Start working on a branch where FFmpeg is not copied, patched and carved to be built with automake but instead imported inline and built using its own build system. This is an import of a slightly modified FFmpeg current tree. xine-lib builds, install and run fine with it, but there are of course plenty of things that needs to be fixed before it can even be considered for a 1.2.x series. Work will continue in the next days of course.

CVS patchset: 8397
CVS date: 2006/12/02 01:19:48

1 files changed, 964 insertions, 0 deletions

diff --git a/contrib/ffmpeg/libavcodec/interplayvideo.c b/contrib/ffmpeg/libavcodec/interplayvideo.c
new file mode 100644
index 000000000..95059c365
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/interplayvideo.c
@@ -0,0 +1,964 @@
+/*
+ * Interplay MVE Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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(x,...) av_log(NULL, AV_LOG_DEBUG, x, __VA_ARGS__)
+#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 *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) { \
+    av_log(s->avctx, AV_LOG_ERROR, "Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
+      s->stream_ptr + n, s->stream_end); \
+    return -1; \
+  }
+
+#define COPY_FROM_CURRENT() \
+    motion_offset = current_offset; \
+    motion_offset += y * s->stride; \
+    motion_offset += x; \
+    if (motion_offset < 0) { \
+        av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
+        return -1; \
+    } else if (motion_offset > s->upper_motion_limit_offset) { \
+        av_log(s->avctx, AV_LOG_ERROR, " 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) { \
+        av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
+        return -1; \
+    } else if (motion_offset > s->upper_motion_limit_offset) { \
+        av_log(s->avctx, AV_LOG_ERROR, " 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) { \
+        av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
+        return -1; \
+    } else if (motion_offset > s->upper_motion_limit_offset) { \
+        av_log(s->avctx, AV_LOG_ERROR, " 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? */
+    av_log(s->avctx, AV_LOG_ERROR, "  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->avctx->palctrl->palette, PALETTE_COUNT * 4);
+
+    s->stride = s->current_frame.linesize[0];
+    s->stream_ptr = s->buf + 14;  /* data starts 14 bytes in */
+    s->stream_end = s->buf + s->size;
+    s->line_inc = s->stride - 8;
+    s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride
+        + s->avctx->width - 8;
+    s->dsp = s->dsp;
+
+    for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) {
+        for (x = y; x < y + s->avctx->width; x += 8) {
+            /* bottom nibble first, then top nibble (which makes it
+             * hard to use a GetBitcontext) */
+            if (index & 1)
+                opcode = s->decoding_map[index >> 1] >> 4;
+            else
+                opcode = s->decoding_map[index >> 1] & 0xF;
+            index++;
+
+            debug_interplay("  block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
+                x - y, y / s->stride, opcode, s->stream_ptr);
+            code_counts[opcode]++;
+
+            s->pixel_ptr = s->current_frame.data[0] + x;
+            ret = ipvideo_decode_block[opcode](s);
+            if (ret != 0) {
+                av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
+                    frame, x - y, y / s->stride);
+                return;
+            }
+        }
+    }
+    if ((s->stream_ptr != s->stream_end) &&
+        (s->stream_ptr + 1 != s->stream_end)) {
+        av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n",
+            s->stream_end - s->stream_ptr);
+    }
+}
+
+static int ipvideo_decode_init(AVCodecContext *avctx)
+{
+    IpvideoContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+
+    if (s->avctx->palctrl == NULL) {
+        av_log(avctx, AV_LOG_ERROR, " Interplay video: palette expected.\n");
+        return -1;
+    }
+
+    avctx->pix_fmt = PIX_FMT_PAL8;
+    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 = avctx->palctrl;
+
+    /* compressed buffer needs to be large enough to at least hold an entire
+     * decoding map */
+    if (buf_size < s->decoding_map_size)
+        return buf_size;
+
+    s->decoding_map = buf;
+    s->buf = buf + s->decoding_map_size;
+    s->size = buf_size - s->decoding_map_size;
+
+    s->current_frame.reference = 3;
+    if (avctx->get_buffer(avctx, &s->current_frame)) {
+        av_log(avctx, AV_LOG_ERROR, "  Interplay Video: get_buffer() failed\n");
+        return -1;
+    }
+
+    ipvideo_decode_opcodes(s);
+
+    if (palette_control->palette_changed) {
+        palette_control->palette_changed = 0;
+        s->current_frame.palette_has_changed = 1;
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->current_frame;
+
+    /* shuffle frames */
+    if (s->second_last_frame.data[0])
+        avctx->release_buffer(avctx, &s->second_last_frame);
+    s->second_last_frame = s->last_frame;
+    s->last_frame = s->current_frame;
+    s->current_frame.data[0] = NULL;  /* catch any access attempts */
+
+    /* report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static int ipvideo_decode_end(AVCodecContext *avctx)
+{
+    IpvideoContext *s = avctx->priv_data;
+
+    /* release the last frame */
+    if (s->last_frame.data[0])
+        avctx->release_buffer(avctx, &s->last_frame);
+    if (s->second_last_frame.data[0])
+        avctx->release_buffer(avctx, &s->second_last_frame);
+
+    return 0;
+}
+
+AVCodec interplay_video_decoder = {
+    "interplayvideo",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_INTERPLAY_VIDEO,
+    sizeof(IpvideoContext),
+    ipvideo_decode_init,
+    NULL,
+    ipvideo_decode_end,
+    ipvideo_decode_frame,
+    CODEC_CAP_DR1,
+};