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Diffstat (limited to 'ffmpeg1/libavcodec/indeo3.c')
| -rw-r--r-- | ffmpeg1/libavcodec/indeo3.c | 1138 |
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, +}; |