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Diffstat (limited to 'ffmpeg1/libavcodec/msrledec.c')
-rw-r--r--ffmpeg1/libavcodec/msrledec.c266
1 files changed, 0 insertions, 266 deletions
diff --git a/ffmpeg1/libavcodec/msrledec.c b/ffmpeg1/libavcodec/msrledec.c
deleted file mode 100644
index 83d7d13..0000000
--- a/ffmpeg1/libavcodec/msrledec.c
+++ /dev/null
@@ -1,266 +0,0 @@
-/*
- * Microsoft RLE decoder
- * Copyright (C) 2008 Konstantin Shishkov
- *
- * 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
- */
-
-/**
- * @file
- * MS RLE decoder based on decoder by Mike Melanson and my own for TSCC
- * For more information about the MS RLE format, visit:
- * http://www.multimedia.cx/msrle.txt
- */
-
-#include "libavutil/intreadwrite.h"
-#include "avcodec.h"
-#include "msrledec.h"
-
-static int msrle_decode_pal4(AVCodecContext *avctx, AVPicture *pic,
- GetByteContext *gb)
-{
- unsigned char rle_code;
- unsigned char extra_byte, odd_pixel;
- unsigned char stream_byte;
- unsigned int pixel_ptr = 0;
- int row_dec = pic->linesize[0];
- int row_ptr = (avctx->height - 1) * row_dec;
- int frame_size = row_dec * avctx->height;
- int i;
-
- while (row_ptr >= 0) {
- if (bytestream2_get_bytes_left(gb) <= 0) {
- av_log(avctx, AV_LOG_ERROR,
- "MS RLE: bytestream overrun, %d rows left\n",
- row_ptr);
- return AVERROR_INVALIDDATA;
- }
- rle_code = stream_byte = bytestream2_get_byteu(gb);
- if (rle_code == 0) {
- /* fetch the next byte to see how to handle escape code */
- stream_byte = bytestream2_get_byte(gb);
- if (stream_byte == 0) {
- /* line is done, goto the next one */
- row_ptr -= row_dec;
- pixel_ptr = 0;
- } else if (stream_byte == 1) {
- /* decode is done */
- return 0;
- } else if (stream_byte == 2) {
- /* reposition frame decode coordinates */
- stream_byte = bytestream2_get_byte(gb);
- pixel_ptr += stream_byte;
- stream_byte = bytestream2_get_byte(gb);
- row_ptr -= stream_byte * row_dec;
- } else {
- // copy pixels from encoded stream
- odd_pixel = stream_byte & 1;
- rle_code = (stream_byte + 1) / 2;
- extra_byte = rle_code & 0x01;
- if (row_ptr + pixel_ptr + stream_byte > frame_size ||
- bytestream2_get_bytes_left(gb) < rle_code) {
- av_log(avctx, AV_LOG_ERROR,
- "MS RLE: frame/stream ptr just went out of bounds (copy)\n");
- return AVERROR_INVALIDDATA;
- }
-
- for (i = 0; i < rle_code; i++) {
- if (pixel_ptr >= avctx->width)
- break;
- stream_byte = bytestream2_get_byteu(gb);
- pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
- pixel_ptr++;
- if (i + 1 == rle_code && odd_pixel)
- break;
- if (pixel_ptr >= avctx->width)
- break;
- pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
- pixel_ptr++;
- }
-
- // if the RLE code is odd, skip a byte in the stream
- if (extra_byte)
- bytestream2_skip(gb, 1);
- }
- } else {
- // decode a run of data
- if (row_ptr + pixel_ptr + stream_byte > frame_size) {
- av_log(avctx, AV_LOG_ERROR,
- "MS RLE: frame ptr just went out of bounds (run)\n");
- return AVERROR_INVALIDDATA;
- }
- stream_byte = bytestream2_get_byte(gb);
- for (i = 0; i < rle_code; i++) {
- if (pixel_ptr >= avctx->width)
- break;
- if ((i & 1) == 0)
- pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
- else
- pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
- pixel_ptr++;
- }
- }
- }
-
- /* one last sanity check on the way out */
- if (bytestream2_get_bytes_left(gb)) {
- av_log(avctx, AV_LOG_ERROR,
- "MS RLE: ended frame decode with %d bytes left over\n",
- bytestream2_get_bytes_left(gb));
- return AVERROR_INVALIDDATA;
- }
-
- return 0;
-}
-
-
-static int msrle_decode_8_16_24_32(AVCodecContext *avctx, AVPicture *pic,
- int depth, GetByteContext *gb)
-{
- uint8_t *output, *output_end;
- int p1, p2, line=avctx->height - 1, pos=0, i;
- uint16_t pix16;
- uint32_t pix32;
- unsigned int width= FFABS(pic->linesize[0]) / (depth >> 3);
-
- output = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
- output_end = output + FFABS(pic->linesize[0]);
-
- while (bytestream2_get_bytes_left(gb) > 0) {
- p1 = bytestream2_get_byteu(gb);
- if(p1 == 0) { //Escape code
- p2 = bytestream2_get_byte(gb);
- if(p2 == 0) { //End-of-line
- if (--line < 0) {
- if (bytestream2_get_be16(gb) == 1) { // end-of-picture
- return 0;
- } else {
- av_log(avctx, AV_LOG_ERROR,
- "Next line is beyond picture bounds (%d bytes left)\n",
- bytestream2_get_bytes_left(gb));
- return AVERROR_INVALIDDATA;
- }
- }
- output = pic->data[0] + line * pic->linesize[0];
- output_end = output + FFABS(pic->linesize[0]);
- pos = 0;
- continue;
- } else if(p2 == 1) { //End-of-picture
- return 0;
- } else if(p2 == 2) { //Skip
- p1 = bytestream2_get_byte(gb);
- p2 = bytestream2_get_byte(gb);
- line -= p2;
- pos += p1;
- if (line < 0 || pos >= width){
- av_log(avctx, AV_LOG_ERROR, "Skip beyond picture bounds\n");
- return -1;
- }
- output = pic->data[0] + line * pic->linesize[0] + pos * (depth >> 3);
- output_end = pic->data[0] + line * pic->linesize[0] + FFABS(pic->linesize[0]);
- continue;
- }
- // Copy data
- if (output + p2 * (depth >> 3) > output_end) {
- bytestream2_skip(gb, 2 * (depth >> 3));
- continue;
- } else if (bytestream2_get_bytes_left(gb) < p2 * (depth >> 3)) {
- av_log(avctx, AV_LOG_ERROR, "bytestream overrun\n");
- return AVERROR_INVALIDDATA;
- }
-
- if ((depth == 8) || (depth == 24)) {
- for(i = 0; i < p2 * (depth >> 3); i++) {
- *output++ = bytestream2_get_byteu(gb);
- }
- // RLE8 copy is actually padded - and runs are not!
- if(depth == 8 && (p2 & 1)) {
- bytestream2_skip(gb, 1);
- }
- } else if (depth == 16) {
- for(i = 0; i < p2; i++) {
- *(uint16_t*)output = bytestream2_get_le16u(gb);
- output += 2;
- }
- } else if (depth == 32) {
- for(i = 0; i < p2; i++) {
- *(uint32_t*)output = bytestream2_get_le32u(gb);
- output += 4;
- }
- }
- pos += p2;
- } else { //run of pixels
- uint8_t pix[3]; //original pixel
- if (output + p1 * (depth >> 3) > output_end)
- continue;
-
- switch(depth){
- case 8:
- pix[0] = bytestream2_get_byte(gb);
- for(i = 0; i < p1; i++)
- *output++ = pix[0];
- break;
- case 16:
- pix16 = bytestream2_get_le16(gb);
- for(i = 0; i < p1; i++) {
- *(uint16_t*)output = pix16;
- output += 2;
- }
- break;
- case 24:
- pix[0] = bytestream2_get_byte(gb);
- pix[1] = bytestream2_get_byte(gb);
- pix[2] = bytestream2_get_byte(gb);
- for(i = 0; i < p1; i++) {
- *output++ = pix[0];
- *output++ = pix[1];
- *output++ = pix[2];
- }
- break;
- case 32:
- pix32 = bytestream2_get_le32(gb);
- for(i = 0; i < p1; i++) {
- *(uint32_t*)output = pix32;
- output += 4;
- }
- break;
- }
- pos += p1;
- }
- }
-
- av_log(avctx, AV_LOG_WARNING, "MS RLE warning: no end-of-picture code\n");
- return 0;
-}
-
-
-int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic,
- int depth, GetByteContext *gb)
-{
- switch(depth){
- case 4:
- return msrle_decode_pal4(avctx, pic, gb);
- case 8:
- case 16:
- case 24:
- case 32:
- return msrle_decode_8_16_24_32(avctx, pic, depth, gb);
- default:
- av_log(avctx, AV_LOG_ERROR, "Unknown depth %d\n", depth);
- return -1;
- }
-}
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