+++ /dev/null
-/*
- * Interplay MVE Video Decoder
- * Copyright (C) 2003 the ffmpeg project
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-/**
- * @file interplayvideo.c
- * Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net)
- * For more information about the Interplay MVE format, visit:
- * http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
- * This code is written in such a way that the identifiers match up
- * with the encoding descriptions in the document.
- *
- * This decoder presently only supports a PAL8 output colorspace.
- *
- * An Interplay video frame consists of 2 parts: The decoding map and
- * the video data. A demuxer must load these 2 parts together in a single
- * buffer before sending it through the stream to this decoder.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "common.h"
-#include "avcodec.h"
-#include "dsputil.h"
-
-#define PALETTE_COUNT 256
-
-/* debugging support */
-#define DEBUG_INTERPLAY 0
-#if DEBUG_INTERPLAY
-#define debug_interplay printf
-#else
-static inline void debug_interplay(const char *format, ...) { }
-#endif
-
-typedef struct IpvideoContext {
-
- AVCodecContext *avctx;
- DSPContext dsp;
- AVFrame second_last_frame;
- AVFrame last_frame;
- AVFrame current_frame;
- unsigned char *decoding_map;
- int decoding_map_size;
-
- unsigned char *buf;
- int size;
-
- unsigned char palette[PALETTE_COUNT * 4];
-
- unsigned char *stream_ptr;
- unsigned char *stream_end;
- unsigned char *pixel_ptr;
- int line_inc;
- int stride;
- int upper_motion_limit_offset;
-
-} IpvideoContext;
-
-#define CHECK_STREAM_PTR(n) \
- if ((s->stream_ptr + n) > s->stream_end) { \
- printf ("Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
- s->stream_ptr + n, s->stream_end); \
- return -1; \
- }
-
-static void ipvideo_new_palette(IpvideoContext *s, unsigned char *palette) {
-
- int i;
- unsigned char r, g, b;
- unsigned int *palette32;
-
- palette32 = (unsigned int *)s->palette;
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = *palette++;
- g = *palette++;
- b = *palette++;
- palette32[i] = (r << 16) | (g << 8) | (b);
- }
-}
-
-#define COPY_FROM_CURRENT() \
- motion_offset = current_offset; \
- motion_offset += y * s->stride; \
- motion_offset += x; \
- if (motion_offset < 0) { \
- printf (" Interplay video: motion offset < 0 (%d)\n", motion_offset); \
- return -1; \
- } else if (motion_offset > s->upper_motion_limit_offset) { \
- printf (" Interplay video: motion offset above limit (%d >= %d)\n", \
- motion_offset, s->upper_motion_limit_offset); \
- return -1; \
- } \
- s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
- s->current_frame.data[0] + motion_offset, s->stride, 8);
-
-#define COPY_FROM_PREVIOUS() \
- motion_offset = current_offset; \
- motion_offset += y * s->stride; \
- motion_offset += x; \
- if (motion_offset < 0) { \
- printf (" Interplay video: motion offset < 0 (%d)\n", motion_offset); \
- return -1; \
- } else if (motion_offset > s->upper_motion_limit_offset) { \
- printf (" Interplay video: motion offset above limit (%d >= %d)\n", \
- motion_offset, s->upper_motion_limit_offset); \
- return -1; \
- } \
- s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
- s->last_frame.data[0] + motion_offset, s->stride, 8);
-
-#define COPY_FROM_SECOND_LAST() \
- motion_offset = current_offset; \
- motion_offset += y * s->stride; \
- motion_offset += x; \
- if (motion_offset < 0) { \
- printf (" Interplay video: motion offset < 0 (%d)\n", motion_offset); \
- return -1; \
- } else if (motion_offset > s->upper_motion_limit_offset) { \
- printf (" Interplay video: motion offset above limit (%d >= %d)\n", \
- motion_offset, s->upper_motion_limit_offset); \
- return -1; \
- } \
- s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
- s->second_last_frame.data[0] + motion_offset, s->stride, 8);
-
-static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s)
-{
- int x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
-
- /* copy a block from the previous frame */
- x = y = 0;
- COPY_FROM_PREVIOUS();
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s)
-{
- int x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
-
- /* copy block from 2 frames ago */
- x = y = 0;
- COPY_FROM_SECOND_LAST();
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s)
-{
- unsigned char B;
- int x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
-
- /* copy block from 2 frames ago using a motion vector; need 1 more byte */
- CHECK_STREAM_PTR(1);
- B = *s->stream_ptr++;
-
- if (B < 56) {
- x = 8 + (B % 7);
- y = B / 7;
- } else {
- x = -14 + ((B - 56) % 29);
- y = 8 + ((B - 56) / 29);
- }
-
- debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
- COPY_FROM_SECOND_LAST();
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s)
-{
- unsigned char B;
- int x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
-
- /* copy 8x8 block from current frame from an up/left block */
-
- /* need 1 more byte for motion */
- CHECK_STREAM_PTR(1);
- B = *s->stream_ptr++;
-
- if (B < 56) {
- x = -(8 + (B % 7));
- y = -(B / 7);
- } else {
- x = -(-14 + ((B - 56) % 29));
- y = -( 8 + ((B - 56) / 29));
- }
-
- debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
- COPY_FROM_CURRENT();
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s)
-{
- int x, y;
- unsigned char B, BL, BH;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
-
- /* copy a block from the previous frame; need 1 more byte */
- CHECK_STREAM_PTR(1);
-
- B = *s->stream_ptr++;
- BL = B & 0x0F;
- BH = (B >> 4) & 0x0F;
- x = -8 + BL;
- y = -8 + BH;
-
- debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
- COPY_FROM_PREVIOUS();
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s)
-{
- signed char x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
-
- /* copy a block from the previous frame using an expanded range;
- * need 2 more bytes */
- CHECK_STREAM_PTR(2);
-
- x = *s->stream_ptr++;
- y = *s->stream_ptr++;
-
- debug_interplay (" motion bytes = %d, %d\n", x, y);
- COPY_FROM_PREVIOUS();
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s)
-{
- /* mystery opcode? skip multiple blocks? */
- printf (" Interplay video: Help! Mystery opcode 0x6 seen\n");
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
-{
- int x, y;
- unsigned char P0, P1;
- unsigned char B[8];
- unsigned int flags;
- int bitmask;
-
- /* 2-color encoding */
- CHECK_STREAM_PTR(2);
-
- P0 = *s->stream_ptr++;
- P1 = *s->stream_ptr++;
-
- if (P0 <= P1) {
-
- /* need 8 more bytes from the stream */
- CHECK_STREAM_PTR(8);
- for (y = 0; y < 8; y++)
- B[y] = *s->stream_ptr++;
-
- for (y = 0; y < 8; y++) {
- flags = B[y];
- for (x = 0x01; x <= 0x80; x <<= 1) {
- if (flags & x)
- *s->pixel_ptr++ = P1;
- else
- *s->pixel_ptr++ = P0;
- }
- s->pixel_ptr += s->line_inc;
- }
-
- } else {
-
- /* need 2 more bytes from the stream */
- CHECK_STREAM_PTR(2);
- B[0] = *s->stream_ptr++;
- B[1] = *s->stream_ptr++;
-
- flags = (B[1] << 8) | B[0];
- bitmask = 0x0001;
- for (y = 0; y < 8; y += 2) {
- for (x = 0; x < 8; x += 2, bitmask <<= 1) {
- if (flags & bitmask) {
- *(s->pixel_ptr + x) = P1;
- *(s->pixel_ptr + x + 1) = P1;
- *(s->pixel_ptr + s->stride + x) = P1;
- *(s->pixel_ptr + s->stride + x + 1) = P1;
- } else {
- *(s->pixel_ptr + x) = P0;
- *(s->pixel_ptr + x + 1) = P0;
- *(s->pixel_ptr + s->stride + x) = P0;
- *(s->pixel_ptr + s->stride + x + 1) = P0;
- }
- }
- s->pixel_ptr += s->stride * 2;
- }
- }
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
-{
- int x, y;
- unsigned char P[8];
- unsigned char B[8];
- unsigned int flags = 0;
- unsigned int bitmask = 0;
- unsigned char P0 = 0, P1 = 0;
- int lower_half = 0;
-
- /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
- * either top and bottom or left and right halves */
- CHECK_STREAM_PTR(2);
-
- P[0] = *s->stream_ptr++;
- P[1] = *s->stream_ptr++;
-
- if (P[0] <= P[1]) {
-
- /* need 12 more bytes */
- CHECK_STREAM_PTR(12);
- B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
- P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
- B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
- P[4] = *s->stream_ptr++; P[5] = *s->stream_ptr++;
- B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
- P[6] = *s->stream_ptr++; P[7] = *s->stream_ptr++;
- B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
-
- for (y = 0; y < 8; y++) {
-
- /* time to reload flags? */
- if (y == 0) {
- flags =
- ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
- ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
- ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
- ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
- bitmask = 0x00000001;
- lower_half = 0; /* still on top half */
- } else if (y == 4) {
- flags =
- ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
- ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
- ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
- ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
- bitmask = 0x00000001;
- lower_half = 2;
- }
-
- for (x = 0; x < 8; x++, bitmask <<= 1) {
- /* get the pixel values ready for this quadrant */
- if (x == 0) {
- P0 = P[lower_half + 0];
- P1 = P[lower_half + 1];
- } else if (x == 4) {
- P0 = P[lower_half + 4];
- P1 = P[lower_half + 5];
- }
-
- if (flags & bitmask)
- *s->pixel_ptr++ = P1;
- else
- *s->pixel_ptr++ = P0;
- }
- s->pixel_ptr += s->line_inc;
- }
-
- } else {
-
- /* need 10 more bytes */
- CHECK_STREAM_PTR(10);
- B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
- B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
- P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
- B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
- B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
-
- if (P[2] <= P[3]) {
-
- /* vertical split; left & right halves are 2-color encoded */
-
- for (y = 0; y < 8; y++) {
-
- /* time to reload flags? */
- if (y == 0) {
- flags =
- ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
- ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
- ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
- ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
- bitmask = 0x00000001;
- } else if (y == 4) {
- flags =
- ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
- ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
- ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
- ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
- bitmask = 0x00000001;
- }
-
- for (x = 0; x < 8; x++, bitmask <<= 1) {
- /* get the pixel values ready for this half */
- if (x == 0) {
- P0 = P[0];
- P1 = P[1];
- } else if (x == 4) {
- P0 = P[2];
- P1 = P[3];
- }
-
- if (flags & bitmask)
- *s->pixel_ptr++ = P1;
- else
- *s->pixel_ptr++ = P0;
- }
- s->pixel_ptr += s->line_inc;
- }
-
- } else {
-
- /* horizontal split; top & bottom halves are 2-color encoded */
-
- for (y = 0; y < 8; y++) {
-
- flags = B[y];
- if (y == 0) {
- P0 = P[0];
- P1 = P[1];
- } else if (y == 4) {
- P0 = P[2];
- P1 = P[3];
- }
-
- for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {
-
- if (flags & bitmask)
- *s->pixel_ptr++ = P1;
- else
- *s->pixel_ptr++ = P0;
- }
- s->pixel_ptr += s->line_inc;
- }
- }
- }
-
- /* report success */
- return 0;
-}
-
-static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
-{
- int x, y;
- unsigned char P[4];
- unsigned char B[4];
- unsigned int flags = 0;
- int shifter = 0;
- unsigned char pix;
-
- /* 4-color encoding */
- CHECK_STREAM_PTR(4);
-
- for (y = 0; y < 4; y++)
- P[y] = *s->stream_ptr++;
-
- 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->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) {
- printf(" 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)) {
- printf (" Interplay video: decode finished with %d 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->extradata_size != sizeof(AVPaletteControl)) {
- printf (" Interplay video: expected extradata_size of %d\n",
- sizeof(AVPaletteControl));
- return -1;
- }
-
- avctx->pix_fmt = PIX_FMT_PAL8;
- avctx->has_b_frames = 0;
- 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 = (AVPaletteControl *)avctx->extradata;
-
- if (palette_control->palette_changed) {
- /* load the new palette and reset the palette control */
- ipvideo_new_palette(s, palette_control->palette);
- palette_control->palette_changed = 0;
- }
-
- 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)) {
- printf (" Interplay Video: get_buffer() failed\n");
- return -1;
- }
-
- ipvideo_decode_opcodes(s);
-
- *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,
-};
projects / synfig.git / blobdiff