— Update ffmpeg

— Refactor ffmpeg usage to modern APIs
— Update media encoding and decoding

submodules/ffmpeg/Sources/FFMpeg/ffmpeg-7.1/libavcodec/ac3dsp.h

@@ -0,0 +1,123 @@
+/*
+ * AC-3 DSP functions
+ * Copyright (c) 2011 Justin Ruggles
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_AC3DSP_H
+#define AVCODEC_AC3DSP_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * Number of mantissa bits written for each bap value.
+ * bap values with fractional bits are set to 0 and are calculated separately.
+ */
+extern const uint16_t ff_ac3_bap_bits[16];
+
+typedef struct AC3DSPContext {
+    /**
+     * Set each encoded exponent in a block to the minimum of itself and the
+     * exponents in the same frequency bin of up to 5 following blocks.
+     * @param exp   pointer to the start of the current block of exponents.
+     *              constraints: align 16
+     * @param num_reuse_blocks  number of blocks that will reuse exponents from the current block.
+     *                          constraints: range 0 to 5
+     * @param nb_coefs  number of frequency coefficients.
+     */
+    void (*ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
+
+    /**
+     * Convert an array of float in range [-1.0,1.0] to int32_t with range
+     * [-(1<<24),(1<<24)]
+     *
+     * @param dst destination array of int32_t.
+     *            constraints: 32-byte aligned
+     * @param src source array of float.
+     *            constraints: 32-byte aligned
+     * @param len number of elements to convert.
+     *            constraints: multiple of 32 greater than zero
+     */
+    void (*float_to_fixed24)(int32_t *dst, const float *src, size_t len);
+
+    /**
+     * Calculate bit allocation pointers.
+     * The SNR is the difference between the masking curve and the signal.  AC-3
+     * uses this value for each frequency bin to allocate bits.  The snroffset
+     * parameter is a global adjustment to the SNR for all bins.
+     *
+     * @param[in]  mask       masking curve
+     * @param[in]  psd        signal power for each frequency bin
+     * @param[in]  start      starting bin location
+     * @param[in]  end        ending bin location
+     * @param[in]  snr_offset SNR adjustment
+     * @param[in]  floor      noise floor
+     * @param[in]  bap_tab    look-up table for bit allocation pointers
+     * @param[out] bap        bit allocation pointers
+     */
+    void (*bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end,
+                               int snr_offset, int floor,
+                               const uint8_t *bap_tab, uint8_t *bap);
+
+    /**
+     * Update bap counts using the supplied array of bap.
+     *
+     * @param[out] mant_cnt   bap counts for 1 block
+     * @param[in]  bap        array of bap, pointing to start coef bin
+     * @param[in]  len        number of elements to process
+     */
+    void (*update_bap_counts)(uint16_t mant_cnt[16], uint8_t *bap, int len);
+
+    /**
+     * Calculate the number of bits needed to encode a set of mantissas.
+     *
+     * @param[in] mant_cnt    bap counts for all blocks
+     * @return                mantissa bit count
+     */
+    int (*compute_mantissa_size)(uint16_t mant_cnt[6][16]);
+
+    void (*extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs);
+
+    void (*sum_square_butterfly_int32)(int64_t sum[4], const int32_t *coef0,
+                                       const int32_t *coef1, int len);
+
+    void (*sum_square_butterfly_float)(float sum[4], const float *coef0,
+                                       const float *coef1, int len);
+
+    int out_channels;
+    int in_channels;
+    void (*downmix)(float **samples, float **matrix, int len);
+    void (*downmix_fixed)(int32_t **samples, int16_t **matrix, int len);
+} AC3DSPContext;
+
+void ff_ac3dsp_init(AC3DSPContext *c);
+void ff_ac3dsp_init_aarch64(AC3DSPContext *c);
+void ff_ac3dsp_init_arm(AC3DSPContext *c);
+void ff_ac3dsp_init_x86(AC3DSPContext *c);
+void ff_ac3dsp_init_mips(AC3DSPContext *c);
+void ff_ac3dsp_init_riscv(AC3DSPContext *c);
+
+void ff_ac3dsp_downmix(AC3DSPContext *c, float **samples, float **matrix,
+                       int out_ch, int in_ch, int len);
+void ff_ac3dsp_downmix_fixed(AC3DSPContext *c, int32_t **samples, int16_t **matrix,
+                             int out_ch, int in_ch, int len);
+
+void ff_ac3dsp_set_downmix_x86(AC3DSPContext *c);
+
+#endif /* AVCODEC_AC3DSP_H */