mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 15356 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Kostya Shishkov
17 years ago
parent
f7e5b0cc8f
commit
44aa9771c9
6 changed files with 309 additions and 387 deletions
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/*
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* Micrsoft RLE Decoder |
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* Copyright (C) 2008 Konstantin Shishkov |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file msrledec.c |
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* MS RLE Decoder based on decoder by Mike Melanson and my own for TSCC |
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* For more information about the MS RLE format, visit: |
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* http://www.multimedia.cx/msrle.txt
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*/ |
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#include "avcodec.h" |
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#define FETCH_NEXT_STREAM_BYTE() \ |
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if (stream_ptr >= data_size) \
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{ \
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av_log(avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (1)\n"); \
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return -1; \
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} \
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stream_byte = data[stream_ptr++]; |
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static int msrle_decode_pal4(AVCodecContext *avctx, AVPicture *pic, |
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const uint8_t *data, int data_size) |
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{ |
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int stream_ptr = 0; |
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unsigned char rle_code; |
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unsigned char extra_byte, odd_pixel; |
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unsigned char stream_byte; |
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int pixel_ptr = 0; |
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int row_dec = pic->linesize[0]; |
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int row_ptr = (avctx->height - 1) * row_dec; |
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int frame_size = row_dec * avctx->height; |
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int i; |
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while (row_ptr >= 0) { |
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FETCH_NEXT_STREAM_BYTE(); |
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rle_code = stream_byte; |
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if (rle_code == 0) { |
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/* fetch the next byte to see how to handle escape code */ |
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FETCH_NEXT_STREAM_BYTE(); |
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if (stream_byte == 0) { |
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/* line is done, goto the next one */ |
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row_ptr -= row_dec; |
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pixel_ptr = 0; |
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} else if (stream_byte == 1) { |
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/* decode is done */ |
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return 0; |
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} else if (stream_byte == 2) { |
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/* reposition frame decode coordinates */ |
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FETCH_NEXT_STREAM_BYTE(); |
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pixel_ptr += stream_byte; |
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FETCH_NEXT_STREAM_BYTE(); |
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row_ptr -= stream_byte * row_dec; |
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} else { |
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// copy pixels from encoded stream
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odd_pixel = stream_byte & 1; |
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rle_code = (stream_byte + 1) / 2; |
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extra_byte = rle_code & 0x01; |
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if ((row_ptr + pixel_ptr + stream_byte > frame_size) || |
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(row_ptr < 0)) { |
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av_log(avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n"); |
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return -1; |
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} |
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for (i = 0; i < rle_code; i++) { |
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if (pixel_ptr >= avctx->width) |
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break; |
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FETCH_NEXT_STREAM_BYTE(); |
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pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4; |
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pixel_ptr++; |
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if (i + 1 == rle_code && odd_pixel) |
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break; |
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if (pixel_ptr >= avctx->width) |
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break; |
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pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F; |
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pixel_ptr++; |
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} |
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// if the RLE code is odd, skip a byte in the stream
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if (extra_byte) |
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stream_ptr++; |
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} |
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} else { |
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// decode a run of data
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if ((row_ptr + pixel_ptr + stream_byte > frame_size) || |
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(row_ptr < 0)) { |
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av_log(avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n"); |
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return -1; |
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} |
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FETCH_NEXT_STREAM_BYTE(); |
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for (i = 0; i < rle_code; i++) { |
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if (pixel_ptr >= avctx->width) |
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break; |
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if ((i & 1) == 0) |
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pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4; |
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else |
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pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F; |
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pixel_ptr++; |
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} |
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} |
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} |
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/* one last sanity check on the way out */ |
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if (stream_ptr < data_size) { |
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av_log(avctx, AV_LOG_ERROR, " MS RLE: ended frame decode with bytes left over (%d < %d)\n", |
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stream_ptr, data_size); |
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return -1; |
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} |
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return 0; |
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} |
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static int msrle_decode_8_16_24_32(AVCodecContext *avctx, AVPicture *pic, int depth, |
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const uint8_t *data, int srcsize) |
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{ |
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uint8_t *output, *output_end; |
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const uint8_t* src = data; |
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int p1, p2, line=avctx->height, pos=0, i; |
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uint16_t pix16; |
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uint32_t pix32; |
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output = pic->data[0] + (avctx->height - 1) * pic->linesize[0]; |
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output_end = pic->data[0] + (avctx->height) * pic->linesize[0]; |
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while(src < data + srcsize) { |
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p1 = *src++; |
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if(p1 == 0) { //Escape code
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p2 = *src++; |
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if(p2 == 0) { //End-of-line
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output = pic->data[0] + (--line) * pic->linesize[0]; |
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if (line < 0) |
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return -1; |
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pos = 0; |
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continue; |
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} else if(p2 == 1) { //End-of-picture
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return 0; |
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} else if(p2 == 2) { //Skip
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p1 = *src++; |
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p2 = *src++; |
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line -= p2; |
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if (line < 0) |
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return -1; |
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pos += p1; |
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output = pic->data[0] + line * pic->linesize[0] + pos * (depth >> 3); |
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continue; |
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} |
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// Copy data
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if (output + p2 * (depth >> 3) > output_end) { |
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src += p2 * (depth >> 3); |
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continue; |
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} |
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if ((depth == 8) || (depth == 24)) { |
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for(i = 0; i < p2 * (depth >> 3); i++) { |
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*output++ = *src++; |
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} |
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// RLE8 copy is actually padded - and runs are not!
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if(depth == 8 && (p2 & 1)) { |
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src++; |
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} |
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} else if (depth == 16) { |
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for(i = 0; i < p2; i++) { |
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pix16 = AV_RL16(src); |
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src += 2; |
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*(uint16_t*)output = pix16; |
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output += 2; |
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} |
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} else if (depth == 32) { |
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for(i = 0; i < p2; i++) { |
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pix32 = AV_RL32(src); |
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src += 4; |
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*(uint32_t*)output = pix32; |
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output += 4; |
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} |
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} |
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pos += p2; |
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} else { //Run of pixels
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int pix[4]; //original pixel
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switch(depth){ |
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case 8: pix[0] = *src++; |
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break; |
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case 16: pix16 = AV_RL16(src); |
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src += 2; |
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*(uint16_t*)pix = pix16; |
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break; |
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case 24: pix[0] = *src++; |
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pix[1] = *src++; |
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pix[2] = *src++; |
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break; |
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case 32: pix32 = AV_RL32(src); |
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src += 4; |
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*(uint32_t*)pix = pix32; |
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break; |
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} |
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if (output + p1 * (depth >> 3) > output_end) |
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continue; |
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for(i = 0; i < p1; i++) { |
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switch(depth){ |
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case 8: *output++ = pix[0]; |
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break; |
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case 16: *(uint16_t*)output = pix16; |
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output += 2; |
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break; |
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case 24: *output++ = pix[0]; |
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*output++ = pix[1]; |
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*output++ = pix[2]; |
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break; |
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case 32: *(uint32_t*)output = pix32; |
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output += 4; |
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break; |
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} |
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} |
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pos += p1; |
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} |
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} |
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av_log(avctx, AV_LOG_WARNING, "MS RLE warning: no End-of-picture code\n"); |
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return 0; |
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} |
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int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic, int depth, |
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const uint8_t* data, int data_size) |
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{ |
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switch(depth){ |
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case 4: |
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return msrle_decode_pal4(avctx, pic, data, data_size); |
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case 8: |
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case 16: |
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case 24: |
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case 32: |
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return msrle_decode_8_16_24_32(avctx, pic, depth, data, data_size); |
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default: |
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av_log(avctx, AV_LOG_ERROR, "Unknown depth %d\n", depth); |
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return -1; |
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} |
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} |
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@ -0,0 +1,40 @@ |
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/*
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* Micrsoft RLE Decoder |
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* Copyright (C) 2008 Konstantin Shishkov |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_MSRLEDEC_H |
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#define AVCODEC_MSRLEDEC_H |
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#include "avcodec.h" |
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/**
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* decode stream in MS RLE format into frame |
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* |
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* @param avctx codec context |
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* @param pic destination frame |
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* @param depth bit depth |
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* @param data input stream |
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* @param data_size input size |
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*/ |
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int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic, int depth, |
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const uint8_t* data, int data_size); |
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#endif /* AVCODEC_MSRLEDEC_H */ |
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