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"
40 #include "indeo3data.h"
44 RLE_ESC_F9 = 249, ///< same as RLE_ESC_FA + do the same with next block
45 RLE_ESC_FA = 250, ///< INTRA: skip block, INTER: copy data from reference
46 RLE_ESC_FB = 251, ///< apply null delta to N blocks / skip N blocks
47 RLE_ESC_FC = 252, ///< same as RLE_ESC_FD + do the same with next block
48 RLE_ESC_FD = 253, ///< apply null delta to all remaining lines of this block
49 RLE_ESC_FE = 254, ///< apply null delta to all lines up to the 3rd line
50 RLE_ESC_FF = 255 ///< apply null delta to all lines up to the 2nd line
54 /* Some constants for parsing frame bitstream flags. */
55 #define BS_8BIT_PEL (1 << 1) ///< 8bit pixel bitdepth indicator
56 #define BS_KEYFRAME (1 << 2) ///< intra frame indicator
57 #define BS_MV_Y_HALF (1 << 4) ///< vertical mv halfpel resolution indicator
58 #define BS_MV_X_HALF (1 << 5) ///< horizontal mv halfpel resolution indicator
59 #define BS_NONREF (1 << 8) ///< nonref (discardable) frame indicator
60 #define BS_BUFFER 9 ///< indicates which of two frame buffers should be used
63 typedef struct Plane {
65 uint8_t *pixels[2]; ///< pointer to the actual pixel data of the buffers above
71 #define CELL_STACK_MAX 20
74 int16_t xpos; ///< cell coordinates in 4x4 blocks
76 int16_t width; ///< cell width in 4x4 blocks
77 int16_t height; ///< cell height in 4x4 blocks
78 uint8_t tree; ///< tree id: 0- MC tree, 1 - VQ tree
79 const int8_t *mv_ptr; ///< ptr to the motion vector if any
82 typedef struct Indeo3DecodeContext {
83 AVCodecContext *avctx;
90 const uint8_t *next_cell_data;
91 const uint8_t *last_byte;
92 const int8_t *mc_vectors;
93 unsigned num_vectors; ///< number of motion vectors in mc_vectors
95 int16_t width, height;
96 uint32_t frame_num; ///< current frame number (zero-based)
97 uint32_t data_size; ///< size of the frame data in bytes
98 uint16_t frame_flags; ///< frame properties
99 uint8_t cb_offset; ///< needed for selecting VQ tables
100 uint8_t buf_sel; ///< active frame buffer: 0 - primary, 1 -secondary
101 const uint8_t *y_data_ptr;
102 const uint8_t *v_data_ptr;
103 const uint8_t *u_data_ptr;
107 const uint8_t *alt_quant; ///< secondary VQ table set for the modes 1 and 4
109 } Indeo3DecodeContext;
112 static uint8_t requant_tab[8][128];
115 * Build the static requantization table.
116 * This table is used to remap pixel values according to a specific
117 * quant index and thus avoid overflows while adding deltas.
119 static av_cold void build_requant_tab(void)
121 static int8_t offsets[8] = { 1, 1, 2, -3, -3, 3, 4, 4 };
122 static int8_t deltas [8] = { 0, 1, 0, 4, 4, 1, 0, 1 };
126 for (i = 0; i < 8; i++) {
128 for (j = 0; j < 128; j++)
129 requant_tab[i][j] = (j + offsets[i]) / step * step + deltas[i];
132 /* some last elements calculated above will have values >= 128 */
133 /* pixel values shall never exceed 127 so set them to non-overflowing values */
134 /* according with the quantization step of the respective section */
135 requant_tab[0][127] = 126;
136 requant_tab[1][119] = 118;
137 requant_tab[1][120] = 118;
138 requant_tab[2][126] = 124;
139 requant_tab[2][127] = 124;
140 requant_tab[6][124] = 120;
141 requant_tab[6][125] = 120;
142 requant_tab[6][126] = 120;
143 requant_tab[6][127] = 120;
145 /* Patch for compatibility with the Intel's binary decoders */
146 requant_tab[1][7] = 10;
147 requant_tab[4][8] = 10;
151 static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,
152 AVCodecContext *avctx, int luma_width, int luma_height)
154 int p, chroma_width, chroma_height;
155 int luma_pitch, chroma_pitch, luma_size, chroma_size;
157 if (luma_width < 16 || luma_width > 640 ||
158 luma_height < 16 || luma_height > 480 ||
159 luma_width & 3 || luma_height & 3) {
160 av_log(avctx, AV_LOG_ERROR, "Invalid picture dimensions: %d x %d!\n",
161 luma_width, luma_height);
162 return AVERROR_INVALIDDATA;
165 ctx->width = luma_width ;
166 ctx->height = luma_height;
168 chroma_width = FFALIGN(luma_width >> 2, 4);
169 chroma_height = FFALIGN(luma_height >> 2, 4);
171 luma_pitch = FFALIGN(luma_width, 16);
172 chroma_pitch = FFALIGN(chroma_width, 16);
174 /* Calculate size of the luminance plane. */
175 /* Add one line more for INTRA prediction. */
176 luma_size = luma_pitch * (luma_height + 1);
178 /* Calculate size of a chrominance planes. */
179 /* Add one line more for INTRA prediction. */
180 chroma_size = chroma_pitch * (chroma_height + 1);
182 /* allocate frame buffers */
183 for (p = 0; p < 3; p++) {
184 ctx->planes[p].pitch = !p ? luma_pitch : chroma_pitch;
185 ctx->planes[p].width = !p ? luma_width : chroma_width;
186 ctx->planes[p].height = !p ? luma_height : chroma_height;
188 ctx->planes[p].buffers[0] = av_malloc(!p ? luma_size : chroma_size);
189 ctx->planes[p].buffers[1] = av_malloc(!p ? luma_size : chroma_size);
191 /* fill the INTRA prediction lines with the middle pixel value = 64 */
192 memset(ctx->planes[p].buffers[0], 0x40, ctx->planes[p].pitch);
193 memset(ctx->planes[p].buffers[1], 0x40, ctx->planes[p].pitch);
195 /* set buffer pointers = buf_ptr + pitch and thus skip the INTRA prediction line */
196 ctx->planes[p].pixels[0] = ctx->planes[p].buffers[0] + ctx->planes[p].pitch;
197 ctx->planes[p].pixels[1] = ctx->planes[p].buffers[1] + ctx->planes[p].pitch;
198 memset(ctx->planes[p].pixels[0], 0, ctx->planes[p].pitch * ctx->planes[p].height);
199 memset(ctx->planes[p].pixels[1], 0, ctx->planes[p].pitch * ctx->planes[p].height);
206 static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)
213 for (p = 0; p < 3; p++) {
214 av_freep(&ctx->planes[p].buffers[0]);
215 av_freep(&ctx->planes[p].buffers[1]);
216 ctx->planes[p].pixels[0] = ctx->planes[p].pixels[1] = 0;
222 * Copy pixels of the cell(x + mv_x, y + mv_y) from the previous frame into
223 * the cell(x, y) in the current frame.
225 * @param ctx pointer to the decoder context
226 * @param plane pointer to the plane descriptor
227 * @param cell pointer to the cell descriptor
229 static void copy_cell(Indeo3DecodeContext *ctx, Plane *plane, Cell *cell)
231 int h, w, mv_x, mv_y, offset, offset_dst;
234 /* setup output and reference pointers */
235 offset_dst = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
236 dst = plane->pixels[ctx->buf_sel] + offset_dst;
238 mv_y = cell->mv_ptr[0];
239 mv_x = cell->mv_ptr[1];
242 offset = offset_dst + mv_y * plane->pitch + mv_x;
243 src = plane->pixels[ctx->buf_sel ^ 1] + offset;
245 h = cell->height << 2;
247 for (w = cell->width; w > 0;) {
248 /* copy using 16xH blocks */
249 if (!((cell->xpos << 2) & 15) && w >= 4) {
250 for (; w >= 4; src += 16, dst += 16, w -= 4)
251 ctx->dsp.put_no_rnd_pixels_tab[0][0](dst, src, plane->pitch, h);
254 /* copy using 8xH blocks */
255 if (!((cell->xpos << 2) & 7) && w >= 2) {
256 ctx->dsp.put_no_rnd_pixels_tab[1][0](dst, src, plane->pitch, h);
263 copy_block4(dst, src, plane->pitch, plane->pitch, h);
272 /* Average 4/8 pixels at once without rounding using SWAR */
273 #define AVG_32(dst, src, ref) \
274 AV_WN32A(dst, ((AV_RN32A(src) + AV_RN32A(ref)) >> 1) & 0x7F7F7F7FUL)
276 #define AVG_64(dst, src, ref) \
277 AV_WN64A(dst, ((AV_RN64A(src) + AV_RN64A(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)
281 * Replicate each even pixel as follows:
282 * ABCDEFGH -> AACCEEGG
284 static inline uint64_t replicate64(uint64_t a) {
286 a &= 0xFF00FF00FF00FF00ULL;
289 a &= 0x00FF00FF00FF00FFULL;
295 static inline uint32_t replicate32(uint32_t a) {
307 /* Fill n lines with 64bit pixel value pix */
308 static inline void fill_64(uint8_t *dst, const uint64_t pix, int32_t n,
311 for (; n > 0; dst += row_offset, n--)
316 /* Error codes for cell decoding. */
327 #define BUFFER_PRECHECK \
328 if (*data_ptr >= last_ptr) \
329 return IV3_OUT_OF_DATA; \
331 #define RLE_BLOCK_COPY \
332 if (cell->mv_ptr || !skip_flag) \
333 copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom)
335 #define RLE_BLOCK_COPY_8 \
336 pix64 = AV_RN64A(ref);\
337 if (is_first_row) {/* special prediction case: top line of a cell */\
338 pix64 = replicate64(pix64);\
339 fill_64(dst + row_offset, pix64, 7, row_offset);\
340 AVG_64(dst, ref, dst + row_offset);\
342 fill_64(dst, pix64, 8, row_offset)
344 #define RLE_LINES_COPY \
345 copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom)
347 #define RLE_LINES_COPY_M10 \
348 pix64 = AV_RN64A(ref);\
349 if (is_top_of_cell) {\
350 pix64 = replicate64(pix64);\
351 fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\
352 AVG_64(dst, ref, dst + row_offset);\
354 fill_64(dst, pix64, num_lines << 1, row_offset)
356 #define APPLY_DELTA_4 \
357 AV_WN16A(dst + line_offset ,\
358 (AV_RN16A(ref ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
359 AV_WN16A(dst + line_offset + 2,\
360 (AV_RN16A(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
362 if (is_top_of_cell && !cell->ypos) {\
363 AV_COPY32(dst, dst + row_offset);\
365 AVG_32(dst, ref, dst + row_offset);\
369 #define APPLY_DELTA_8 \
370 /* apply two 32-bit VQ deltas to next even line */\
371 if (is_top_of_cell) { \
372 AV_WN32A(dst + row_offset , \
373 (replicate32(AV_RN32A(ref )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
374 AV_WN32A(dst + row_offset + 4, \
375 (replicate32(AV_RN32A(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
377 AV_WN32A(dst + row_offset , \
378 (AV_RN32A(ref ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
379 AV_WN32A(dst + row_offset + 4, \
380 (AV_RN32A(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
382 /* odd lines are not coded but rather interpolated/replicated */\
383 /* first line of the cell on the top of image? - replicate */\
384 /* otherwise - interpolate */\
385 if (is_top_of_cell && !cell->ypos) {\
386 AV_COPY64(dst, dst + row_offset);\
388 AVG_64(dst, ref, dst + row_offset);
391 #define APPLY_DELTA_1011_INTER \
394 (AV_RN32A(dst ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
396 (AV_RN32A(dst + 4 ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
397 AV_WN32A(dst + row_offset , \
398 (AV_RN32A(dst + row_offset ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
399 AV_WN32A(dst + row_offset + 4, \
400 (AV_RN32A(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
403 (AV_RN16A(dst ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
405 (AV_RN16A(dst + 2 ) + delta_tab->deltas[dyad2]) & 0x7F7F);\
406 AV_WN16A(dst + row_offset , \
407 (AV_RN16A(dst + row_offset ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
408 AV_WN16A(dst + row_offset + 2, \
409 (AV_RN16A(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
413 static int decode_cell_data(Cell *cell, uint8_t *block, uint8_t *ref_block,
414 int pitch, int h_zoom, int v_zoom, int mode,
415 const vqEntry *delta[2], int swap_quads[2],
416 const uint8_t **data_ptr, const uint8_t *last_ptr)
418 int x, y, line, num_lines;
420 uint8_t code, *dst, *ref;
421 const vqEntry *delta_tab;
422 unsigned int dyad1, dyad2;
424 int skip_flag = 0, is_top_of_cell, is_first_row = 1;
425 int row_offset, blk_row_offset, line_offset;
428 blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2);
429 line_offset = v_zoom ? row_offset : 0;
431 if (cell->height & v_zoom || cell->width & h_zoom)
434 for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) {
435 for (x = 0; x < cell->width; x += 1 + h_zoom) {
439 if (rle_blocks > 0) {
442 } else if (mode == 10 && !cell->mv_ptr) {
447 for (line = 0; line < 4;) {
449 is_top_of_cell = is_first_row && !line;
451 /* select primary VQ table for odd, secondary for even lines */
453 delta_tab = delta[line & 1];
455 delta_tab = delta[1];
457 code = bytestream_get_byte(data_ptr);
459 if (code < delta_tab->num_dyads) {
461 dyad1 = bytestream_get_byte(data_ptr);
463 if (dyad1 >= delta_tab->num_dyads || dyad1 >= 248)
467 code -= delta_tab->num_dyads;
468 dyad1 = code / delta_tab->quad_exp;
469 dyad2 = code % delta_tab->quad_exp;
470 if (swap_quads[line & 1])
471 FFSWAP(unsigned int, dyad1, dyad2);
475 } else if (mode == 10 && !cell->mv_ptr) {
478 APPLY_DELTA_1011_INTER;
481 /* process RLE codes */
491 num_lines = 257 - code - line;
496 } else if (mode == 10 && !cell->mv_ptr) {
502 code = bytestream_get_byte(data_ptr);
503 rle_blocks = (code & 0x1F) - 1; /* set block counter */
504 if (code >= 64 || rle_blocks < 0)
505 return IV3_BAD_COUNTER;
506 skip_flag = code & 0x20;
507 num_lines = 4 - line; /* enforce next block processing */
508 if (mode >= 10 || (cell->mv_ptr || !skip_flag)) {
511 } else if (mode == 10 && !cell->mv_ptr) {
523 num_lines = 4; /* enforce next block processing */
527 } else if (mode == 10 && !cell->mv_ptr) {
533 return IV3_UNSUPPORTED;
538 ref += row_offset * (num_lines << v_zoom);
539 dst += row_offset * (num_lines << v_zoom);
543 /* move to next horizontal block */
544 block += 4 << h_zoom;
545 ref_block += 4 << h_zoom;
548 /* move to next line of blocks */
549 ref_block += blk_row_offset;
550 block += blk_row_offset;
557 * Decode a vector-quantized cell.
558 * It consists of several routines, each of which handles one or more "modes"
559 * with which a cell can be encoded.
561 * @param ctx pointer to the decoder context
562 * @param avctx ptr to the AVCodecContext
563 * @param plane pointer to the plane descriptor
564 * @param cell pointer to the cell descriptor
565 * @param data_ptr pointer to the compressed data
566 * @param last_ptr pointer to the last byte to catch reads past end of buffer
567 * @return number of consumed bytes or negative number in case of error
569 static int decode_cell(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
570 Plane *plane, Cell *cell, const uint8_t *data_ptr,
571 const uint8_t *last_ptr)
573 int x, mv_x, mv_y, mode, vq_index, prim_indx, second_indx;
575 int offset, error = 0, swap_quads[2];
576 uint8_t code, *block, *ref_block = 0;
577 const vqEntry *delta[2];
578 const uint8_t *data_start = data_ptr;
580 /* get coding mode and VQ table index from the VQ descriptor byte */
583 vq_index = code & 0xF;
585 /* setup output and reference pointers */
586 offset = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
587 block = plane->pixels[ctx->buf_sel] + offset;
590 mv_y = cell->mv_ptr[0];
591 mv_x = cell->mv_ptr[1];
592 if ( mv_x + 4*cell->xpos < 0
593 || mv_y + 4*cell->ypos < 0
594 || mv_x + 4*cell->xpos + 4*cell->width > plane->width
595 || mv_y + 4*cell->ypos + 4*cell->height > plane->height) {
596 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", mv_x + 4*cell->xpos, mv_y + 4*cell->ypos);
597 return AVERROR_INVALIDDATA;
602 /* use previous line as reference for INTRA cells */
603 ref_block = block - plane->pitch;
604 } else if (mode >= 10) {
605 /* for mode 10 and 11 INTER first copy the predicted cell into the current one */
606 /* so we don't need to do data copying for each RLE code later */
607 copy_cell(ctx, plane, cell);
609 /* set the pointer to the reference pixels for modes 0-4 INTER */
610 mv_y = cell->mv_ptr[0];
611 mv_x = cell->mv_ptr[1];
612 offset += mv_y * plane->pitch + mv_x;
613 ref_block = plane->pixels[ctx->buf_sel ^ 1] + offset;
616 /* select VQ tables as follows: */
617 /* modes 0 and 3 use only the primary table for all lines in a block */
618 /* while modes 1 and 4 switch between primary and secondary tables on alternate lines */
619 if (mode == 1 || mode == 4) {
620 code = ctx->alt_quant[vq_index];
621 prim_indx = (code >> 4) + ctx->cb_offset;
622 second_indx = (code & 0xF) + ctx->cb_offset;
624 vq_index += ctx->cb_offset;
625 prim_indx = second_indx = vq_index;
628 if (prim_indx >= 24 || second_indx >= 24) {
629 av_log(avctx, AV_LOG_ERROR, "Invalid VQ table indexes! Primary: %d, secondary: %d!\n",
630 prim_indx, second_indx);
631 return AVERROR_INVALIDDATA;
634 delta[0] = &vq_tab[second_indx];
635 delta[1] = &vq_tab[prim_indx];
636 swap_quads[0] = second_indx >= 16;
637 swap_quads[1] = prim_indx >= 16;
639 /* requantize the prediction if VQ index of this cell differs from VQ index */
640 /* of the predicted cell in order to avoid overflows. */
641 if (vq_index >= 8 && ref_block) {
642 for (x = 0; x < cell->width << 2; x++)
643 ref_block[x] = requant_tab[vq_index & 7][ref_block[x] & 127];
649 case 0: /*------------------ MODES 0 & 1 (4x4 block processing) --------------------*/
651 case 3: /*------------------ MODES 3 & 4 (4x8 block processing) --------------------*/
653 if (mode >= 3 && cell->mv_ptr) {
654 av_log(avctx, AV_LOG_ERROR, "Attempt to apply Mode 3/4 to an INTER cell!\n");
655 return AVERROR_INVALIDDATA;
658 zoom_fac = mode >= 3;
659 error = decode_cell_data(cell, block, ref_block, plane->pitch, 0, zoom_fac,
660 mode, delta, swap_quads, &data_ptr, last_ptr);
662 case 10: /*-------------------- MODE 10 (8x8 block processing) ---------------------*/
663 case 11: /*----------------- MODE 11 (4x8 INTER block processing) ------------------*/
664 if (mode == 10 && !cell->mv_ptr) { /* MODE 10 INTRA processing */
665 error = decode_cell_data(cell, block, ref_block, plane->pitch, 1, 1,
666 mode, delta, swap_quads, &data_ptr, last_ptr);
667 } else { /* mode 10 and 11 INTER processing */
668 if (mode == 11 && !cell->mv_ptr) {
669 av_log(avctx, AV_LOG_ERROR, "Attempt to use Mode 11 for an INTRA cell!\n");
670 return AVERROR_INVALIDDATA;
673 zoom_fac = mode == 10;
674 error = decode_cell_data(cell, block, ref_block, plane->pitch,
675 zoom_fac, 1, mode, delta, swap_quads,
676 &data_ptr, last_ptr);
680 av_log(avctx, AV_LOG_ERROR, "Unsupported coding mode: %d\n", mode);
681 return AVERROR_INVALIDDATA;
686 av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE code %X is not allowed at the current line\n",
688 return AVERROR_INVALIDDATA;
690 av_log(avctx, AV_LOG_ERROR, "Mode %d: invalid VQ data\n", mode);
691 return AVERROR_INVALIDDATA;
692 case IV3_BAD_COUNTER:
693 av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE-FB invalid counter: %d\n", mode, code);
694 return AVERROR_INVALIDDATA;
695 case IV3_UNSUPPORTED:
696 av_log(avctx, AV_LOG_ERROR, "Mode %d: unsupported RLE code: %X\n", mode, data_ptr[-1]);
697 return AVERROR_INVALIDDATA;
698 case IV3_OUT_OF_DATA:
699 av_log(avctx, AV_LOG_ERROR, "Mode %d: attempt to read past end of buffer\n", mode);
700 return AVERROR_INVALIDDATA;
703 return data_ptr - data_start; /* report number of bytes consumed from the input buffer */
707 /* Binary tree codes. */
716 #define SPLIT_CELL(size, new_size) (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1
718 #define UPDATE_BITPOS(n) \
719 ctx->skip_bits += (n); \
722 #define RESYNC_BITSTREAM \
723 if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \
724 skip_bits_long(&ctx->gb, ctx->skip_bits); \
725 ctx->skip_bits = 0; \
726 ctx->need_resync = 0; \
730 if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) || \
731 curr_cell.ypos + curr_cell.height > (plane->height >> 2)) { \
732 av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n", \
733 curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \
734 return AVERROR_INVALIDDATA; \
738 static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
739 Plane *plane, int code, Cell *ref_cell,
740 const int depth, const int strip_width)
747 av_log(avctx, AV_LOG_ERROR, "Stack overflow (corrupted binary tree)!\n");
748 return AVERROR_INVALIDDATA; // unwind recursion
751 curr_cell = *ref_cell; // clone parent cell
752 if (code == H_SPLIT) {
753 SPLIT_CELL(ref_cell->height, curr_cell.height);
754 ref_cell->ypos += curr_cell.height;
755 ref_cell->height -= curr_cell.height;
756 if (ref_cell->height <= 0 || curr_cell.height <= 0)
757 return AVERROR_INVALIDDATA;
758 } else if (code == V_SPLIT) {
759 if (curr_cell.width > strip_width) {
761 curr_cell.width = (curr_cell.width <= (strip_width << 1) ? 1 : 2) * strip_width;
763 SPLIT_CELL(ref_cell->width, curr_cell.width);
764 ref_cell->xpos += curr_cell.width;
765 ref_cell->width -= curr_cell.width;
766 if (ref_cell->width <= 0 || curr_cell.width <= 0)
767 return AVERROR_INVALIDDATA;
770 while (get_bits_left(&ctx->gb) >= 2) { /* loop until return */
772 switch (code = get_bits(&ctx->gb, 2)) {
775 if (parse_bintree(ctx, avctx, plane, code, &curr_cell, depth - 1, strip_width))
776 return AVERROR_INVALIDDATA;
779 if (!curr_cell.tree) { /* MC tree INTRA code */
780 curr_cell.mv_ptr = 0; /* mark the current strip as INTRA */
781 curr_cell.tree = 1; /* enter the VQ tree */
782 } else { /* VQ tree NULL code */
784 code = get_bits(&ctx->gb, 2);
786 av_log(avctx, AV_LOG_ERROR, "Invalid VQ_NULL code: %d\n", code);
787 return AVERROR_INVALIDDATA;
790 av_log(avctx, AV_LOG_ERROR, "SkipCell procedure not implemented yet!\n");
793 if (!curr_cell.mv_ptr)
794 return AVERROR_INVALIDDATA;
796 mv_y = curr_cell.mv_ptr[0];
797 mv_x = curr_cell.mv_ptr[1];
798 if ( mv_x + 4*curr_cell.xpos < 0
799 || mv_y + 4*curr_cell.ypos < 0
800 || mv_x + 4*curr_cell.xpos + 4*curr_cell.width > plane->width
801 || mv_y + 4*curr_cell.ypos + 4*curr_cell.height > plane->height) {
802 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);
803 return AVERROR_INVALIDDATA;
806 copy_cell(ctx, plane, &curr_cell);
811 if (!curr_cell.tree) { /* MC tree INTER code */
813 /* get motion vector index and setup the pointer to the mv set */
814 if (!ctx->need_resync)
815 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
816 if (ctx->next_cell_data >= ctx->last_byte) {
817 av_log(avctx, AV_LOG_ERROR, "motion vector out of array\n");
818 return AVERROR_INVALIDDATA;
820 mv_idx = *(ctx->next_cell_data++);
821 if (mv_idx >= ctx->num_vectors) {
822 av_log(avctx, AV_LOG_ERROR, "motion vector index out of range\n");
823 return AVERROR_INVALIDDATA;
825 curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx << 1];
826 curr_cell.tree = 1; /* enter the VQ tree */
828 } else { /* VQ tree DATA code */
829 if (!ctx->need_resync)
830 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
833 bytes_used = decode_cell(ctx, avctx, plane, &curr_cell,
834 ctx->next_cell_data, ctx->last_byte);
836 return AVERROR_INVALIDDATA;
838 UPDATE_BITPOS(bytes_used << 3);
839 ctx->next_cell_data += bytes_used;
846 return AVERROR_INVALIDDATA;
850 static int decode_plane(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
851 Plane *plane, const uint8_t *data, int32_t data_size,
855 unsigned num_vectors;
857 /* each plane data starts with mc_vector_count field, */
858 /* an optional array of motion vectors followed by the vq data */
859 num_vectors = bytestream_get_le32(&data); data_size -= 4;
860 if (num_vectors > 256) {
861 av_log(ctx->avctx, AV_LOG_ERROR,
862 "Read invalid number of motion vectors %d\n", num_vectors);
863 return AVERROR_INVALIDDATA;
865 if (num_vectors * 2 > data_size)
866 return AVERROR_INVALIDDATA;
868 ctx->num_vectors = num_vectors;
869 ctx->mc_vectors = num_vectors ? data : 0;
871 /* init the bitreader */
872 init_get_bits(&ctx->gb, &data[num_vectors * 2], (data_size - num_vectors * 2) << 3);
874 ctx->need_resync = 0;
876 ctx->last_byte = data + data_size;
878 /* initialize the 1st cell and set its dimensions to whole plane */
879 curr_cell.xpos = curr_cell.ypos = 0;
880 curr_cell.width = plane->width >> 2;
881 curr_cell.height = plane->height >> 2;
882 curr_cell.tree = 0; // we are in the MC tree now
883 curr_cell.mv_ptr = 0; // no motion vector = INTRA cell
885 return parse_bintree(ctx, avctx, plane, INTRA_NULL, &curr_cell, CELL_STACK_MAX, strip_width);
889 #define OS_HDR_ID MKBETAG('F', 'R', 'M', 'H')
891 static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
892 const uint8_t *buf, int buf_size)
894 const uint8_t *buf_ptr = buf, *bs_hdr;
895 uint32_t frame_num, word2, check_sum, data_size;
896 uint32_t y_offset, u_offset, v_offset, starts[3], ends[3];
897 uint16_t height, width;
900 /* parse and check the OS header */
901 frame_num = bytestream_get_le32(&buf_ptr);
902 word2 = bytestream_get_le32(&buf_ptr);
903 check_sum = bytestream_get_le32(&buf_ptr);
904 data_size = bytestream_get_le32(&buf_ptr);
906 if ((frame_num ^ word2 ^ data_size ^ OS_HDR_ID) != check_sum) {
907 av_log(avctx, AV_LOG_ERROR, "OS header checksum mismatch!\n");
908 return AVERROR_INVALIDDATA;
911 /* parse the bitstream header */
915 if (bytestream_get_le16(&buf_ptr) != 32) {
916 av_log(avctx, AV_LOG_ERROR, "Unsupported codec version!\n");
917 return AVERROR_INVALIDDATA;
920 ctx->frame_num = frame_num;
921 ctx->frame_flags = bytestream_get_le16(&buf_ptr);
922 ctx->data_size = (bytestream_get_le32(&buf_ptr) + 7) >> 3;
923 ctx->cb_offset = *buf_ptr++;
925 if (ctx->data_size == 16)
927 if (ctx->data_size > buf_size)
928 ctx->data_size = buf_size;
930 buf_ptr += 3; // skip reserved byte and checksum
932 /* check frame dimensions */
933 height = bytestream_get_le16(&buf_ptr);
934 width = bytestream_get_le16(&buf_ptr);
935 if (av_image_check_size(width, height, 0, avctx))
936 return AVERROR_INVALIDDATA;
938 if (width != ctx->width || height != ctx->height) {
941 av_dlog(avctx, "Frame dimensions changed!\n");
943 if (width < 16 || width > 640 ||
944 height < 16 || height > 480 ||
945 width & 3 || height & 3) {
946 av_log(avctx, AV_LOG_ERROR,
947 "Invalid picture dimensions: %d x %d!\n", width, height);
948 return AVERROR_INVALIDDATA;
950 free_frame_buffers(ctx);
951 if ((res = allocate_frame_buffers(ctx, avctx, width, height)) < 0)
953 avcodec_set_dimensions(avctx, width, height);
956 y_offset = bytestream_get_le32(&buf_ptr);
957 v_offset = bytestream_get_le32(&buf_ptr);
958 u_offset = bytestream_get_le32(&buf_ptr);
960 /* unfortunately there is no common order of planes in the buffer */
961 /* so we use that sorting algo for determining planes data sizes */
962 starts[0] = y_offset;
963 starts[1] = v_offset;
964 starts[2] = u_offset;
966 for (j = 0; j < 3; j++) {
967 ends[j] = ctx->data_size;
968 for (i = 2; i >= 0; i--)
969 if (starts[i] < ends[j] && starts[i] > starts[j])
973 ctx->y_data_size = ends[0] - starts[0];
974 ctx->v_data_size = ends[1] - starts[1];
975 ctx->u_data_size = ends[2] - starts[2];
976 if (FFMAX3(y_offset, v_offset, u_offset) >= ctx->data_size - 16 ||
977 FFMIN3(ctx->y_data_size, ctx->v_data_size, ctx->u_data_size) <= 0) {
978 av_log(avctx, AV_LOG_ERROR, "One of the y/u/v offsets is invalid\n");
979 return AVERROR_INVALIDDATA;
982 ctx->y_data_ptr = bs_hdr + y_offset;
983 ctx->v_data_ptr = bs_hdr + v_offset;
984 ctx->u_data_ptr = bs_hdr + u_offset;
985 ctx->alt_quant = buf_ptr + sizeof(uint32_t);
987 if (ctx->data_size == 16) {
988 av_log(avctx, AV_LOG_DEBUG, "Sync frame encountered!\n");
992 if (ctx->frame_flags & BS_8BIT_PEL) {
993 av_log_ask_for_sample(avctx, "8-bit pixel format\n");
994 return AVERROR_PATCHWELCOME;
997 if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {
998 av_log_ask_for_sample(avctx, "halfpel motion vectors\n");
999 return AVERROR_PATCHWELCOME;
1007 * Convert and output the current plane.
1008 * All pixel values will be upsampled by shifting right by one bit.
1010 * @param[in] plane pointer to the descriptor of the plane being processed
1011 * @param[in] buf_sel indicates which frame buffer the input data stored in
1012 * @param[out] dst pointer to the buffer receiving converted pixels
1013 * @param[in] dst_pitch pitch for moving to the next y line
1014 * @param[in] dst_height output plane height
1016 static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst,
1017 int dst_pitch, int dst_height)
1020 const uint8_t *src = plane->pixels[buf_sel];
1021 uint32_t pitch = plane->pitch;
1023 dst_height = FFMIN(dst_height, plane->height);
1024 for (y = 0; y < dst_height; y++) {
1025 /* convert four pixels at once using SWAR */
1026 for (x = 0; x < plane->width >> 2; x++) {
1027 AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);
1032 for (x <<= 2; x < plane->width; x++)
1033 *dst++ = *src++ << 1;
1035 src += pitch - plane->width;
1036 dst += dst_pitch - plane->width;
1041 static av_cold int decode_init(AVCodecContext *avctx)
1043 Indeo3DecodeContext *ctx = avctx->priv_data;
1046 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
1047 avcodec_get_frame_defaults(&ctx->frame);
1049 build_requant_tab();
1051 ff_dsputil_init(&ctx->dsp, avctx);
1053 return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height);
1057 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1060 Indeo3DecodeContext *ctx = avctx->priv_data;
1061 const uint8_t *buf = avpkt->data;
1062 int buf_size = avpkt->size;
1065 res = decode_frame_headers(ctx, avctx, buf, buf_size);
1069 /* skip sync(null) frames */
1071 // we have processed 16 bytes but no data was decoded
1076 /* skip droppable INTER frames if requested */
1077 if (ctx->frame_flags & BS_NONREF &&
1078 (avctx->skip_frame >= AVDISCARD_NONREF))
1081 /* skip INTER frames if requested */
1082 if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)
1085 /* use BS_BUFFER flag for buffer switching */
1086 ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;
1088 if (ctx->frame.data[0])
1089 avctx->release_buffer(avctx, &ctx->frame);
1091 ctx->frame.reference = 0;
1092 if ((res = ff_get_buffer(avctx, &ctx->frame)) < 0) {
1093 av_log(ctx->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1097 /* decode luma plane */
1098 if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))
1101 /* decode chroma planes */
1102 if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))
1105 if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))
1108 output_plane(&ctx->planes[0], ctx->buf_sel,
1109 ctx->frame.data[0], ctx->frame.linesize[0],
1111 output_plane(&ctx->planes[1], ctx->buf_sel,
1112 ctx->frame.data[1], ctx->frame.linesize[1],
1113 (avctx->height + 3) >> 2);
1114 output_plane(&ctx->planes[2], ctx->buf_sel,
1115 ctx->frame.data[2], ctx->frame.linesize[2],
1116 (avctx->height + 3) >> 2);
1119 *(AVFrame*)data = ctx->frame;
1125 static av_cold int decode_close(AVCodecContext *avctx)
1127 Indeo3DecodeContext *ctx = avctx->priv_data;
1129 free_frame_buffers(avctx->priv_data);
1131 if (ctx->frame.data[0])
1132 avctx->release_buffer(avctx, &ctx->frame);
1137 AVCodec ff_indeo3_decoder = {
1139 .type = AVMEDIA_TYPE_VIDEO,
1140 .id = AV_CODEC_ID_INDEO3,
1141 .priv_data_size = sizeof(Indeo3DecodeContext),
1142 .init = decode_init,
1143 .close = decode_close,
1144 .decode = decode_frame,
1145 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),
1146 .capabilities = CODEC_CAP_DR1,