ffmpeg / libavcodec / interplayvideo.c @ 5509bffa
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/*
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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 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., 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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|
| 460 |
for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) { |
| 461 |
|
| 462 |
if (flags & bitmask)
|
| 463 |
*s->pixel_ptr++ = P1; |
| 464 |
else
|
| 465 |
*s->pixel_ptr++ = P0; |
| 466 |
} |
| 467 |
s->pixel_ptr += s->line_inc; |
| 468 |
} |
| 469 |
} |
| 470 |
} |
| 471 |
|
| 472 |
/* report success */
|
| 473 |
return 0; |
| 474 |
} |
| 475 |
|
| 476 |
static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s) |
| 477 |
{
|
| 478 |
int x, y;
|
| 479 |
unsigned char P[4]; |
| 480 |
unsigned char B[4]; |
| 481 |
unsigned int flags = 0; |
| 482 |
int shifter = 0; |
| 483 |
unsigned char pix; |
| 484 |
|
| 485 |
/* 4-color encoding */
|
| 486 |
CHECK_STREAM_PTR(4);
|
| 487 |
|
| 488 |
for (y = 0; y < 4; y++) |
| 489 |
P[y] = *s->stream_ptr++; |
| 490 |
|
| 491 |
if ((P[0] <= P[1]) && (P[2] <= P[3])) { |
| 492 |
|
| 493 |
/* 1 of 4 colors for each pixel, need 16 more bytes */
|
| 494 |
CHECK_STREAM_PTR(16);
|
| 495 |
|
| 496 |
for (y = 0; y < 8; y++) { |
| 497 |
/* get the next set of 8 2-bit flags */
|
| 498 |
flags = (s->stream_ptr[1] << 8) | s->stream_ptr[0]; |
| 499 |
s->stream_ptr += 2;
|
| 500 |
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) { |
| 501 |
*s->pixel_ptr++ = P[(flags >> shifter) & 0x03];
|
| 502 |
} |
| 503 |
s->pixel_ptr += s->line_inc; |
| 504 |
} |
| 505 |
|
| 506 |
} else if ((P[0] <= P[1]) && (P[2] > P[3])) { |
| 507 |
|
| 508 |
/* 1 of 4 colors for each 2x2 block, need 4 more bytes */
|
| 509 |
CHECK_STREAM_PTR(4);
|
| 510 |
|
| 511 |
B[0] = *s->stream_ptr++;
|
| 512 |
B[1] = *s->stream_ptr++;
|
| 513 |
B[2] = *s->stream_ptr++;
|
| 514 |
B[3] = *s->stream_ptr++;
|
| 515 |
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0]; |
| 516 |
shifter = 0;
|
| 517 |
|
| 518 |
for (y = 0; y < 8; y += 2) { |
| 519 |
for (x = 0; x < 8; x += 2, shifter += 2) { |
| 520 |
pix = P[(flags >> shifter) & 0x03];
|
| 521 |
*(s->pixel_ptr + x) = pix; |
| 522 |
*(s->pixel_ptr + x + 1) = pix;
|
| 523 |
*(s->pixel_ptr + s->stride + x) = pix; |
| 524 |
*(s->pixel_ptr + s->stride + x + 1) = pix;
|
| 525 |
} |
| 526 |
s->pixel_ptr += s->stride * 2;
|
| 527 |
} |
| 528 |
|
| 529 |
} else if ((P[0] > P[1]) && (P[2] <= P[3])) { |
| 530 |
|
| 531 |
/* 1 of 4 colors for each 2x1 block, need 8 more bytes */
|
| 532 |
CHECK_STREAM_PTR(8);
|
| 533 |
|
| 534 |
for (y = 0; y < 8; y++) { |
| 535 |
/* time to reload flags? */
|
| 536 |
if ((y == 0) || (y == 4)) { |
| 537 |
B[0] = *s->stream_ptr++;
|
| 538 |
B[1] = *s->stream_ptr++;
|
| 539 |
B[2] = *s->stream_ptr++;
|
| 540 |
B[3] = *s->stream_ptr++;
|
| 541 |
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0]; |
| 542 |
shifter = 0;
|
| 543 |
} |
| 544 |
for (x = 0; x < 8; x += 2, shifter += 2) { |
| 545 |
pix = P[(flags >> shifter) & 0x03];
|
| 546 |
*(s->pixel_ptr + x) = pix; |
| 547 |
*(s->pixel_ptr + x + 1) = pix;
|
| 548 |
} |
| 549 |
s->pixel_ptr += s->stride; |
| 550 |
} |
| 551 |
|
| 552 |
} else {
|
| 553 |
|
| 554 |
/* 1 of 4 colors for each 1x2 block, need 8 more bytes */
|
| 555 |
CHECK_STREAM_PTR(8);
|
| 556 |
|
| 557 |
for (y = 0; y < 8; y += 2) { |
| 558 |
/* time to reload flags? */
|
| 559 |
if ((y == 0) || (y == 4)) { |
| 560 |
B[0] = *s->stream_ptr++;
|
| 561 |
B[1] = *s->stream_ptr++;
|
| 562 |
B[2] = *s->stream_ptr++;
|
| 563 |
B[3] = *s->stream_ptr++;
|
| 564 |
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0]; |
| 565 |
shifter = 0;
|
| 566 |
} |
| 567 |
for (x = 0; x < 8; x++, shifter += 2) { |
| 568 |
pix = P[(flags >> shifter) & 0x03];
|
| 569 |
*(s->pixel_ptr + x) = pix; |
| 570 |
*(s->pixel_ptr + s->stride + x) = pix; |
| 571 |
} |
| 572 |
s->pixel_ptr += s->stride * 2;
|
| 573 |
} |
| 574 |
} |
| 575 |
|
| 576 |
/* report success */
|
| 577 |
return 0; |
| 578 |
} |
| 579 |
|
| 580 |
static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s) |
| 581 |
{
|
| 582 |
int x, y;
|
| 583 |
unsigned char P[16]; |
| 584 |
unsigned char B[16]; |
| 585 |
int flags = 0; |
| 586 |
int shifter = 0; |
| 587 |
int index;
|
| 588 |
int split;
|
| 589 |
int lower_half;
|
| 590 |
|
| 591 |
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
|
| 592 |
* either top and bottom or left and right halves */
|
| 593 |
CHECK_STREAM_PTR(4);
|
| 594 |
|
| 595 |
for (y = 0; y < 4; y++) |
| 596 |
P[y] = *s->stream_ptr++; |
| 597 |
|
| 598 |
if (P[0] <= P[1]) { |
| 599 |
|
| 600 |
/* 4-color encoding for each quadrant; need 28 more bytes */
|
| 601 |
CHECK_STREAM_PTR(28);
|
| 602 |
|
| 603 |
for (y = 0; y < 4; y++) |
| 604 |
B[y] = *s->stream_ptr++; |
| 605 |
for (y = 4; y < 16; y += 4) { |
| 606 |
for (x = y; x < y + 4; x++) |
| 607 |
P[x] = *s->stream_ptr++; |
| 608 |
for (x = y; x < y + 4; x++) |
| 609 |
B[x] = *s->stream_ptr++; |
| 610 |
} |
| 611 |
|
| 612 |
for (y = 0; y < 8; y++) { |
| 613 |
|
| 614 |
lower_half = (y >= 4) ? 4 : 0; |
| 615 |
flags = (B[y + 8] << 8) | B[y]; |
| 616 |
|
| 617 |
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) { |
| 618 |
split = (x >= 4) ? 8 : 0; |
| 619 |
index = split + lower_half + ((flags >> shifter) & 0x03);
|
| 620 |
*s->pixel_ptr++ = P[index]; |
| 621 |
} |
| 622 |
|
| 623 |
s->pixel_ptr += s->line_inc; |
| 624 |
} |
| 625 |
|
| 626 |
} else {
|
| 627 |
|
| 628 |
/* 4-color encoding for either left and right or top and bottom
|
| 629 |
* halves; need 20 more bytes */
|
| 630 |
CHECK_STREAM_PTR(20);
|
| 631 |
|
| 632 |
for (y = 0; y < 8; y++) |
| 633 |
B[y] = *s->stream_ptr++; |
| 634 |
for (y = 4; y < 8; y++) |
| 635 |
P[y] = *s->stream_ptr++; |
| 636 |
for (y = 8; y < 16; y++) |
| 637 |
B[y] = *s->stream_ptr++; |
| 638 |
|
| 639 |
if (P[4] <= P[5]) { |
| 640 |
|
| 641 |
/* block is divided into left and right halves */
|
| 642 |
for (y = 0; y < 8; y++) { |
| 643 |
|
| 644 |
flags = (B[y + 8] << 8) | B[y]; |
| 645 |
split = 0;
|
| 646 |
|
| 647 |
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) { |
| 648 |
if (x == 4) |
| 649 |
split = 4;
|
| 650 |
*s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
|
| 651 |
} |
| 652 |
|
| 653 |
s->pixel_ptr += s->line_inc; |
| 654 |
} |
| 655 |
|
| 656 |
} else {
|
| 657 |
|
| 658 |
/* block is divided into top and bottom halves */
|
| 659 |
split = 0;
|
| 660 |
for (y = 0; y < 8; y++) { |
| 661 |
|
| 662 |
flags = (B[y * 2 + 1] << 8) | B[y * 2]; |
| 663 |
if (y == 4) |
| 664 |
split = 4;
|
| 665 |
|
| 666 |
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) |
| 667 |
*s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
|
| 668 |
|
| 669 |
s->pixel_ptr += s->line_inc; |
| 670 |
} |
| 671 |
} |
| 672 |
} |
| 673 |
|
| 674 |
/* report success */
|
| 675 |
return 0; |
| 676 |
} |
| 677 |
|
| 678 |
static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s) |
| 679 |
{
|
| 680 |
int x, y;
|
| 681 |
|
| 682 |
/* 64-color encoding (each pixel in block is a different color) */
|
| 683 |
CHECK_STREAM_PTR(64);
|
| 684 |
|
| 685 |
for (y = 0; y < 8; y++) { |
| 686 |
for (x = 0; x < 8; x++) { |
| 687 |
*s->pixel_ptr++ = *s->stream_ptr++; |
| 688 |
} |
| 689 |
s->pixel_ptr += s->line_inc; |
| 690 |
} |
| 691 |
|
| 692 |
/* report success */
|
| 693 |
return 0; |
| 694 |
} |
| 695 |
|
| 696 |
static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s) |
| 697 |
{
|
| 698 |
int x, y;
|
| 699 |
unsigned char pix; |
| 700 |
|
| 701 |
/* 16-color block encoding: each 2x2 block is a different color */
|
| 702 |
CHECK_STREAM_PTR(16);
|
| 703 |
|
| 704 |
for (y = 0; y < 8; y += 2) { |
| 705 |
for (x = 0; x < 8; x += 2) { |
| 706 |
pix = *s->stream_ptr++; |
| 707 |
*(s->pixel_ptr + x) = pix; |
| 708 |
*(s->pixel_ptr + x + 1) = pix;
|
| 709 |
*(s->pixel_ptr + s->stride + x) = pix; |
| 710 |
*(s->pixel_ptr + s->stride + x + 1) = pix;
|
| 711 |
} |
| 712 |
s->pixel_ptr += s->stride * 2;
|
| 713 |
} |
| 714 |
|
| 715 |
/* report success */
|
| 716 |
return 0; |
| 717 |
} |
| 718 |
|
| 719 |
static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s) |
| 720 |
{
|
| 721 |
int x, y;
|
| 722 |
unsigned char P[4]; |
| 723 |
unsigned char index = 0; |
| 724 |
|
| 725 |
/* 4-color block encoding: each 4x4 block is a different color */
|
| 726 |
CHECK_STREAM_PTR(4);
|
| 727 |
|
| 728 |
for (y = 0; y < 4; y++) |
| 729 |
P[y] = *s->stream_ptr++; |
| 730 |
|
| 731 |
for (y = 0; y < 8; y++) { |
| 732 |
if (y < 4) |
| 733 |
index = 0;
|
| 734 |
else
|
| 735 |
index = 2;
|
| 736 |
|
| 737 |
for (x = 0; x < 8; x++) { |
| 738 |
if (x == 4) |
| 739 |
index++; |
| 740 |
*s->pixel_ptr++ = P[index]; |
| 741 |
} |
| 742 |
s->pixel_ptr += s->line_inc; |
| 743 |
} |
| 744 |
|
| 745 |
/* report success */
|
| 746 |
return 0; |
| 747 |
} |
| 748 |
|
| 749 |
static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s) |
| 750 |
{
|
| 751 |
int x, y;
|
| 752 |
unsigned char pix; |
| 753 |
|
| 754 |
/* 1-color encoding: the whole block is 1 solid color */
|
| 755 |
CHECK_STREAM_PTR(1);
|
| 756 |
pix = *s->stream_ptr++; |
| 757 |
|
| 758 |
for (y = 0; y < 8; y++) { |
| 759 |
for (x = 0; x < 8; x++) { |
| 760 |
*s->pixel_ptr++ = pix; |
| 761 |
} |
| 762 |
s->pixel_ptr += s->line_inc; |
| 763 |
} |
| 764 |
|
| 765 |
/* report success */
|
| 766 |
return 0; |
| 767 |
} |
| 768 |
|
| 769 |
static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s) |
| 770 |
{
|
| 771 |
int x, y;
|
| 772 |
unsigned char sample0, sample1; |
| 773 |
|
| 774 |
/* dithered encoding */
|
| 775 |
CHECK_STREAM_PTR(2);
|
| 776 |
sample0 = *s->stream_ptr++; |
| 777 |
sample1 = *s->stream_ptr++; |
| 778 |
|
| 779 |
for (y = 0; y < 8; y++) { |
| 780 |
for (x = 0; x < 8; x += 2) { |
| 781 |
if (y & 1) { |
| 782 |
*s->pixel_ptr++ = sample1; |
| 783 |
*s->pixel_ptr++ = sample0; |
| 784 |
} else {
|
| 785 |
*s->pixel_ptr++ = sample0; |
| 786 |
*s->pixel_ptr++ = sample1; |
| 787 |
} |
| 788 |
} |
| 789 |
s->pixel_ptr += s->line_inc; |
| 790 |
} |
| 791 |
|
| 792 |
/* report success */
|
| 793 |
return 0; |
| 794 |
} |
| 795 |
|
| 796 |
static int (*ipvideo_decode_block[16])(IpvideoContext *s); |
| 797 |
|
| 798 |
static void ipvideo_decode_opcodes(IpvideoContext *s) |
| 799 |
{
|
| 800 |
int x, y;
|
| 801 |
int index = 0; |
| 802 |
unsigned char opcode; |
| 803 |
int ret;
|
| 804 |
int code_counts[16]; |
| 805 |
static int frame = 0; |
| 806 |
|
| 807 |
debug_interplay("------------------ frame %d\n", frame);
|
| 808 |
frame++; |
| 809 |
|
| 810 |
for (x = 0; x < 16; x++) |
| 811 |
code_counts[x] = 0;
|
| 812 |
|
| 813 |
/* this is PAL8, so make the palette available */
|
| 814 |
memcpy(s->current_frame.data[1], s->avctx->palctrl->palette, PALETTE_COUNT * 4); |
| 815 |
|
| 816 |
s->stride = s->current_frame.linesize[0];
|
| 817 |
s->stream_ptr = s->buf + 14; /* data starts 14 bytes in */ |
| 818 |
s->stream_end = s->buf + s->size; |
| 819 |
s->line_inc = s->stride - 8;
|
| 820 |
s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride
|
| 821 |
+ s->avctx->width - 8;
|
| 822 |
s->dsp = s->dsp; |
| 823 |
|
| 824 |
for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) { |
| 825 |
for (x = y; x < y + s->avctx->width; x += 8) { |
| 826 |
/* bottom nibble first, then top nibble (which makes it
|
| 827 |
* hard to use a GetBitcontext) */
|
| 828 |
if (index & 1) |
| 829 |
opcode = s->decoding_map[index >> 1] >> 4; |
| 830 |
else
|
| 831 |
opcode = s->decoding_map[index >> 1] & 0xF; |
| 832 |
index++; |
| 833 |
|
| 834 |
debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
|
| 835 |
x - y, y / s->stride, opcode, s->stream_ptr); |
| 836 |
code_counts[opcode]++; |
| 837 |
|
| 838 |
s->pixel_ptr = s->current_frame.data[0] + x;
|
| 839 |
ret = ipvideo_decode_block[opcode](s); |
| 840 |
if (ret != 0) { |
| 841 |
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
|
| 842 |
frame, x - y, y / s->stride); |
| 843 |
return;
|
| 844 |
} |
| 845 |
} |
| 846 |
} |
| 847 |
if ((s->stream_ptr != s->stream_end) &&
|
| 848 |
(s->stream_ptr + 1 != s->stream_end)) {
|
| 849 |
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n",
|
| 850 |
s->stream_end - s->stream_ptr); |
| 851 |
} |
| 852 |
} |
| 853 |
|
| 854 |
static int ipvideo_decode_init(AVCodecContext *avctx) |
| 855 |
{
|
| 856 |
IpvideoContext *s = avctx->priv_data; |
| 857 |
|
| 858 |
s->avctx = avctx; |
| 859 |
|
| 860 |
if (s->avctx->palctrl == NULL) { |
| 861 |
av_log(avctx, AV_LOG_ERROR, " Interplay video: palette expected.\n");
|
| 862 |
return -1; |
| 863 |
} |
| 864 |
|
| 865 |
avctx->pix_fmt = PIX_FMT_PAL8; |
| 866 |
avctx->has_b_frames = 0;
|
| 867 |
dsputil_init(&s->dsp, avctx); |
| 868 |
|
| 869 |
/* decoding map contains 4 bits of information per 8x8 block */
|
| 870 |
s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2); |
| 871 |
|
| 872 |
/* assign block decode functions */
|
| 873 |
ipvideo_decode_block[0x0] = ipvideo_decode_block_opcode_0x0;
|
| 874 |
ipvideo_decode_block[0x1] = ipvideo_decode_block_opcode_0x1;
|
| 875 |
ipvideo_decode_block[0x2] = ipvideo_decode_block_opcode_0x2;
|
| 876 |
ipvideo_decode_block[0x3] = ipvideo_decode_block_opcode_0x3;
|
| 877 |
ipvideo_decode_block[0x4] = ipvideo_decode_block_opcode_0x4;
|
| 878 |
ipvideo_decode_block[0x5] = ipvideo_decode_block_opcode_0x5;
|
| 879 |
ipvideo_decode_block[0x6] = ipvideo_decode_block_opcode_0x6;
|
| 880 |
ipvideo_decode_block[0x7] = ipvideo_decode_block_opcode_0x7;
|
| 881 |
ipvideo_decode_block[0x8] = ipvideo_decode_block_opcode_0x8;
|
| 882 |
ipvideo_decode_block[0x9] = ipvideo_decode_block_opcode_0x9;
|
| 883 |
ipvideo_decode_block[0xA] = ipvideo_decode_block_opcode_0xA;
|
| 884 |
ipvideo_decode_block[0xB] = ipvideo_decode_block_opcode_0xB;
|
| 885 |
ipvideo_decode_block[0xC] = ipvideo_decode_block_opcode_0xC;
|
| 886 |
ipvideo_decode_block[0xD] = ipvideo_decode_block_opcode_0xD;
|
| 887 |
ipvideo_decode_block[0xE] = ipvideo_decode_block_opcode_0xE;
|
| 888 |
ipvideo_decode_block[0xF] = ipvideo_decode_block_opcode_0xF;
|
| 889 |
|
| 890 |
s->current_frame.data[0] = s->last_frame.data[0] = |
| 891 |
s->second_last_frame.data[0] = NULL; |
| 892 |
|
| 893 |
return 0; |
| 894 |
} |
| 895 |
|
| 896 |
static int ipvideo_decode_frame(AVCodecContext *avctx, |
| 897 |
void *data, int *data_size, |
| 898 |
uint8_t *buf, int buf_size)
|
| 899 |
{
|
| 900 |
IpvideoContext *s = avctx->priv_data; |
| 901 |
AVPaletteControl *palette_control = avctx->palctrl; |
| 902 |
|
| 903 |
/* compressed buffer needs to be large enough to at least hold an entire
|
| 904 |
* decoding map */
|
| 905 |
if (buf_size < s->decoding_map_size)
|
| 906 |
return buf_size;
|
| 907 |
|
| 908 |
s->decoding_map = buf; |
| 909 |
s->buf = buf + s->decoding_map_size; |
| 910 |
s->size = buf_size - s->decoding_map_size; |
| 911 |
|
| 912 |
s->current_frame.reference = 3;
|
| 913 |
if (avctx->get_buffer(avctx, &s->current_frame)) {
|
| 914 |
av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n");
|
| 915 |
return -1; |
| 916 |
} |
| 917 |
|
| 918 |
ipvideo_decode_opcodes(s); |
| 919 |
|
| 920 |
if (palette_control->palette_changed) {
|
| 921 |
palette_control->palette_changed = 0;
|
| 922 |
s->current_frame.palette_has_changed = 1;
|
| 923 |
} |
| 924 |
|
| 925 |
*data_size = sizeof(AVFrame);
|
| 926 |
*(AVFrame*)data = s->current_frame; |
| 927 |
|
| 928 |
/* shuffle frames */
|
| 929 |
if (s->second_last_frame.data[0]) |
| 930 |
avctx->release_buffer(avctx, &s->second_last_frame); |
| 931 |
s->second_last_frame = s->last_frame; |
| 932 |
s->last_frame = s->current_frame; |
| 933 |
s->current_frame.data[0] = NULL; /* catch any access attempts */ |
| 934 |
|
| 935 |
/* report that the buffer was completely consumed */
|
| 936 |
return buf_size;
|
| 937 |
} |
| 938 |
|
| 939 |
static int ipvideo_decode_end(AVCodecContext *avctx) |
| 940 |
{
|
| 941 |
IpvideoContext *s = avctx->priv_data; |
| 942 |
|
| 943 |
/* release the last frame */
|
| 944 |
if (s->last_frame.data[0]) |
| 945 |
avctx->release_buffer(avctx, &s->last_frame); |
| 946 |
if (s->second_last_frame.data[0]) |
| 947 |
avctx->release_buffer(avctx, &s->second_last_frame); |
| 948 |
|
| 949 |
return 0; |
| 950 |
} |
| 951 |
|
| 952 |
AVCodec interplay_video_decoder = {
|
| 953 |
"interplayvideo",
|
| 954 |
CODEC_TYPE_VIDEO, |
| 955 |
CODEC_ID_INTERPLAY_VIDEO, |
| 956 |
sizeof(IpvideoContext),
|
| 957 |
ipvideo_decode_init, |
| 958 |
NULL,
|
| 959 |
ipvideo_decode_end, |
| 960 |
ipvideo_decode_frame, |
| 961 |
CODEC_CAP_DR1, |
| 962 |
}; |