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audio-channel-mixer: round before truncating

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Round the result before truncating for int channel mixing.
This commit is contained in:
Wim Taymans 2016-01-12 15:56:36 +01:00
parent ef3844cf6f
commit 1b412a523d
1 changed files with 4 additions and 4 deletions
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8
gst-libs/gst/audio/audio-channel-mixer.c
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@ -52,7 +52,7 @@ ensure_debug_category (void)
#endif /* GST_DISABLE_GST_DEBUG */ #endif /* GST_DISABLE_GST_DEBUG */
#define INT_MATRIX_FACTOR_EXPONENT 10 #define PRECISION_INT 10
typedef void (*MixerFunc) (GstAudioChannelMixer * mix, const gpointer src, typedef void (*MixerFunc) (GstAudioChannelMixer * mix, const gpointer src,
gpointer dst, gint samples); gpointer dst, gint samples);
@ -650,7 +650,7 @@ gst_audio_channel_mixer_setup_matrix_int (GstAudioChannelMixer * mix)
{ {
gint i, j; gint i, j;
gfloat tmp; gfloat tmp;
gfloat factor = (1 << INT_MATRIX_FACTOR_EXPONENT); gfloat factor = (1 << PRECISION_INT);
mix->matrix_int = g_new0 (gint *, mix->in_channels); mix->matrix_int = g_new0 (gint *, mix->in_channels);
@ -729,7 +729,7 @@ gst_audio_channel_mixer_mix_int16 (GstAudioChannelMixer * mix,
res += in_data[n * inchannels + in] * mix->matrix_int[in][out]; res += in_data[n * inchannels + in] * mix->matrix_int[in][out];
/* remove factor from int matrix */ /* remove factor from int matrix */
res = res >> INT_MATRIX_FACTOR_EXPONENT; res = (res + (1 << (PRECISION_INT - 1))) >> PRECISION_INT;
out_data[n * outchannels + out] = CLAMP (res, G_MININT16, G_MAXINT16); out_data[n * outchannels + out] = CLAMP (res, G_MININT16, G_MAXINT16);
} }
} }
@ -754,7 +754,7 @@ gst_audio_channel_mixer_mix_int32 (GstAudioChannelMixer * mix,
res += in_data[n * inchannels + in] * (gint64) mix->matrix_int[in][out]; res += in_data[n * inchannels + in] * (gint64) mix->matrix_int[in][out];
/* remove factor from int matrix */ /* remove factor from int matrix */
res = res >> INT_MATRIX_FACTOR_EXPONENT; res = (res + (1 << (PRECISION_INT - 1))) >> PRECISION_INT;
out_data[n * outchannels + out] = CLAMP (res, G_MININT32, G_MAXINT32); out_data[n * outchannels + out] = CLAMP (res, G_MININT32, G_MAXINT32);
} }
} }