2 * Indeo Video v3 compatible decoder
3 * Copyright (c) 2009 - 2011 Maxim Poliakovski
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * This is a decoder for Intel Indeo Video v3.
25 * It is based on vector quantization, run-length coding and motion compensation.
26 * Known container formats: .avi and .mov
27 * Known FOURCCs: 'IV31', 'IV32'
29 * @see http://wiki.multimedia.cx/index.php?title=Indeo_3
32 #include "libavutil/imgutils.h"
33 #include "libavutil/intreadwrite.h"
36 #include "bytestream.h"
39 #include "indeo3data.h"
43 RLE_ESC_F9 = 249, ///< same as RLE_ESC_FA + do the same with next block
44 RLE_ESC_FA = 250, ///< INTRA: skip block, INTER: copy data from reference
45 RLE_ESC_FB = 251, ///< apply null delta to N blocks / skip N blocks
46 RLE_ESC_FC = 252, ///< same as RLE_ESC_FD + do the same with next block
47 RLE_ESC_FD = 253, ///< apply null delta to all remaining lines of this block
48 RLE_ESC_FE = 254, ///< apply null delta to all lines up to the 3rd line
49 RLE_ESC_FF = 255 ///< apply null delta to all lines up to the 2nd line
53 /* Some constants for parsing frame bitstream flags. */
54 #define BS_8BIT_PEL (1 << 1) ///< 8bit pixel bitdepth indicator
55 #define BS_KEYFRAME (1 << 2) ///< intra frame indicator
56 #define BS_MV_Y_HALF (1 << 4) ///< vertical mv halfpel resolution indicator
57 #define BS_MV_X_HALF (1 << 5) ///< horizontal mv halfpel resolution indicator
58 #define BS_NONREF (1 << 8) ///< nonref (discardable) frame indicator
59 #define BS_BUFFER 9 ///< indicates which of two frame buffers should be used
62 typedef struct Plane {
64 uint8_t *pixels[2]; ///< pointer to the actual pixel data of the buffers above
70 #define CELL_STACK_MAX 20
73 int16_t xpos; ///< cell coordinates in 4x4 blocks
75 int16_t width; ///< cell width in 4x4 blocks
76 int16_t height; ///< cell height in 4x4 blocks
77 uint8_t tree; ///< tree id: 0- MC tree, 1 - VQ tree
78 const int8_t *mv_ptr; ///< ptr to the motion vector if any
81 typedef struct Indeo3DecodeContext {
82 AVCodecContext *avctx;
89 const uint8_t *next_cell_data;
90 const uint8_t *last_byte;
91 const int8_t *mc_vectors;
93 int16_t width, height;
94 uint32_t frame_num; ///< current frame number (zero-based)
95 uint32_t data_size; ///< size of the frame data in bytes
96 uint16_t frame_flags; ///< frame properties
97 uint8_t cb_offset; ///< needed for selecting VQ tables
98 uint8_t buf_sel; ///< active frame buffer: 0 - primary, 1 -secondary
99 const uint8_t *y_data_ptr;
100 const uint8_t *v_data_ptr;
101 const uint8_t *u_data_ptr;
105 const uint8_t *alt_quant; ///< secondary VQ table set for the modes 1 and 4
107 } Indeo3DecodeContext;
110 static uint8_t requant_tab[8][128];
113 * Build the static requantization table.
114 * This table is used to remap pixel values according to a specific
115 * quant index and thus avoid overflows while adding deltas.
117 static av_cold void build_requant_tab(void)
119 static int8_t offsets[8] = { 1, 1, 2, -3, -3, 3, 4, 4 };
120 static int8_t deltas [8] = { 0, 1, 0, 4, 4, 1, 0, 1 };
124 for (i = 0; i < 8; i++) {
126 for (j = 0; j < 128; j++)
127 requant_tab[i][j] = (j + offsets[i]) / step * step + deltas[i];
130 /* some last elements calculated above will have values >= 128 */
131 /* pixel values shall never exceed 127 so set them to non-overflowing values */
132 /* according with the quantization step of the respective section */
133 requant_tab[0][127] = 126;
134 requant_tab[1][119] = 118;
135 requant_tab[1][120] = 118;
136 requant_tab[2][126] = 124;
137 requant_tab[2][127] = 124;
138 requant_tab[6][124] = 120;
139 requant_tab[6][125] = 120;
140 requant_tab[6][126] = 120;
141 requant_tab[6][127] = 120;
143 /* Patch for compatibility with the Intel's binary decoders */
144 requant_tab[1][7] = 10;
145 requant_tab[4][8] = 10;
149 static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,
150 AVCodecContext *avctx)
152 int p, luma_width, luma_height, chroma_width, chroma_height;
153 int luma_pitch, chroma_pitch, luma_size, chroma_size;
155 luma_width = ctx->width;
156 luma_height = ctx->height;
158 if (luma_width < 16 || luma_width > 640 ||
159 luma_height < 16 || luma_height > 480 ||
160 luma_width & 3 || luma_height & 3) {
161 av_log(avctx, AV_LOG_ERROR, "Invalid picture dimensions: %d x %d!\n",
162 luma_width, luma_height);
163 return AVERROR_INVALIDDATA;
166 chroma_width = FFALIGN(luma_width >> 2, 4);
167 chroma_height = FFALIGN(luma_height >> 2, 4);
169 luma_pitch = FFALIGN(luma_width, 16);
170 chroma_pitch = FFALIGN(chroma_width, 16);
172 /* Calculate size of the luminance plane. */
173 /* Add one line more for INTRA prediction. */
174 luma_size = luma_pitch * (luma_height + 1);
176 /* Calculate size of a chrominance planes. */
177 /* Add one line more for INTRA prediction. */
178 chroma_size = chroma_pitch * (chroma_height + 1);
180 /* allocate frame buffers */
181 for (p = 0; p < 3; p++) {
182 ctx->planes[p].pitch = !p ? luma_pitch : chroma_pitch;
183 ctx->planes[p].width = !p ? luma_width : chroma_width;
184 ctx->planes[p].height = !p ? luma_height : chroma_height;
186 ctx->planes[p].buffers[0] = av_malloc(!p ? luma_size : chroma_size);
187 ctx->planes[p].buffers[1] = av_malloc(!p ? luma_size : chroma_size);
189 /* fill the INTRA prediction lines with the middle pixel value = 64 */
190 memset(ctx->planes[p].buffers[0], 0x40, ctx->planes[p].pitch);
191 memset(ctx->planes[p].buffers[1], 0x40, ctx->planes[p].pitch);
193 /* set buffer pointers = buf_ptr + pitch and thus skip the INTRA prediction line */
194 ctx->planes[p].pixels[0] = ctx->planes[p].buffers[0] + ctx->planes[p].pitch;
195 ctx->planes[p].pixels[1] = ctx->planes[p].buffers[1] + ctx->planes[p].pitch;
202 static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)
206 for (p = 0; p < 3; p++) {
207 av_freep(&ctx->planes[p].buffers[0]);
208 av_freep(&ctx->planes[p].buffers[1]);
214 * Copy pixels of the cell(x + mv_x, y + mv_y) from the previous frame into
215 * the cell(x, y) in the current frame.
217 * @param ctx pointer to the decoder context
218 * @param plane pointer to the plane descriptor
219 * @param cell pointer to the cell descriptor
221 static void copy_cell(Indeo3DecodeContext *ctx, Plane *plane, Cell *cell)
223 int h, w, mv_x, mv_y, offset, offset_dst;
226 /* setup output and reference pointers */
227 offset_dst = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
228 dst = plane->pixels[ctx->buf_sel] + offset_dst;
229 mv_y = cell->mv_ptr[0];
230 mv_x = cell->mv_ptr[1];
231 offset = offset_dst + mv_y * plane->pitch + mv_x;
232 src = plane->pixels[ctx->buf_sel ^ 1] + offset;
234 h = cell->height << 2;
236 for (w = cell->width; w > 0;) {
237 /* copy using 16xH blocks */
238 if (!((cell->xpos << 2) & 15) && w >= 4) {
239 for (; w >= 4; src += 16, dst += 16, w -= 4)
240 ctx->dsp.put_no_rnd_pixels_tab[0][0](dst, src, plane->pitch, h);
243 /* copy using 8xH blocks */
244 if (!((cell->xpos << 2) & 7) && w >= 2) {
245 ctx->dsp.put_no_rnd_pixels_tab[1][0](dst, src, plane->pitch, h);
252 copy_block4(dst, src, plane->pitch, plane->pitch, h);
261 /* Average 4/8 pixels at once without rounding using SWAR */
262 #define AVG_32(dst, src, ref) \
263 AV_WN32A(dst, ((AV_RN32A(src) + AV_RN32A(ref)) >> 1) & 0x7F7F7F7FUL)
265 #define AVG_64(dst, src, ref) \
266 AV_WN64A(dst, ((AV_RN64A(src) + AV_RN64A(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)
270 * Replicate each even pixel as follows:
271 * ABCDEFGH -> AACCEEGG
273 static inline uint64_t replicate64(uint64_t a) {
275 a &= 0xFF00FF00FF00FF00ULL;
278 a &= 0x00FF00FF00FF00FFULL;
284 static inline uint32_t replicate32(uint32_t a) {
296 /* Fill n lines with 64bit pixel value pix */
297 static inline void fill_64(uint8_t *dst, const uint64_t pix, int32_t n,
300 for (; n > 0; dst += row_offset, n--)
305 /* Error codes for cell decoding. */
316 #define BUFFER_PRECHECK \
317 if (*data_ptr >= last_ptr) \
318 return IV3_OUT_OF_DATA; \
320 #define RLE_BLOCK_COPY \
321 if (cell->mv_ptr || !skip_flag) \
322 copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom)
324 #define RLE_BLOCK_COPY_8 \
325 pix64 = AV_RN64A(ref);\
326 if (is_first_row) {/* special prediction case: top line of a cell */\
327 pix64 = replicate64(pix64);\
328 fill_64(dst + row_offset, pix64, 7, row_offset);\
329 AVG_64(dst, ref, dst + row_offset);\
331 fill_64(dst, pix64, 8, row_offset)
333 #define RLE_LINES_COPY \
334 copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom)
336 #define RLE_LINES_COPY_M10 \
337 pix64 = AV_RN64A(ref);\
338 if (is_top_of_cell) {\
339 pix64 = replicate64(pix64);\
340 fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\
341 AVG_64(dst, ref, dst + row_offset);\
343 fill_64(dst, pix64, num_lines << 1, row_offset)
345 #define APPLY_DELTA_4 \
346 AV_WN16A(dst + line_offset , AV_RN16A(ref ) + delta_tab->deltas[dyad1]);\
347 AV_WN16A(dst + line_offset + 2, AV_RN16A(ref + 2) + delta_tab->deltas[dyad2]);\
349 if (is_top_of_cell && !cell->ypos) {\
350 AV_COPY32(dst, dst + row_offset);\
352 AVG_32(dst, ref, dst + row_offset);\
356 #define APPLY_DELTA_8 \
357 /* apply two 32-bit VQ deltas to next even line */\
358 if (is_top_of_cell) { \
359 AV_WN32A(dst + row_offset , \
360 replicate32(AV_RN32A(ref )) + delta_tab->deltas_m10[dyad1]);\
361 AV_WN32A(dst + row_offset + 4, \
362 replicate32(AV_RN32A(ref + 4)) + delta_tab->deltas_m10[dyad2]);\
364 AV_WN32A(dst + row_offset , \
365 AV_RN32A(ref ) + delta_tab->deltas_m10[dyad1]);\
366 AV_WN32A(dst + row_offset + 4, \
367 AV_RN32A(ref + 4) + delta_tab->deltas_m10[dyad2]);\
369 /* odd lines are not coded but rather interpolated/replicated */\
370 /* first line of the cell on the top of image? - replicate */\
371 /* otherwise - interpolate */\
372 if (is_top_of_cell && !cell->ypos) {\
373 AV_COPY64(dst, dst + row_offset);\
375 AVG_64(dst, ref, dst + row_offset);
378 #define APPLY_DELTA_1011_INTER \
381 AV_RN32A(dst ) + delta_tab->deltas_m10[dyad1]);\
383 AV_RN32A(dst + 4 ) + delta_tab->deltas_m10[dyad2]);\
384 AV_WN32A(dst + row_offset , \
385 AV_RN32A(dst + row_offset ) + delta_tab->deltas_m10[dyad1]);\
386 AV_WN32A(dst + row_offset + 4, \
387 AV_RN32A(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]);\
390 AV_RN16A(dst ) + delta_tab->deltas[dyad1]);\
392 AV_RN16A(dst + 2 ) + delta_tab->deltas[dyad2]);\
393 AV_WN16A(dst + row_offset , \
394 AV_RN16A(dst + row_offset ) + delta_tab->deltas[dyad1]);\
395 AV_WN16A(dst + row_offset + 2, \
396 AV_RN16A(dst + row_offset + 2) + delta_tab->deltas[dyad2]);\
400 static int decode_cell_data(Cell *cell, uint8_t *block, uint8_t *ref_block,
401 int pitch, int h_zoom, int v_zoom, int mode,
402 const vqEntry *delta[2], int swap_quads[2],
403 const uint8_t **data_ptr, const uint8_t *last_ptr)
405 int x, y, line, num_lines;
407 uint8_t code, *dst, *ref;
408 const vqEntry *delta_tab;
409 unsigned int dyad1, dyad2;
411 int skip_flag = 0, is_top_of_cell, is_first_row = 1;
412 int row_offset, blk_row_offset, line_offset;
415 blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2);
416 line_offset = v_zoom ? row_offset : 0;
418 for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) {
419 for (x = 0; x < cell->width; x += 1 + h_zoom) {
423 if (rle_blocks > 0) {
426 } else if (mode == 10 && !cell->mv_ptr) {
431 for (line = 0; line < 4;) {
433 is_top_of_cell = is_first_row && !line;
435 /* select primary VQ table for odd, secondary for even lines */
437 delta_tab = delta[line & 1];
439 delta_tab = delta[1];
441 code = bytestream_get_byte(data_ptr);
443 if (code < delta_tab->num_dyads) {
445 dyad1 = bytestream_get_byte(data_ptr);
447 if (dyad1 > delta_tab->num_dyads || dyad1 >= 248)
451 code -= delta_tab->num_dyads;
452 dyad1 = code / delta_tab->quad_exp;
453 dyad2 = code % delta_tab->quad_exp;
454 if (swap_quads[line & 1])
455 FFSWAP(unsigned int, dyad1, dyad2);
459 } else if (mode == 10 && !cell->mv_ptr) {
462 APPLY_DELTA_1011_INTER;
465 /* process RLE codes */
475 num_lines = 257 - code - line;
480 } else if (mode == 10 && !cell->mv_ptr) {
486 code = bytestream_get_byte(data_ptr);
487 rle_blocks = (code & 0x1F) - 1; /* set block counter */
488 if (code >= 64 || rle_blocks < 0)
489 return IV3_BAD_COUNTER;
490 skip_flag = code & 0x20;
491 num_lines = 4 - line; /* enforce next block processing */
492 if (mode >= 10 || (cell->mv_ptr || !skip_flag)) {
495 } else if (mode == 10 && !cell->mv_ptr) {
507 num_lines = 4; /* enforce next block processing */
511 } else if (mode == 10 && !cell->mv_ptr) {
517 return IV3_UNSUPPORTED;
522 ref += row_offset * (num_lines << v_zoom);
523 dst += row_offset * (num_lines << v_zoom);
527 /* move to next horizontal block */
528 block += 4 << h_zoom;
529 ref_block += 4 << h_zoom;
532 /* move to next line of blocks */
533 ref_block += blk_row_offset;
534 block += blk_row_offset;
541 * Decode a vector-quantized cell.
542 * It consists of several routines, each of which handles one or more "modes"
543 * with which a cell can be encoded.
545 * @param ctx pointer to the decoder context
546 * @param avctx ptr to the AVCodecContext
547 * @param plane pointer to the plane descriptor
548 * @param cell pointer to the cell descriptor
549 * @param data_ptr pointer to the compressed data
550 * @param last_ptr pointer to the last byte to catch reads past end of buffer
551 * @return number of consumed bytes or negative number in case of error
553 static int decode_cell(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
554 Plane *plane, Cell *cell, const uint8_t *data_ptr,
555 const uint8_t *last_ptr)
557 int x, mv_x, mv_y, mode, vq_index, prim_indx, second_indx;
559 int offset, error = 0, swap_quads[2];
560 uint8_t code, *block, *ref_block = 0;
561 const vqEntry *delta[2];
562 const uint8_t *data_start = data_ptr;
564 /* get coding mode and VQ table index from the VQ descriptor byte */
567 vq_index = code & 0xF;
569 /* setup output and reference pointers */
570 offset = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
571 block = plane->pixels[ctx->buf_sel] + offset;
573 /* use previous line as reference for INTRA cells */
574 ref_block = block - plane->pitch;
575 } else if (mode >= 10) {
576 /* for mode 10 and 11 INTER first copy the predicted cell into the current one */
577 /* so we don't need to do data copying for each RLE code later */
578 copy_cell(ctx, plane, cell);
580 /* set the pointer to the reference pixels for modes 0-4 INTER */
581 mv_y = cell->mv_ptr[0];
582 mv_x = cell->mv_ptr[1];
583 offset += mv_y * plane->pitch + mv_x;
584 ref_block = plane->pixels[ctx->buf_sel ^ 1] + offset;
587 /* select VQ tables as follows: */
588 /* modes 0 and 3 use only the primary table for all lines in a block */
589 /* while modes 1 and 4 switch between primary and secondary tables on alternate lines */
590 if (mode == 1 || mode == 4) {
591 code = ctx->alt_quant[vq_index];
592 prim_indx = (code >> 4) + ctx->cb_offset;
593 second_indx = (code & 0xF) + ctx->cb_offset;
595 vq_index += ctx->cb_offset;
596 prim_indx = second_indx = vq_index;
599 if (prim_indx >= 24 || second_indx >= 24) {
600 av_log(avctx, AV_LOG_ERROR, "Invalid VQ table indexes! Primary: %d, secondary: %d!\n",
601 prim_indx, second_indx);
602 return AVERROR_INVALIDDATA;
605 delta[0] = &vq_tab[second_indx];
606 delta[1] = &vq_tab[prim_indx];
607 swap_quads[0] = second_indx >= 16;
608 swap_quads[1] = prim_indx >= 16;
610 /* requantize the prediction if VQ index of this cell differs from VQ index */
611 /* of the predicted cell in order to avoid overflows. */
612 if (vq_index >= 8 && ref_block) {
613 for (x = 0; x < cell->width << 2; x++)
614 ref_block[x] = requant_tab[vq_index & 7][ref_block[x]];
620 case 0: /*------------------ MODES 0 & 1 (4x4 block processing) --------------------*/
622 case 3: /*------------------ MODES 3 & 4 (4x8 block processing) --------------------*/
624 if (mode >= 3 && cell->mv_ptr) {
625 av_log(avctx, AV_LOG_ERROR, "Attempt to apply Mode 3/4 to an INTER cell!\n");
626 return AVERROR_INVALIDDATA;
629 zoom_fac = mode >= 3;
630 error = decode_cell_data(cell, block, ref_block, plane->pitch, 0, zoom_fac,
631 mode, delta, swap_quads, &data_ptr, last_ptr);
633 case 10: /*-------------------- MODE 10 (8x8 block processing) ---------------------*/
634 case 11: /*----------------- MODE 11 (4x8 INTER block processing) ------------------*/
635 if (mode == 10 && !cell->mv_ptr) { /* MODE 10 INTRA processing */
636 error = decode_cell_data(cell, block, ref_block, plane->pitch, 1, 1,
637 mode, delta, swap_quads, &data_ptr, last_ptr);
638 } else { /* mode 10 and 11 INTER processing */
639 if (mode == 11 && !cell->mv_ptr) {
640 av_log(avctx, AV_LOG_ERROR, "Attempt to use Mode 11 for an INTRA cell!\n");
641 return AVERROR_INVALIDDATA;
644 zoom_fac = mode == 10;
645 error = decode_cell_data(cell, block, ref_block, plane->pitch,
646 zoom_fac, 1, mode, delta, swap_quads,
647 &data_ptr, last_ptr);
651 av_log(avctx, AV_LOG_ERROR, "Unsupported coding mode: %d\n", mode);
652 return AVERROR_INVALIDDATA;
657 av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE code %X is not allowed at the current line\n",
659 return AVERROR_INVALIDDATA;
661 av_log(avctx, AV_LOG_ERROR, "Mode %d: invalid VQ data\n", mode);
662 return AVERROR_INVALIDDATA;
663 case IV3_BAD_COUNTER:
664 av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE-FB invalid counter: %d\n", mode, code);
665 return AVERROR_INVALIDDATA;
666 case IV3_UNSUPPORTED:
667 av_log(avctx, AV_LOG_ERROR, "Mode %d: unsupported RLE code: %X\n", mode, data_ptr[-1]);
668 return AVERROR_INVALIDDATA;
669 case IV3_OUT_OF_DATA:
670 av_log(avctx, AV_LOG_ERROR, "Mode %d: attempt to read past end of buffer\n", mode);
671 return AVERROR_INVALIDDATA;
674 return data_ptr - data_start; /* report number of bytes consumed from the input buffer */
678 /* Binary tree codes. */
687 #define SPLIT_CELL(size, new_size) (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1
689 #define UPDATE_BITPOS(n) \
690 ctx->skip_bits += (n); \
693 #define RESYNC_BITSTREAM \
694 if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \
695 skip_bits_long(&ctx->gb, ctx->skip_bits); \
696 ctx->skip_bits = 0; \
697 ctx->need_resync = 0; \
701 if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) || \
702 curr_cell.ypos + curr_cell.height > (plane->height >> 2)) { \
703 av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n", \
704 curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \
705 return AVERROR_INVALIDDATA; \
709 static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
710 Plane *plane, int code, Cell *ref_cell,
711 const int depth, const int strip_width)
717 av_log(avctx, AV_LOG_ERROR, "Stack overflow (corrupted binary tree)!\n");
718 return AVERROR_INVALIDDATA; // unwind recursion
721 curr_cell = *ref_cell; // clone parent cell
722 if (code == H_SPLIT) {
723 SPLIT_CELL(ref_cell->height, curr_cell.height);
724 ref_cell->ypos += curr_cell.height;
725 ref_cell->height -= curr_cell.height;
726 } else if (code == V_SPLIT) {
727 if (curr_cell.width > strip_width) {
729 curr_cell.width = (curr_cell.width <= (strip_width << 1) ? 1 : 2) * strip_width;
731 SPLIT_CELL(ref_cell->width, curr_cell.width);
732 ref_cell->xpos += curr_cell.width;
733 ref_cell->width -= curr_cell.width;
736 while (1) { /* loop until return */
738 switch (code = get_bits(&ctx->gb, 2)) {
741 if (parse_bintree(ctx, avctx, plane, code, &curr_cell, depth - 1, strip_width))
742 return AVERROR_INVALIDDATA;
745 if (!curr_cell.tree) { /* MC tree INTRA code */
746 curr_cell.mv_ptr = 0; /* mark the current strip as INTRA */
747 curr_cell.tree = 1; /* enter the VQ tree */
748 } else { /* VQ tree NULL code */
750 code = get_bits(&ctx->gb, 2);
752 av_log(avctx, AV_LOG_ERROR, "Invalid VQ_NULL code: %d\n", code);
753 return AVERROR_INVALIDDATA;
756 av_log(avctx, AV_LOG_ERROR, "SkipCell procedure not implemented yet!\n");
759 copy_cell(ctx, plane, &curr_cell);
764 if (!curr_cell.tree) { /* MC tree INTER code */
765 /* get motion vector index and setup the pointer to the mv set */
766 if (!ctx->need_resync)
767 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
768 curr_cell.mv_ptr = &ctx->mc_vectors[*(ctx->next_cell_data++) << 1];
769 curr_cell.tree = 1; /* enter the VQ tree */
771 } else { /* VQ tree DATA code */
772 if (!ctx->need_resync)
773 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
776 bytes_used = decode_cell(ctx, avctx, plane, &curr_cell,
777 ctx->next_cell_data, ctx->last_byte);
779 return AVERROR_INVALIDDATA;
781 UPDATE_BITPOS(bytes_used << 3);
782 ctx->next_cell_data += bytes_used;
793 static int decode_plane(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
794 Plane *plane, const uint8_t *data, int32_t data_size,
800 /* each plane data starts with mc_vector_count field, */
801 /* an optional array of motion vectors followed by the vq data */
802 num_vectors = bytestream_get_le32(&data);
803 ctx->mc_vectors = num_vectors ? data : 0;
805 /* init the bitreader */
806 init_get_bits(&ctx->gb, &data[num_vectors * 2], data_size << 3);
808 ctx->need_resync = 0;
810 ctx->last_byte = data + data_size - 1;
812 /* initialize the 1st cell and set its dimensions to whole plane */
813 curr_cell.xpos = curr_cell.ypos = 0;
814 curr_cell.width = plane->width >> 2;
815 curr_cell.height = plane->height >> 2;
816 curr_cell.tree = 0; // we are in the MC tree now
817 curr_cell.mv_ptr = 0; // no motion vector = INTRA cell
819 return parse_bintree(ctx, avctx, plane, INTRA_NULL, &curr_cell, CELL_STACK_MAX, strip_width);
823 #define OS_HDR_ID MKBETAG('F', 'R', 'M', 'H')
825 static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
826 const uint8_t *buf, int buf_size)
828 const uint8_t *buf_ptr = buf, *bs_hdr;
829 uint32_t frame_num, word2, check_sum, data_size;
830 uint32_t y_offset, u_offset, v_offset, starts[3], ends[3];
831 uint16_t height, width;
834 /* parse and check the OS header */
835 frame_num = bytestream_get_le32(&buf_ptr);
836 word2 = bytestream_get_le32(&buf_ptr);
837 check_sum = bytestream_get_le32(&buf_ptr);
838 data_size = bytestream_get_le32(&buf_ptr);
840 if ((frame_num ^ word2 ^ data_size ^ OS_HDR_ID) != check_sum) {
841 av_log(avctx, AV_LOG_ERROR, "OS header checksum mismatch!\n");
842 return AVERROR_INVALIDDATA;
845 /* parse the bitstream header */
848 if (bytestream_get_le16(&buf_ptr) != 32) {
849 av_log(avctx, AV_LOG_ERROR, "Unsupported codec version!\n");
850 return AVERROR_INVALIDDATA;
853 ctx->frame_num = frame_num;
854 ctx->frame_flags = bytestream_get_le16(&buf_ptr);
855 ctx->data_size = (bytestream_get_le32(&buf_ptr) + 7) >> 3;
856 ctx->cb_offset = *buf_ptr++;
858 if (ctx->data_size == 16)
860 if (ctx->data_size > buf_size)
861 ctx->data_size = buf_size;
863 buf_ptr += 3; // skip reserved byte and checksum
865 /* check frame dimensions */
866 height = bytestream_get_le16(&buf_ptr);
867 width = bytestream_get_le16(&buf_ptr);
868 if (av_image_check_size(width, height, 0, avctx))
869 return AVERROR_INVALIDDATA;
871 if (width != ctx->width || height != ctx->height) {
872 av_dlog(avctx, "Frame dimensions changed!\n");
875 ctx->height = height;
877 free_frame_buffers(ctx);
878 allocate_frame_buffers(ctx, avctx);
879 avcodec_set_dimensions(avctx, width, height);
882 y_offset = bytestream_get_le32(&buf_ptr);
883 v_offset = bytestream_get_le32(&buf_ptr);
884 u_offset = bytestream_get_le32(&buf_ptr);
886 /* unfortunately there is no common order of planes in the buffer */
887 /* so we use that sorting algo for determining planes data sizes */
888 starts[0] = y_offset;
889 starts[1] = v_offset;
890 starts[2] = u_offset;
892 for (j = 0; j < 3; j++) {
893 ends[j] = ctx->data_size;
894 for (i = 2; i >= 0; i--)
895 if (starts[i] < ends[j] && starts[i] > starts[j])
899 ctx->y_data_size = ends[0] - starts[0];
900 ctx->v_data_size = ends[1] - starts[1];
901 ctx->u_data_size = ends[2] - starts[2];
902 if (FFMAX3(y_offset, v_offset, u_offset) >= ctx->data_size - 16 ||
903 FFMIN3(ctx->y_data_size, ctx->v_data_size, ctx->u_data_size) <= 0) {
904 av_log(avctx, AV_LOG_ERROR, "One of the y/u/v offsets is invalid\n");
905 return AVERROR_INVALIDDATA;
908 ctx->y_data_ptr = bs_hdr + y_offset;
909 ctx->v_data_ptr = bs_hdr + v_offset;
910 ctx->u_data_ptr = bs_hdr + u_offset;
911 ctx->alt_quant = buf_ptr + sizeof(uint32_t);
913 if (ctx->data_size == 16) {
914 av_log(avctx, AV_LOG_DEBUG, "Sync frame encountered!\n");
918 if (ctx->frame_flags & BS_8BIT_PEL) {
919 av_log_ask_for_sample(avctx, "8-bit pixel format\n");
920 return AVERROR_PATCHWELCOME;
923 if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {
924 av_log_ask_for_sample(avctx, "halfpel motion vectors\n");
925 return AVERROR_PATCHWELCOME;
933 * Convert and output the current plane.
934 * All pixel values will be upsampled by shifting right by one bit.
936 * @param[in] plane pointer to the descriptor of the plane being processed
937 * @param[in] buf_sel indicates which frame buffer the input data stored in
938 * @param[out] dst pointer to the buffer receiving converted pixels
939 * @param[in] dst_pitch pitch for moving to the next y line
941 static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst, int dst_pitch)
944 const uint8_t *src = plane->pixels[buf_sel];
945 uint32_t pitch = plane->pitch;
947 for (y = 0; y < plane->height; y++) {
948 /* convert four pixels at once using SWAR */
949 for (x = 0; x < plane->width >> 2; x++) {
950 AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);
955 for (x <<= 2; x < plane->width; x++)
956 *dst++ = *src++ << 1;
958 src += pitch - plane->width;
959 dst += dst_pitch - plane->width;
964 static av_cold int decode_init(AVCodecContext *avctx)
966 Indeo3DecodeContext *ctx = avctx->priv_data;
969 ctx->width = avctx->width;
970 ctx->height = avctx->height;
971 avctx->pix_fmt = PIX_FMT_YUV410P;
972 avcodec_get_frame_defaults(&ctx->frame);
976 dsputil_init(&ctx->dsp, avctx);
978 allocate_frame_buffers(ctx, avctx);
984 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
987 Indeo3DecodeContext *ctx = avctx->priv_data;
988 const uint8_t *buf = avpkt->data;
989 int buf_size = avpkt->size;
992 res = decode_frame_headers(ctx, avctx, buf, buf_size);
996 /* skip sync(null) frames */
998 // we have processed 16 bytes but no data was decoded
1003 /* skip droppable INTER frames if requested */
1004 if (ctx->frame_flags & BS_NONREF &&
1005 (avctx->skip_frame >= AVDISCARD_NONREF))
1008 /* skip INTER frames if requested */
1009 if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)
1012 /* use BS_BUFFER flag for buffer switching */
1013 ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;
1015 /* decode luma plane */
1016 if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))
1019 /* decode chroma planes */
1020 if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))
1023 if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))
1026 if (ctx->frame.data[0])
1027 avctx->release_buffer(avctx, &ctx->frame);
1029 ctx->frame.reference = 0;
1030 if ((res = avctx->get_buffer(avctx, &ctx->frame)) < 0) {
1031 av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1035 output_plane(&ctx->planes[0], ctx->buf_sel, ctx->frame.data[0], ctx->frame.linesize[0]);
1036 output_plane(&ctx->planes[1], ctx->buf_sel, ctx->frame.data[1], ctx->frame.linesize[1]);
1037 output_plane(&ctx->planes[2], ctx->buf_sel, ctx->frame.data[2], ctx->frame.linesize[2]);
1039 *data_size = sizeof(AVFrame);
1040 *(AVFrame*)data = ctx->frame;
1046 static av_cold int decode_close(AVCodecContext *avctx)
1048 Indeo3DecodeContext *ctx = avctx->priv_data;
1050 free_frame_buffers(avctx->priv_data);
1052 if (ctx->frame.data[0])
1053 avctx->release_buffer(avctx, &ctx->frame);
1058 AVCodec ff_indeo3_decoder = {
1060 .type = AVMEDIA_TYPE_VIDEO,
1061 .id = CODEC_ID_INDEO3,
1062 .priv_data_size = sizeof(Indeo3DecodeContext),
1063 .init = decode_init,
1064 .close = decode_close,
1065 .decode = decode_frame,
1066 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),