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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /media/ffvpx/libavcodec/pcm_tablegen.h
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'media/ffvpx/libavcodec/pcm_tablegen.h')
-rw-r--r--media/ffvpx/libavcodec/pcm_tablegen.h143
1 files changed, 143 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/pcm_tablegen.h b/media/ffvpx/libavcodec/pcm_tablegen.h
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+++ b/media/ffvpx/libavcodec/pcm_tablegen.h
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+/*
+ * Header file for hardcoded PCM tables
+ *
+ * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ *
+ * 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_PCM_TABLEGEN_H
+#define AVCODEC_PCM_TABLEGEN_H
+
+#include <stdint.h>
+#include "libavutil/attributes.h"
+
+/* from g711.c by SUN microsystems (unrestricted use) */
+
+#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
+#define QUANT_MASK (0xf) /* Quantization field mask. */
+#define NSEGS (8) /* Number of A-law segments. */
+#define SEG_SHIFT (4) /* Left shift for segment number. */
+#define SEG_MASK (0x70) /* Segment field mask. */
+
+#define BIAS (0x84) /* Bias for linear code. */
+
+#define VIDC_SIGN_BIT (1)
+#define VIDC_QUANT_MASK (0x1E)
+#define VIDC_QUANT_SHIFT (1)
+#define VIDC_SEG_SHIFT (5)
+#define VIDC_SEG_MASK (0xE0)
+
+/* alaw2linear() - Convert an A-law value to 16-bit linear PCM */
+static av_cold int alaw2linear(unsigned char a_val)
+{
+ int t;
+ int seg;
+
+ a_val ^= 0x55;
+
+ t = a_val & QUANT_MASK;
+ seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
+ if(seg) t= (t + t + 1 + 32) << (seg + 2);
+ else t= (t + t + 1 ) << 3;
+
+ return (a_val & SIGN_BIT) ? t : -t;
+}
+
+static av_cold int ulaw2linear(unsigned char u_val)
+{
+ int t;
+
+ /* Complement to obtain normal u-law value. */
+ u_val = ~u_val;
+
+ /*
+ * Extract and bias the quantization bits. Then
+ * shift up by the segment number and subtract out the bias.
+ */
+ t = ((u_val & QUANT_MASK) << 3) + BIAS;
+ t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
+
+ return (u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS);
+}
+
+static av_cold int vidc2linear(unsigned char u_val)
+{
+ int t;
+
+ /*
+ * Extract and bias the quantization bits. Then
+ * shift up by the segment number and subtract out the bias.
+ */
+ t = (((u_val & VIDC_QUANT_MASK) >> VIDC_QUANT_SHIFT) << 3) + BIAS;
+ t <<= ((unsigned)u_val & VIDC_SEG_MASK) >> VIDC_SEG_SHIFT;
+
+ return (u_val & VIDC_SIGN_BIT) ? (BIAS - t) : (t - BIAS);
+}
+
+#if CONFIG_HARDCODED_TABLES
+#define pcm_alaw_tableinit()
+#define pcm_ulaw_tableinit()
+#define pcm_vidc_tableinit()
+#include "libavcodec/pcm_tables.h"
+#else
+/* 16384 entries per table */
+static uint8_t linear_to_alaw[16384];
+static uint8_t linear_to_ulaw[16384];
+static uint8_t linear_to_vidc[16384];
+
+static av_cold void build_xlaw_table(uint8_t *linear_to_xlaw,
+ int (*xlaw2linear)(unsigned char),
+ int mask)
+{
+ int i, j, v, v1, v2;
+
+ j = 1;
+ linear_to_xlaw[8192] = mask;
+ for(i=0;i<127;i++) {
+ v1 = xlaw2linear(i ^ mask);
+ v2 = xlaw2linear((i + 1) ^ mask);
+ v = (v1 + v2 + 4) >> 3;
+ for(;j<v;j+=1) {
+ linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80));
+ linear_to_xlaw[8192 + j] = (i ^ mask);
+ }
+ }
+ for(;j<8192;j++) {
+ linear_to_xlaw[8192 - j] = (127 ^ (mask ^ 0x80));
+ linear_to_xlaw[8192 + j] = (127 ^ mask);
+ }
+ linear_to_xlaw[0] = linear_to_xlaw[1];
+}
+
+static void pcm_alaw_tableinit(void)
+{
+ build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
+}
+
+static void pcm_ulaw_tableinit(void)
+{
+ build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
+}
+
+static void pcm_vidc_tableinit(void)
+{
+ build_xlaw_table(linear_to_vidc, vidc2linear, 0xff);
+}
+#endif /* CONFIG_HARDCODED_TABLES */
+
+#endif /* AVCODEC_PCM_TABLEGEN_H */