48e6f2051d
Add audio sample rate conversion library from http://www.mega-nerd.com/SRC/index.html Source: https://github.com/libsndfile/libsamplerate Add needed patches for NuttX OS and embedded boards. NOTE: We must use master branch until next stable release
83 lines
2.8 KiB
Diff
83 lines
2.8 KiB
Diff
From 8d709a69b23efc52030824ae21db889589467d8c Mon Sep 17 00:00:00 2001
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From: Alin Jerpelea <alin.jerpelea@sony.com>
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Date: Mon, 16 Nov 2020 09:44:17 +0100
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Subject: [PATCH] add audio quality options
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Many NuttX boards have limited rerources and will have to use
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compile time quality options to reduce resource usage
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Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
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---
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src/src_sinc.c | 30 +++++++++++++++++++++++++-----
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1 files changed, 25 insertions(+), 5 deletions(-)
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diff --git a/src/src_sinc.c b/src/src_sinc.c
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index 0a22708..b81326e 100644
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--- a/src/src_sinc.c
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+++ b/src/src_sinc.c
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@@ -40,9 +40,17 @@ typedef int32_t increment_t ;
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typedef float coeff_t ;
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typedef int _CHECK_SHIFT_BITS[2 * (SHIFT_BITS < sizeof (increment_t) * 8 - 1) - 1]; /* sanity check. */
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-#include "fastest_coeffs.h"
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-#include "mid_qual_coeffs.h"
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-#include "high_qual_coeffs.h"
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+#if CONFIG_AUDIO_SRC_QUALITY == 2
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+ #include "fastest_coeffs.h"
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+#elif CONFIG_AUDIO_SRC_QUALITY == 1
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+ #include "mid_qual_coeffs.h"
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+#elif if CONFIG_AUDIO_SRC_QUALITY == 0
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+ #include "high_qual_coeffs.h"
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+#else
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+ #include "fastest_coeffs.h"
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+ #include "mid_qual_coeffs.h"
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+ #include "high_qual_coeffs.h"
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+#endif
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typedef struct
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{ int sinc_magic_marker ;
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@@ -206,6 +214,19 @@ sinc_filter_new (int converter_type, int channels)
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if (priv)
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{
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priv->sinc_magic_marker = SINC_MAGIC_MARKER ;
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+#if CONFIG_AUDIO_SRC_QUALITY == 2
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+ priv->coeffs = fastest_coeffs.coeffs ;
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+ priv->coeff_half_len = ARRAY_LEN (fastest_coeffs.coeffs) - 2 ;
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+ priv->index_inc = fastest_coeffs.increment ;
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+#elif CONFIG_AUDIO_SRC_QUALITY == 1
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+ priv->coeffs = slow_mid_qual_coeffs.coeffs ;
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+ priv->coeff_half_len = ARRAY_LEN (slow_mid_qual_coeffs.coeffs) - 2 ;
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+ priv->index_inc = slow_mid_qual_coeffs.increment ;
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+#elif CONFIG_AUDIO_SRC_QUALITY == 0
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+ priv->coeffs = slow_high_qual_coeffs.coeffs ;
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+ priv->coeff_half_len = ARRAY_LEN (slow_high_qual_coeffs.coeffs) - 2 ;
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+ priv->index_inc = slow_high_qual_coeffs.increment ;
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+#else
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switch (converter_type)
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{
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case SRC_SINC_FASTEST :
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@@ -213,19 +234,18 @@ sinc_filter_new (int converter_type, int channels)
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priv->coeff_half_len = ARRAY_LEN (fastest_coeffs.coeffs) - 2 ;
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priv->index_inc = fastest_coeffs.increment ;
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break ;
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-
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case SRC_SINC_MEDIUM_QUALITY :
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priv->coeffs = slow_mid_qual_coeffs.coeffs ;
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priv->coeff_half_len = ARRAY_LEN (slow_mid_qual_coeffs.coeffs) - 2 ;
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priv->index_inc = slow_mid_qual_coeffs.increment ;
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break ;
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-
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case SRC_SINC_BEST_QUALITY :
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priv->coeffs = slow_high_qual_coeffs.coeffs ;
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priv->coeff_half_len = ARRAY_LEN (slow_high_qual_coeffs.coeffs) - 2 ;
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priv->index_inc = slow_high_qual_coeffs.increment ;
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break ;
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}
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+#endif
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priv->b_len = 3 * (int) lrint ((priv->coeff_half_len + 2.0) / priv->index_inc * SRC_MAX_RATIO + 1) ;
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priv->b_len = MAX (priv->b_len, 4096) ;
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--
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2.17.1
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