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Diffstat (limited to 'media/libvpx/libvpx/vpx_scale/generic/vpx_scale.c')
-rw-r--r--media/libvpx/libvpx/vpx_scale/generic/vpx_scale.c529
1 files changed, 529 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_scale/generic/vpx_scale.c b/media/libvpx/libvpx/vpx_scale/generic/vpx_scale.c
new file mode 100644
index 0000000000..958bb320fc
--- /dev/null
+++ b/media/libvpx/libvpx/vpx_scale/generic/vpx_scale.c
@@ -0,0 +1,529 @@
+/*
+ * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+/****************************************************************************
+ *
+ * Module Title : scale.c
+ *
+ * Description : Image scaling functions.
+ *
+ ***************************************************************************/
+
+/****************************************************************************
+ * Header Files
+ ****************************************************************************/
+#include "./vpx_scale_rtcd.h"
+#include "vpx_mem/vpx_mem.h"
+#include "vpx_scale/vpx_scale.h"
+#include "vpx_scale/yv12config.h"
+
+typedef struct {
+ int expanded_frame_width;
+ int expanded_frame_height;
+
+ int HScale;
+ int HRatio;
+ int VScale;
+ int VRatio;
+
+ YV12_BUFFER_CONFIG *src_yuv_config;
+ YV12_BUFFER_CONFIG *dst_yuv_config;
+
+} SCALE_VARS;
+
+/****************************************************************************
+ *
+ * ROUTINE : scale1d_2t1_i
+ *
+ * INPUTS : const unsigned char *source : Pointer to data to be scaled.
+ * int source_step : Number of pixels to step on in
+ * source.
+ * unsigned int source_scale : Scale for source (UNUSED).
+ * unsigned int source_length : Length of source (UNUSED).
+ * unsigned char *dest : Pointer to output data array.
+ * int dest_step : Number of pixels to step on in
+ * destination.
+ * unsigned int dest_scale : Scale for destination
+ * (UNUSED).
+ * unsigned int dest_length : Length of destination.
+ *
+ * OUTPUTS : None.
+ *
+ * RETURNS : void
+ *
+ * FUNCTION : Performs 2-to-1 interpolated scaling.
+ *
+ * SPECIAL NOTES : None.
+ *
+ ****************************************************************************/
+static void scale1d_2t1_i(const unsigned char *source, int source_step,
+ unsigned int source_scale, unsigned int source_length,
+ unsigned char *dest, int dest_step,
+ unsigned int dest_scale, unsigned int dest_length) {
+ unsigned int i, j;
+ unsigned int temp;
+ int source_pitch = source_step;
+ (void)source_length;
+ (void)source_scale;
+ (void)dest_scale;
+
+ source_step *= 2;
+ dest[0] = source[0];
+
+ for (i = dest_step, j = source_step; i < dest_length * dest_step;
+ i += dest_step, j += source_step) {
+ temp = 8;
+ temp += 3 * source[j - source_pitch];
+ temp += 10 * source[j];
+ temp += 3 * source[j + source_pitch];
+ temp >>= 4;
+ dest[i] = (char)(temp);
+ }
+}
+
+/****************************************************************************
+ *
+ * ROUTINE : scale1d_2t1_ps
+ *
+ * INPUTS : const unsigned char *source : Pointer to data to be scaled.
+ * int source_step : Number of pixels to step on in
+ * source.
+ * unsigned int source_scale : Scale for source (UNUSED).
+ * unsigned int source_length : Length of source (UNUSED).
+ * unsigned char *dest : Pointer to output data array.
+ * int dest_step : Number of pixels to step on in
+ * destination.
+ * unsigned int dest_scale : Scale for destination
+ * (UNUSED).
+ * unsigned int dest_length : Length of destination.
+ *
+ * OUTPUTS : None.
+ *
+ * RETURNS : void
+ *
+ * FUNCTION : Performs 2-to-1 point subsampled scaling.
+ *
+ * SPECIAL NOTES : None.
+ *
+ ****************************************************************************/
+static void scale1d_2t1_ps(const unsigned char *source, int source_step,
+ unsigned int source_scale,
+ unsigned int source_length, unsigned char *dest,
+ int dest_step, unsigned int dest_scale,
+ unsigned int dest_length) {
+ unsigned int i, j;
+
+ (void)source_length;
+ (void)source_scale;
+ (void)dest_scale;
+
+ source_step *= 2;
+ j = 0;
+
+ for (i = 0; i < dest_length * dest_step; i += dest_step, j += source_step)
+ dest[i] = source[j];
+}
+/****************************************************************************
+ *
+ * ROUTINE : scale1d_c
+ *
+ * INPUTS : const unsigned char *source : Pointer to data to be scaled.
+ * int source_step : Number of pixels to step on in
+ * source.
+ * unsigned int source_scale : Scale for source.
+ * unsigned int source_length : Length of source (UNUSED).
+ * unsigned char *dest : Pointer to output data array.
+ * int dest_step : Number of pixels to step on in
+ * destination.
+ * unsigned int dest_scale : Scale for destination.
+ * unsigned int dest_length : Length of destination.
+ *
+ * OUTPUTS : None.
+ *
+ * RETURNS : void
+ *
+ * FUNCTION : Performs linear interpolation in one dimension.
+ *
+ * SPECIAL NOTES : None.
+ *
+ ****************************************************************************/
+static void scale1d_c(const unsigned char *source, int source_step,
+ unsigned int source_scale, unsigned int source_length,
+ unsigned char *dest, int dest_step,
+ unsigned int dest_scale, unsigned int dest_length) {
+ unsigned int i;
+ unsigned int round_value = dest_scale / 2;
+ unsigned int left_modifier = dest_scale;
+ unsigned int right_modifier = 0;
+ unsigned char left_pixel = *source;
+ unsigned char right_pixel = *(source + source_step);
+
+ (void)source_length;
+
+ /* These asserts are needed if there are boundary issues... */
+ /*assert ( dest_scale > source_scale );*/
+ /*assert ( (source_length-1) * dest_scale >= (dest_length-1) * source_scale
+ * );*/
+
+ for (i = 0; i < dest_length * dest_step; i += dest_step) {
+ dest[i] = (char)((left_modifier * left_pixel +
+ right_modifier * right_pixel + round_value) /
+ dest_scale);
+
+ right_modifier += source_scale;
+
+ while (right_modifier > dest_scale) {
+ right_modifier -= dest_scale;
+ source += source_step;
+ left_pixel = *source;
+ right_pixel = *(source + source_step);
+ }
+
+ left_modifier = dest_scale - right_modifier;
+ }
+}
+
+/****************************************************************************
+ *
+ * ROUTINE : Scale2D
+ *
+ * INPUTS : const unsigned char *source : Pointer to data to be
+ * scaled.
+ * int source_pitch : Stride of source image.
+ * unsigned int source_width : Width of input image.
+ * unsigned int source_height : Height of input image.
+ * unsigned char *dest : Pointer to output data
+ * array.
+ * int dest_pitch : Stride of destination
+ * image.
+ * unsigned int dest_width : Width of destination image.
+ * unsigned int dest_height : Height of destination
+ * image.
+ * unsigned char *temp_area : Pointer to temp work area.
+ * unsigned char temp_area_height : Height of temp work area.
+ * unsigned int hscale : Horizontal scale factor
+ * numerator.
+ * unsigned int hratio : Horizontal scale factor
+ * denominator.
+ * unsigned int vscale : Vertical scale factor
+ * numerator.
+ * unsigned int vratio : Vertical scale factor
+ * denominator.
+ * unsigned int interlaced : Interlace flag.
+ *
+ * OUTPUTS : None.
+ *
+ * RETURNS : void
+ *
+ * FUNCTION : Performs 2-tap linear interpolation in two dimensions.
+ *
+ * SPECIAL NOTES : Expansion is performed one band at a time to help with
+ * caching.
+ *
+ ****************************************************************************/
+static void Scale2D(
+ /*const*/
+ unsigned char *source, int source_pitch, unsigned int source_width,
+ unsigned int source_height, unsigned char *dest, int dest_pitch,
+ unsigned int dest_width, unsigned int dest_height, unsigned char *temp_area,
+ unsigned char temp_area_height, unsigned int hscale, unsigned int hratio,
+ unsigned int vscale, unsigned int vratio, unsigned int interlaced) {
+ /*unsigned*/
+ int i, j, k;
+ int bands;
+ int dest_band_height;
+ int source_band_height;
+
+ typedef void (*Scale1D)(const unsigned char *source, int source_step,
+ unsigned int source_scale, unsigned int source_length,
+ unsigned char *dest, int dest_step,
+ unsigned int dest_scale, unsigned int dest_length);
+
+ Scale1D Scale1Dv = scale1d_c;
+ Scale1D Scale1Dh = scale1d_c;
+
+ void (*horiz_line_scale)(const unsigned char *, unsigned int, unsigned char *,
+ unsigned int) = NULL;
+ void (*vert_band_scale)(unsigned char *, unsigned int, unsigned char *,
+ unsigned int, unsigned int) = NULL;
+
+ int ratio_scalable = 1;
+ int interpolation = 0;
+
+ unsigned char *source_base;
+ unsigned char *line_src;
+
+ source_base = (unsigned char *)source;
+
+ if (source_pitch < 0) {
+ int offset;
+
+ offset = (source_height - 1);
+ offset *= source_pitch;
+
+ source_base += offset;
+ }
+
+ /* find out the ratio for each direction */
+ switch (hratio * 10 / hscale) {
+ case 8:
+ /* 4-5 Scale in Width direction */
+ horiz_line_scale = vp8_horizontal_line_5_4_scale;
+ break;
+ case 6:
+ /* 3-5 Scale in Width direction */
+ horiz_line_scale = vp8_horizontal_line_5_3_scale;
+ break;
+ case 5:
+ /* 1-2 Scale in Width direction */
+ horiz_line_scale = vp8_horizontal_line_2_1_scale;
+ break;
+ default:
+ /* The ratio is not acceptable now */
+ /* throw("The ratio is not acceptable for now!"); */
+ ratio_scalable = 0;
+ break;
+ }
+
+ switch (vratio * 10 / vscale) {
+ case 8:
+ /* 4-5 Scale in vertical direction */
+ vert_band_scale = vp8_vertical_band_5_4_scale;
+ source_band_height = 5;
+ dest_band_height = 4;
+ break;
+ case 6:
+ /* 3-5 Scale in vertical direction */
+ vert_band_scale = vp8_vertical_band_5_3_scale;
+ source_band_height = 5;
+ dest_band_height = 3;
+ break;
+ case 5:
+ /* 1-2 Scale in vertical direction */
+
+ if (interlaced) {
+ /* if the content is interlaced, point sampling is used */
+ vert_band_scale = vp8_vertical_band_2_1_scale;
+ } else {
+ interpolation = 1;
+ /* if the content is progressive, interplo */
+ vert_band_scale = vp8_vertical_band_2_1_scale_i;
+ }
+
+ source_band_height = 2;
+ dest_band_height = 1;
+ break;
+ default:
+ /* The ratio is not acceptable now */
+ /* throw("The ratio is not acceptable for now!"); */
+ ratio_scalable = 0;
+ break;
+ }
+
+ if (ratio_scalable) {
+ if (source_height == dest_height) {
+ /* for each band of the image */
+ for (k = 0; k < (int)dest_height; k++) {
+ horiz_line_scale(source, source_width, dest, dest_width);
+ source += source_pitch;
+ dest += dest_pitch;
+ }
+
+ return;
+ }
+
+ if (interpolation) {
+ if (source < source_base) source = source_base;
+
+ horiz_line_scale(source, source_width, temp_area, dest_width);
+ }
+
+ for (k = 0;
+ k < (int)(dest_height + dest_band_height - 1) / dest_band_height;
+ k++) {
+ /* scale one band horizontally */
+ for (i = 0; i < source_band_height; i++) {
+ /* Trap case where we could read off the base of the source buffer */
+
+ line_src = (unsigned char *)source + i * source_pitch;
+
+ if (line_src < source_base) line_src = source_base;
+
+ horiz_line_scale(line_src, source_width,
+ temp_area + (i + 1) * dest_pitch, dest_width);
+ }
+
+ /* Vertical scaling is in place */
+ vert_band_scale(temp_area + dest_pitch, dest_pitch, dest, dest_pitch,
+ dest_width);
+
+ if (interpolation)
+ memcpy(temp_area, temp_area + source_band_height * dest_pitch,
+ dest_width);
+
+ /* Next band... */
+ source += (unsigned long)source_band_height * source_pitch;
+ dest += (unsigned long)dest_band_height * dest_pitch;
+ }
+
+ return;
+ }
+
+ if (hscale == 2 && hratio == 1) Scale1Dh = scale1d_2t1_ps;
+
+ if (vscale == 2 && vratio == 1) {
+ if (interlaced)
+ Scale1Dv = scale1d_2t1_ps;
+ else
+ Scale1Dv = scale1d_2t1_i;
+ }
+
+ if (source_height == dest_height) {
+ /* for each band of the image */
+ for (k = 0; k < (int)dest_height; k++) {
+ Scale1Dh(source, 1, hscale, source_width + 1, dest, 1, hratio,
+ dest_width);
+ source += source_pitch;
+ dest += dest_pitch;
+ }
+
+ return;
+ }
+
+ if (dest_height > source_height) {
+ dest_band_height = temp_area_height - 1;
+ source_band_height = dest_band_height * source_height / dest_height;
+ } else {
+ source_band_height = temp_area_height - 1;
+ dest_band_height = source_band_height * vratio / vscale;
+ }
+
+ /* first row needs to be done so that we can stay one row ahead for vertical
+ * zoom */
+ Scale1Dh(source, 1, hscale, source_width + 1, temp_area, 1, hratio,
+ dest_width);
+
+ /* for each band of the image */
+ bands = (dest_height + dest_band_height - 1) / dest_band_height;
+
+ for (k = 0; k < bands; k++) {
+ /* scale one band horizontally */
+ for (i = 1; i < source_band_height + 1; i++) {
+ if (k * source_band_height + i < (int)source_height) {
+ Scale1Dh(source + i * source_pitch, 1, hscale, source_width + 1,
+ temp_area + i * dest_pitch, 1, hratio, dest_width);
+ } else { /* Duplicate the last row */
+ /* copy temp_area row 0 over from last row in the past */
+ memcpy(temp_area + i * dest_pitch, temp_area + (i - 1) * dest_pitch,
+ dest_pitch);
+ }
+ }
+
+ /* scale one band vertically */
+ for (j = 0; j < (int)dest_width; j++) {
+ Scale1Dv(&temp_area[j], dest_pitch, vscale, source_band_height + 1,
+ &dest[j], dest_pitch, vratio, dest_band_height);
+ }
+
+ /* copy temp_area row 0 over from last row in the past */
+ memcpy(temp_area, temp_area + source_band_height * dest_pitch, dest_pitch);
+
+ /* move to the next band */
+ source += source_band_height * source_pitch;
+ dest += dest_band_height * dest_pitch;
+ }
+}
+
+/****************************************************************************
+ *
+ * ROUTINE : vpx_scale_frame
+ *
+ * INPUTS : YV12_BUFFER_CONFIG *src : Pointer to frame to be
+ * scaled.
+ * YV12_BUFFER_CONFIG *dst : Pointer to buffer to hold
+ * scaled frame.
+ * unsigned char *temp_area : Pointer to temp work area.
+ * unsigned char temp_area_height : Height of temp work area.
+ * unsigned int hscale : Horizontal scale factor
+ * numerator.
+ * unsigned int hratio : Horizontal scale factor
+ * denominator.
+ * unsigned int vscale : Vertical scale factor
+ * numerator.
+ * unsigned int vratio : Vertical scale factor
+ * denominator.
+ * unsigned int interlaced : Interlace flag.
+ *
+ * OUTPUTS : None.
+ *
+ * RETURNS : void
+ *
+ * FUNCTION : Performs 2-tap linear interpolation in two dimensions.
+ *
+ * SPECIAL NOTES : Expansion is performed one band at a time to help with
+ * caching.
+ *
+ ****************************************************************************/
+void vpx_scale_frame(YV12_BUFFER_CONFIG *src, YV12_BUFFER_CONFIG *dst,
+ unsigned char *temp_area, unsigned char temp_height,
+ unsigned int hscale, unsigned int hratio,
+ unsigned int vscale, unsigned int vratio,
+ unsigned int interlaced) {
+ int i;
+ int dw = (hscale - 1 + src->y_width * hratio) / hscale;
+ int dh = (vscale - 1 + src->y_height * vratio) / vscale;
+
+ /* call our internal scaling routines!! */
+ Scale2D((unsigned char *)src->y_buffer, src->y_stride, src->y_width,
+ src->y_height, (unsigned char *)dst->y_buffer, dst->y_stride, dw, dh,
+ temp_area, temp_height, hscale, hratio, vscale, vratio, interlaced);
+
+ if (dw < (int)dst->y_width)
+ for (i = 0; i < dh; i++)
+ memset(dst->y_buffer + i * dst->y_stride + dw - 1,
+ dst->y_buffer[i * dst->y_stride + dw - 2], dst->y_width - dw + 1);
+
+ if (dh < (int)dst->y_height)
+ for (i = dh - 1; i < (int)dst->y_height; i++)
+ memcpy(dst->y_buffer + i * dst->y_stride,
+ dst->y_buffer + (dh - 2) * dst->y_stride, dst->y_width + 1);
+
+ Scale2D((unsigned char *)src->u_buffer, src->uv_stride, src->uv_width,
+ src->uv_height, (unsigned char *)dst->u_buffer, dst->uv_stride,
+ dw / 2, dh / 2, temp_area, temp_height, hscale, hratio, vscale,
+ vratio, interlaced);
+
+ if (dw / 2 < (int)dst->uv_width)
+ for (i = 0; i < dst->uv_height; i++)
+ memset(dst->u_buffer + i * dst->uv_stride + dw / 2 - 1,
+ dst->u_buffer[i * dst->uv_stride + dw / 2 - 2],
+ dst->uv_width - dw / 2 + 1);
+
+ if (dh / 2 < (int)dst->uv_height)
+ for (i = dh / 2 - 1; i < (int)dst->y_height / 2; i++)
+ memcpy(dst->u_buffer + i * dst->uv_stride,
+ dst->u_buffer + (dh / 2 - 2) * dst->uv_stride, dst->uv_width);
+
+ Scale2D((unsigned char *)src->v_buffer, src->uv_stride, src->uv_width,
+ src->uv_height, (unsigned char *)dst->v_buffer, dst->uv_stride,
+ dw / 2, dh / 2, temp_area, temp_height, hscale, hratio, vscale,
+ vratio, interlaced);
+
+ if (dw / 2 < (int)dst->uv_width)
+ for (i = 0; i < dst->uv_height; i++)
+ memset(dst->v_buffer + i * dst->uv_stride + dw / 2 - 1,
+ dst->v_buffer[i * dst->uv_stride + dw / 2 - 2],
+ dst->uv_width - dw / 2 + 1);
+
+ if (dh / 2 < (int)dst->uv_height)
+ for (i = dh / 2 - 1; i < (int)dst->y_height / 2; i++)
+ memcpy(dst->v_buffer + i * dst->uv_stride,
+ dst->v_buffer + (dh / 2 - 2) * dst->uv_stride, dst->uv_width);
+}
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