mirror of
https://github.com/FFmpeg/FFmpeg.git
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587d07227e
patch by Nicholas Tung, ntung ntung com Originally committed as revision 8647 to svn://svn.ffmpeg.org/ffmpeg/trunk
964 lines
28 KiB
C
964 lines
28 KiB
C
/*
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* Interplay MVE Video Decoder
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* Copyright (C) 2003 the ffmpeg project
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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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/**
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* @file interplayvideo.c
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* Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net)
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* For more information about the Interplay MVE format, visit:
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* http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
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* This code is written in such a way that the identifiers match up
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* with the encoding descriptions in the document.
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*
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* This decoder presently only supports a PAL8 output colorspace.
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*
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* An Interplay video frame consists of 2 parts: The decoding map and
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* the video data. A demuxer must load these 2 parts together in a single
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* buffer before sending it through the stream to this decoder.
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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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#define PALETTE_COUNT 256
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/* debugging support */
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#define DEBUG_INTERPLAY 0
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#if DEBUG_INTERPLAY
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#define debug_interplay(x,...) av_log(NULL, AV_LOG_DEBUG, x, __VA_ARGS__)
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#else
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static inline void debug_interplay(const char *format, ...) { }
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#endif
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typedef struct IpvideoContext {
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AVCodecContext *avctx;
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DSPContext dsp;
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AVFrame second_last_frame;
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AVFrame last_frame;
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AVFrame current_frame;
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unsigned char *decoding_map;
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int decoding_map_size;
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unsigned char *buf;
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int size;
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unsigned char *stream_ptr;
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unsigned char *stream_end;
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unsigned char *pixel_ptr;
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int line_inc;
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int stride;
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int upper_motion_limit_offset;
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} IpvideoContext;
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#define CHECK_STREAM_PTR(n) \
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if ((s->stream_ptr + n) > s->stream_end) { \
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av_log(s->avctx, AV_LOG_ERROR, "Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
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s->stream_ptr + n, s->stream_end); \
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return -1; \
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}
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#define COPY_FROM_CURRENT() \
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motion_offset = current_offset; \
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motion_offset += y * s->stride; \
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motion_offset += x; \
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if (motion_offset < 0) { \
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av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
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return -1; \
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} else if (motion_offset > s->upper_motion_limit_offset) { \
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av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
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motion_offset, s->upper_motion_limit_offset); \
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return -1; \
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} \
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s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
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s->current_frame.data[0] + motion_offset, s->stride, 8);
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#define COPY_FROM_PREVIOUS() \
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motion_offset = current_offset; \
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motion_offset += y * s->stride; \
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motion_offset += x; \
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if (motion_offset < 0) { \
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av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
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return -1; \
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} else if (motion_offset > s->upper_motion_limit_offset) { \
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av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
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motion_offset, s->upper_motion_limit_offset); \
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return -1; \
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} \
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s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
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s->last_frame.data[0] + motion_offset, s->stride, 8);
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#define COPY_FROM_SECOND_LAST() \
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motion_offset = current_offset; \
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motion_offset += y * s->stride; \
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motion_offset += x; \
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if (motion_offset < 0) { \
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av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
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return -1; \
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} else if (motion_offset > s->upper_motion_limit_offset) { \
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av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
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motion_offset, s->upper_motion_limit_offset); \
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return -1; \
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} \
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s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
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s->second_last_frame.data[0] + motion_offset, s->stride, 8);
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static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s)
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{
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int x, y;
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int motion_offset;
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int current_offset = s->pixel_ptr - s->current_frame.data[0];
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/* copy a block from the previous frame */
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x = y = 0;
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COPY_FROM_PREVIOUS();
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s)
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{
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int x, y;
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int motion_offset;
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int current_offset = s->pixel_ptr - s->current_frame.data[0];
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/* copy block from 2 frames ago */
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x = y = 0;
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COPY_FROM_SECOND_LAST();
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s)
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{
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unsigned char B;
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int x, y;
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int motion_offset;
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int current_offset = s->pixel_ptr - s->current_frame.data[0];
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/* copy block from 2 frames ago using a motion vector; need 1 more byte */
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CHECK_STREAM_PTR(1);
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B = *s->stream_ptr++;
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if (B < 56) {
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x = 8 + (B % 7);
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y = B / 7;
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} else {
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x = -14 + ((B - 56) % 29);
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y = 8 + ((B - 56) / 29);
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}
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debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
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COPY_FROM_SECOND_LAST();
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s)
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{
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unsigned char B;
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int x, y;
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int motion_offset;
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int current_offset = s->pixel_ptr - s->current_frame.data[0];
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/* copy 8x8 block from current frame from an up/left block */
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/* need 1 more byte for motion */
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CHECK_STREAM_PTR(1);
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B = *s->stream_ptr++;
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if (B < 56) {
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x = -(8 + (B % 7));
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y = -(B / 7);
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} else {
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x = -(-14 + ((B - 56) % 29));
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y = -( 8 + ((B - 56) / 29));
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}
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debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
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COPY_FROM_CURRENT();
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s)
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{
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int x, y;
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unsigned char B, BL, BH;
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int motion_offset;
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int current_offset = s->pixel_ptr - s->current_frame.data[0];
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/* copy a block from the previous frame; need 1 more byte */
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CHECK_STREAM_PTR(1);
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B = *s->stream_ptr++;
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BL = B & 0x0F;
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BH = (B >> 4) & 0x0F;
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x = -8 + BL;
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y = -8 + BH;
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debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
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COPY_FROM_PREVIOUS();
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s)
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{
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signed char x, y;
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int motion_offset;
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int current_offset = s->pixel_ptr - s->current_frame.data[0];
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/* copy a block from the previous frame using an expanded range;
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* need 2 more bytes */
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CHECK_STREAM_PTR(2);
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x = *s->stream_ptr++;
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y = *s->stream_ptr++;
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debug_interplay (" motion bytes = %d, %d\n", x, y);
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COPY_FROM_PREVIOUS();
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s)
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{
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/* mystery opcode? skip multiple blocks? */
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av_log(s->avctx, AV_LOG_ERROR, " Interplay video: Help! Mystery opcode 0x6 seen\n");
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
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{
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int x, y;
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unsigned char P0, P1;
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unsigned char B[8];
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unsigned int flags;
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int bitmask;
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/* 2-color encoding */
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CHECK_STREAM_PTR(2);
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P0 = *s->stream_ptr++;
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P1 = *s->stream_ptr++;
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if (P0 <= P1) {
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/* need 8 more bytes from the stream */
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CHECK_STREAM_PTR(8);
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for (y = 0; y < 8; y++)
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B[y] = *s->stream_ptr++;
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for (y = 0; y < 8; y++) {
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flags = B[y];
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for (x = 0x01; x <= 0x80; x <<= 1) {
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if (flags & x)
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*s->pixel_ptr++ = P1;
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else
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*s->pixel_ptr++ = P0;
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}
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s->pixel_ptr += s->line_inc;
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}
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} else {
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/* need 2 more bytes from the stream */
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CHECK_STREAM_PTR(2);
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B[0] = *s->stream_ptr++;
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B[1] = *s->stream_ptr++;
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flags = (B[1] << 8) | B[0];
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bitmask = 0x0001;
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for (y = 0; y < 8; y += 2) {
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for (x = 0; x < 8; x += 2, bitmask <<= 1) {
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if (flags & bitmask) {
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*(s->pixel_ptr + x) = P1;
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*(s->pixel_ptr + x + 1) = P1;
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*(s->pixel_ptr + s->stride + x) = P1;
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*(s->pixel_ptr + s->stride + x + 1) = P1;
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} else {
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*(s->pixel_ptr + x) = P0;
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*(s->pixel_ptr + x + 1) = P0;
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*(s->pixel_ptr + s->stride + x) = P0;
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*(s->pixel_ptr + s->stride + x + 1) = P0;
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}
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}
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s->pixel_ptr += s->stride * 2;
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}
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}
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
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{
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int x, y;
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unsigned char P[8];
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unsigned char B[8];
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unsigned int flags = 0;
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unsigned int bitmask = 0;
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unsigned char P0 = 0, P1 = 0;
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int lower_half = 0;
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/* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
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* either top and bottom or left and right halves */
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CHECK_STREAM_PTR(2);
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P[0] = *s->stream_ptr++;
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P[1] = *s->stream_ptr++;
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if (P[0] <= P[1]) {
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/* need 12 more bytes */
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CHECK_STREAM_PTR(12);
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B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
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P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
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B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
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P[4] = *s->stream_ptr++; P[5] = *s->stream_ptr++;
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B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
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P[6] = *s->stream_ptr++; P[7] = *s->stream_ptr++;
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B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
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for (y = 0; y < 8; y++) {
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/* time to reload flags? */
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if (y == 0) {
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flags =
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((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
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((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
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((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
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((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
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bitmask = 0x00000001;
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lower_half = 0; /* still on top half */
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} else if (y == 4) {
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flags =
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((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
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((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
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((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
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((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
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bitmask = 0x00000001;
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lower_half = 2;
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}
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for (x = 0; x < 8; x++, bitmask <<= 1) {
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/* get the pixel values ready for this quadrant */
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if (x == 0) {
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P0 = P[lower_half + 0];
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P1 = P[lower_half + 1];
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} else if (x == 4) {
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P0 = P[lower_half + 4];
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P1 = P[lower_half + 5];
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}
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if (flags & bitmask)
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*s->pixel_ptr++ = P1;
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else
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*s->pixel_ptr++ = P0;
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}
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s->pixel_ptr += s->line_inc;
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}
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} else {
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/* need 10 more bytes */
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CHECK_STREAM_PTR(10);
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B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
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B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
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P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
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B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
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B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
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if (P[2] <= P[3]) {
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/* vertical split; left & right halves are 2-color encoded */
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for (y = 0; y < 8; y++) {
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/* time to reload flags? */
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if (y == 0) {
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flags =
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((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
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((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
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((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
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((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
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bitmask = 0x00000001;
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} else if (y == 4) {
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flags =
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((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
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((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
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((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
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((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
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bitmask = 0x00000001;
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}
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for (x = 0; x < 8; x++, bitmask <<= 1) {
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/* get the pixel values ready for this half */
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if (x == 0) {
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P0 = P[0];
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P1 = P[1];
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} else if (x == 4) {
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P0 = P[2];
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P1 = P[3];
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}
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if (flags & bitmask)
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*s->pixel_ptr++ = P1;
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else
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*s->pixel_ptr++ = P0;
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}
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s->pixel_ptr += s->line_inc;
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}
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} else {
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/* horizontal split; top & bottom halves are 2-color encoded */
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for (y = 0; y < 8; y++) {
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flags = B[y];
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if (y == 0) {
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P0 = P[0];
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P1 = P[1];
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} else if (y == 4) {
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P0 = P[2];
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P1 = P[3];
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}
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for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {
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if (flags & bitmask)
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*s->pixel_ptr++ = P1;
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else
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*s->pixel_ptr++ = P0;
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}
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s->pixel_ptr += s->line_inc;
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}
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}
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}
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/* report success */
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return 0;
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}
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static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
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{
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int x, y;
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unsigned char P[4];
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unsigned char B[4];
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unsigned int flags = 0;
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int shifter = 0;
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unsigned char pix;
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/* 4-color encoding */
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CHECK_STREAM_PTR(4);
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for (y = 0; y < 4; y++)
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P[y] = *s->stream_ptr++;
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|
|
if ((P[0] <= P[1]) && (P[2] <= P[3])) {
|
|
|
|
/* 1 of 4 colors for each pixel, need 16 more bytes */
|
|
CHECK_STREAM_PTR(16);
|
|
|
|
for (y = 0; y < 8; y++) {
|
|
/* get the next set of 8 2-bit flags */
|
|
flags = (s->stream_ptr[1] << 8) | s->stream_ptr[0];
|
|
s->stream_ptr += 2;
|
|
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
|
|
*s->pixel_ptr++ = P[(flags >> shifter) & 0x03];
|
|
}
|
|
s->pixel_ptr += s->line_inc;
|
|
}
|
|
|
|
} else if ((P[0] <= P[1]) && (P[2] > P[3])) {
|
|
|
|
/* 1 of 4 colors for each 2x2 block, need 4 more bytes */
|
|
CHECK_STREAM_PTR(4);
|
|
|
|
B[0] = *s->stream_ptr++;
|
|
B[1] = *s->stream_ptr++;
|
|
B[2] = *s->stream_ptr++;
|
|
B[3] = *s->stream_ptr++;
|
|
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
|
|
shifter = 0;
|
|
|
|
for (y = 0; y < 8; y += 2) {
|
|
for (x = 0; x < 8; x += 2, shifter += 2) {
|
|
pix = P[(flags >> shifter) & 0x03];
|
|
*(s->pixel_ptr + x) = pix;
|
|
*(s->pixel_ptr + x + 1) = pix;
|
|
*(s->pixel_ptr + s->stride + x) = pix;
|
|
*(s->pixel_ptr + s->stride + x + 1) = pix;
|
|
}
|
|
s->pixel_ptr += s->stride * 2;
|
|
}
|
|
|
|
} else if ((P[0] > P[1]) && (P[2] <= P[3])) {
|
|
|
|
/* 1 of 4 colors for each 2x1 block, need 8 more bytes */
|
|
CHECK_STREAM_PTR(8);
|
|
|
|
for (y = 0; y < 8; y++) {
|
|
/* time to reload flags? */
|
|
if ((y == 0) || (y == 4)) {
|
|
B[0] = *s->stream_ptr++;
|
|
B[1] = *s->stream_ptr++;
|
|
B[2] = *s->stream_ptr++;
|
|
B[3] = *s->stream_ptr++;
|
|
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
|
|
shifter = 0;
|
|
}
|
|
for (x = 0; x < 8; x += 2, shifter += 2) {
|
|
pix = P[(flags >> shifter) & 0x03];
|
|
*(s->pixel_ptr + x) = pix;
|
|
*(s->pixel_ptr + x + 1) = pix;
|
|
}
|
|
s->pixel_ptr += s->stride;
|
|
}
|
|
|
|
} else {
|
|
|
|
/* 1 of 4 colors for each 1x2 block, need 8 more bytes */
|
|
CHECK_STREAM_PTR(8);
|
|
|
|
for (y = 0; y < 8; y += 2) {
|
|
/* time to reload flags? */
|
|
if ((y == 0) || (y == 4)) {
|
|
B[0] = *s->stream_ptr++;
|
|
B[1] = *s->stream_ptr++;
|
|
B[2] = *s->stream_ptr++;
|
|
B[3] = *s->stream_ptr++;
|
|
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
|
|
shifter = 0;
|
|
}
|
|
for (x = 0; x < 8; x++, shifter += 2) {
|
|
pix = P[(flags >> shifter) & 0x03];
|
|
*(s->pixel_ptr + x) = pix;
|
|
*(s->pixel_ptr + s->stride + x) = pix;
|
|
}
|
|
s->pixel_ptr += s->stride * 2;
|
|
}
|
|
}
|
|
|
|
/* report success */
|
|
return 0;
|
|
}
|
|
|
|
static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
|
|
{
|
|
int x, y;
|
|
unsigned char P[16];
|
|
unsigned char B[16];
|
|
int flags = 0;
|
|
int shifter = 0;
|
|
int index;
|
|
int split;
|
|
int lower_half;
|
|
|
|
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
|
|
* either top and bottom or left and right halves */
|
|
CHECK_STREAM_PTR(4);
|
|
|
|
for (y = 0; y < 4; y++)
|
|
P[y] = *s->stream_ptr++;
|
|
|
|
if (P[0] <= P[1]) {
|
|
|
|
/* 4-color encoding for each quadrant; need 28 more bytes */
|
|
CHECK_STREAM_PTR(28);
|
|
|
|
for (y = 0; y < 4; y++)
|
|
B[y] = *s->stream_ptr++;
|
|
for (y = 4; y < 16; y += 4) {
|
|
for (x = y; x < y + 4; x++)
|
|
P[x] = *s->stream_ptr++;
|
|
for (x = y; x < y + 4; x++)
|
|
B[x] = *s->stream_ptr++;
|
|
}
|
|
|
|
for (y = 0; y < 8; y++) {
|
|
|
|
lower_half = (y >= 4) ? 4 : 0;
|
|
flags = (B[y + 8] << 8) | B[y];
|
|
|
|
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
|
|
split = (x >= 4) ? 8 : 0;
|
|
index = split + lower_half + ((flags >> shifter) & 0x03);
|
|
*s->pixel_ptr++ = P[index];
|
|
}
|
|
|
|
s->pixel_ptr += s->line_inc;
|
|
}
|
|
|
|
} else {
|
|
|
|
/* 4-color encoding for either left and right or top and bottom
|
|
* halves; need 20 more bytes */
|
|
CHECK_STREAM_PTR(20);
|
|
|
|
for (y = 0; y < 8; y++)
|
|
B[y] = *s->stream_ptr++;
|
|
for (y = 4; y < 8; y++)
|
|
P[y] = *s->stream_ptr++;
|
|
for (y = 8; y < 16; y++)
|
|
B[y] = *s->stream_ptr++;
|
|
|
|
if (P[4] <= P[5]) {
|
|
|
|
/* block is divided into left and right halves */
|
|
for (y = 0; y < 8; y++) {
|
|
|
|
flags = (B[y + 8] << 8) | B[y];
|
|
split = 0;
|
|
|
|
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
|
|
if (x == 4)
|
|
split = 4;
|
|
*s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
|
|
}
|
|
|
|
s->pixel_ptr += s->line_inc;
|
|
}
|
|
|
|
} else {
|
|
|
|
/* block is divided into top and bottom halves */
|
|
split = 0;
|
|
for (y = 0; y < 8; y++) {
|
|
|
|
flags = (B[y * 2 + 1] << 8) | B[y * 2];
|
|
if (y == 4)
|
|
split = 4;
|
|
|
|
for (x = 0, shifter = 0; x < 8; x++, shifter += 2)
|
|
*s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
|
|
|
|
s->pixel_ptr += s->line_inc;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* report success */
|
|
return 0;
|
|
}
|
|
|
|
static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s)
|
|
{
|
|
int x, y;
|
|
|
|
/* 64-color encoding (each pixel in block is a different color) */
|
|
CHECK_STREAM_PTR(64);
|
|
|
|
for (y = 0; y < 8; y++) {
|
|
for (x = 0; x < 8; x++) {
|
|
*s->pixel_ptr++ = *s->stream_ptr++;
|
|
}
|
|
s->pixel_ptr += s->line_inc;
|
|
}
|
|
|
|
/* report success */
|
|
return 0;
|
|
}
|
|
|
|
static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s)
|
|
{
|
|
int x, y;
|
|
unsigned char pix;
|
|
|
|
/* 16-color block encoding: each 2x2 block is a different color */
|
|
CHECK_STREAM_PTR(16);
|
|
|
|
for (y = 0; y < 8; y += 2) {
|
|
for (x = 0; x < 8; x += 2) {
|
|
pix = *s->stream_ptr++;
|
|
*(s->pixel_ptr + x) = pix;
|
|
*(s->pixel_ptr + x + 1) = pix;
|
|
*(s->pixel_ptr + s->stride + x) = pix;
|
|
*(s->pixel_ptr + s->stride + x + 1) = pix;
|
|
}
|
|
s->pixel_ptr += s->stride * 2;
|
|
}
|
|
|
|
/* report success */
|
|
return 0;
|
|
}
|
|
|
|
static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s)
|
|
{
|
|
int x, y;
|
|
unsigned char P[4];
|
|
unsigned char index = 0;
|
|
|
|
/* 4-color block encoding: each 4x4 block is a different color */
|
|
CHECK_STREAM_PTR(4);
|
|
|
|
for (y = 0; y < 4; y++)
|
|
P[y] = *s->stream_ptr++;
|
|
|
|
for (y = 0; y < 8; y++) {
|
|
if (y < 4)
|
|
index = 0;
|
|
else
|
|
index = 2;
|
|
|
|
for (x = 0; x < 8; x++) {
|
|
if (x == 4)
|
|
index++;
|
|
*s->pixel_ptr++ = P[index];
|
|
}
|
|
s->pixel_ptr += s->line_inc;
|
|
}
|
|
|
|
/* report success */
|
|
return 0;
|
|
}
|
|
|
|
static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s)
|
|
{
|
|
int x, y;
|
|
unsigned char pix;
|
|
|
|
/* 1-color encoding: the whole block is 1 solid color */
|
|
CHECK_STREAM_PTR(1);
|
|
pix = *s->stream_ptr++;
|
|
|
|
for (y = 0; y < 8; y++) {
|
|
for (x = 0; x < 8; x++) {
|
|
*s->pixel_ptr++ = pix;
|
|
}
|
|
s->pixel_ptr += s->line_inc;
|
|
}
|
|
|
|
/* report success */
|
|
return 0;
|
|
}
|
|
|
|
static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s)
|
|
{
|
|
int x, y;
|
|
unsigned char sample0, sample1;
|
|
|
|
/* dithered encoding */
|
|
CHECK_STREAM_PTR(2);
|
|
sample0 = *s->stream_ptr++;
|
|
sample1 = *s->stream_ptr++;
|
|
|
|
for (y = 0; y < 8; y++) {
|
|
for (x = 0; x < 8; x += 2) {
|
|
if (y & 1) {
|
|
*s->pixel_ptr++ = sample1;
|
|
*s->pixel_ptr++ = sample0;
|
|
} else {
|
|
*s->pixel_ptr++ = sample0;
|
|
*s->pixel_ptr++ = sample1;
|
|
}
|
|
}
|
|
s->pixel_ptr += s->line_inc;
|
|
}
|
|
|
|
/* report success */
|
|
return 0;
|
|
}
|
|
|
|
static int (*ipvideo_decode_block[16])(IpvideoContext *s);
|
|
|
|
static void ipvideo_decode_opcodes(IpvideoContext *s)
|
|
{
|
|
int x, y;
|
|
int index = 0;
|
|
unsigned char opcode;
|
|
int ret;
|
|
int code_counts[16];
|
|
static int frame = 0;
|
|
|
|
debug_interplay("------------------ frame %d\n", frame);
|
|
frame++;
|
|
|
|
for (x = 0; x < 16; x++)
|
|
code_counts[x] = 0;
|
|
|
|
/* this is PAL8, so make the palette available */
|
|
memcpy(s->current_frame.data[1], s->avctx->palctrl->palette, PALETTE_COUNT * 4);
|
|
|
|
s->stride = s->current_frame.linesize[0];
|
|
s->stream_ptr = s->buf + 14; /* data starts 14 bytes in */
|
|
s->stream_end = s->buf + s->size;
|
|
s->line_inc = s->stride - 8;
|
|
s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride
|
|
+ s->avctx->width - 8;
|
|
s->dsp = s->dsp;
|
|
|
|
for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) {
|
|
for (x = y; x < y + s->avctx->width; x += 8) {
|
|
/* bottom nibble first, then top nibble (which makes it
|
|
* hard to use a GetBitcontext) */
|
|
if (index & 1)
|
|
opcode = s->decoding_map[index >> 1] >> 4;
|
|
else
|
|
opcode = s->decoding_map[index >> 1] & 0xF;
|
|
index++;
|
|
|
|
debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
|
|
x - y, y / s->stride, opcode, s->stream_ptr);
|
|
code_counts[opcode]++;
|
|
|
|
s->pixel_ptr = s->current_frame.data[0] + x;
|
|
ret = ipvideo_decode_block[opcode](s);
|
|
if (ret != 0) {
|
|
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
|
|
frame, x - y, y / s->stride);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
if ((s->stream_ptr != s->stream_end) &&
|
|
(s->stream_ptr + 1 != s->stream_end)) {
|
|
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n",
|
|
s->stream_end - s->stream_ptr);
|
|
}
|
|
}
|
|
|
|
static int ipvideo_decode_init(AVCodecContext *avctx)
|
|
{
|
|
IpvideoContext *s = avctx->priv_data;
|
|
|
|
s->avctx = avctx;
|
|
|
|
if (s->avctx->palctrl == NULL) {
|
|
av_log(avctx, AV_LOG_ERROR, " Interplay video: palette expected.\n");
|
|
return -1;
|
|
}
|
|
|
|
avctx->pix_fmt = PIX_FMT_PAL8;
|
|
dsputil_init(&s->dsp, avctx);
|
|
|
|
/* decoding map contains 4 bits of information per 8x8 block */
|
|
s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
|
|
|
|
/* assign block decode functions */
|
|
ipvideo_decode_block[0x0] = ipvideo_decode_block_opcode_0x0;
|
|
ipvideo_decode_block[0x1] = ipvideo_decode_block_opcode_0x1;
|
|
ipvideo_decode_block[0x2] = ipvideo_decode_block_opcode_0x2;
|
|
ipvideo_decode_block[0x3] = ipvideo_decode_block_opcode_0x3;
|
|
ipvideo_decode_block[0x4] = ipvideo_decode_block_opcode_0x4;
|
|
ipvideo_decode_block[0x5] = ipvideo_decode_block_opcode_0x5;
|
|
ipvideo_decode_block[0x6] = ipvideo_decode_block_opcode_0x6;
|
|
ipvideo_decode_block[0x7] = ipvideo_decode_block_opcode_0x7;
|
|
ipvideo_decode_block[0x8] = ipvideo_decode_block_opcode_0x8;
|
|
ipvideo_decode_block[0x9] = ipvideo_decode_block_opcode_0x9;
|
|
ipvideo_decode_block[0xA] = ipvideo_decode_block_opcode_0xA;
|
|
ipvideo_decode_block[0xB] = ipvideo_decode_block_opcode_0xB;
|
|
ipvideo_decode_block[0xC] = ipvideo_decode_block_opcode_0xC;
|
|
ipvideo_decode_block[0xD] = ipvideo_decode_block_opcode_0xD;
|
|
ipvideo_decode_block[0xE] = ipvideo_decode_block_opcode_0xE;
|
|
ipvideo_decode_block[0xF] = ipvideo_decode_block_opcode_0xF;
|
|
|
|
s->current_frame.data[0] = s->last_frame.data[0] =
|
|
s->second_last_frame.data[0] = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ipvideo_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
IpvideoContext *s = avctx->priv_data;
|
|
AVPaletteControl *palette_control = avctx->palctrl;
|
|
|
|
/* compressed buffer needs to be large enough to at least hold an entire
|
|
* decoding map */
|
|
if (buf_size < s->decoding_map_size)
|
|
return buf_size;
|
|
|
|
s->decoding_map = buf;
|
|
s->buf = buf + s->decoding_map_size;
|
|
s->size = buf_size - s->decoding_map_size;
|
|
|
|
s->current_frame.reference = 3;
|
|
if (avctx->get_buffer(avctx, &s->current_frame)) {
|
|
av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
ipvideo_decode_opcodes(s);
|
|
|
|
if (palette_control->palette_changed) {
|
|
palette_control->palette_changed = 0;
|
|
s->current_frame.palette_has_changed = 1;
|
|
}
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = s->current_frame;
|
|
|
|
/* shuffle frames */
|
|
if (s->second_last_frame.data[0])
|
|
avctx->release_buffer(avctx, &s->second_last_frame);
|
|
s->second_last_frame = s->last_frame;
|
|
s->last_frame = s->current_frame;
|
|
s->current_frame.data[0] = NULL; /* catch any access attempts */
|
|
|
|
/* report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
static int ipvideo_decode_end(AVCodecContext *avctx)
|
|
{
|
|
IpvideoContext *s = avctx->priv_data;
|
|
|
|
/* release the last frame */
|
|
if (s->last_frame.data[0])
|
|
avctx->release_buffer(avctx, &s->last_frame);
|
|
if (s->second_last_frame.data[0])
|
|
avctx->release_buffer(avctx, &s->second_last_frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec interplay_video_decoder = {
|
|
"interplayvideo",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_INTERPLAY_VIDEO,
|
|
sizeof(IpvideoContext),
|
|
ipvideo_decode_init,
|
|
NULL,
|
|
ipvideo_decode_end,
|
|
ipvideo_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
};
|