adding ffmpeg specific version

1 files changed, 1138 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/indeo3.c b/ffmpeg1/libavcodec/indeo3.c
new file mode 100644
index 0000000..a8b6e64
--- /dev/null
+++ b/ffmpeg1/libavcodec/indeo3.c
@@ -0,0 +1,1138 @@
+/*
+ * Indeo Video v3 compatible decoder
+ * Copyright (c) 2009 - 2011 Maxim Poliakovski
+ *
+ * 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
+ * This is a decoder for Intel Indeo Video v3.
+ * It is based on vector quantization, run-length coding and motion compensation.
+ * Known container formats: .avi and .mov
+ * Known FOURCCs: 'IV31', 'IV32'
+ *
+ * @see http://wiki.multimedia.cx/index.php?title=Indeo_3
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "copy_block.h"
+#include "bytestream.h"
+#include "get_bits.h"
+#include "hpeldsp.h"
+#include "internal.h"
+
+#include "indeo3data.h"
+
+/* RLE opcodes. */
+enum {
+    RLE_ESC_F9    = 249, ///< same as RLE_ESC_FA + do the same with next block
+    RLE_ESC_FA    = 250, ///< INTRA: skip block, INTER: copy data from reference
+    RLE_ESC_FB    = 251, ///< apply null delta to N blocks / skip N blocks
+    RLE_ESC_FC    = 252, ///< same as RLE_ESC_FD + do the same with next block
+    RLE_ESC_FD    = 253, ///< apply null delta to all remaining lines of this block
+    RLE_ESC_FE    = 254, ///< apply null delta to all lines up to the 3rd line
+    RLE_ESC_FF    = 255  ///< apply null delta to all lines up to the 2nd line
+};
+
+
+/* Some constants for parsing frame bitstream flags. */
+#define BS_8BIT_PEL     (1 << 1) ///< 8bit pixel bitdepth indicator
+#define BS_KEYFRAME     (1 << 2) ///< intra frame indicator
+#define BS_MV_Y_HALF    (1 << 4) ///< vertical mv halfpel resolution indicator
+#define BS_MV_X_HALF    (1 << 5) ///< horizontal mv halfpel resolution indicator
+#define BS_NONREF       (1 << 8) ///< nonref (discardable) frame indicator
+#define BS_BUFFER        9       ///< indicates which of two frame buffers should be used
+
+
+typedef struct Plane {
+    uint8_t         *buffers[2];
+    uint8_t         *pixels[2]; ///< pointer to the actual pixel data of the buffers above
+    uint32_t        width;
+    uint32_t        height;
+    uint32_t        pitch;
+} Plane;
+
+#define CELL_STACK_MAX  20
+
+typedef struct Cell {
+    int16_t         xpos;       ///< cell coordinates in 4x4 blocks
+    int16_t         ypos;
+    int16_t         width;      ///< cell width  in 4x4 blocks
+    int16_t         height;     ///< cell height in 4x4 blocks
+    uint8_t         tree;       ///< tree id: 0- MC tree, 1 - VQ tree
+    const int8_t    *mv_ptr;    ///< ptr to the motion vector if any
+} Cell;
+
+typedef struct Indeo3DecodeContext {
+    AVCodecContext *avctx;
+    HpelDSPContext  hdsp;
+
+    GetBitContext   gb;
+    int             need_resync;
+    int             skip_bits;
+    const uint8_t   *next_cell_data;
+    const uint8_t   *last_byte;
+    const int8_t    *mc_vectors;
+    unsigned        num_vectors;    ///< number of motion vectors in mc_vectors
+
+    int16_t         width, height;
+    uint32_t        frame_num;      ///< current frame number (zero-based)
+    uint32_t        data_size;      ///< size of the frame data in bytes
+    uint16_t        frame_flags;    ///< frame properties
+    uint8_t         cb_offset;      ///< needed for selecting VQ tables
+    uint8_t         buf_sel;        ///< active frame buffer: 0 - primary, 1 -secondary
+    const uint8_t   *y_data_ptr;
+    const uint8_t   *v_data_ptr;
+    const uint8_t   *u_data_ptr;
+    int32_t         y_data_size;
+    int32_t         v_data_size;
+    int32_t         u_data_size;
+    const uint8_t   *alt_quant;     ///< secondary VQ table set for the modes 1 and 4
+    Plane           planes[3];
+} Indeo3DecodeContext;
+
+
+static uint8_t requant_tab[8][128];
+
+/*
+ *  Build the static requantization table.
+ *  This table is used to remap pixel values according to a specific
+ *  quant index and thus avoid overflows while adding deltas.
+ */
+static av_cold void build_requant_tab(void)
+{
+    static int8_t offsets[8] = { 1, 1, 2, -3, -3, 3, 4, 4 };
+    static int8_t deltas [8] = { 0, 1, 0,  4,  4, 1, 0, 1 };
+
+    int i, j, step;
+
+    for (i = 0; i < 8; i++) {
+        step = i + 2;
+        for (j = 0; j < 128; j++)
+                requant_tab[i][j] = (j + offsets[i]) / step * step + deltas[i];
+    }
+
+    /* some last elements calculated above will have values >= 128 */
+    /* pixel values shall never exceed 127 so set them to non-overflowing values */
+    /* according with the quantization step of the respective section */
+    requant_tab[0][127] = 126;
+    requant_tab[1][119] = 118;
+    requant_tab[1][120] = 118;
+    requant_tab[2][126] = 124;
+    requant_tab[2][127] = 124;
+    requant_tab[6][124] = 120;
+    requant_tab[6][125] = 120;
+    requant_tab[6][126] = 120;
+    requant_tab[6][127] = 120;
+
+    /* Patch for compatibility with the Intel's binary decoders */
+    requant_tab[1][7] = 10;
+    requant_tab[4][8] = 10;
+}
+
+
+static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,
+                                          AVCodecContext *avctx, int luma_width, int luma_height)
+{
+    int p, chroma_width, chroma_height;
+    int luma_pitch, chroma_pitch, luma_size, chroma_size;
+
+    if (luma_width  < 16 || luma_width  > 640 ||
+        luma_height < 16 || luma_height > 480 ||
+        luma_width  &  3 || luma_height &   3) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid picture dimensions: %d x %d!\n",
+               luma_width, luma_height);
+        return AVERROR_INVALIDDATA;
+    }
+
+    ctx->width  = luma_width ;
+    ctx->height = luma_height;
+
+    chroma_width  = FFALIGN(luma_width  >> 2, 4);
+    chroma_height = FFALIGN(luma_height >> 2, 4);
+
+    luma_pitch   = FFALIGN(luma_width,   16);
+    chroma_pitch = FFALIGN(chroma_width, 16);
+
+    /* Calculate size of the luminance plane.  */
+    /* Add one line more for INTRA prediction. */
+    luma_size = luma_pitch * (luma_height + 1);
+
+    /* Calculate size of a chrominance planes. */
+    /* Add one line more for INTRA prediction. */
+    chroma_size = chroma_pitch * (chroma_height + 1);
+
+    /* allocate frame buffers */
+    for (p = 0; p < 3; p++) {
+        ctx->planes[p].pitch  = !p ? luma_pitch  : chroma_pitch;
+        ctx->planes[p].width  = !p ? luma_width  : chroma_width;
+        ctx->planes[p].height = !p ? luma_height : chroma_height;
+
+        ctx->planes[p].buffers[0] = av_malloc(!p ? luma_size : chroma_size);
+        ctx->planes[p].buffers[1] = av_malloc(!p ? luma_size : chroma_size);
+
+        /* fill the INTRA prediction lines with the middle pixel value = 64 */
+        memset(ctx->planes[p].buffers[0], 0x40, ctx->planes[p].pitch);
+        memset(ctx->planes[p].buffers[1], 0x40, ctx->planes[p].pitch);
+
+        /* set buffer pointers = buf_ptr + pitch and thus skip the INTRA prediction line */
+        ctx->planes[p].pixels[0] = ctx->planes[p].buffers[0] + ctx->planes[p].pitch;
+        ctx->planes[p].pixels[1] = ctx->planes[p].buffers[1] + ctx->planes[p].pitch;
+        memset(ctx->planes[p].pixels[0], 0, ctx->planes[p].pitch * ctx->planes[p].height);
+        memset(ctx->planes[p].pixels[1], 0, ctx->planes[p].pitch * ctx->planes[p].height);
+    }
+
+    return 0;
+}
+
+
+static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)
+{
+    int p;
+
+    ctx->width=
+    ctx->height= 0;
+
+    for (p = 0; p < 3; p++) {
+        av_freep(&ctx->planes[p].buffers[0]);
+        av_freep(&ctx->planes[p].buffers[1]);
+        ctx->planes[p].pixels[0] = ctx->planes[p].pixels[1] = 0;
+    }
+}
+
+
+/**
+ *  Copy pixels of the cell(x + mv_x, y + mv_y) from the previous frame into
+ *  the cell(x, y) in the current frame.
+ *
+ *  @param ctx      pointer to the decoder context
+ *  @param plane    pointer to the plane descriptor
+ *  @param cell     pointer to the cell  descriptor
+ */
+static void copy_cell(Indeo3DecodeContext *ctx, Plane *plane, Cell *cell)
+{
+    int     h, w, mv_x, mv_y, offset, offset_dst;
+    uint8_t *src, *dst;
+
+    /* setup output and reference pointers */
+    offset_dst  = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
+    dst         = plane->pixels[ctx->buf_sel] + offset_dst;
+    if(cell->mv_ptr){
+    mv_y        = cell->mv_ptr[0];
+    mv_x        = cell->mv_ptr[1];
+    }else
+        mv_x= mv_y= 0;
+    offset      = offset_dst + mv_y * plane->pitch + mv_x;
+    src         = plane->pixels[ctx->buf_sel ^ 1] + offset;
+
+    h = cell->height << 2;
+
+    for (w = cell->width; w > 0;) {
+        /* copy using 16xH blocks */
+        if (!((cell->xpos << 2) & 15) && w >= 4) {
+            for (; w >= 4; src += 16, dst += 16, w -= 4)
+                ctx->hdsp.put_no_rnd_pixels_tab[0][0](dst, src, plane->pitch, h);
+        }
+
+        /* copy using 8xH blocks */
+        if (!((cell->xpos << 2) & 7) && w >= 2) {
+            ctx->hdsp.put_no_rnd_pixels_tab[1][0](dst, src, plane->pitch, h);
+            w -= 2;
+            src += 8;
+            dst += 8;
+        }
+
+        if (w >= 1) {
+            copy_block4(dst, src, plane->pitch, plane->pitch, h);
+            w--;
+            src += 4;
+            dst += 4;
+        }
+    }
+}
+
+
+/* Average 4/8 pixels at once without rounding using SWAR */
+#define AVG_32(dst, src, ref) \
+    AV_WN32A(dst, ((AV_RN32A(src) + AV_RN32A(ref)) >> 1) & 0x7F7F7F7FUL)
+
+#define AVG_64(dst, src, ref) \
+    AV_WN64A(dst, ((AV_RN64A(src) + AV_RN64A(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)
+
+
+/*
+ *  Replicate each even pixel as follows:
+ *  ABCDEFGH -> AACCEEGG
+ */
+static inline uint64_t replicate64(uint64_t a) {
+#if HAVE_BIGENDIAN
+    a &= 0xFF00FF00FF00FF00ULL;
+    a |= a >> 8;
+#else
+    a &= 0x00FF00FF00FF00FFULL;
+    a |= a << 8;
+#endif
+    return a;
+}
+
+static inline uint32_t replicate32(uint32_t a) {
+#if HAVE_BIGENDIAN
+    a &= 0xFF00FF00UL;
+    a |= a >> 8;
+#else
+    a &= 0x00FF00FFUL;
+    a |= a << 8;
+#endif
+    return a;
+}
+
+
+/* Fill n lines with 64bit pixel value pix */
+static inline void fill_64(uint8_t *dst, const uint64_t pix, int32_t n,
+                           int32_t row_offset)
+{
+    for (; n > 0; dst += row_offset, n--)
+        AV_WN64A(dst, pix);
+}
+
+
+/* Error codes for cell decoding. */
+enum {
+    IV3_NOERR       = 0,
+    IV3_BAD_RLE     = 1,
+    IV3_BAD_DATA    = 2,
+    IV3_BAD_COUNTER = 3,
+    IV3_UNSUPPORTED = 4,
+    IV3_OUT_OF_DATA = 5
+};
+
+
+#define BUFFER_PRECHECK \
+if (*data_ptr >= last_ptr) \
+    return IV3_OUT_OF_DATA; \
+
+#define RLE_BLOCK_COPY \
+    if (cell->mv_ptr || !skip_flag) \
+        copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom)
+
+#define RLE_BLOCK_COPY_8 \
+    pix64 = AV_RN64A(ref);\
+    if (is_first_row) {/* special prediction case: top line of a cell */\
+        pix64 = replicate64(pix64);\
+        fill_64(dst + row_offset, pix64, 7, row_offset);\
+        AVG_64(dst, ref, dst + row_offset);\
+    } else \
+        fill_64(dst, pix64, 8, row_offset)
+
+#define RLE_LINES_COPY \
+    copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom)
+
+#define RLE_LINES_COPY_M10 \
+    pix64 = AV_RN64A(ref);\
+    if (is_top_of_cell) {\
+        pix64 = replicate64(pix64);\
+        fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\
+        AVG_64(dst, ref, dst + row_offset);\
+    } else \
+        fill_64(dst, pix64, num_lines << 1, row_offset)
+
+#define APPLY_DELTA_4 \
+    AV_WN16A(dst + line_offset    ,\
+             (AV_RN16A(ref    ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
+    AV_WN16A(dst + line_offset + 2,\
+             (AV_RN16A(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
+    if (mode >= 3) {\
+        if (is_top_of_cell && !cell->ypos) {\
+            AV_COPY32(dst, dst + row_offset);\
+        } else {\
+            AVG_32(dst, ref, dst + row_offset);\
+        }\
+    }
+
+#define APPLY_DELTA_8 \
+    /* apply two 32-bit VQ deltas to next even line */\
+    if (is_top_of_cell) { \
+        AV_WN32A(dst + row_offset    , \
+                 (replicate32(AV_RN32A(ref    )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
+        AV_WN32A(dst + row_offset + 4, \
+                 (replicate32(AV_RN32A(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
+    } else { \
+        AV_WN32A(dst + row_offset    , \
+                 (AV_RN32A(ref    ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
+        AV_WN32A(dst + row_offset + 4, \
+                 (AV_RN32A(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
+    } \
+    /* odd lines are not coded but rather interpolated/replicated */\
+    /* first line of the cell on the top of image? - replicate */\
+    /* otherwise - interpolate */\
+    if (is_top_of_cell && !cell->ypos) {\
+        AV_COPY64(dst, dst + row_offset);\
+    } else \
+        AVG_64(dst, ref, dst + row_offset);
+
+
+#define APPLY_DELTA_1011_INTER \
+    if (mode == 10) { \
+        AV_WN32A(dst                 , \
+                 (AV_RN32A(dst                 ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
+        AV_WN32A(dst + 4             , \
+                 (AV_RN32A(dst + 4             ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
+        AV_WN32A(dst + row_offset    , \
+                 (AV_RN32A(dst + row_offset    ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
+        AV_WN32A(dst + row_offset + 4, \
+                 (AV_RN32A(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
+    } else { \
+        AV_WN16A(dst                 , \
+                 (AV_RN16A(dst                 ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
+        AV_WN16A(dst + 2             , \
+                 (AV_RN16A(dst + 2             ) + delta_tab->deltas[dyad2]) & 0x7F7F);\
+        AV_WN16A(dst + row_offset    , \
+                 (AV_RN16A(dst + row_offset    ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
+        AV_WN16A(dst + row_offset + 2, \
+                 (AV_RN16A(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
+    }
+
+
+static int decode_cell_data(Indeo3DecodeContext *ctx, Cell *cell,
+                            uint8_t *block, uint8_t *ref_block,
+                            int pitch, int h_zoom, int v_zoom, int mode,
+                            const vqEntry *delta[2], int swap_quads[2],
+                            const uint8_t **data_ptr, const uint8_t *last_ptr)
+{
+    int           x, y, line, num_lines;
+    int           rle_blocks = 0;
+    uint8_t       code, *dst, *ref;
+    const vqEntry *delta_tab;
+    unsigned int  dyad1, dyad2;
+    uint64_t      pix64;
+    int           skip_flag = 0, is_top_of_cell, is_first_row = 1;
+    int           row_offset, blk_row_offset, line_offset;
+
+    row_offset     =  pitch;
+    blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2);
+    line_offset    = v_zoom ? row_offset : 0;
+
+    if (cell->height & v_zoom || cell->width & h_zoom)
+        return IV3_BAD_DATA;
+
+    for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) {
+        for (x = 0; x < cell->width; x += 1 + h_zoom) {
+            ref = ref_block;
+            dst = block;
+
+            if (rle_blocks > 0) {
+                if (mode <= 4) {
+                    RLE_BLOCK_COPY;
+                } else if (mode == 10 && !cell->mv_ptr) {
+                    RLE_BLOCK_COPY_8;
+                }
+                rle_blocks--;
+            } else {
+                for (line = 0; line < 4;) {
+                    num_lines = 1;
+                    is_top_of_cell = is_first_row && !line;
+
+                    /* select primary VQ table for odd, secondary for even lines */
+                    if (mode <= 4)
+                        delta_tab = delta[line & 1];
+                    else
+                        delta_tab = delta[1];
+                    BUFFER_PRECHECK;
+                    code = bytestream_get_byte(data_ptr);
+                    if (code < 248) {
+                        if (code < delta_tab->num_dyads) {
+                            BUFFER_PRECHECK;
+                            dyad1 = bytestream_get_byte(data_ptr);
+                            dyad2 = code;
+                            if (dyad1 >= delta_tab->num_dyads || dyad1 >= 248)
+                                return IV3_BAD_DATA;
+                        } else {
+                            /* process QUADS */
+                            code -= delta_tab->num_dyads;
+                            dyad1 = code / delta_tab->quad_exp;
+                            dyad2 = code % delta_tab->quad_exp;
+                            if (swap_quads[line & 1])
+                                FFSWAP(unsigned int, dyad1, dyad2);
+                        }
+                        if (mode <= 4) {
+                            APPLY_DELTA_4;
+                        } else if (mode == 10 && !cell->mv_ptr) {
+                            APPLY_DELTA_8;
+                        } else {
+                            APPLY_DELTA_1011_INTER;
+                        }
+                    } else {
+                        /* process RLE codes */
+                        switch (code) {
+                        case RLE_ESC_FC:
+                            skip_flag  = 0;
+                            rle_blocks = 1;
+                            code       = 253;
+                            /* FALLTHROUGH */
+                        case RLE_ESC_FF:
+                        case RLE_ESC_FE:
+                        case RLE_ESC_FD:
+                            num_lines = 257 - code - line;
+                            if (num_lines <= 0)
+                                return IV3_BAD_RLE;
+                            if (mode <= 4) {
+                                RLE_LINES_COPY;
+                            } else if (mode == 10 && !cell->mv_ptr) {
+                                RLE_LINES_COPY_M10;
+                            }
+                            break;
+                        case RLE_ESC_FB:
+                            BUFFER_PRECHECK;
+                            code = bytestream_get_byte(data_ptr);
+                            rle_blocks = (code & 0x1F) - 1; /* set block counter */
+                            if (code >= 64 || rle_blocks < 0)
+                                return IV3_BAD_COUNTER;
+                            skip_flag = code & 0x20;
+                            num_lines = 4 - line; /* enforce next block processing */
+                            if (mode >= 10 || (cell->mv_ptr || !skip_flag)) {
+                                if (mode <= 4) {
+                                    RLE_LINES_COPY;
+                                } else if (mode == 10 && !cell->mv_ptr) {
+                                    RLE_LINES_COPY_M10;
+                                }
+                            }
+                            break;
+                        case RLE_ESC_F9:
+                            skip_flag  = 1;
+                            rle_blocks = 1;
+                            /* FALLTHROUGH */
+                        case RLE_ESC_FA:
+                            if (line)
+                                return IV3_BAD_RLE;
+                            num_lines = 4; /* enforce next block processing */
+                            if (cell->mv_ptr) {
+                                if (mode <= 4) {
+                                    RLE_LINES_COPY;
+                                } else if (mode == 10 && !cell->mv_ptr) {
+                                    RLE_LINES_COPY_M10;
+                                }
+                            }
+                            break;
+                        default:
+                            return IV3_UNSUPPORTED;
+                        }
+                    }
+
+                    line += num_lines;
+                    ref  += row_offset * (num_lines << v_zoom);
+                    dst  += row_offset * (num_lines << v_zoom);
+                }
+            }
+
+            /* move to next horizontal block */
+            block     += 4 << h_zoom;
+            ref_block += 4 << h_zoom;
+        }
+
+        /* move to next line of blocks */
+        ref_block += blk_row_offset;
+        block     += blk_row_offset;
+    }
+    return IV3_NOERR;
+}
+
+
+/**
+ *  Decode a vector-quantized cell.
+ *  It consists of several routines, each of which handles one or more "modes"
+ *  with which a cell can be encoded.
+ *
+ *  @param ctx      pointer to the decoder context
+ *  @param avctx    ptr to the AVCodecContext
+ *  @param plane    pointer to the plane descriptor
+ *  @param cell     pointer to the cell  descriptor
+ *  @param data_ptr pointer to the compressed data
+ *  @param last_ptr pointer to the last byte to catch reads past end of buffer
+ *  @return         number of consumed bytes or negative number in case of error
+ */
+static int decode_cell(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
+                       Plane *plane, Cell *cell, const uint8_t *data_ptr,
+                       const uint8_t *last_ptr)
+{
+    int           x, mv_x, mv_y, mode, vq_index, prim_indx, second_indx;
+    int           zoom_fac;
+    int           offset, error = 0, swap_quads[2];
+    uint8_t       code, *block, *ref_block = 0;
+    const vqEntry *delta[2];
+    const uint8_t *data_start = data_ptr;
+
+    /* get coding mode and VQ table index from the VQ descriptor byte */
+    code     = *data_ptr++;
+    mode     = code >> 4;
+    vq_index = code & 0xF;
+
+    /* setup output and reference pointers */
+    offset = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
+    block  =  plane->pixels[ctx->buf_sel] + offset;
+
+    if (cell->mv_ptr) {
+        mv_y      = cell->mv_ptr[0];
+        mv_x      = cell->mv_ptr[1];
+        if (   mv_x + 4*cell->xpos < 0
+            || mv_y + 4*cell->ypos < 0
+            || mv_x + 4*cell->xpos + 4*cell->width  > plane->width
+            || mv_y + 4*cell->ypos + 4*cell->height > plane->height) {
+            av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", mv_x + 4*cell->xpos, mv_y + 4*cell->ypos);
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    if (!cell->mv_ptr) {
+        /* use previous line as reference for INTRA cells */
+        ref_block = block - plane->pitch;
+    } else if (mode >= 10) {
+        /* for mode 10 and 11 INTER first copy the predicted cell into the current one */
+        /* so we don't need to do data copying for each RLE code later */
+        copy_cell(ctx, plane, cell);
+    } else {
+        /* set the pointer to the reference pixels for modes 0-4 INTER */
+        mv_y      = cell->mv_ptr[0];
+        mv_x      = cell->mv_ptr[1];
+        offset   += mv_y * plane->pitch + mv_x;
+        ref_block = plane->pixels[ctx->buf_sel ^ 1] + offset;
+    }
+
+    /* select VQ tables as follows: */
+    /* modes 0 and 3 use only the primary table for all lines in a block */
+    /* while modes 1 and 4 switch between primary and secondary tables on alternate lines */
+    if (mode == 1 || mode == 4) {
+        code        = ctx->alt_quant[vq_index];
+        prim_indx   = (code >> 4)  + ctx->cb_offset;
+        second_indx = (code & 0xF) + ctx->cb_offset;
+    } else {
+        vq_index += ctx->cb_offset;
+        prim_indx = second_indx = vq_index;
+    }
+
+    if (prim_indx >= 24 || second_indx >= 24) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid VQ table indexes! Primary: %d, secondary: %d!\n",
+               prim_indx, second_indx);
+        return AVERROR_INVALIDDATA;
+    }
+
+    delta[0] = &vq_tab[second_indx];
+    delta[1] = &vq_tab[prim_indx];
+    swap_quads[0] = second_indx >= 16;
+    swap_quads[1] = prim_indx   >= 16;
+
+    /* requantize the prediction if VQ index of this cell differs from VQ index */
+    /* of the predicted cell in order to avoid overflows. */
+    if (vq_index >= 8 && ref_block) {
+        for (x = 0; x < cell->width << 2; x++)
+            ref_block[x] = requant_tab[vq_index & 7][ref_block[x] & 127];
+    }
+
+    error = IV3_NOERR;
+
+    switch (mode) {
+    case 0: /*------------------ MODES 0 & 1 (4x4 block processing) --------------------*/
+    case 1:
+    case 3: /*------------------ MODES 3 & 4 (4x8 block processing) --------------------*/
+    case 4:
+        if (mode >= 3 && cell->mv_ptr) {
+            av_log(avctx, AV_LOG_ERROR, "Attempt to apply Mode 3/4 to an INTER cell!\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        zoom_fac = mode >= 3;
+        error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch,
+                                 0, zoom_fac, mode, delta, swap_quads,
+                                 &data_ptr, last_ptr);
+        break;
+    case 10: /*-------------------- MODE 10 (8x8 block processing) ---------------------*/
+    case 11: /*----------------- MODE 11 (4x8 INTER block processing) ------------------*/
+        if (mode == 10 && !cell->mv_ptr) { /* MODE 10 INTRA processing */
+            error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch,
+                                     1, 1, mode, delta, swap_quads,
+                                     &data_ptr, last_ptr);
+        } else { /* mode 10 and 11 INTER processing */
+            if (mode == 11 && !cell->mv_ptr) {
+               av_log(avctx, AV_LOG_ERROR, "Attempt to use Mode 11 for an INTRA cell!\n");
+               return AVERROR_INVALIDDATA;
+            }
+
+            zoom_fac = mode == 10;
+            error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch,
+                                     zoom_fac, 1, mode, delta, swap_quads,
+                                     &data_ptr, last_ptr);
+        }
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unsupported coding mode: %d\n", mode);
+        return AVERROR_INVALIDDATA;
+    }//switch mode
+
+    switch (error) {
+    case IV3_BAD_RLE:
+        av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE code %X is not allowed at the current line\n",
+               mode, data_ptr[-1]);
+        return AVERROR_INVALIDDATA;
+    case IV3_BAD_DATA:
+        av_log(avctx, AV_LOG_ERROR, "Mode %d: invalid VQ data\n", mode);
+        return AVERROR_INVALIDDATA;
+    case IV3_BAD_COUNTER:
+        av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE-FB invalid counter: %d\n", mode, code);
+        return AVERROR_INVALIDDATA;
+    case IV3_UNSUPPORTED:
+        av_log(avctx, AV_LOG_ERROR, "Mode %d: unsupported RLE code: %X\n", mode, data_ptr[-1]);
+        return AVERROR_INVALIDDATA;
+    case IV3_OUT_OF_DATA:
+        av_log(avctx, AV_LOG_ERROR, "Mode %d: attempt to read past end of buffer\n", mode);
+        return AVERROR_INVALIDDATA;
+    }
+
+    return data_ptr - data_start; /* report number of bytes consumed from the input buffer */
+}
+
+
+/* Binary tree codes. */
+enum {
+    H_SPLIT    = 0,
+    V_SPLIT    = 1,
+    INTRA_NULL = 2,
+    INTER_DATA = 3
+};
+
+
+#define SPLIT_CELL(size, new_size) (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1
+
+#define UPDATE_BITPOS(n) \
+    ctx->skip_bits  += (n); \
+    ctx->need_resync = 1
+
+#define RESYNC_BITSTREAM \
+    if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \
+        skip_bits_long(&ctx->gb, ctx->skip_bits);              \
+        ctx->skip_bits   = 0;                                  \
+        ctx->need_resync = 0;                                  \
+    }
+
+#define CHECK_CELL \
+    if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) ||               \
+        curr_cell.ypos + curr_cell.height > (plane->height >> 2)) {             \
+        av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n",   \
+               curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \
+        return AVERROR_INVALIDDATA;                                                              \
+    }
+
+
+static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
+                         Plane *plane, int code, Cell *ref_cell,
+                         const int depth, const int strip_width)
+{
+    Cell    curr_cell;
+    int     bytes_used;
+    int mv_x, mv_y;
+
+    if (depth <= 0) {
+        av_log(avctx, AV_LOG_ERROR, "Stack overflow (corrupted binary tree)!\n");
+        return AVERROR_INVALIDDATA; // unwind recursion
+    }
+
+    curr_cell = *ref_cell; // clone parent cell
+    if (code == H_SPLIT) {
+        SPLIT_CELL(ref_cell->height, curr_cell.height);
+        ref_cell->ypos   += curr_cell.height;
+        ref_cell->height -= curr_cell.height;
+        if (ref_cell->height <= 0 || curr_cell.height <= 0)
+            return AVERROR_INVALIDDATA;
+    } else if (code == V_SPLIT) {
+        if (curr_cell.width > strip_width) {
+            /* split strip */
+            curr_cell.width = (curr_cell.width <= (strip_width << 1) ? 1 : 2) * strip_width;
+        } else
+            SPLIT_CELL(ref_cell->width, curr_cell.width);
+        ref_cell->xpos  += curr_cell.width;
+        ref_cell->width -= curr_cell.width;
+        if (ref_cell->width <= 0 || curr_cell.width <= 0)
+            return AVERROR_INVALIDDATA;
+    }
+
+    while (get_bits_left(&ctx->gb) >= 2) { /* loop until return */
+        RESYNC_BITSTREAM;
+        switch (code = get_bits(&ctx->gb, 2)) {
+        case H_SPLIT:
+        case V_SPLIT:
+            if (parse_bintree(ctx, avctx, plane, code, &curr_cell, depth - 1, strip_width))
+                return AVERROR_INVALIDDATA;
+            break;
+        case INTRA_NULL:
+            if (!curr_cell.tree) { /* MC tree INTRA code */
+                curr_cell.mv_ptr = 0; /* mark the current strip as INTRA */
+                curr_cell.tree   = 1; /* enter the VQ tree */
+            } else { /* VQ tree NULL code */
+                RESYNC_BITSTREAM;
+                code = get_bits(&ctx->gb, 2);
+                if (code >= 2) {
+                    av_log(avctx, AV_LOG_ERROR, "Invalid VQ_NULL code: %d\n", code);
+                    return AVERROR_INVALIDDATA;
+                }
+                if (code == 1)
+                    av_log(avctx, AV_LOG_ERROR, "SkipCell procedure not implemented yet!\n");
+
+                CHECK_CELL
+                if (!curr_cell.mv_ptr)
+                    return AVERROR_INVALIDDATA;
+
+                mv_y = curr_cell.mv_ptr[0];
+                mv_x = curr_cell.mv_ptr[1];
+                if (   mv_x + 4*curr_cell.xpos < 0
+                    || mv_y + 4*curr_cell.ypos < 0
+                    || mv_x + 4*curr_cell.xpos + 4*curr_cell.width  > plane->width
+                    || mv_y + 4*curr_cell.ypos + 4*curr_cell.height > plane->height) {
+                    av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", mv_x + 4*curr_cell.xpos, mv_y + 4*curr_cell.ypos);
+                    return AVERROR_INVALIDDATA;
+                }
+
+                copy_cell(ctx, plane, &curr_cell);
+                return 0;
+            }
+            break;
+        case INTER_DATA:
+            if (!curr_cell.tree) { /* MC tree INTER code */
+                unsigned mv_idx;
+                /* get motion vector index and setup the pointer to the mv set */
+                if (!ctx->need_resync)
+                    ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
+                if (ctx->next_cell_data >= ctx->last_byte) {
+                    av_log(avctx, AV_LOG_ERROR, "motion vector out of array\n");
+                    return AVERROR_INVALIDDATA;
+                }
+                mv_idx = *(ctx->next_cell_data++);
+                if (mv_idx >= ctx->num_vectors) {
+                    av_log(avctx, AV_LOG_ERROR, "motion vector index out of range\n");
+                    return AVERROR_INVALIDDATA;
+                }
+                curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx << 1];
+                curr_cell.tree   = 1; /* enter the VQ tree */
+                UPDATE_BITPOS(8);
+            } else { /* VQ tree DATA code */
+                if (!ctx->need_resync)
+                    ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
+
+                CHECK_CELL
+                bytes_used = decode_cell(ctx, avctx, plane, &curr_cell,
+                                         ctx->next_cell_data, ctx->last_byte);
+                if (bytes_used < 0)
+                    return AVERROR_INVALIDDATA;
+
+                UPDATE_BITPOS(bytes_used << 3);
+                ctx->next_cell_data += bytes_used;
+                return 0;
+            }
+            break;
+        }
+    }//while
+
+    return AVERROR_INVALIDDATA;
+}
+
+
+static int decode_plane(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
+                        Plane *plane, const uint8_t *data, int32_t data_size,
+                        int32_t strip_width)
+{
+    Cell            curr_cell;
+    unsigned        num_vectors;
+
+    /* each plane data starts with mc_vector_count field, */
+    /* an optional array of motion vectors followed by the vq data */
+    num_vectors = bytestream_get_le32(&data); data_size -= 4;
+    if (num_vectors > 256) {
+        av_log(ctx->avctx, AV_LOG_ERROR,
+               "Read invalid number of motion vectors %d\n", num_vectors);
+        return AVERROR_INVALIDDATA;
+    }
+    if (num_vectors * 2 > data_size)
+        return AVERROR_INVALIDDATA;
+
+    ctx->num_vectors = num_vectors;
+    ctx->mc_vectors  = num_vectors ? data : 0;
+
+    /* init the bitreader */
+    init_get_bits(&ctx->gb, &data[num_vectors * 2], (data_size - num_vectors * 2) << 3);
+    ctx->skip_bits   = 0;
+    ctx->need_resync = 0;
+
+    ctx->last_byte = data + data_size;
+
+    /* initialize the 1st cell and set its dimensions to whole plane */
+    curr_cell.xpos   = curr_cell.ypos = 0;
+    curr_cell.width  = plane->width  >> 2;
+    curr_cell.height = plane->height >> 2;
+    curr_cell.tree   = 0; // we are in the MC tree now
+    curr_cell.mv_ptr = 0; // no motion vector = INTRA cell
+
+    return parse_bintree(ctx, avctx, plane, INTRA_NULL, &curr_cell, CELL_STACK_MAX, strip_width);
+}
+
+
+#define OS_HDR_ID   MKBETAG('F', 'R', 'M', 'H')
+
+static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
+                                const uint8_t *buf, int buf_size)
+{
+    const uint8_t   *buf_ptr = buf, *bs_hdr;
+    uint32_t        frame_num, word2, check_sum, data_size;
+    uint32_t        y_offset, u_offset, v_offset, starts[3], ends[3];
+    uint16_t        height, width;
+    int             i, j;
+
+    /* parse and check the OS header */
+    frame_num = bytestream_get_le32(&buf_ptr);
+    word2     = bytestream_get_le32(&buf_ptr);
+    check_sum = bytestream_get_le32(&buf_ptr);
+    data_size = bytestream_get_le32(&buf_ptr);
+
+    if ((frame_num ^ word2 ^ data_size ^ OS_HDR_ID) != check_sum) {
+        av_log(avctx, AV_LOG_ERROR, "OS header checksum mismatch!\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* parse the bitstream header */
+    bs_hdr = buf_ptr;
+    buf_size -= 16;
+
+    if (bytestream_get_le16(&buf_ptr) != 32) {
+        av_log(avctx, AV_LOG_ERROR, "Unsupported codec version!\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    ctx->frame_num   =  frame_num;
+    ctx->frame_flags =  bytestream_get_le16(&buf_ptr);
+    ctx->data_size   = (bytestream_get_le32(&buf_ptr) + 7) >> 3;
+    ctx->cb_offset   = *buf_ptr++;
+
+    if (ctx->data_size == 16)
+        return 4;
+    if (ctx->data_size > buf_size)
+        ctx->data_size = buf_size;
+
+    buf_ptr += 3; // skip reserved byte and checksum
+
+    /* check frame dimensions */
+    height = bytestream_get_le16(&buf_ptr);
+    width  = bytestream_get_le16(&buf_ptr);
+    if (av_image_check_size(width, height, 0, avctx))
+        return AVERROR_INVALIDDATA;
+
+    if (width != ctx->width || height != ctx->height) {
+        int res;
+
+        av_dlog(avctx, "Frame dimensions changed!\n");
+
+        if (width  < 16 || width  > 640 ||
+            height < 16 || height > 480 ||
+            width  &  3 || height &   3) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Invalid picture dimensions: %d x %d!\n", width, height);
+            return AVERROR_INVALIDDATA;
+        }
+        free_frame_buffers(ctx);
+        if ((res = allocate_frame_buffers(ctx, avctx, width, height)) < 0)
+             return res;
+        avcodec_set_dimensions(avctx, width, height);
+    }
+
+    y_offset = bytestream_get_le32(&buf_ptr);
+    v_offset = bytestream_get_le32(&buf_ptr);
+    u_offset = bytestream_get_le32(&buf_ptr);
+
+    /* unfortunately there is no common order of planes in the buffer */
+    /* so we use that sorting algo for determining planes data sizes  */
+    starts[0] = y_offset;
+    starts[1] = v_offset;
+    starts[2] = u_offset;
+
+    for (j = 0; j < 3; j++) {
+        ends[j] = ctx->data_size;
+        for (i = 2; i >= 0; i--)
+            if (starts[i] < ends[j] && starts[i] > starts[j])
+                ends[j] = starts[i];
+    }
+
+    ctx->y_data_size = ends[0] - starts[0];
+    ctx->v_data_size = ends[1] - starts[1];
+    ctx->u_data_size = ends[2] - starts[2];
+    if (FFMAX3(y_offset, v_offset, u_offset) >= ctx->data_size - 16 ||
+        FFMIN3(ctx->y_data_size, ctx->v_data_size, ctx->u_data_size) <= 0) {
+        av_log(avctx, AV_LOG_ERROR, "One of the y/u/v offsets is invalid\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    ctx->y_data_ptr = bs_hdr + y_offset;
+    ctx->v_data_ptr = bs_hdr + v_offset;
+    ctx->u_data_ptr = bs_hdr + u_offset;
+    ctx->alt_quant  = buf_ptr + sizeof(uint32_t);
+
+    if (ctx->data_size == 16) {
+        av_log(avctx, AV_LOG_DEBUG, "Sync frame encountered!\n");
+        return 16;
+    }
+
+    if (ctx->frame_flags & BS_8BIT_PEL) {
+        avpriv_request_sample(avctx, "8-bit pixel format");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {
+        avpriv_request_sample(avctx, "Halfpel motion vectors");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    return 0;
+}
+
+
+/**
+ *  Convert and output the current plane.
+ *  All pixel values will be upsampled by shifting right by one bit.
+ *
+ *  @param[in]  plane        pointer to the descriptor of the plane being processed
+ *  @param[in]  buf_sel      indicates which frame buffer the input data stored in
+ *  @param[out] dst          pointer to the buffer receiving converted pixels
+ *  @param[in]  dst_pitch    pitch for moving to the next y line
+ *  @param[in]  dst_height   output plane height
+ */
+static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst,
+                         int dst_pitch, int dst_height)
+{
+    int             x,y;
+    const uint8_t   *src  = plane->pixels[buf_sel];
+    uint32_t        pitch = plane->pitch;
+
+    dst_height = FFMIN(dst_height, plane->height);
+    for (y = 0; y < dst_height; y++) {
+        /* convert four pixels at once using SWAR */
+        for (x = 0; x < plane->width >> 2; x++) {
+            AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);
+            src += 4;
+            dst += 4;
+        }
+
+        for (x <<= 2; x < plane->width; x++)
+            *dst++ = *src++ << 1;
+
+        src += pitch     - plane->width;
+        dst += dst_pitch - plane->width;
+    }
+}
+
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    Indeo3DecodeContext *ctx = avctx->priv_data;
+
+    ctx->avctx     = avctx;
+    avctx->pix_fmt = AV_PIX_FMT_YUV410P;
+
+    build_requant_tab();
+
+    ff_hpeldsp_init(&ctx->hdsp, avctx->flags);
+
+    return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height);
+}
+
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    Indeo3DecodeContext *ctx = avctx->priv_data;
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+    AVFrame *frame     = data;
+    int res;
+
+    res = decode_frame_headers(ctx, avctx, buf, buf_size);
+    if (res < 0)
+        return res;
+
+    /* skip sync(null) frames */
+    if (res) {
+        // we have processed 16 bytes but no data was decoded
+        *got_frame = 0;
+        return buf_size;
+    }
+
+    /* skip droppable INTER frames if requested */
+    if (ctx->frame_flags & BS_NONREF &&
+       (avctx->skip_frame >= AVDISCARD_NONREF))
+        return 0;
+
+    /* skip INTER frames if requested */
+    if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)
+        return 0;
+
+    /* use BS_BUFFER flag for buffer switching */
+    ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;
+
+    if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
+        return res;
+
+    /* decode luma plane */
+    if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))
+        return res;
+
+    /* decode chroma planes */
+    if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))
+        return res;
+
+    if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))
+        return res;
+
+    output_plane(&ctx->planes[0], ctx->buf_sel,
+                 frame->data[0], frame->linesize[0],
+                 avctx->height);
+    output_plane(&ctx->planes[1], ctx->buf_sel,
+                 frame->data[1], frame->linesize[1],
+                 (avctx->height + 3) >> 2);
+    output_plane(&ctx->planes[2], ctx->buf_sel,
+                 frame->data[2], frame->linesize[2],
+                 (avctx->height + 3) >> 2);
+
+    *got_frame = 1;
+
+    return buf_size;
+}
+
+
+static av_cold int decode_close(AVCodecContext *avctx)
+{
+    free_frame_buffers(avctx->priv_data);
+
+    return 0;
+}
+
+AVCodec ff_indeo3_decoder = {
+    .name           = "indeo3",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_INDEO3,
+    .priv_data_size = sizeof(Indeo3DecodeContext),
+    .init           = decode_init,
+    .close          = decode_close,
+    .decode         = decode_frame,
+    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),
+    .capabilities   = CODEC_CAP_DR1,
+};