Separate format conversion DSP functions from DSPContext.

This will be beneficial for use with the audio conversion API without
requiring it to depend on all of dsputil.

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/libavcodec/fmtconvert.h b/libavcodec/fmtconvert.h
new file mode 100644
index 0000000000..f2ee261f99
--- /dev/null
+++ b/libavcodec/fmtconvert.h
@@ -0,0 +1,79 @@
+/*
+ * Format Conversion Utils
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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_FMTCONVERT_H
+#define AVCODEC_FMTCONVERT_H
+
+#include "avcodec.h"
+
+typedef struct FmtConvertContext {
+    /**
+     * Convert an array of int32_t to float and multiply by a float value.
+     * @param dst destination array of float.
+     *            constraints: 16-byte aligned
+     * @param src source array of int32_t.
+     *            constraints: 16-byte aligned
+     * @param len number of elements to convert.
+     *            constraints: multiple of 8
+     */
+    void (*int32_to_float_fmul_scalar)(float *dst, const int *src, float mul, int len);
+
+    /**
+     * Convert an array of float to an array of int16_t.
+     *
+     * Convert floats from in the range [-32768.0,32767.0] to ints
+     * without rescaling
+     *
+     * @param dst destination array of int16_t.
+     *            constraints: 16-byte aligned
+     * @param src source array of float.
+     *            constraints: 16-byte aligned
+     * @param len number of elements to convert.
+     *            constraints: multiple of 8
+     */
+    void (*float_to_int16)(int16_t *dst, const float *src, long len);
+
+    /**
+     * Convert multiple arrays of float to an interleaved array of int16_t.
+     *
+     * Convert floats from in the range [-32768.0,32767.0] to ints
+     * without rescaling
+     *
+     * @param dst destination array of interleaved int16_t.
+     *            constraints: 16-byte aligned
+     * @param src source array of float arrays, one for each channel.
+     *            constraints: 16-byte aligned
+     * @param len number of elements to convert.
+     *            constraints: multiple of 8
+     * @param channels number of channels
+     */
+    void (*float_to_int16_interleave)(int16_t *dst, const float **src,
+                                      long len, int channels);
+} FmtConvertContext;
+
+void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx);
+
+void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx);
+void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx);
+void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx);
+
+#endif /* AVCODEC_FMTCONVERT_H */