making act segmenter

1 files changed, 1027 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/interplayvideo.c b/ffmpeg/libavcodec/interplayvideo.c
new file mode 100644
index 0000000..4f710b8
--- /dev/null
+++ b/ffmpeg/libavcodec/interplayvideo.c
@@ -0,0 +1,1027 @@
+/*
+ * 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
+ * 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 "avcodec.h"
+#include "bytestream.h"
+#include "hpeldsp.h"
+#define BITSTREAM_READER_LE
+#include "get_bits.h"
+#include "internal.h"
+
+#define PALETTE_COUNT 256
+
+typedef struct IpvideoContext {
+
+    AVCodecContext *avctx;
+    HpelDSPContext hdsp;
+    AVFrame *second_last_frame;
+    AVFrame *last_frame;
+    const unsigned char *decoding_map;
+    int decoding_map_size;
+
+    int is_16bpp;
+    GetByteContext stream_ptr, mv_ptr;
+    unsigned char *pixel_ptr;
+    int line_inc;
+    int stride;
+    int upper_motion_limit_offset;
+
+    uint32_t pal[256];
+} IpvideoContext;
+
+static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x, int delta_y)
+{
+    int current_offset = s->pixel_ptr - dst->data[0];
+    int motion_offset = current_offset + delta_y * dst->linesize[0]
+                       + delta_x * (1 + s->is_16bpp);
+    if (motion_offset < 0) {
+        av_log(s->avctx, AV_LOG_ERROR, "motion offset < 0 (%d)\n", motion_offset);
+        return AVERROR_INVALIDDATA;
+    } else if (motion_offset > s->upper_motion_limit_offset) {
+        av_log(s->avctx, AV_LOG_ERROR, "motion offset above limit (%d >= %d)\n",
+            motion_offset, s->upper_motion_limit_offset);
+        return AVERROR_INVALIDDATA;
+    }
+    if (src->data[0] == NULL) {
+        av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n");
+        return AVERROR(EINVAL);
+    }
+    s->hdsp.put_pixels_tab[!s->is_16bpp][0](s->pixel_ptr, src->data[0] + motion_offset,
+                                            dst->linesize[0], 8);
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s, AVFrame *frame)
+{
+    return copy_from(s, s->last_frame, frame, 0, 0);
+}
+
+static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s, AVFrame *frame)
+{
+    return copy_from(s, s->second_last_frame, frame, 0, 0);
+}
+
+static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s, AVFrame *frame)
+{
+    unsigned char B;
+    int x, y;
+
+    /* copy block from 2 frames ago using a motion vector; need 1 more byte */
+    if (!s->is_16bpp) {
+        B = bytestream2_get_byte(&s->stream_ptr);
+    } else {
+        B = bytestream2_get_byte(&s->mv_ptr);
+    }
+
+    if (B < 56) {
+        x = 8 + (B % 7);
+        y = B / 7;
+    } else {
+        x = -14 + ((B - 56) % 29);
+        y =   8 + ((B - 56) / 29);
+    }
+
+    av_dlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
+    return copy_from(s, s->second_last_frame, frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s, AVFrame *frame)
+{
+    unsigned char B;
+    int x, y;
+
+    /* copy 8x8 block from current frame from an up/left block */
+
+    /* need 1 more byte for motion */
+    if (!s->is_16bpp) {
+        B = bytestream2_get_byte(&s->stream_ptr);
+    } else {
+        B = bytestream2_get_byte(&s->mv_ptr);
+    }
+
+    if (B < 56) {
+        x = -(8 + (B % 7));
+        y = -(B / 7);
+    } else {
+        x = -(-14 + ((B - 56) % 29));
+        y = -(  8 + ((B - 56) / 29));
+    }
+
+    av_dlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
+    return copy_from(s, frame, frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    unsigned char B, BL, BH;
+
+    /* copy a block from the previous frame; need 1 more byte */
+    if (!s->is_16bpp) {
+        B = bytestream2_get_byte(&s->stream_ptr);
+    } else {
+        B = bytestream2_get_byte(&s->mv_ptr);
+    }
+
+    BL = B & 0x0F;
+    BH = (B >> 4) & 0x0F;
+    x = -8 + BL;
+    y = -8 + BH;
+
+    av_dlog(s->avctx, "motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
+    return copy_from(s, s->last_frame, frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s, AVFrame *frame)
+{
+    signed char x, y;
+
+    /* copy a block from the previous frame using an expanded range;
+     * need 2 more bytes */
+    x = bytestream2_get_byte(&s->stream_ptr);
+    y = bytestream2_get_byte(&s->stream_ptr);
+
+    av_dlog(s->avctx, "motion bytes = %d, %d\n", x, y);
+    return copy_from(s, s->last_frame, frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s, AVFrame *frame)
+{
+    /* mystery opcode? skip multiple blocks? */
+    av_log(s->avctx, AV_LOG_ERROR, "Help! Mystery opcode 0x6 seen\n");
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    unsigned char P[2];
+    unsigned int flags;
+
+    /* 2-color encoding */
+    P[0] = bytestream2_get_byte(&s->stream_ptr);
+    P[1] = bytestream2_get_byte(&s->stream_ptr);
+
+    if (P[0] <= P[1]) {
+
+        /* need 8 more bytes from the stream */
+        for (y = 0; y < 8; y++) {
+            flags = bytestream2_get_byte(&s->stream_ptr) | 0x100;
+            for (; flags != 1; flags >>= 1)
+                *s->pixel_ptr++ = P[flags & 1];
+            s->pixel_ptr += s->line_inc;
+        }
+
+    } else {
+
+        /* need 2 more bytes from the stream */
+        flags = bytestream2_get_le16(&s->stream_ptr);
+        for (y = 0; y < 8; y += 2) {
+            for (x = 0; x < 8; x += 2, flags >>= 1) {
+                s->pixel_ptr[x                ] =
+                s->pixel_ptr[x + 1            ] =
+                s->pixel_ptr[x +     s->stride] =
+                s->pixel_ptr[x + 1 + s->stride] = P[flags & 1];
+            }
+            s->pixel_ptr += s->stride * 2;
+        }
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    unsigned char P[4];
+    unsigned int flags = 0;
+
+    /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
+     * either top and bottom or left and right halves */
+    P[0] = bytestream2_get_byte(&s->stream_ptr);
+    P[1] = bytestream2_get_byte(&s->stream_ptr);
+
+    if (P[0] <= P[1]) {
+        for (y = 0; y < 16; y++) {
+            // new values for each 4x4 block
+            if (!(y & 3)) {
+                if (y) {
+                    P[0]  = bytestream2_get_byte(&s->stream_ptr);
+                    P[1]  = bytestream2_get_byte(&s->stream_ptr);
+                }
+                flags = bytestream2_get_le16(&s->stream_ptr);
+            }
+
+            for (x = 0; x < 4; x++, flags >>= 1)
+                *s->pixel_ptr++ = P[flags & 1];
+            s->pixel_ptr += s->stride - 4;
+            // switch to right half
+            if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
+        }
+
+    } else {
+        flags = bytestream2_get_le32(&s->stream_ptr);
+        P[2] = bytestream2_get_byte(&s->stream_ptr);
+        P[3] = bytestream2_get_byte(&s->stream_ptr);
+
+        if (P[2] <= P[3]) {
+
+            /* vertical split; left & right halves are 2-color encoded */
+
+            for (y = 0; y < 16; y++) {
+                for (x = 0; x < 4; x++, flags >>= 1)
+                    *s->pixel_ptr++ = P[flags & 1];
+                s->pixel_ptr += s->stride - 4;
+                // switch to right half
+                if (y == 7) {
+                    s->pixel_ptr -= 8 * s->stride - 4;
+                    P[0]  = P[2];
+                    P[1]  = P[3];
+                    flags = bytestream2_get_le32(&s->stream_ptr);
+                }
+            }
+
+        } else {
+
+            /* horizontal split; top & bottom halves are 2-color encoded */
+
+            for (y = 0; y < 8; y++) {
+                if (y == 4) {
+                    P[0]  = P[2];
+                    P[1]  = P[3];
+                    flags = bytestream2_get_le32(&s->stream_ptr);
+                }
+
+                for (x = 0; x < 8; x++, flags >>= 1)
+                    *s->pixel_ptr++ = P[flags & 1];
+                s->pixel_ptr += s->line_inc;
+            }
+        }
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    unsigned char P[4];
+
+    /* 4-color encoding */
+    bytestream2_get_buffer(&s->stream_ptr, P, 4);
+
+    if (P[0] <= P[1]) {
+        if (P[2] <= P[3]) {
+
+            /* 1 of 4 colors for each pixel, need 16 more bytes */
+            for (y = 0; y < 8; y++) {
+                /* get the next set of 8 2-bit flags */
+                int flags = bytestream2_get_le16(&s->stream_ptr);
+                for (x = 0; x < 8; x++, flags >>= 2)
+                    *s->pixel_ptr++ = P[flags & 0x03];
+                s->pixel_ptr += s->line_inc;
+            }
+
+        } else {
+            uint32_t flags;
+
+            /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
+            flags = bytestream2_get_le32(&s->stream_ptr);
+
+            for (y = 0; y < 8; y += 2) {
+                for (x = 0; x < 8; x += 2, flags >>= 2) {
+                    s->pixel_ptr[x                ] =
+                    s->pixel_ptr[x + 1            ] =
+                    s->pixel_ptr[x +     s->stride] =
+                    s->pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
+                }
+                s->pixel_ptr += s->stride * 2;
+            }
+
+        }
+    } else {
+        uint64_t flags;
+
+        /* 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes */
+        flags = bytestream2_get_le64(&s->stream_ptr);
+        if (P[2] <= P[3]) {
+            for (y = 0; y < 8; y++) {
+                for (x = 0; x < 8; x += 2, flags >>= 2) {
+                    s->pixel_ptr[x    ] =
+                    s->pixel_ptr[x + 1] = P[flags & 0x03];
+                }
+                s->pixel_ptr += s->stride;
+            }
+        } else {
+            for (y = 0; y < 8; y += 2) {
+                for (x = 0; x < 8; x++, flags >>= 2) {
+                    s->pixel_ptr[x            ] =
+                    s->pixel_ptr[x + s->stride] = P[flags & 0x03];
+                }
+                s->pixel_ptr += s->stride * 2;
+            }
+        }
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    unsigned char P[8];
+    int flags = 0;
+
+    bytestream2_get_buffer(&s->stream_ptr, P, 4);
+
+    /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
+     * either top and bottom or left and right halves */
+    if (P[0] <= P[1]) {
+
+        /* 4-color encoding for each quadrant; need 32 bytes */
+        for (y = 0; y < 16; y++) {
+            // new values for each 4x4 block
+            if (!(y & 3)) {
+                if (y) bytestream2_get_buffer(&s->stream_ptr, P, 4);
+                flags = bytestream2_get_le32(&s->stream_ptr);
+            }
+
+            for (x = 0; x < 4; x++, flags >>= 2)
+                *s->pixel_ptr++ = P[flags & 0x03];
+
+            s->pixel_ptr += s->stride - 4;
+            // switch to right half
+            if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
+        }
+
+    } else {
+        // vertical split?
+        int vert;
+        uint64_t flags = bytestream2_get_le64(&s->stream_ptr);
+
+        bytestream2_get_buffer(&s->stream_ptr, P + 4, 4);
+        vert = P[4] <= P[5];
+
+        /* 4-color encoding for either left and right or top and bottom
+         * halves */
+
+        for (y = 0; y < 16; y++) {
+            for (x = 0; x < 4; x++, flags >>= 2)
+                *s->pixel_ptr++ = P[flags & 0x03];
+
+            if (vert) {
+                s->pixel_ptr += s->stride - 4;
+                // switch to right half
+                if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
+            } else if (y & 1) s->pixel_ptr += s->line_inc;
+
+            // load values for second half
+            if (y == 7) {
+                memcpy(P, P + 4, 4);
+                flags = bytestream2_get_le64(&s->stream_ptr);
+            }
+        }
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s, AVFrame *frame)
+{
+    int y;
+
+    /* 64-color encoding (each pixel in block is a different color) */
+    for (y = 0; y < 8; y++) {
+        bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8);
+        s->pixel_ptr  += s->stride;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+
+    /* 16-color block encoding: each 2x2 block is a different color */
+    for (y = 0; y < 8; y += 2) {
+        for (x = 0; x < 8; x += 2) {
+            s->pixel_ptr[x                ] =
+            s->pixel_ptr[x + 1            ] =
+            s->pixel_ptr[x +     s->stride] =
+            s->pixel_ptr[x + 1 + s->stride] = bytestream2_get_byte(&s->stream_ptr);
+        }
+        s->pixel_ptr += s->stride * 2;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s, AVFrame *frame)
+{
+    int y;
+    unsigned char P[2];
+
+    /* 4-color block encoding: each 4x4 block is a different color */
+    for (y = 0; y < 8; y++) {
+        if (!(y & 3)) {
+            P[0] = bytestream2_get_byte(&s->stream_ptr);
+            P[1] = bytestream2_get_byte(&s->stream_ptr);
+        }
+        memset(s->pixel_ptr,     P[0], 4);
+        memset(s->pixel_ptr + 4, P[1], 4);
+        s->pixel_ptr += s->stride;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s, AVFrame *frame)
+{
+    int y;
+    unsigned char pix;
+
+    /* 1-color encoding: the whole block is 1 solid color */
+    pix = bytestream2_get_byte(&s->stream_ptr);
+
+    for (y = 0; y < 8; y++) {
+        memset(s->pixel_ptr, pix, 8);
+        s->pixel_ptr += s->stride;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    unsigned char sample[2];
+
+    /* dithered encoding */
+    sample[0] = bytestream2_get_byte(&s->stream_ptr);
+    sample[1] = bytestream2_get_byte(&s->stream_ptr);
+
+    for (y = 0; y < 8; y++) {
+        for (x = 0; x < 8; x += 2) {
+            *s->pixel_ptr++ = sample[  y & 1 ];
+            *s->pixel_ptr++ = sample[!(y & 1)];
+        }
+        s->pixel_ptr += s->line_inc;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x6_16(IpvideoContext *s, AVFrame *frame)
+{
+    signed char x, y;
+
+    /* copy a block from the second last frame using an expanded range */
+    x = bytestream2_get_byte(&s->stream_ptr);
+    y = bytestream2_get_byte(&s->stream_ptr);
+
+    av_dlog(s->avctx, "motion bytes = %d, %d\n", x, y);
+    return copy_from(s, s->second_last_frame, frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x7_16(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    uint16_t P[2];
+    unsigned int flags;
+    uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
+
+    /* 2-color encoding */
+    P[0] = bytestream2_get_le16(&s->stream_ptr);
+    P[1] = bytestream2_get_le16(&s->stream_ptr);
+
+    if (!(P[0] & 0x8000)) {
+
+        for (y = 0; y < 8; y++) {
+            flags = bytestream2_get_byte(&s->stream_ptr) | 0x100;
+            for (; flags != 1; flags >>= 1)
+                *pixel_ptr++ = P[flags & 1];
+            pixel_ptr += s->line_inc;
+        }
+
+    } else {
+
+        flags = bytestream2_get_le16(&s->stream_ptr);
+        for (y = 0; y < 8; y += 2) {
+            for (x = 0; x < 8; x += 2, flags >>= 1) {
+                pixel_ptr[x                ] =
+                pixel_ptr[x + 1            ] =
+                pixel_ptr[x +     s->stride] =
+                pixel_ptr[x + 1 + s->stride] = P[flags & 1];
+            }
+            pixel_ptr += s->stride * 2;
+        }
+    }
+
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x8_16(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    uint16_t P[4];
+    unsigned int flags = 0;
+    uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
+
+    /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
+     * either top and bottom or left and right halves */
+    P[0] = bytestream2_get_le16(&s->stream_ptr);
+    P[1] = bytestream2_get_le16(&s->stream_ptr);
+
+    if (!(P[0] & 0x8000)) {
+
+        for (y = 0; y < 16; y++) {
+            // new values for each 4x4 block
+            if (!(y & 3)) {
+                if (y) {
+                    P[0] = bytestream2_get_le16(&s->stream_ptr);
+                    P[1] = bytestream2_get_le16(&s->stream_ptr);
+                }
+                flags = bytestream2_get_le16(&s->stream_ptr);
+            }
+
+            for (x = 0; x < 4; x++, flags >>= 1)
+                *pixel_ptr++ = P[flags & 1];
+            pixel_ptr += s->stride - 4;
+            // switch to right half
+            if (y == 7) pixel_ptr -= 8 * s->stride - 4;
+        }
+
+    } else {
+
+        flags = bytestream2_get_le32(&s->stream_ptr);
+        P[2]  = bytestream2_get_le16(&s->stream_ptr);
+        P[3]  = bytestream2_get_le16(&s->stream_ptr);
+
+        if (!(P[2] & 0x8000)) {
+
+            /* vertical split; left & right halves are 2-color encoded */
+
+            for (y = 0; y < 16; y++) {
+                for (x = 0; x < 4; x++, flags >>= 1)
+                    *pixel_ptr++ = P[flags & 1];
+                pixel_ptr += s->stride - 4;
+                // switch to right half
+                if (y == 7) {
+                    pixel_ptr -= 8 * s->stride - 4;
+                    P[0]  = P[2];
+                    P[1]  = P[3];
+                    flags = bytestream2_get_le32(&s->stream_ptr);
+                }
+            }
+
+        } else {
+
+            /* horizontal split; top & bottom halves are 2-color encoded */
+
+            for (y = 0; y < 8; y++) {
+                if (y == 4) {
+                    P[0]  = P[2];
+                    P[1]  = P[3];
+                    flags = bytestream2_get_le32(&s->stream_ptr);
+                }
+
+                for (x = 0; x < 8; x++, flags >>= 1)
+                    *pixel_ptr++ = P[flags & 1];
+                pixel_ptr += s->line_inc;
+            }
+        }
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x9_16(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    uint16_t P[4];
+    uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
+
+    /* 4-color encoding */
+    for (x = 0; x < 4; x++)
+        P[x] = bytestream2_get_le16(&s->stream_ptr);
+
+    if (!(P[0] & 0x8000)) {
+        if (!(P[2] & 0x8000)) {
+
+            /* 1 of 4 colors for each pixel */
+            for (y = 0; y < 8; y++) {
+                /* get the next set of 8 2-bit flags */
+                int flags = bytestream2_get_le16(&s->stream_ptr);
+                for (x = 0; x < 8; x++, flags >>= 2)
+                    *pixel_ptr++ = P[flags & 0x03];
+                pixel_ptr += s->line_inc;
+            }
+
+        } else {
+            uint32_t flags;
+
+            /* 1 of 4 colors for each 2x2 block */
+            flags = bytestream2_get_le32(&s->stream_ptr);
+
+            for (y = 0; y < 8; y += 2) {
+                for (x = 0; x < 8; x += 2, flags >>= 2) {
+                    pixel_ptr[x                ] =
+                    pixel_ptr[x + 1            ] =
+                    pixel_ptr[x +     s->stride] =
+                    pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
+                }
+                pixel_ptr += s->stride * 2;
+            }
+
+        }
+    } else {
+        uint64_t flags;
+
+        /* 1 of 4 colors for each 2x1 or 1x2 block */
+        flags = bytestream2_get_le64(&s->stream_ptr);
+        if (!(P[2] & 0x8000)) {
+            for (y = 0; y < 8; y++) {
+                for (x = 0; x < 8; x += 2, flags >>= 2) {
+                    pixel_ptr[x    ] =
+                    pixel_ptr[x + 1] = P[flags & 0x03];
+                }
+                pixel_ptr += s->stride;
+            }
+        } else {
+            for (y = 0; y < 8; y += 2) {
+                for (x = 0; x < 8; x++, flags >>= 2) {
+                    pixel_ptr[x            ] =
+                    pixel_ptr[x + s->stride] = P[flags & 0x03];
+                }
+                pixel_ptr += s->stride * 2;
+            }
+        }
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xA_16(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    uint16_t P[8];
+    int flags = 0;
+    uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
+
+    for (x = 0; x < 4; x++)
+        P[x] = bytestream2_get_le16(&s->stream_ptr);
+
+    /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
+     * either top and bottom or left and right halves */
+    if (!(P[0] & 0x8000)) {
+
+        /* 4-color encoding for each quadrant */
+        for (y = 0; y < 16; y++) {
+            // new values for each 4x4 block
+            if (!(y & 3)) {
+                if (y)
+                    for (x = 0; x < 4; x++)
+                        P[x] = bytestream2_get_le16(&s->stream_ptr);
+                flags = bytestream2_get_le32(&s->stream_ptr);
+            }
+
+            for (x = 0; x < 4; x++, flags >>= 2)
+                *pixel_ptr++ = P[flags & 0x03];
+
+            pixel_ptr += s->stride - 4;
+            // switch to right half
+            if (y == 7) pixel_ptr -= 8 * s->stride - 4;
+        }
+
+    } else {
+        // vertical split?
+        int vert;
+        uint64_t flags = bytestream2_get_le64(&s->stream_ptr);
+
+        for (x = 4; x < 8; x++)
+            P[x] = bytestream2_get_le16(&s->stream_ptr);
+        vert = !(P[4] & 0x8000);
+
+        /* 4-color encoding for either left and right or top and bottom
+         * halves */
+
+        for (y = 0; y < 16; y++) {
+            for (x = 0; x < 4; x++, flags >>= 2)
+                *pixel_ptr++ = P[flags & 0x03];
+
+            if (vert) {
+                pixel_ptr += s->stride - 4;
+                // switch to right half
+                if (y == 7) pixel_ptr -= 8 * s->stride - 4;
+            } else if (y & 1) pixel_ptr += s->line_inc;
+
+            // load values for second half
+            if (y == 7) {
+                memcpy(P, P + 4, 8);
+                flags = bytestream2_get_le64(&s->stream_ptr);
+            }
+        }
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xB_16(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
+
+    /* 64-color encoding (each pixel in block is a different color) */
+    for (y = 0; y < 8; y++) {
+        for (x = 0; x < 8; x++)
+            pixel_ptr[x] = bytestream2_get_le16(&s->stream_ptr);
+        pixel_ptr  += s->stride;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xC_16(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
+
+    /* 16-color block encoding: each 2x2 block is a different color */
+    for (y = 0; y < 8; y += 2) {
+        for (x = 0; x < 8; x += 2) {
+            pixel_ptr[x                ] =
+            pixel_ptr[x + 1            ] =
+            pixel_ptr[x +     s->stride] =
+            pixel_ptr[x + 1 + s->stride] = bytestream2_get_le16(&s->stream_ptr);
+        }
+        pixel_ptr += s->stride * 2;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xD_16(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    uint16_t P[2];
+    uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
+
+    /* 4-color block encoding: each 4x4 block is a different color */
+    for (y = 0; y < 8; y++) {
+        if (!(y & 3)) {
+            P[0] = bytestream2_get_le16(&s->stream_ptr);
+            P[1] = bytestream2_get_le16(&s->stream_ptr);
+        }
+        for (x = 0; x < 8; x++)
+            pixel_ptr[x] = P[x >> 2];
+        pixel_ptr += s->stride;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xE_16(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    uint16_t pix;
+    uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr;
+
+    /* 1-color encoding: the whole block is 1 solid color */
+    pix = bytestream2_get_le16(&s->stream_ptr);
+
+    for (y = 0; y < 8; y++) {
+        for (x = 0; x < 8; x++)
+            pixel_ptr[x] = pix;
+        pixel_ptr += s->stride;
+    }
+
+    /* report success */
+    return 0;
+}
+
+static int (* const ipvideo_decode_block[])(IpvideoContext *s, AVFrame *frame) = {
+    ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
+    ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
+    ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
+    ipvideo_decode_block_opcode_0x6, ipvideo_decode_block_opcode_0x7,
+    ipvideo_decode_block_opcode_0x8, ipvideo_decode_block_opcode_0x9,
+    ipvideo_decode_block_opcode_0xA, ipvideo_decode_block_opcode_0xB,
+    ipvideo_decode_block_opcode_0xC, ipvideo_decode_block_opcode_0xD,
+    ipvideo_decode_block_opcode_0xE, ipvideo_decode_block_opcode_0xF,
+};
+
+static int (* const ipvideo_decode_block16[])(IpvideoContext *s, AVFrame *frame) = {
+    ipvideo_decode_block_opcode_0x0,    ipvideo_decode_block_opcode_0x1,
+    ipvideo_decode_block_opcode_0x2,    ipvideo_decode_block_opcode_0x3,
+    ipvideo_decode_block_opcode_0x4,    ipvideo_decode_block_opcode_0x5,
+    ipvideo_decode_block_opcode_0x6_16, ipvideo_decode_block_opcode_0x7_16,
+    ipvideo_decode_block_opcode_0x8_16, ipvideo_decode_block_opcode_0x9_16,
+    ipvideo_decode_block_opcode_0xA_16, ipvideo_decode_block_opcode_0xB_16,
+    ipvideo_decode_block_opcode_0xC_16, ipvideo_decode_block_opcode_0xD_16,
+    ipvideo_decode_block_opcode_0xE_16, ipvideo_decode_block_opcode_0x1,
+};
+
+static void ipvideo_decode_opcodes(IpvideoContext *s, AVFrame *frame)
+{
+    int x, y;
+    unsigned char opcode;
+    int ret;
+    GetBitContext gb;
+
+    bytestream2_skip(&s->stream_ptr, 14); /* data starts 14 bytes in */
+    if (!s->is_16bpp) {
+        /* this is PAL8, so make the palette available */
+        memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
+
+        s->stride = frame->linesize[0];
+    } else {
+        s->stride = frame->linesize[0] >> 1;
+        s->mv_ptr = s->stream_ptr;
+        bytestream2_skip(&s->mv_ptr, bytestream2_get_le16(&s->stream_ptr));
+    }
+    s->line_inc = s->stride - 8;
+    s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0]
+                                  + (s->avctx->width - 8) * (1 + s->is_16bpp);
+
+    init_get_bits(&gb, s->decoding_map, s->decoding_map_size * 8);
+    for (y = 0; y < s->avctx->height; y += 8) {
+        for (x = 0; x < s->avctx->width; x += 8) {
+            opcode = get_bits(&gb, 4);
+
+            av_dlog(s->avctx,
+                    "  block @ (%3d, %3d): encoding 0x%X, data ptr offset %d\n",
+                    x, y, opcode, bytestream2_tell(&s->stream_ptr));
+
+            if (!s->is_16bpp) {
+                s->pixel_ptr = frame->data[0] + x
+                              + y*frame->linesize[0];
+                ret = ipvideo_decode_block[opcode](s, frame);
+            } else {
+                s->pixel_ptr = frame->data[0] + x*2
+                              + y*frame->linesize[0];
+                ret = ipvideo_decode_block16[opcode](s, frame);
+            }
+            if (ret != 0) {
+                av_log(s->avctx, AV_LOG_ERROR, "decode problem on frame %d, @ block (%d, %d)\n",
+                       s->avctx->frame_number, x, y);
+                return;
+            }
+        }
+    }
+    if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {
+        av_log(s->avctx, AV_LOG_ERROR,
+               "decode finished with %d bytes left over\n",
+               bytestream2_get_bytes_left(&s->stream_ptr));
+    }
+}
+
+static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
+{
+    IpvideoContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+
+    s->is_16bpp = avctx->bits_per_coded_sample == 16;
+    avctx->pix_fmt = s->is_16bpp ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_PAL8;
+
+    ff_hpeldsp_init(&s->hdsp, avctx->flags);
+
+    s->last_frame        = av_frame_alloc();
+    s->second_last_frame = av_frame_alloc();
+    if (!s->last_frame || !s->second_last_frame) {
+        av_frame_free(&s->last_frame);
+        av_frame_free(&s->second_last_frame);
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static int ipvideo_decode_frame(AVCodecContext *avctx,
+                                void *data, int *got_frame,
+                                AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    IpvideoContext *s = avctx->priv_data;
+    AVFrame *frame = data;
+    int ret;
+
+    /* decoding map contains 4 bits of information per 8x8 block */
+    s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
+
+    /* 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;
+
+    if (av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, NULL)) {
+        av_frame_unref(s->last_frame);
+        av_frame_unref(s->second_last_frame);
+    }
+
+    s->decoding_map = buf;
+    bytestream2_init(&s->stream_ptr, buf + s->decoding_map_size,
+                     buf_size - s->decoding_map_size);
+
+    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
+        return ret;
+
+    if (!s->is_16bpp) {
+        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+        if (pal) {
+            frame->palette_has_changed = 1;
+            memcpy(s->pal, pal, AVPALETTE_SIZE);
+        }
+    }
+
+    ipvideo_decode_opcodes(s, frame);
+
+    *got_frame = 1;
+
+    /* shuffle frames */
+    av_frame_unref(s->second_last_frame);
+    FFSWAP(AVFrame*, s->second_last_frame, s->last_frame);
+    if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
+        return ret;
+
+    /* report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
+{
+    IpvideoContext *s = avctx->priv_data;
+
+    av_frame_free(&s->last_frame);
+    av_frame_free(&s->second_last_frame);
+
+    return 0;
+}
+
+AVCodec ff_interplay_video_decoder = {
+    .name           = "interplayvideo",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_INTERPLAY_VIDEO,
+    .priv_data_size = sizeof(IpvideoContext),
+    .init           = ipvideo_decode_init,
+    .close          = ipvideo_decode_end,
+    .decode         = ipvideo_decode_frame,
+    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_PARAM_CHANGE,
+    .long_name      = NULL_IF_CONFIG_SMALL("Interplay MVE video"),
+};