/* Spa */
/* SPDX-FileCopyrightText: Copyright © 2019 Wim Taymans */
/* SPDX-License-Identifier: MIT */

#include <string.h>
#include <stdio.h>
#include <math.h>

#include <spa/support/cpu.h>
#include <spa/utils/defs.h>
#include <spa/param/audio/format-utils.h>

#include "mix-ops.h"

typedef void (*mix_func_t) (struct mix_ops *ops, void * SPA_RESTRICT dst,
		const void * SPA_RESTRICT src[], uint32_t n_src, uint32_t n_samples);

struct mix_info {
	uint32_t fmt;
	uint32_t n_channels;
	uint32_t cpu_flags;
	uint32_t stride;
	mix_func_t process;
};

static struct mix_info mix_table[] =
{
	/* f32 */
#if defined(HAVE_AVX)
	{ SPA_AUDIO_FORMAT_F32, 0, SPA_CPU_FLAG_AVX, 4, mix_f32_avx },
	{ SPA_AUDIO_FORMAT_F32P, 0, SPA_CPU_FLAG_AVX, 4, mix_f32_avx },
#endif
#if defined (HAVE_SSE)
	{ SPA_AUDIO_FORMAT_F32, 0, SPA_CPU_FLAG_SSE, 4, mix_f32_sse },
	{ SPA_AUDIO_FORMAT_F32P, 0, SPA_CPU_FLAG_SSE, 4, mix_f32_sse },
#endif
	{ SPA_AUDIO_FORMAT_F32, 0, 0, 4, mix_f32_c },
	{ SPA_AUDIO_FORMAT_F32P, 0, 0, 4, mix_f32_c },

	/* f64 */
#if defined (HAVE_SSE2)
	{ SPA_AUDIO_FORMAT_F64, 0, SPA_CPU_FLAG_SSE2, 8, mix_f64_sse2 },
	{ SPA_AUDIO_FORMAT_F64P, 0, SPA_CPU_FLAG_SSE2, 8, mix_f64_sse2 },
#endif
	{ SPA_AUDIO_FORMAT_F64, 0, 0, 8, mix_f64_c },
	{ SPA_AUDIO_FORMAT_F64P, 0, 0, 8, mix_f64_c },

	/* s8 */
	{ SPA_AUDIO_FORMAT_S8, 0, 0, 1, mix_s8_c },
	{ SPA_AUDIO_FORMAT_S8P, 0, 0, 1, mix_s8_c },
	{ SPA_AUDIO_FORMAT_U8, 0, 0, 1, mix_u8_c },
	{ SPA_AUDIO_FORMAT_U8P, 0, 0, 1, mix_u8_c },

	/* s16 */
	{ SPA_AUDIO_FORMAT_S16, 0, 0, 2, mix_s16_c },
	{ SPA_AUDIO_FORMAT_S16P, 0, 0, 2, mix_s16_c },
	{ SPA_AUDIO_FORMAT_U16, 0, 0, 2, mix_u16_c },

	/* s24 */
	{ SPA_AUDIO_FORMAT_S24, 0, 0, 3, mix_s24_c },
	{ SPA_AUDIO_FORMAT_S24P, 0, 0, 3, mix_s24_c },
	{ SPA_AUDIO_FORMAT_U24, 0, 0, 3, mix_u24_c },

	/* s32 */
	{ SPA_AUDIO_FORMAT_S32, 0, 0, 4, mix_s32_c },
	{ SPA_AUDIO_FORMAT_S32P, 0, 0, 4, mix_s32_c },
	{ SPA_AUDIO_FORMAT_U32, 0, 0, 4, mix_u32_c },

	/* s24_32 */
	{ SPA_AUDIO_FORMAT_S24_32, 0, 0, 4, mix_s24_32_c },
	{ SPA_AUDIO_FORMAT_S24_32P, 0, 0, 4, mix_s24_32_c },
	{ SPA_AUDIO_FORMAT_U24_32, 0, 0, 4, mix_u24_32_c },
};

#define MATCH_CHAN(a,b)		((a) == 0 || (a) == (b))
#define MATCH_CPU_FLAGS(a,b)	((a) == 0 || ((a) & (b)) == a)

static const struct mix_info *find_mix_info(uint32_t fmt,
		uint32_t n_channels, uint32_t cpu_flags)
{
	SPA_FOR_EACH_ELEMENT_VAR(mix_table, t) {
		if (t->fmt == fmt &&
		    MATCH_CHAN(t->n_channels, n_channels) &&
		    MATCH_CPU_FLAGS(t->cpu_flags, cpu_flags))
			return t;
	}
	return NULL;
}

static void impl_mix_ops_clear(struct mix_ops *ops, void * SPA_RESTRICT dst, uint32_t n_samples)
{
	const struct mix_info *info = ops->priv;
	memset(dst, 0, n_samples * info->stride);
}

static void impl_mix_ops_free(struct mix_ops *ops)
{
	spa_zero(*ops);
}

int mix_ops_init(struct mix_ops *ops)
{
	const struct mix_info *info;

	info = find_mix_info(ops->fmt, ops->n_channels, ops->cpu_flags);
	if (info == NULL)
		return -ENOTSUP;

	ops->priv = info;
	ops->cpu_flags = info->cpu_flags;
	ops->clear = impl_mix_ops_clear;
	ops->process = info->process;
	ops->free = impl_mix_ops_free;

	return 0;
}
