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![Mike Melanson](/assets/img/avatar_default.png)
Video-1, Apple RPZA, Cinepak, Westwood IMA ADPCM Originally committed as revision 2324 to svn://svn.ffmpeg.org/ffmpeg/trunk
220 lines
6.3 KiB
C
220 lines
6.3 KiB
C
/*
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* Micrsoft RLE Video Decoder
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* Copyright (C) 2003 the ffmpeg project
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file msrle.c
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* MS RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
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* For more information about the MS RLE format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*
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* The MS RLE decoder outputs PAL8 colorspace data.
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*
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* Note that this decoder expects the palette colors from the end of the
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* BITMAPINFO header passed through extradata.
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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 <unistd.h>
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#include "common.h"
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#include "avcodec.h"
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#include "dsputil.h"
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typedef struct MsrleContext {
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AVCodecContext *avctx;
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AVFrame frame;
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AVFrame prev_frame;
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unsigned char *buf;
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int size;
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unsigned int palette[256];
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} MsrleContext;
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#define FETCH_NEXT_STREAM_BYTE() \
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if (stream_ptr >= s->size) \
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{ \
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printf(" MS RLE: stream ptr just went out of bounds (1)\n"); \
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return; \
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} \
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stream_byte = s->buf[stream_ptr++];
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static void msrle_decode_pal8(MsrleContext *s)
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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;
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unsigned char stream_byte;
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int pixel_ptr = 0;
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int row_dec = s->frame.linesize[0];
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int row_ptr = (s->avctx->height - 1) * row_dec;
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int frame_size = row_dec * s->avctx->height;
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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;
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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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if ((row_ptr + pixel_ptr + stream_byte > frame_size) ||
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(row_ptr < 0)) {
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printf(" MS RLE: frame ptr just went out of bounds (1)\n");
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return;
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}
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rle_code = stream_byte;
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extra_byte = stream_byte & 0x01;
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if (stream_ptr + rle_code + extra_byte > s->size) {
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printf(" MS RLE: stream ptr just went out of bounds (2)\n");
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return;
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}
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while (rle_code--) {
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FETCH_NEXT_STREAM_BYTE();
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s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
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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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printf(" MS RLE: frame ptr just went out of bounds (2)\n");
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return;
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}
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FETCH_NEXT_STREAM_BYTE();
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while(rle_code--) {
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s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
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pixel_ptr++;
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}
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}
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}
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/* make the palette available */
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memcpy(s->frame.data[1], s->palette, 256 * 4);
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/* one last sanity check on the way out */
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if (stream_ptr < s->size)
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printf(" MS RLE: ended frame decode with bytes left over (%d < %d)\n",
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stream_ptr, s->size);
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}
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static int msrle_decode_init(AVCodecContext *avctx)
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{
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MsrleContext *s = (MsrleContext *)avctx->priv_data;
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int i, j;
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unsigned char *palette;
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s->avctx = avctx;
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avctx->pix_fmt = PIX_FMT_PAL8;
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avctx->has_b_frames = 0;
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s->frame.data[0] = s->prev_frame.data[0] = NULL;
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/* convert palette */
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palette = (unsigned char *)s->avctx->extradata;
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memset (s->palette, 0, 256 * 4);
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for (i = 0, j = 0; i < s->avctx->extradata_size / 4; i++, j += 4)
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s->palette[i] =
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(palette[j + 2] << 16) |
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(palette[j + 1] << 8) |
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(palette[j + 0] << 0);
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return 0;
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}
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static int msrle_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf, int buf_size)
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{
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MsrleContext *s = (MsrleContext *)avctx->priv_data;
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s->buf = buf;
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s->size = buf_size;
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if (avctx->get_buffer(avctx, &s->frame)) {
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printf (" MS RLE: get_buffer() failed\n");
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return -1;
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}
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/* grossly inefficient, but...oh well */
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memcpy(s->frame.data[0], s->prev_frame.data[0],
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s->frame.linesize[0] * s->avctx->height);
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msrle_decode_pal8(s);
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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/* shuffle frames */
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s->prev_frame = s->frame;
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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/* report that the buffer was completely consumed */
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return buf_size;
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}
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static int msrle_decode_end(AVCodecContext *avctx)
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{
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MsrleContext *s = (MsrleContext *)avctx->priv_data;
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/* release the last frame */
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if (s->prev_frame.data[0])
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avctx->release_buffer(avctx, &s->prev_frame);
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return 0;
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}
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AVCodec msrle_decoder = {
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"msrle",
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CODEC_TYPE_VIDEO,
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CODEC_ID_MSRLE,
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sizeof(MsrleContext),
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msrle_decode_init,
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NULL,
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msrle_decode_end,
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msrle_decode_frame,
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CODEC_CAP_DR1,
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};
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