swscale_unscaled.c

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/*
 * Copyright (C) 2013 Xiaolei Yu <dreifachstein@gmail.com>
 *
 * 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
 */

#include "config.h"
#include "libswscale/swscale.h"
#include "libswscale/swscale_internal.h"
#include "libavutil/arm/cpu.h"

extern void rgbx_to_nv12_neon_32(const uint8_t *src, uint8_t *y, uint8_t *chroma,
                int width, int height,
                int y_stride, int c_stride, int src_stride,
                int32_t coeff_tbl[9]);

extern void rgbx_to_nv12_neon_16(const uint8_t *src, uint8_t *y, uint8_t *chroma,
                int width, int height,
                int y_stride, int c_stride, int src_stride,
                int32_t coeff_tbl[9]);

static int rgbx_to_nv12_neon_32_wrapper(SwsContext *context, const uint8_t *src[],
                        int srcStride[], int srcSliceY, int srcSliceH,
                        uint8_t *dst[], int dstStride[]) {

    rgbx_to_nv12_neon_32(src[0] + srcSliceY * srcStride[0],
            dst[0] + srcSliceY * dstStride[0],
            dst[1] + (srcSliceY / 2) * dstStride[1],
            context->srcW, srcSliceH,
            dstStride[0], dstStride[1], srcStride[0],
            context->input_rgb2yuv_table);

    return 0;
}

static int rgbx_to_nv12_neon_16_wrapper(SwsContext *context, const uint8_t *src[],
                        int srcStride[], int srcSliceY, int srcSliceH,
                        uint8_t *dst[], int dstStride[]) {

    rgbx_to_nv12_neon_16(src[0] + srcSliceY * srcStride[0],
            dst[0] + srcSliceY * dstStride[0],
            dst[1] + (srcSliceY / 2) * dstStride[1],
            context->srcW, srcSliceH,
            dstStride[0], dstStride[1], srcStride[0],
            context->input_rgb2yuv_table);

    return 0;
}

static void get_unscaled_swscale_neon(SwsContext *c) {
    int accurate_rnd = c->flags & SWS_ACCURATE_RND;
    if (c->srcFormat == AV_PIX_FMT_RGBA
            && c->dstFormat == AV_PIX_FMT_NV12
            && (c->srcW >= 16)) {
        c->swscale = accurate_rnd ? rgbx_to_nv12_neon_32_wrapper
                        : rgbx_to_nv12_neon_16_wrapper;
    }
}

void ff_get_unscaled_swscale_arm(SwsContext *c)
{
    int cpu_flags = av_get_cpu_flags();
    if (have_neon(cpu_flags))
        get_unscaled_swscale_neon(c);
}