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-rw-r--r--libFDK/include/qmf_pcm.h218
1 files changed, 217 insertions, 1 deletions
diff --git a/libFDK/include/qmf_pcm.h b/libFDK/include/qmf_pcm.h
index f24e0cd..5da53db 100644
--- a/libFDK/include/qmf_pcm.h
+++ b/libFDK/include/qmf_pcm.h
@@ -1,7 +1,7 @@
/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
-© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.
1. INTRODUCTION
@@ -402,4 +402,220 @@ void qmfSynthesisFiltering(
timeOut + (i * L * stride), stride, pWorkBuffer);
} /* no_col loop i */
}
+
+/*!
+ *
+ * \brief Create QMF filter bank instance
+ *
+ *
+ * \return 0 if successful
+ *
+ */
+int qmfInitAnalysisFilterBank(
+ HANDLE_QMF_FILTER_BANK h_Qmf, /*!< Returns handle */
+ FIXP_QAS *pFilterStates, /*!< Handle to filter states */
+ int noCols, /*!< Number of timeslots per frame */
+ int lsb, /*!< lower end of QMF */
+ int usb, /*!< upper end of QMF */
+ int no_channels, /*!< Number of channels (bands) */
+ int flags) /*!< Low Power flag */
+{
+ int err = qmfInitFilterBank(h_Qmf, pFilterStates, noCols, lsb, usb,
+ no_channels, flags, 0);
+ if (!(flags & QMF_FLAG_KEEP_STATES) && (h_Qmf->FilterStates != NULL)) {
+ FDKmemclear(h_Qmf->FilterStates,
+ (2 * QMF_NO_POLY - 1) * h_Qmf->no_channels * sizeof(FIXP_QAS));
+ }
+
+ FDK_ASSERT(h_Qmf->no_channels >= h_Qmf->lsb);
+
+ return err;
+}
+
+#ifndef FUNCTION_qmfAnaPrototypeFirSlot
+/*!
+ \brief Perform Analysis Prototype Filtering on a single slot of input data.
+*/
+static void qmfAnaPrototypeFirSlot(
+ FIXP_DBL *analysisBuffer,
+ INT no_channels, /*!< Number channels of analysis filter */
+ const FIXP_PFT *p_filter, INT p_stride, /*!< Stride of analysis filter */
+ FIXP_QAS *RESTRICT pFilterStates) {
+ INT k;
+
+ FIXP_DBL accu;
+ const FIXP_PFT *RESTRICT p_flt = p_filter;
+ FIXP_DBL *RESTRICT pData_0 = analysisBuffer + 2 * no_channels - 1;
+ FIXP_DBL *RESTRICT pData_1 = analysisBuffer;
+
+ FIXP_QAS *RESTRICT sta_0 = (FIXP_QAS *)pFilterStates;
+ FIXP_QAS *RESTRICT sta_1 =
+ (FIXP_QAS *)pFilterStates + (2 * QMF_NO_POLY * no_channels) - 1;
+ INT pfltStep = QMF_NO_POLY * (p_stride);
+ INT staStep1 = no_channels << 1;
+ INT staStep2 = (no_channels << 3) - 1; /* Rewind one less */
+
+ /* FIR filters 127..64 0..63 */
+ for (k = 0; k < no_channels; k++) {
+ accu = fMultDiv2(p_flt[0], *sta_1);
+ sta_1 -= staStep1;
+ accu += fMultDiv2(p_flt[1], *sta_1);
+ sta_1 -= staStep1;
+ accu += fMultDiv2(p_flt[2], *sta_1);
+ sta_1 -= staStep1;
+ accu += fMultDiv2(p_flt[3], *sta_1);
+ sta_1 -= staStep1;
+ accu += fMultDiv2(p_flt[4], *sta_1);
+ *pData_1++ = (accu << 1);
+ sta_1 += staStep2;
+
+ p_flt += pfltStep;
+ accu = fMultDiv2(p_flt[0], *sta_0);
+ sta_0 += staStep1;
+ accu += fMultDiv2(p_flt[1], *sta_0);
+ sta_0 += staStep1;
+ accu += fMultDiv2(p_flt[2], *sta_0);
+ sta_0 += staStep1;
+ accu += fMultDiv2(p_flt[3], *sta_0);
+ sta_0 += staStep1;
+ accu += fMultDiv2(p_flt[4], *sta_0);
+ *pData_0-- = (accu << 1);
+ sta_0 -= staStep2;
+ }
+}
+#endif /* !defined(FUNCTION_qmfAnaPrototypeFirSlot) */
+
+#ifndef FUNCTION_qmfAnaPrototypeFirSlot_NonSymmetric
+/*!
+ \brief Perform Analysis Prototype Filtering on a single slot of input data.
+*/
+static void qmfAnaPrototypeFirSlot_NonSymmetric(
+ FIXP_DBL *analysisBuffer,
+ int no_channels, /*!< Number channels of analysis filter */
+ const FIXP_PFT *p_filter, int p_stride, /*!< Stride of analysis filter */
+ FIXP_QAS *RESTRICT pFilterStates) {
+ const FIXP_PFT *RESTRICT p_flt = p_filter;
+ int p, k;
+
+ for (k = 0; k < 2 * no_channels; k++) {
+ FIXP_DBL accu = (FIXP_DBL)0;
+
+ p_flt += QMF_NO_POLY * (p_stride - 1);
+
+ /*
+ Perform FIR-Filter
+ */
+ for (p = 0; p < QMF_NO_POLY; p++) {
+ accu += fMultDiv2(*p_flt++, pFilterStates[2 * no_channels * p]);
+ }
+ analysisBuffer[2 * no_channels - 1 - k] = (accu << 1);
+ pFilterStates++;
+ }
+}
+#endif /* FUNCTION_qmfAnaPrototypeFirSlot_NonSymmetric */
+
+/*
+ * \brief Perform one QMF slot analysis of the time domain data of timeIn
+ * with specified stride and stores the real part of the subband
+ * samples in rSubband, and the imaginary part in iSubband
+ *
+ * Note: anaQmf->lsb can be greater than anaQmf->no_channels in case
+ * of implicit resampling (USAC with reduced 3/4 core frame length).
+ */
+void qmfAnalysisFilteringSlot(
+ HANDLE_QMF_FILTER_BANK anaQmf, /*!< Handle of Qmf Synthesis Bank */
+ FIXP_DBL *qmfReal, /*!< Low and High band, real */
+ FIXP_DBL *qmfImag, /*!< Low and High band, imag */
+ const INT_PCM_QMFIN *RESTRICT timeIn, /*!< Pointer to input */
+ const int stride, /*!< stride factor of input */
+ FIXP_DBL *pWorkBuffer /*!< pointer to temporal working buffer */
+) {
+ int offset = anaQmf->no_channels * (QMF_NO_POLY * 2 - 1);
+ /*
+ Feed time signal into oldest anaQmf->no_channels states
+ */
+ {
+ FIXP_QAS *FilterStatesAnaTmp = ((FIXP_QAS *)anaQmf->FilterStates) + offset;
+
+ /* Feed and scale actual time in slot */
+ for (int i = anaQmf->no_channels >> 1; i != 0; i--) {
+ /* Place INT_PCM value left aligned in scaledTimeIn */
+ *FilterStatesAnaTmp++ = (FIXP_QAS)*timeIn;
+ timeIn += stride;
+ *FilterStatesAnaTmp++ = (FIXP_QAS)*timeIn;
+ timeIn += stride;
+ }
+ }
+
+ if (anaQmf->flags & QMF_FLAG_NONSYMMETRIC) {
+ qmfAnaPrototypeFirSlot_NonSymmetric(pWorkBuffer, anaQmf->no_channels,
+ anaQmf->p_filter, anaQmf->p_stride,
+ (FIXP_QAS *)anaQmf->FilterStates);
+ } else {
+ qmfAnaPrototypeFirSlot(pWorkBuffer, anaQmf->no_channels, anaQmf->p_filter,
+ anaQmf->p_stride, (FIXP_QAS *)anaQmf->FilterStates);
+ }
+
+ if (anaQmf->flags & QMF_FLAG_LP) {
+ if (anaQmf->flags & QMF_FLAG_CLDFB)
+ qmfForwardModulationLP_odd(anaQmf, pWorkBuffer, qmfReal);
+ else
+ qmfForwardModulationLP_even(anaQmf, pWorkBuffer, qmfReal);
+
+ } else {
+ qmfForwardModulationHQ(anaQmf, pWorkBuffer, qmfReal, qmfImag);
+ }
+ /*
+ Shift filter states
+
+ Should be realized with modulo addressing on a DSP instead of a true buffer
+ shift
+ */
+ FDKmemmove(anaQmf->FilterStates,
+ (FIXP_QAS *)anaQmf->FilterStates + anaQmf->no_channels,
+ offset * sizeof(FIXP_QAS));
+}
+
+/*!
+ *
+ * \brief Perform complex-valued subband filtering of the time domain
+ * data of timeIn and stores the real part of the subband
+ * samples in rAnalysis, and the imaginary part in iAnalysis
+ * The qmf coefficient table is symmetric. The symmetry is expoited by
+ * shrinking the coefficient table to half the size. The addressing mode
+ * takes care of the symmetries.
+ *
+ *
+ * \sa PolyphaseFiltering
+ */
+void qmfAnalysisFiltering(
+ HANDLE_QMF_FILTER_BANK anaQmf, /*!< Handle of Qmf Analysis Bank */
+ FIXP_DBL **qmfReal, /*!< Pointer to real subband slots */
+ FIXP_DBL **qmfImag, /*!< Pointer to imag subband slots */
+ QMF_SCALE_FACTOR *scaleFactor,
+ const INT_PCM_QMFIN *timeIn, /*!< Time signal */
+ const int timeIn_e, const int stride,
+ FIXP_DBL *pWorkBuffer /*!< pointer to temporal working buffer */
+) {
+ int i;
+ int no_channels = anaQmf->no_channels;
+
+ scaleFactor->lb_scale =
+ -ALGORITHMIC_SCALING_IN_ANALYSIS_FILTERBANK - timeIn_e;
+ scaleFactor->lb_scale -= anaQmf->filterScale;
+
+ for (i = 0; i < anaQmf->no_col; i++) {
+ FIXP_DBL *qmfImagSlot = NULL;
+
+ if (!(anaQmf->flags & QMF_FLAG_LP)) {
+ qmfImagSlot = qmfImag[i];
+ }
+
+ qmfAnalysisFilteringSlot(anaQmf, qmfReal[i], qmfImagSlot, timeIn, stride,
+ pWorkBuffer);
+
+ timeIn += no_channels * stride;
+
+ } /* no_col loop i */
+}
#endif /* QMF_PCM_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 06:36:14 +0000