--- /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