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;
92 unsigned num_vectors; ///< number of motion vectors in mc_vectors
94 int16_t width, height;
95 uint32_t frame_num; ///< current frame number (zero-based)
96 uint32_t data_size; ///< size of the frame data in bytes
97 uint16_t frame_flags; ///< frame properties
98 uint8_t cb_offset; ///< needed for selecting VQ tables
99 uint8_t buf_sel; ///< active frame buffer: 0 - primary, 1 -secondary
100 const uint8_t *y_data_ptr;
101 const uint8_t *v_data_ptr;
102 const uint8_t *u_data_ptr;
106 const uint8_t *alt_quant; ///< secondary VQ table set for the modes 1 and 4
108 } Indeo3DecodeContext;
111 static uint8_t requant_tab[8][128];
114 * Build the static requantization table.
115 * This table is used to remap pixel values according to a specific
116 * quant index and thus avoid overflows while adding deltas.
118 static av_cold void build_requant_tab(void)
120 static int8_t offsets[8] = { 1, 1, 2, -3, -3, 3, 4, 4 };
121 static int8_t deltas [8] = { 0, 1, 0, 4, 4, 1, 0, 1 };
125 for (i = 0; i < 8; i++) {
127 for (j = 0; j < 128; j++)
128 requant_tab[i][j] = (j + offsets[i]) / step * step + deltas[i];
131 /* some last elements calculated above will have values >= 128 */
132 /* pixel values shall never exceed 127 so set them to non-overflowing values */
133 /* according with the quantization step of the respective section */
134 requant_tab[0][127] = 126;
135 requant_tab[1][119] = 118;
136 requant_tab[1][120] = 118;
137 requant_tab[2][126] = 124;
138 requant_tab[2][127] = 124;
139 requant_tab[6][124] = 120;
140 requant_tab[6][125] = 120;
141 requant_tab[6][126] = 120;
142 requant_tab[6][127] = 120;
144 /* Patch for compatibility with the Intel's binary decoders */
145 requant_tab[1][7] = 10;
146 requant_tab[4][8] = 10;
150 static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,
151 AVCodecContext *avctx, int luma_width, int luma_height)
153 int p, chroma_width, chroma_height;
154 int luma_pitch, chroma_pitch, luma_size, chroma_size;
156 if (luma_width < 16 || luma_width > 640 ||
157 luma_height < 16 || luma_height > 480 ||
158 luma_width & 3 || luma_height & 3) {
159 av_log(avctx, AV_LOG_ERROR, "Invalid picture dimensions: %d x %d!\n",
160 luma_width, luma_height);
161 return AVERROR_INVALIDDATA;
164 ctx->width = luma_width ;
165 ctx->height = luma_height;
167 chroma_width = FFALIGN(luma_width >> 2, 4);
168 chroma_height = FFALIGN(luma_height >> 2, 4);
170 luma_pitch = FFALIGN(luma_width, 16);
171 chroma_pitch = FFALIGN(chroma_width, 16);
173 /* Calculate size of the luminance plane. */
174 /* Add one line more for INTRA prediction. */
175 luma_size = luma_pitch * (luma_height + 1);
177 /* Calculate size of a chrominance planes. */
178 /* Add one line more for INTRA prediction. */
179 chroma_size = chroma_pitch * (chroma_height + 1);
181 /* allocate frame buffers */
182 for (p = 0; p < 3; p++) {
183 ctx->planes[p].pitch = !p ? luma_pitch : chroma_pitch;
184 ctx->planes[p].width = !p ? luma_width : chroma_width;
185 ctx->planes[p].height = !p ? luma_height : chroma_height;
187 ctx->planes[p].buffers[0] = av_malloc(!p ? luma_size : chroma_size);
188 ctx->planes[p].buffers[1] = av_malloc(!p ? luma_size : chroma_size);
190 /* fill the INTRA prediction lines with the middle pixel value = 64 */
191 memset(ctx->planes[p].buffers[0], 0x40, ctx->planes[p].pitch);
192 memset(ctx->planes[p].buffers[1], 0x40, ctx->planes[p].pitch);
194 /* set buffer pointers = buf_ptr + pitch and thus skip the INTRA prediction line */
195 ctx->planes[p].pixels[0] = ctx->planes[p].buffers[0] + ctx->planes[p].pitch;
196 ctx->planes[p].pixels[1] = ctx->planes[p].buffers[1] + ctx->planes[p].pitch;
197 memset(ctx->planes[p].pixels[0], 0, ctx->planes[p].pitch * ctx->planes[p].height);
198 memset(ctx->planes[p].pixels[1], 0, ctx->planes[p].pitch * ctx->planes[p].height);
205 static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)
212 for (p = 0; p < 3; p++) {
213 av_freep(&ctx->planes[p].buffers[0]);
214 av_freep(&ctx->planes[p].buffers[1]);
215 ctx->planes[p].pixels[0] = ctx->planes[p].pixels[1] = 0;
221 * Copy pixels of the cell(x + mv_x, y + mv_y) from the previous frame into
222 * the cell(x, y) in the current frame.
224 * @param ctx pointer to the decoder context
225 * @param plane pointer to the plane descriptor
226 * @param cell pointer to the cell descriptor
228 static void copy_cell(Indeo3DecodeContext *ctx, Plane *plane, Cell *cell)
230 int h, w, mv_x, mv_y, offset, offset_dst;
233 /* setup output and reference pointers */
234 offset_dst = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
235 dst = plane->pixels[ctx->buf_sel] + offset_dst;
237 mv_y = cell->mv_ptr[0];
238 mv_x = cell->mv_ptr[1];
241 offset = offset_dst + mv_y * plane->pitch + mv_x;
242 src = plane->pixels[ctx->buf_sel ^ 1] + offset;
244 h = cell->height << 2;
246 for (w = cell->width; w > 0;) {
247 /* copy using 16xH blocks */
248 if (!((cell->xpos << 2) & 15) && w >= 4) {
249 for (; w >= 4; src += 16, dst += 16, w -= 4)
250 ctx->dsp.put_no_rnd_pixels_tab[0][0](dst, src, plane->pitch, h);
253 /* copy using 8xH blocks */
254 if (!((cell->xpos << 2) & 7) && w >= 2) {
255 ctx->dsp.put_no_rnd_pixels_tab[1][0](dst, src, plane->pitch, h);
262 copy_block4(dst, src, plane->pitch, plane->pitch, h);
271 /* Average 4/8 pixels at once without rounding using SWAR */
272 #define AVG_32(dst, src, ref) \
273 AV_WN32A(dst, ((AV_RN32A(src) + AV_RN32A(ref)) >> 1) & 0x7F7F7F7FUL)
275 #define AVG_64(dst, src, ref) \
276 AV_WN64A(dst, ((AV_RN64A(src) + AV_RN64A(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)
280 * Replicate each even pixel as follows:
281 * ABCDEFGH -> AACCEEGG
283 static inline uint64_t replicate64(uint64_t a) {
285 a &= 0xFF00FF00FF00FF00ULL;
288 a &= 0x00FF00FF00FF00FFULL;
294 static inline uint32_t replicate32(uint32_t a) {
306 /* Fill n lines with 64bit pixel value pix */
307 static inline void fill_64(uint8_t *dst, const uint64_t pix, int32_t n,
310 for (; n > 0; dst += row_offset, n--)
315 /* Error codes for cell decoding. */
326 #define BUFFER_PRECHECK \
327 if (*data_ptr >= last_ptr) \
328 return IV3_OUT_OF_DATA; \
330 #define RLE_BLOCK_COPY \
331 if (cell->mv_ptr || !skip_flag) \
332 copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom)
334 #define RLE_BLOCK_COPY_8 \
335 pix64 = AV_RN64A(ref);\
336 if (is_first_row) {/* special prediction case: top line of a cell */\
337 pix64 = replicate64(pix64);\
338 fill_64(dst + row_offset, pix64, 7, row_offset);\
339 AVG_64(dst, ref, dst + row_offset);\
341 fill_64(dst, pix64, 8, row_offset)
343 #define RLE_LINES_COPY \
344 copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom)
346 #define RLE_LINES_COPY_M10 \
347 pix64 = AV_RN64A(ref);\
348 if (is_top_of_cell) {\
349 pix64 = replicate64(pix64);\
350 fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\
351 AVG_64(dst, ref, dst + row_offset);\
353 fill_64(dst, pix64, num_lines << 1, row_offset)
355 #define APPLY_DELTA_4 \
356 AV_WN16A(dst + line_offset ,\
357 (AV_RN16A(ref ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
358 AV_WN16A(dst + line_offset + 2,\
359 (AV_RN16A(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
361 if (is_top_of_cell && !cell->ypos) {\
362 AV_COPY32(dst, dst + row_offset);\
364 AVG_32(dst, ref, dst + row_offset);\
368 #define APPLY_DELTA_8 \
369 /* apply two 32-bit VQ deltas to next even line */\
370 if (is_top_of_cell) { \
371 AV_WN32A(dst + row_offset , \
372 (replicate32(AV_RN32A(ref )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
373 AV_WN32A(dst + row_offset + 4, \
374 (replicate32(AV_RN32A(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
376 AV_WN32A(dst + row_offset , \
377 (AV_RN32A(ref ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
378 AV_WN32A(dst + row_offset + 4, \
379 (AV_RN32A(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
381 /* odd lines are not coded but rather interpolated/replicated */\
382 /* first line of the cell on the top of image? - replicate */\
383 /* otherwise - interpolate */\
384 if (is_top_of_cell && !cell->ypos) {\
385 AV_COPY64(dst, dst + row_offset);\
387 AVG_64(dst, ref, dst + row_offset);
390 #define APPLY_DELTA_1011_INTER \
393 (AV_RN32A(dst ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
395 (AV_RN32A(dst + 4 ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
396 AV_WN32A(dst + row_offset , \
397 (AV_RN32A(dst + row_offset ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
398 AV_WN32A(dst + row_offset + 4, \
399 (AV_RN32A(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
402 (AV_RN16A(dst ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
404 (AV_RN16A(dst + 2 ) + delta_tab->deltas[dyad2]) & 0x7F7F);\
405 AV_WN16A(dst + row_offset , \
406 (AV_RN16A(dst + row_offset ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
407 AV_WN16A(dst + row_offset + 2, \
408 (AV_RN16A(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
412 static int decode_cell_data(Cell *cell, uint8_t *block, uint8_t *ref_block,
413 int pitch, int h_zoom, int v_zoom, int mode,
414 const vqEntry *delta[2], int swap_quads[2],
415 const uint8_t **data_ptr, const uint8_t *last_ptr)
417 int x, y, line, num_lines;
419 uint8_t code, *dst, *ref;
420 const vqEntry *delta_tab;
421 unsigned int dyad1, dyad2;
423 int skip_flag = 0, is_top_of_cell, is_first_row = 1;
424 int row_offset, blk_row_offset, line_offset;
427 blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2);
428 line_offset = v_zoom ? row_offset : 0;
430 for (y = 0; y + v_zoom < cell->height; is_first_row = 0, y += 1 + v_zoom) {
431 for (x = 0; x + h_zoom < cell->width; x += 1 + h_zoom) {
435 if (rle_blocks > 0) {
438 } else if (mode == 10 && !cell->mv_ptr) {
443 for (line = 0; line < 4;) {
445 is_top_of_cell = is_first_row && !line;
447 /* select primary VQ table for odd, secondary for even lines */
449 delta_tab = delta[line & 1];
451 delta_tab = delta[1];
453 code = bytestream_get_byte(data_ptr);
455 if (code < delta_tab->num_dyads) {
457 dyad1 = bytestream_get_byte(data_ptr);
459 if (dyad1 >= delta_tab->num_dyads || dyad1 >= 248)
463 code -= delta_tab->num_dyads;
464 dyad1 = code / delta_tab->quad_exp;
465 dyad2 = code % delta_tab->quad_exp;
466 if (swap_quads[line & 1])
467 FFSWAP(unsigned int, dyad1, dyad2);
471 } else if (mode == 10 && !cell->mv_ptr) {
474 APPLY_DELTA_1011_INTER;
477 /* process RLE codes */
487 num_lines = 257 - code - line;
492 } else if (mode == 10 && !cell->mv_ptr) {
498 code = bytestream_get_byte(data_ptr);
499 rle_blocks = (code & 0x1F) - 1; /* set block counter */
500 if (code >= 64 || rle_blocks < 0)
501 return IV3_BAD_COUNTER;
502 skip_flag = code & 0x20;
503 num_lines = 4 - line; /* enforce next block processing */
504 if (mode >= 10 || (cell->mv_ptr || !skip_flag)) {
507 } else if (mode == 10 && !cell->mv_ptr) {
519 num_lines = 4; /* enforce next block processing */
523 } else if (mode == 10 && !cell->mv_ptr) {
529 return IV3_UNSUPPORTED;
534 ref += row_offset * (num_lines << v_zoom);
535 dst += row_offset * (num_lines << v_zoom);
539 /* move to next horizontal block */
540 block += 4 << h_zoom;
541 ref_block += 4 << h_zoom;
544 /* move to next line of blocks */
545 ref_block += blk_row_offset;
546 block += blk_row_offset;
553 * Decode a vector-quantized cell.
554 * It consists of several routines, each of which handles one or more "modes"
555 * with which a cell can be encoded.
557 * @param ctx pointer to the decoder context
558 * @param avctx ptr to the AVCodecContext
559 * @param plane pointer to the plane descriptor
560 * @param cell pointer to the cell descriptor
561 * @param data_ptr pointer to the compressed data
562 * @param last_ptr pointer to the last byte to catch reads past end of buffer
563 * @return number of consumed bytes or negative number in case of error
565 static int decode_cell(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
566 Plane *plane, Cell *cell, const uint8_t *data_ptr,
567 const uint8_t *last_ptr)
569 int x, mv_x, mv_y, mode, vq_index, prim_indx, second_indx;
571 int offset, error = 0, swap_quads[2];
572 uint8_t code, *block, *ref_block = 0;
573 const vqEntry *delta[2];
574 const uint8_t *data_start = data_ptr;
576 /* get coding mode and VQ table index from the VQ descriptor byte */
579 vq_index = code & 0xF;
581 /* setup output and reference pointers */
582 offset = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
583 block = plane->pixels[ctx->buf_sel] + offset;
586 mv_y = cell->mv_ptr[0];
587 mv_x = cell->mv_ptr[1];
588 if ( mv_x + 4*cell->xpos < 0
589 || mv_y + 4*cell->ypos < 0
590 || mv_x + 4*cell->xpos + 4*cell->width > plane->width
591 || mv_y + 4*cell->ypos + 4*cell->height > plane->height) {
592 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", mv_x + 4*cell->xpos, mv_y + 4*cell->ypos);
593 return AVERROR_INVALIDDATA;
598 /* use previous line as reference for INTRA cells */
599 ref_block = block - plane->pitch;
600 } else if (mode >= 10) {
601 /* for mode 10 and 11 INTER first copy the predicted cell into the current one */
602 /* so we don't need to do data copying for each RLE code later */
603 copy_cell(ctx, plane, cell);
605 /* set the pointer to the reference pixels for modes 0-4 INTER */
606 mv_y = cell->mv_ptr[0];
607 mv_x = cell->mv_ptr[1];
608 offset += mv_y * plane->pitch + mv_x;
609 ref_block = plane->pixels[ctx->buf_sel ^ 1] + offset;
612 /* select VQ tables as follows: */
613 /* modes 0 and 3 use only the primary table for all lines in a block */
614 /* while modes 1 and 4 switch between primary and secondary tables on alternate lines */
615 if (mode == 1 || mode == 4) {
616 code = ctx->alt_quant[vq_index];
617 prim_indx = (code >> 4) + ctx->cb_offset;
618 second_indx = (code & 0xF) + ctx->cb_offset;
620 vq_index += ctx->cb_offset;
621 prim_indx = second_indx = vq_index;
624 if (prim_indx >= 24 || second_indx >= 24) {
625 av_log(avctx, AV_LOG_ERROR, "Invalid VQ table indexes! Primary: %d, secondary: %d!\n",
626 prim_indx, second_indx);
627 return AVERROR_INVALIDDATA;
630 delta[0] = &vq_tab[second_indx];
631 delta[1] = &vq_tab[prim_indx];
632 swap_quads[0] = second_indx >= 16;
633 swap_quads[1] = prim_indx >= 16;
635 /* requantize the prediction if VQ index of this cell differs from VQ index */
636 /* of the predicted cell in order to avoid overflows. */
637 if (vq_index >= 8 && ref_block) {
638 for (x = 0; x < cell->width << 2; x++)
639 ref_block[x] = requant_tab[vq_index & 7][ref_block[x] & 127];
645 case 0: /*------------------ MODES 0 & 1 (4x4 block processing) --------------------*/
647 case 3: /*------------------ MODES 3 & 4 (4x8 block processing) --------------------*/
649 if (mode >= 3 && cell->mv_ptr) {
650 av_log(avctx, AV_LOG_ERROR, "Attempt to apply Mode 3/4 to an INTER cell!\n");
651 return AVERROR_INVALIDDATA;
654 zoom_fac = mode >= 3;
655 error = decode_cell_data(cell, block, ref_block, plane->pitch, 0, zoom_fac,
656 mode, delta, swap_quads, &data_ptr, last_ptr);
658 case 10: /*-------------------- MODE 10 (8x8 block processing) ---------------------*/
659 case 11: /*----------------- MODE 11 (4x8 INTER block processing) ------------------*/
660 if (mode == 10 && !cell->mv_ptr) { /* MODE 10 INTRA processing */
661 error = decode_cell_data(cell, block, ref_block, plane->pitch, 1, 1,
662 mode, delta, swap_quads, &data_ptr, last_ptr);
663 } else { /* mode 10 and 11 INTER processing */
664 if (mode == 11 && !cell->mv_ptr) {
665 av_log(avctx, AV_LOG_ERROR, "Attempt to use Mode 11 for an INTRA cell!\n");
666 return AVERROR_INVALIDDATA;
669 zoom_fac = mode == 10;
670 error = decode_cell_data(cell, block, ref_block, plane->pitch,
671 zoom_fac, 1, mode, delta, swap_quads,
672 &data_ptr, last_ptr);
676 av_log(avctx, AV_LOG_ERROR, "Unsupported coding mode: %d\n", mode);
677 return AVERROR_INVALIDDATA;
682 av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE code %X is not allowed at the current line\n",
684 return AVERROR_INVALIDDATA;
686 av_log(avctx, AV_LOG_ERROR, "Mode %d: invalid VQ data\n", mode);
687 return AVERROR_INVALIDDATA;
688 case IV3_BAD_COUNTER:
689 av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE-FB invalid counter: %d\n", mode, code);
690 return AVERROR_INVALIDDATA;
691 case IV3_UNSUPPORTED:
692 av_log(avctx, AV_LOG_ERROR, "Mode %d: unsupported RLE code: %X\n", mode, data_ptr[-1]);
693 return AVERROR_INVALIDDATA;
694 case IV3_OUT_OF_DATA:
695 av_log(avctx, AV_LOG_ERROR, "Mode %d: attempt to read past end of buffer\n", mode);
696 return AVERROR_INVALIDDATA;
699 return data_ptr - data_start; /* report number of bytes consumed from the input buffer */
703 /* Binary tree codes. */
712 #define SPLIT_CELL(size, new_size) (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1
714 #define UPDATE_BITPOS(n) \
715 ctx->skip_bits += (n); \
718 #define RESYNC_BITSTREAM \
719 if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \
720 skip_bits_long(&ctx->gb, ctx->skip_bits); \
721 ctx->skip_bits = 0; \
722 ctx->need_resync = 0; \
726 if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) || \
727 curr_cell.ypos + curr_cell.height > (plane->height >> 2)) { \
728 av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n", \
729 curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \
730 return AVERROR_INVALIDDATA; \
734 static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
735 Plane *plane, int code, Cell *ref_cell,
736 const int depth, const int strip_width)
743 av_log(avctx, AV_LOG_ERROR, "Stack overflow (corrupted binary tree)!\n");
744 return AVERROR_INVALIDDATA; // unwind recursion
747 curr_cell = *ref_cell; // clone parent cell
748 if (code == H_SPLIT) {
749 SPLIT_CELL(ref_cell->height, curr_cell.height);
750 ref_cell->ypos += curr_cell.height;
751 ref_cell->height -= curr_cell.height;
752 if (ref_cell->height <= 0 || curr_cell.height <= 0)
753 return AVERROR_INVALIDDATA;
754 } else if (code == V_SPLIT) {
755 if (curr_cell.width > strip_width) {
757 curr_cell.width = (curr_cell.width <= (strip_width << 1) ? 1 : 2) * strip_width;
759 SPLIT_CELL(ref_cell->width, curr_cell.width);
760 ref_cell->xpos += curr_cell.width;
761 ref_cell->width -= curr_cell.width;
762 if (ref_cell->width <= 0 || curr_cell.width <= 0)
763 return AVERROR_INVALIDDATA;
766 while (get_bits_left(&ctx->gb) >= 2) { /* loop until return */
768 switch (code = get_bits(&ctx->gb, 2)) {
771 if (parse_bintree(ctx, avctx, plane, code, &curr_cell, depth - 1, strip_width))
772 return AVERROR_INVALIDDATA;
775 if (!curr_cell.tree) { /* MC tree INTRA code */
776 curr_cell.mv_ptr = 0; /* mark the current strip as INTRA */
777 curr_cell.tree = 1; /* enter the VQ tree */
778 } else { /* VQ tree NULL code */
780 code = get_bits(&ctx->gb, 2);
782 av_log(avctx, AV_LOG_ERROR, "Invalid VQ_NULL code: %d\n", code);
783 return AVERROR_INVALIDDATA;
786 av_log(avctx, AV_LOG_ERROR, "SkipCell procedure not implemented yet!\n");
789 if (!curr_cell.mv_ptr)
790 return AVERROR_INVALIDDATA;
792 mv_y = curr_cell.mv_ptr[0];
793 mv_x = curr_cell.mv_ptr[1];
794 if ( mv_x + 4*curr_cell.xpos < 0
795 || mv_y + 4*curr_cell.ypos < 0
796 || mv_x + 4*curr_cell.xpos + 4*curr_cell.width > plane->width
797 || mv_y + 4*curr_cell.ypos + 4*curr_cell.height > plane->height) {
798 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);
799 return AVERROR_INVALIDDATA;
802 copy_cell(ctx, plane, &curr_cell);
807 if (!curr_cell.tree) { /* MC tree INTER code */
809 /* get motion vector index and setup the pointer to the mv set */
810 if (!ctx->need_resync)
811 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
812 if (ctx->next_cell_data >= ctx->last_byte) {
813 av_log(avctx, AV_LOG_ERROR, "motion vector out of array\n");
814 return AVERROR_INVALIDDATA;
816 mv_idx = *(ctx->next_cell_data++);
817 if (mv_idx >= ctx->num_vectors) {
818 av_log(avctx, AV_LOG_ERROR, "motion vector index out of range\n");
819 return AVERROR_INVALIDDATA;
821 curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx << 1];
822 curr_cell.tree = 1; /* enter the VQ tree */
824 } else { /* VQ tree DATA code */
825 if (!ctx->need_resync)
826 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
829 bytes_used = decode_cell(ctx, avctx, plane, &curr_cell,
830 ctx->next_cell_data, ctx->last_byte);
832 return AVERROR_INVALIDDATA;
834 UPDATE_BITPOS(bytes_used << 3);
835 ctx->next_cell_data += bytes_used;
842 return AVERROR_INVALIDDATA;
846 static int decode_plane(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
847 Plane *plane, const uint8_t *data, int32_t data_size,
851 unsigned num_vectors;
853 /* each plane data starts with mc_vector_count field, */
854 /* an optional array of motion vectors followed by the vq data */
855 num_vectors = bytestream_get_le32(&data); data_size -= 4;
856 if (num_vectors > 256) {
857 av_log(ctx->avctx, AV_LOG_ERROR,
858 "Read invalid number of motion vectors %d\n", num_vectors);
859 return AVERROR_INVALIDDATA;
861 if (num_vectors * 2 > data_size)
862 return AVERROR_INVALIDDATA;
864 ctx->num_vectors = num_vectors;
865 ctx->mc_vectors = num_vectors ? data : 0;
867 /* init the bitreader */
868 init_get_bits(&ctx->gb, &data[num_vectors * 2], (data_size - num_vectors * 2) << 3);
870 ctx->need_resync = 0;
872 ctx->last_byte = data + data_size;
874 /* initialize the 1st cell and set its dimensions to whole plane */
875 curr_cell.xpos = curr_cell.ypos = 0;
876 curr_cell.width = plane->width >> 2;
877 curr_cell.height = plane->height >> 2;
878 curr_cell.tree = 0; // we are in the MC tree now
879 curr_cell.mv_ptr = 0; // no motion vector = INTRA cell
881 return parse_bintree(ctx, avctx, plane, INTRA_NULL, &curr_cell, CELL_STACK_MAX, strip_width);
885 #define OS_HDR_ID MKBETAG('F', 'R', 'M', 'H')
887 static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
888 const uint8_t *buf, int buf_size)
890 const uint8_t *buf_ptr = buf, *bs_hdr;
891 uint32_t frame_num, word2, check_sum, data_size;
892 uint32_t y_offset, u_offset, v_offset, starts[3], ends[3];
893 uint16_t height, width;
896 /* parse and check the OS header */
897 frame_num = bytestream_get_le32(&buf_ptr);
898 word2 = bytestream_get_le32(&buf_ptr);
899 check_sum = bytestream_get_le32(&buf_ptr);
900 data_size = bytestream_get_le32(&buf_ptr);
902 if ((frame_num ^ word2 ^ data_size ^ OS_HDR_ID) != check_sum) {
903 av_log(avctx, AV_LOG_ERROR, "OS header checksum mismatch!\n");
904 return AVERROR_INVALIDDATA;
907 /* parse the bitstream header */
911 if (bytestream_get_le16(&buf_ptr) != 32) {
912 av_log(avctx, AV_LOG_ERROR, "Unsupported codec version!\n");
913 return AVERROR_INVALIDDATA;
916 ctx->frame_num = frame_num;
917 ctx->frame_flags = bytestream_get_le16(&buf_ptr);
918 ctx->data_size = (bytestream_get_le32(&buf_ptr) + 7) >> 3;
919 ctx->cb_offset = *buf_ptr++;
921 if (ctx->data_size == 16)
923 if (ctx->data_size > buf_size)
924 ctx->data_size = buf_size;
926 buf_ptr += 3; // skip reserved byte and checksum
928 /* check frame dimensions */
929 height = bytestream_get_le16(&buf_ptr);
930 width = bytestream_get_le16(&buf_ptr);
931 if (av_image_check_size(width, height, 0, avctx))
932 return AVERROR_INVALIDDATA;
934 if (width != ctx->width || height != ctx->height) {
937 av_dlog(avctx, "Frame dimensions changed!\n");
939 if (width < 16 || width > 640 ||
940 height < 16 || height > 480 ||
941 width & 3 || height & 3) {
942 av_log(avctx, AV_LOG_ERROR,
943 "Invalid picture dimensions: %d x %d!\n", width, height);
944 return AVERROR_INVALIDDATA;
946 free_frame_buffers(ctx);
947 if ((res = allocate_frame_buffers(ctx, avctx, width, height)) < 0)
949 avcodec_set_dimensions(avctx, width, height);
952 y_offset = bytestream_get_le32(&buf_ptr);
953 v_offset = bytestream_get_le32(&buf_ptr);
954 u_offset = bytestream_get_le32(&buf_ptr);
956 /* unfortunately there is no common order of planes in the buffer */
957 /* so we use that sorting algo for determining planes data sizes */
958 starts[0] = y_offset;
959 starts[1] = v_offset;
960 starts[2] = u_offset;
962 for (j = 0; j < 3; j++) {
963 ends[j] = ctx->data_size;
964 for (i = 2; i >= 0; i--)
965 if (starts[i] < ends[j] && starts[i] > starts[j])
969 ctx->y_data_size = ends[0] - starts[0];
970 ctx->v_data_size = ends[1] - starts[1];
971 ctx->u_data_size = ends[2] - starts[2];
972 if (FFMAX3(y_offset, v_offset, u_offset) >= ctx->data_size - 16 ||
973 FFMIN3(ctx->y_data_size, ctx->v_data_size, ctx->u_data_size) <= 0) {
974 av_log(avctx, AV_LOG_ERROR, "One of the y/u/v offsets is invalid\n");
975 return AVERROR_INVALIDDATA;
978 ctx->y_data_ptr = bs_hdr + y_offset;
979 ctx->v_data_ptr = bs_hdr + v_offset;
980 ctx->u_data_ptr = bs_hdr + u_offset;
981 ctx->alt_quant = buf_ptr + sizeof(uint32_t);
983 if (ctx->data_size == 16) {
984 av_log(avctx, AV_LOG_DEBUG, "Sync frame encountered!\n");
988 if (ctx->frame_flags & BS_8BIT_PEL) {
989 av_log_ask_for_sample(avctx, "8-bit pixel format\n");
990 return AVERROR_PATCHWELCOME;
993 if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {
994 av_log_ask_for_sample(avctx, "halfpel motion vectors\n");
995 return AVERROR_PATCHWELCOME;
1003 * Convert and output the current plane.
1004 * All pixel values will be upsampled by shifting right by one bit.
1006 * @param[in] plane pointer to the descriptor of the plane being processed
1007 * @param[in] buf_sel indicates which frame buffer the input data stored in
1008 * @param[out] dst pointer to the buffer receiving converted pixels
1009 * @param[in] dst_pitch pitch for moving to the next y line
1011 static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst, int dst_pitch)
1014 const uint8_t *src = plane->pixels[buf_sel];
1015 uint32_t pitch = plane->pitch;
1017 for (y = 0; y < plane->height; y++) {
1018 /* convert four pixels at once using SWAR */
1019 for (x = 0; x < plane->width >> 2; x++) {
1020 AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);
1025 for (x <<= 2; x < plane->width; x++)
1026 *dst++ = *src++ << 1;
1028 src += pitch - plane->width;
1029 dst += dst_pitch - plane->width;
1034 static av_cold int decode_init(AVCodecContext *avctx)
1036 Indeo3DecodeContext *ctx = avctx->priv_data;
1039 avctx->pix_fmt = PIX_FMT_YUV410P;
1040 avcodec_get_frame_defaults(&ctx->frame);
1042 build_requant_tab();
1044 ff_dsputil_init(&ctx->dsp, avctx);
1046 return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height);
1050 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1053 Indeo3DecodeContext *ctx = avctx->priv_data;
1054 const uint8_t *buf = avpkt->data;
1055 int buf_size = avpkt->size;
1058 res = decode_frame_headers(ctx, avctx, buf, buf_size);
1062 /* skip sync(null) frames */
1064 // we have processed 16 bytes but no data was decoded
1069 /* skip droppable INTER frames if requested */
1070 if (ctx->frame_flags & BS_NONREF &&
1071 (avctx->skip_frame >= AVDISCARD_NONREF))
1074 /* skip INTER frames if requested */
1075 if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)
1078 /* use BS_BUFFER flag for buffer switching */
1079 ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;
1081 /* decode luma plane */
1082 if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))
1085 /* decode chroma planes */
1086 if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))
1089 if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))
1092 if (ctx->frame.data[0])
1093 avctx->release_buffer(avctx, &ctx->frame);
1095 ctx->frame.reference = 0;
1096 if ((res = avctx->get_buffer(avctx, &ctx->frame)) < 0) {
1097 av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1101 output_plane(&ctx->planes[0], ctx->buf_sel, ctx->frame.data[0], ctx->frame.linesize[0]);
1102 output_plane(&ctx->planes[1], ctx->buf_sel, ctx->frame.data[1], ctx->frame.linesize[1]);
1103 output_plane(&ctx->planes[2], ctx->buf_sel, ctx->frame.data[2], ctx->frame.linesize[2]);
1105 *data_size = sizeof(AVFrame);
1106 *(AVFrame*)data = ctx->frame;
1112 static av_cold int decode_close(AVCodecContext *avctx)
1114 Indeo3DecodeContext *ctx = avctx->priv_data;
1116 free_frame_buffers(avctx->priv_data);
1118 if (ctx->frame.data[0])
1119 avctx->release_buffer(avctx, &ctx->frame);
1124 AVCodec ff_indeo3_decoder = {
1126 .type = AVMEDIA_TYPE_VIDEO,
1127 .id = AV_CODEC_ID_INDEO3,
1128 .priv_data_size = sizeof(Indeo3DecodeContext),
1129 .init = decode_init,
1130 .close = decode_close,
1131 .decode = decode_frame,
1132 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),