mirror of https://github.com/FreeRDP/FreeRDP
221 lines
7.0 KiB
C
221 lines
7.0 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol client.
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* RemoteFX Codec Library - Encode
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*
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* Copyright 2011 Vic Lee
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "rfx_types.h"
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#include "rfx_rlgr.h"
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#include "rfx_differential.h"
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#include "rfx_quantization.h"
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#include "rfx_dwt.h"
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#include "rfx_encode.h"
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#define MINMAX(_v,_l,_h) ((_v) < (_l) ? (_l) : ((_v) > (_h) ? (_h) : (_v)))
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static void rfx_encode_format_rgb(const uint8* rgb_data, int width, int height, int rowstride,
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RFX_PIXEL_FORMAT pixel_format, sint16* r_buf, sint16* g_buf, sint16* b_buf)
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{
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int x, y;
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int x_exceed;
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int y_exceed;
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const uint8* src;
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sint16 r, g, b;
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sint16 *r_last, *g_last, *b_last;
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x_exceed = 64 - width;
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y_exceed = 64 - height;
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for (y = 0; y < height; y++)
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{
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src = rgb_data + y * rowstride;
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switch (pixel_format)
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{
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case RFX_PIXEL_FORMAT_BGRA:
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for (x = 0; x < width; x++)
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{
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*b_buf++ = (sint16) (*src++);
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*g_buf++ = (sint16) (*src++);
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*r_buf++ = (sint16) (*src++);
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src++;
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}
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break;
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case RFX_PIXEL_FORMAT_RGBA:
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for (x = 0; x < width; x++)
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{
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*r_buf++ = (sint16) (*src++);
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*g_buf++ = (sint16) (*src++);
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*b_buf++ = (sint16) (*src++);
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src++;
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}
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break;
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case RFX_PIXEL_FORMAT_BGR:
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for (x = 0; x < width; x++)
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{
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*b_buf++ = (sint16) (*src++);
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*g_buf++ = (sint16) (*src++);
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*r_buf++ = (sint16) (*src++);
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}
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break;
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case RFX_PIXEL_FORMAT_RGB:
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for (x = 0; x < width; x++)
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{
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*r_buf++ = (sint16) (*src++);
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*g_buf++ = (sint16) (*src++);
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*b_buf++ = (sint16) (*src++);
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}
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break;
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default:
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break;
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}
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/* Fill the horizontal region outside of 64x64 tile size with the right-most pixel for best quality */
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if (x_exceed > 0)
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{
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r = *(r_buf - 1);
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g = *(g_buf - 1);
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b = *(b_buf - 1);
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for (x = 0; x < x_exceed; x++)
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{
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*r_buf++ = r;
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*g_buf++ = g;
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*b_buf++ = b;
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}
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}
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}
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/* Fill the vertical region outside of 64x64 tile size with the last line. */
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if (y_exceed > 0)
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{
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r_last = r_buf - 64;
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g_last = g_buf - 64;
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b_last = b_buf - 64;
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while (y_exceed > 0)
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{
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memcpy(r_buf, r_last, 64 * sizeof(sint16));
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memcpy(g_buf, g_last, 64 * sizeof(sint16));
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memcpy(b_buf, b_last, 64 * sizeof(sint16));
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r_buf += 64;
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g_buf += 64;
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b_buf += 64;
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y_exceed--;
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}
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}
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}
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void rfx_encode_rgb_to_ycbcr(sint16* y_r_buf, sint16* cb_g_buf, sint16* cr_b_buf)
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{
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sint16 y, cb, cr;
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sint16 r, g, b;
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int i;
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/**
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* The encoded YCbCr coeffectients are represented as 11.5 fixed-point numbers:
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*
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* 1 sign bit + 10 integer bits + 5 fractional bits
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*
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* However only 7 integer bits will be actually used since the value range is [-128.0, 127.0].
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* In other words, the encoded coeffectients is scaled by << 5 when intepreted as sint16.
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* It will be scaled down to original during the quantization phase.
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*/
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for (i = 0; i < 4096; i++)
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{
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r = y_r_buf[i];
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g = cb_g_buf[i];
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b = cr_b_buf[i];
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/* 0.299 << 5 = 1001.10010001(b), 0.587 << 5 = 10010.11001000(b), 0.114 << 5 = 11.10100101(b) */
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y = ((r << 3) + (r) + (r >> 1) + (r >> 4) + (r >> 7)) +
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((g << 4) + (g << 1) + (g >> 1) + (g >> 2) + (g >> 5)) +
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((b << 1) + (b) + (b >> 1) + (b >> 3) + (b >> 6) + (b >> 7));
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y_r_buf[i] = MINMAX(y - 4096, -4096, 4095);
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/* 0.168935 << 5 = 101.01100111(b), 0.331665 << 5 = 1010.10011100(b), 0.50059 << 5 = 10000.00000100(b) */
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cb = 0 - ((r << 2) + (r) + (r >> 2) + (r >> 3) + (r >> 5)) -
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((g << 3) + (g << 1) + (g >> 1) + (g >> 4) + (g >> 5) + (g >> 6)) +
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((b << 4) + (b >> 6));
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cb_g_buf[i] = MINMAX(cb, -4096, 4095);
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/* 0.499813 << 5 = 1111.11111110(b), 0.418531 << 5 = 1101.01100100(b), 0.081282 << 5 = 10.10011001(b) */
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cr = ((r << 4) - (r >> 7)) -
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((g << 3) + (g << 2) + (g) + (g >> 2) + (g >> 3) + (g >> 6)) -
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((b << 1) + (b >> 1) + (b >> 4) + (b >> 5) + (b >> 7));
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cr_b_buf[i] = MINMAX(cr, -4096, 4095);
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}
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}
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static void rfx_encode_component(RFX_CONTEXT* context, const uint32* quantization_values,
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sint16* data, uint8* buffer, int buffer_size, int* size)
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{
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PROFILER_ENTER(context->priv->prof_rfx_encode_component);
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PROFILER_ENTER(context->priv->prof_rfx_dwt_2d_encode);
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context->dwt_2d_encode(data, context->priv->dwt_buffer);
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PROFILER_EXIT(context->priv->prof_rfx_dwt_2d_encode);
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PROFILER_ENTER(context->priv->prof_rfx_quantization_encode);
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context->quantization_encode(data, quantization_values);
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PROFILER_EXIT(context->priv->prof_rfx_quantization_encode);
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PROFILER_ENTER(context->priv->prof_rfx_differential_encode);
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rfx_differential_encode(data + 4032, 64);
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PROFILER_EXIT(context->priv->prof_rfx_differential_encode);
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PROFILER_ENTER(context->priv->prof_rfx_rlgr_encode);
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*size = rfx_rlgr_encode(context->mode, data, 4096, buffer, buffer_size);
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PROFILER_EXIT(context->priv->prof_rfx_rlgr_encode);
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PROFILER_EXIT(context->priv->prof_rfx_encode_component);
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}
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void rfx_encode_rgb(RFX_CONTEXT* context, const uint8* rgb_data, int width, int height, int rowstride,
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const uint32* y_quants, const uint32* cb_quants, const uint32* cr_quants,
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STREAM* data_out, int* y_size, int* cb_size, int* cr_size)
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{
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sint16* y_r_buffer = context->priv->y_r_buffer;
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sint16* cb_g_buffer = context->priv->cb_g_buffer;
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sint16* cr_b_buffer = context->priv->cr_b_buffer;
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PROFILER_ENTER(context->priv->prof_rfx_encode_rgb);
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PROFILER_ENTER(context->priv->prof_rfx_encode_format_rgb);
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rfx_encode_format_rgb(rgb_data, width, height, rowstride,
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context->pixel_format, y_r_buffer, cb_g_buffer, cr_b_buffer);
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PROFILER_EXIT(context->priv->prof_rfx_encode_format_rgb);
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PROFILER_ENTER(context->priv->prof_rfx_encode_rgb_to_ycbcr);
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context->encode_rgb_to_ycbcr(context->priv->y_r_buffer, context->priv->cb_g_buffer, context->priv->cr_b_buffer);
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PROFILER_EXIT(context->priv->prof_rfx_encode_rgb_to_ycbcr);
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/* Ensure the buffer is reasonably large enough */
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stream_check_size(data_out, 4096);
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rfx_encode_component(context, y_quants, context->priv->y_r_buffer,
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stream_get_tail(data_out), stream_get_left(data_out), y_size);
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stream_seek(data_out, *y_size);
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stream_check_size(data_out, 4096);
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rfx_encode_component(context, cb_quants, context->priv->cb_g_buffer,
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stream_get_tail(data_out), stream_get_left(data_out), cb_size);
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stream_seek(data_out, *cb_size);
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stream_check_size(data_out, 4096);
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rfx_encode_component(context, cr_quants, context->priv->cr_b_buffer,
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stream_get_tail(data_out), stream_get_left(data_out), cr_size);
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stream_seek(data_out, *cr_size);
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PROFILER_EXIT(context->priv->prof_rfx_encode_rgb);
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}
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