364 lines
9.9 KiB
C
364 lines
9.9 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol client.
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* NSCodec Encoder
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*
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* Copyright 2012 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 <stdint.h>
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#include <freerdp/codec/nsc.h>
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#include <freerdp/utils/memory.h>
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#include "nsc_types.h"
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#include "nsc_encode.h"
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static void nsc_context_initialize_encode(NSC_CONTEXT* context)
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{
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int i;
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uint32 length;
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uint32 tempWidth;
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uint32 tempHeight;
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tempWidth = ROUND_UP_TO(context->width, 8);
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tempHeight = ROUND_UP_TO(context->height, 2);
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/* The maximum length a decoded plane can reach in all cases */
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length = tempWidth * tempHeight + 16;
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if (length > context->priv->plane_buf_length)
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{
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for (i = 0; i < 5; i++)
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context->priv->plane_buf[i] = (uint8*) xrealloc(context->priv->plane_buf[i], length);
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context->priv->plane_buf_length = length;
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}
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if (context->nsc_stream.ChromaSubSamplingLevel > 0)
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{
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context->OrgByteCount[0] = tempWidth * context->height;
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context->OrgByteCount[1] = tempWidth * tempHeight / 4;
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context->OrgByteCount[2] = tempWidth * tempHeight / 4;
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context->OrgByteCount[3] = context->width * context->height;
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}
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else
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{
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context->OrgByteCount[0] = context->width * context->height;
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context->OrgByteCount[1] = context->width * context->height;
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context->OrgByteCount[2] = context->width * context->height;
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context->OrgByteCount[3] = context->width * context->height;
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}
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}
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static void nsc_encode_argb_to_aycocg(NSC_CONTEXT* context, uint8* bmpdata, int rowstride)
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{
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uint16 x;
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uint16 y;
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uint16 rw;
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uint8 ccl;
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uint8* src;
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uint8* yplane;
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uint8* coplane;
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uint8* cgplane;
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uint8* aplane;
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sint16 r_val;
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sint16 g_val;
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sint16 b_val;
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uint8 a_val;
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uint32 tempWidth;
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uint32 tempHeight;
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tempWidth = ROUND_UP_TO(context->width, 8);
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tempHeight = ROUND_UP_TO(context->height, 2);
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rw = (context->nsc_stream.ChromaSubSamplingLevel > 0 ? tempWidth : context->width);
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ccl = context->nsc_stream.ColorLossLevel;
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yplane = context->priv->plane_buf[0];
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coplane = context->priv->plane_buf[1];
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cgplane = context->priv->plane_buf[2];
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aplane = context->priv->plane_buf[3];
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for (y = 0; y < context->height; y++)
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{
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src = bmpdata + (context->height - 1 - y) * rowstride;
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yplane = context->priv->plane_buf[0] + y * rw;
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coplane = context->priv->plane_buf[1] + y * rw;
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cgplane = context->priv->plane_buf[2] + y * rw;
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aplane = context->priv->plane_buf[3] + y * context->width;
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for (x = 0; x < context->width; x++)
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{
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switch (context->pixel_format)
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{
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case RDP_PIXEL_FORMAT_B8G8R8A8:
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b_val = *src++;
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g_val = *src++;
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r_val = *src++;
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a_val = *src++;
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break;
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case RDP_PIXEL_FORMAT_R8G8B8A8:
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r_val = *src++;
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g_val = *src++;
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b_val = *src++;
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a_val = *src++;
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break;
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case RDP_PIXEL_FORMAT_B8G8R8:
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b_val = *src++;
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g_val = *src++;
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r_val = *src++;
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a_val = 0xFF;
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break;
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case RDP_PIXEL_FORMAT_R8G8B8:
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r_val = *src++;
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g_val = *src++;
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b_val = *src++;
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a_val = 0xFF;
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break;
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case RDP_PIXEL_FORMAT_B5G6R5_LE:
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b_val = (sint16) (((*(src + 1)) & 0xF8) | ((*(src + 1)) >> 5));
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g_val = (sint16) ((((*(src + 1)) & 0x07) << 5) | (((*src) & 0xE0) >> 3));
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r_val = (sint16) ((((*src) & 0x1F) << 3) | (((*src) >> 2) & 0x07));
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a_val = 0xFF;
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src += 2;
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break;
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case RDP_PIXEL_FORMAT_R5G6B5_LE:
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r_val = (sint16) (((*(src + 1)) & 0xF8) | ((*(src + 1)) >> 5));
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g_val = (sint16) ((((*(src + 1)) & 0x07) << 5) | (((*src) & 0xE0) >> 3));
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b_val = (sint16) ((((*src) & 0x1F) << 3) | (((*src) >> 2) & 0x07));
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a_val = 0xFF;
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src += 2;
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break;
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case RDP_PIXEL_FORMAT_P4_PLANER:
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{
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int shift;
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uint8 idx;
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shift = (7 - (x % 8));
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idx = ((*src) >> shift) & 1;
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idx |= (((*(src + 1)) >> shift) & 1) << 1;
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idx |= (((*(src + 2)) >> shift) & 1) << 2;
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idx |= (((*(src + 3)) >> shift) & 1) << 3;
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idx *= 3;
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r_val = (sint16) context->palette[idx];
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g_val = (sint16) context->palette[idx + 1];
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b_val = (sint16) context->palette[idx + 2];
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if (shift == 0)
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src += 4;
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}
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a_val = 0xFF;
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break;
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case RDP_PIXEL_FORMAT_P8:
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{
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int idx = (*src) * 3;
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r_val = (sint16) context->palette[idx];
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g_val = (sint16) context->palette[idx + 1];
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b_val = (sint16) context->palette[idx + 2];
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src++;
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}
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a_val = 0xFF;
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break;
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default:
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r_val = g_val = b_val = a_val = 0;
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break;
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}
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*yplane++ = (uint8) ((r_val >> 2) + (g_val >> 1) + (b_val >> 2));
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/* Perform color loss reduction here */
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*coplane++ = (uint8) ((r_val - b_val) >> ccl);
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*cgplane++ = (uint8) ((-(r_val >> 1) + g_val - (b_val >> 1)) >> ccl);
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*aplane++ = a_val;
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}
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if (context->nsc_stream.ChromaSubSamplingLevel > 0 && (x % 2) == 1)
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{
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*yplane = *(yplane - 1);
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*coplane = *(coplane - 1);
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*cgplane = *(cgplane - 1);
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}
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}
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if (context->nsc_stream.ChromaSubSamplingLevel > 0 && (y % 2) == 1)
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{
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memcpy(yplane + rw, yplane, rw);
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memcpy(coplane + rw, coplane, rw);
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memcpy(cgplane + rw, cgplane, rw);
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}
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}
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static void nsc_encode_subsampling(NSC_CONTEXT* context)
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{
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uint16 x;
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uint16 y;
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uint8* co_dst;
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uint8* cg_dst;
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sint8* co_src0;
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sint8* co_src1;
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sint8* cg_src0;
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sint8* cg_src1;
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uint32 tempWidth;
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uint32 tempHeight;
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tempWidth = ROUND_UP_TO(context->width, 8);
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tempHeight = ROUND_UP_TO(context->height, 2);
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for (y = 0; y < tempHeight >> 1; y++)
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{
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co_dst = context->priv->plane_buf[1] + y * (tempWidth >> 1);
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cg_dst = context->priv->plane_buf[2] + y * (tempWidth >> 1);
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co_src0 = (sint8*) context->priv->plane_buf[1] + (y << 1) * tempWidth;
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co_src1 = co_src0 + tempWidth;
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cg_src0 = (sint8*) context->priv->plane_buf[2] + (y << 1) * tempWidth;
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cg_src1 = cg_src0 + tempWidth;
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for (x = 0; x < tempWidth >> 1; x++)
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{
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*co_dst++ = (uint8) (((sint16) *co_src0 + (sint16) *(co_src0 + 1) +
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(sint16) *co_src1 + (sint16) *(co_src1 + 1)) >> 2);
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*cg_dst++ = (uint8) (((sint16) *cg_src0 + (sint16) *(cg_src0 + 1) +
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(sint16) *cg_src1 + (sint16) *(cg_src1 + 1)) >> 2);
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co_src0 += 2;
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co_src1 += 2;
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cg_src0 += 2;
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cg_src1 += 2;
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}
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}
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}
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void nsc_encode(NSC_CONTEXT* context, uint8* bmpdata, int rowstride)
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{
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nsc_encode_argb_to_aycocg(context, bmpdata, rowstride);
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if (context->nsc_stream.ChromaSubSamplingLevel > 0)
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{
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nsc_encode_subsampling(context);
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}
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}
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static uint32 nsc_rle_encode(uint8* in, uint8* out, uint32 origsz)
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{
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uint32 left;
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uint32 runlength = 1;
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uint32 planesize = 0;
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left = origsz;
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/**
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* We quit the loop if the running compressed size is larger than the original.
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* In such cases data will be sent uncompressed.
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*/
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while (left > 4 && planesize < origsz - 4)
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{
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if (left > 5 && *in == *(in + 1))
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{
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runlength++;
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}
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else if (runlength == 1)
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{
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*out++ = *in;
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planesize++;
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}
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else if (runlength < 256)
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{
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*out++ = *in;
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*out++ = *in;
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*out++ = runlength - 2;
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runlength = 1;
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planesize += 3;
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}
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else
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{
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*out++ = *in;
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*out++ = *in;
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*out++ = 0xFF;
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*out++ = (runlength & 0x000000FF);
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*out++ = (runlength & 0x0000FF00) >> 8;
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*out++ = (runlength & 0x00FF0000) >> 16;
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*out++ = (runlength & 0xFF000000) >> 24;
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runlength = 1;
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planesize += 7;
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}
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in++;
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left--;
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}
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if (planesize < origsz - 4)
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{
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memcpy(out, in, 4);
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}
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planesize += 4;
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return planesize;
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}
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static void nsc_rle_compress_data(NSC_CONTEXT* context)
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{
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uint16 i;
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uint8* rle;
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uint32 origsize;
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uint32 planesize;
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rle = context->nsc_stream.Planes;
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for (i = 0; i < 4; i++)
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{
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origsize = context->OrgByteCount[i];
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if (origsize == 0)
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{
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planesize = 0;
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}
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else
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{
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planesize = nsc_rle_encode(context->priv->plane_buf[i],
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context->priv->plane_buf[4], origsize);
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if (planesize < origsize)
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memcpy(context->priv->plane_buf[i], context->priv->plane_buf[4], planesize);
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else
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planesize = origsize;
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}
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context->nsc_stream.PlaneByteCount[i] = planesize;
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}
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}
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void nsc_compose_message(NSC_CONTEXT* context, STREAM* s,
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uint8* bmpdata, int width, int height, int rowstride)
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{
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int i;
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context->width = width;
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context->height = height;
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nsc_context_initialize_encode(context);
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/* ARGB to AYCoCg conversion, chroma subsampling and colorloss reduction */
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PROFILER_ENTER(context->priv->prof_nsc_encode);
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context->encode(context, bmpdata, rowstride);
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PROFILER_EXIT(context->priv->prof_nsc_encode);
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/* RLE encode */
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PROFILER_ENTER(context->priv->prof_nsc_rle_compress_data);
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nsc_rle_compress_data(context);
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PROFILER_EXIT(context->priv->prof_nsc_rle_compress_data);
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/* Assemble the NSCodec message into stream */
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stream_check_size(s, 20);
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stream_write_uint32(s, context->nsc_stream.PlaneByteCount[0]); /* LumaPlaneByteCount (4 bytes) */
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stream_write_uint32(s, context->nsc_stream.PlaneByteCount[1]); /* OrangeChromaPlaneByteCount (4 bytes) */
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stream_write_uint32(s, context->nsc_stream.PlaneByteCount[2]); /* GreenChromaPlaneByteCount (4 bytes) */
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stream_write_uint32(s, context->nsc_stream.PlaneByteCount[3]); /* AlphaPlaneByteCount (4 bytes) */
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stream_write_uint8(s, context->nsc_stream.ColorLossLevel); /* ColorLossLevel (1 byte) */
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stream_write_uint8(s, context->nsc_stream.ChromaSubSamplingLevel); /* ChromaSubsamplingLevel (1 byte) */
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stream_write_uint16(s, 0); /* Reserved (2 bytes) */
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for (i = 0; i < 4; i++)
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{
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if (context->nsc_stream.PlaneByteCount[i] > 0)
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{
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stream_check_size(s, (int) context->nsc_stream.PlaneByteCount[i]);
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stream_write(s, context->priv->plane_buf[i], context->nsc_stream.PlaneByteCount[i]);
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}
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}
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}
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