----------------------------------------------------------------------
Summary of changes:
libavcodec/amrwbdec.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
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AMR-WB decoder
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