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"
35 #include "copy_block.h"
36 #include "bytestream.h"
41 #include "indeo3data.h"
45 RLE_ESC_F9 = 249, ///< same as RLE_ESC_FA + do the same with next block
46 RLE_ESC_FA = 250, ///< INTRA: skip block, INTER: copy data from reference
47 RLE_ESC_FB = 251, ///< apply null delta to N blocks / skip N blocks
48 RLE_ESC_FC = 252, ///< same as RLE_ESC_FD + do the same with next block
49 RLE_ESC_FD = 253, ///< apply null delta to all remaining lines of this block
50 RLE_ESC_FE = 254, ///< apply null delta to all lines up to the 3rd line
51 RLE_ESC_FF = 255 ///< apply null delta to all lines up to the 2nd line
55 /* Some constants for parsing frame bitstream flags. */
56 #define BS_8BIT_PEL (1 << 1) ///< 8bit pixel bitdepth indicator
57 #define BS_KEYFRAME (1 << 2) ///< intra frame indicator
58 #define BS_MV_Y_HALF (1 << 4) ///< vertical mv halfpel resolution indicator
59 #define BS_MV_X_HALF (1 << 5) ///< horizontal mv halfpel resolution indicator
60 #define BS_NONREF (1 << 8) ///< nonref (discardable) frame indicator
61 #define BS_BUFFER 9 ///< indicates which of two frame buffers should be used
64 typedef struct Plane {
66 uint8_t *pixels[2]; ///< pointer to the actual pixel data of the buffers above
72 #define CELL_STACK_MAX 20
75 int16_t xpos; ///< cell coordinates in 4x4 blocks
77 int16_t width; ///< cell width in 4x4 blocks
78 int16_t height; ///< cell height in 4x4 blocks
79 uint8_t tree; ///< tree id: 0- MC tree, 1 - VQ tree
80 const int8_t *mv_ptr; ///< ptr to the motion vector if any
83 typedef struct Indeo3DecodeContext {
84 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 int 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];
243 /* -1 because there is an extra line on top for prediction */
244 if ((cell->ypos << 2) + mv_y < -1 || (cell->xpos << 2) + mv_x < 0 ||
245 ((cell->ypos + cell->height) << 2) + mv_y > plane->height ||
246 ((cell->xpos + cell->width) << 2) + mv_x > plane->width) {
247 av_log(ctx->avctx, AV_LOG_ERROR,
248 "Motion vectors point out of the frame.\n");
249 return AVERROR_INVALIDDATA;
252 offset = offset_dst + mv_y * plane->pitch + mv_x;
253 src = plane->pixels[ctx->buf_sel ^ 1] + offset;
255 h = cell->height << 2;
257 for (w = cell->width; w > 0;) {
258 /* copy using 16xH blocks */
259 if (!((cell->xpos << 2) & 15) && w >= 4) {
260 for (; w >= 4; src += 16, dst += 16, w -= 4)
261 ctx->hdsp.put_pixels_tab[0][0](dst, src, plane->pitch, h);
264 /* copy using 8xH blocks */
265 if (!((cell->xpos << 2) & 7) && w >= 2) {
266 ctx->hdsp.put_pixels_tab[1][0](dst, src, plane->pitch, h);
271 ctx->hdsp.put_pixels_tab[2][0](dst, src, plane->pitch, h);
282 /* Average 4/8 pixels at once without rounding using SWAR */
283 #define AVG_32(dst, src, ref) \
284 AV_WN32A(dst, ((AV_RN32(src) + AV_RN32(ref)) >> 1) & 0x7F7F7F7FUL)
286 #define AVG_64(dst, src, ref) \
287 AV_WN64A(dst, ((AV_RN64(src) + AV_RN64(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)
291 * Replicate each even pixel as follows:
292 * ABCDEFGH -> AACCEEGG
294 static inline uint64_t replicate64(uint64_t a) {
296 a &= 0xFF00FF00FF00FF00ULL;
299 a &= 0x00FF00FF00FF00FFULL;
305 static inline uint32_t replicate32(uint32_t a) {
317 /* Fill n lines with 64bit pixel value pix */
318 static inline void fill_64(uint8_t *dst, const uint64_t pix, int32_t n,
321 for (; n > 0; dst += row_offset, n--)
326 /* Error codes for cell decoding. */
337 #define BUFFER_PRECHECK \
338 if (*data_ptr >= last_ptr) \
339 return IV3_OUT_OF_DATA; \
341 #define RLE_BLOCK_COPY \
342 if (cell->mv_ptr || !skip_flag) \
343 copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom)
345 #define RLE_BLOCK_COPY_8 \
346 pix64 = AV_RN64(ref);\
347 if (is_first_row) {/* special prediction case: top line of a cell */\
348 pix64 = replicate64(pix64);\
349 fill_64(dst + row_offset, pix64, 7, row_offset);\
350 AVG_64(dst, ref, dst + row_offset);\
352 fill_64(dst, pix64, 8, row_offset)
354 #define RLE_LINES_COPY \
355 copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom)
357 #define RLE_LINES_COPY_M10 \
358 pix64 = AV_RN64(ref);\
359 if (is_top_of_cell) {\
360 pix64 = replicate64(pix64);\
361 fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\
362 AVG_64(dst, ref, dst + row_offset);\
364 fill_64(dst, pix64, num_lines << 1, row_offset)
366 #define APPLY_DELTA_4 \
367 AV_WN16A(dst + line_offset ,\
368 (AV_RN16(ref ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
369 AV_WN16A(dst + line_offset + 2,\
370 (AV_RN16(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
372 if (is_top_of_cell && !cell->ypos) {\
373 AV_COPY32U(dst, dst + row_offset);\
375 AVG_32(dst, ref, dst + row_offset);\
379 #define APPLY_DELTA_8 \
380 /* apply two 32-bit VQ deltas to next even line */\
381 if (is_top_of_cell) { \
382 AV_WN32A(dst + row_offset , \
383 (replicate32(AV_RN32(ref )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
384 AV_WN32A(dst + row_offset + 4, \
385 (replicate32(AV_RN32(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
387 AV_WN32A(dst + row_offset , \
388 (AV_RN32(ref ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
389 AV_WN32A(dst + row_offset + 4, \
390 (AV_RN32(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
392 /* odd lines are not coded but rather interpolated/replicated */\
393 /* first line of the cell on the top of image? - replicate */\
394 /* otherwise - interpolate */\
395 if (is_top_of_cell && !cell->ypos) {\
396 AV_COPY64U(dst, dst + row_offset);\
398 AVG_64(dst, ref, dst + row_offset);
401 #define APPLY_DELTA_1011_INTER \
404 (AV_RN32(dst ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
406 (AV_RN32(dst + 4 ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
407 AV_WN32A(dst + row_offset , \
408 (AV_RN32(dst + row_offset ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
409 AV_WN32A(dst + row_offset + 4, \
410 (AV_RN32(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
413 (AV_RN16(dst ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
415 (AV_RN16(dst + 2 ) + delta_tab->deltas[dyad2]) & 0x7F7F);\
416 AV_WN16A(dst + row_offset , \
417 (AV_RN16(dst + row_offset ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
418 AV_WN16A(dst + row_offset + 2, \
419 (AV_RN16(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
423 static int decode_cell_data(Indeo3DecodeContext *ctx, Cell *cell,
424 uint8_t *block, uint8_t *ref_block,
425 int pitch, int h_zoom, int v_zoom, int mode,
426 const vqEntry *delta[2], int swap_quads[2],
427 const uint8_t **data_ptr, const uint8_t *last_ptr)
429 int x, y, line, num_lines;
431 uint8_t code, *dst, *ref;
432 const vqEntry *delta_tab;
433 unsigned int dyad1, dyad2;
435 int skip_flag = 0, is_top_of_cell, is_first_row = 1;
436 int row_offset, blk_row_offset, line_offset;
439 blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2);
440 line_offset = v_zoom ? row_offset : 0;
442 if (cell->height & v_zoom || cell->width & h_zoom)
445 for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) {
446 for (x = 0; x < cell->width; x += 1 + h_zoom) {
450 if (rle_blocks > 0) {
453 } else if (mode == 10 && !cell->mv_ptr) {
458 for (line = 0; line < 4;) {
460 is_top_of_cell = is_first_row && !line;
462 /* select primary VQ table for odd, secondary for even lines */
464 delta_tab = delta[line & 1];
466 delta_tab = delta[1];
468 code = bytestream_get_byte(data_ptr);
470 if (code < delta_tab->num_dyads) {
472 dyad1 = bytestream_get_byte(data_ptr);
474 if (dyad1 >= delta_tab->num_dyads || dyad1 >= 248)
478 code -= delta_tab->num_dyads;
479 dyad1 = code / delta_tab->quad_exp;
480 dyad2 = code % delta_tab->quad_exp;
481 if (swap_quads[line & 1])
482 FFSWAP(unsigned int, dyad1, dyad2);
486 } else if (mode == 10 && !cell->mv_ptr) {
489 APPLY_DELTA_1011_INTER;
492 /* process RLE codes */
502 num_lines = 257 - code - line;
507 } else if (mode == 10 && !cell->mv_ptr) {
513 code = bytestream_get_byte(data_ptr);
514 rle_blocks = (code & 0x1F) - 1; /* set block counter */
515 if (code >= 64 || rle_blocks < 0)
516 return IV3_BAD_COUNTER;
517 skip_flag = code & 0x20;
518 num_lines = 4 - line; /* enforce next block processing */
519 if (mode >= 10 || (cell->mv_ptr || !skip_flag)) {
522 } else if (mode == 10 && !cell->mv_ptr) {
534 num_lines = 4; /* enforce next block processing */
538 } else if (mode == 10 && !cell->mv_ptr) {
544 return IV3_UNSUPPORTED;
549 ref += row_offset * (num_lines << v_zoom);
550 dst += row_offset * (num_lines << v_zoom);
554 /* move to next horizontal block */
555 block += 4 << h_zoom;
556 ref_block += 4 << h_zoom;
559 /* move to next line of blocks */
560 ref_block += blk_row_offset;
561 block += blk_row_offset;
568 * Decode a vector-quantized cell.
569 * It consists of several routines, each of which handles one or more "modes"
570 * with which a cell can be encoded.
572 * @param ctx pointer to the decoder context
573 * @param avctx ptr to the AVCodecContext
574 * @param plane pointer to the plane descriptor
575 * @param cell pointer to the cell descriptor
576 * @param data_ptr pointer to the compressed data
577 * @param last_ptr pointer to the last byte to catch reads past end of buffer
578 * @return number of consumed bytes or negative number in case of error
580 static int decode_cell(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
581 Plane *plane, Cell *cell, const uint8_t *data_ptr,
582 const uint8_t *last_ptr)
584 int x, mv_x, mv_y, mode, vq_index, prim_indx, second_indx;
586 int offset, error = 0, swap_quads[2];
587 uint8_t code, *block, *ref_block = 0;
588 const vqEntry *delta[2];
589 const uint8_t *data_start = data_ptr;
591 /* get coding mode and VQ table index from the VQ descriptor byte */
594 vq_index = code & 0xF;
596 /* setup output and reference pointers */
597 offset = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
598 block = plane->pixels[ctx->buf_sel] + offset;
601 /* use previous line as reference for INTRA cells */
602 ref_block = block - plane->pitch;
603 } else if (mode >= 10) {
604 /* for mode 10 and 11 INTER first copy the predicted cell into the current one */
605 /* so we don't need to do data copying for each RLE code later */
606 int ret = copy_cell(ctx, plane, cell);
610 /* set the pointer to the reference pixels for modes 0-4 INTER */
611 mv_y = cell->mv_ptr[0];
612 mv_x = cell->mv_ptr[1];
614 /* -1 because there is an extra line on top for prediction */
615 if ((cell->ypos << 2) + mv_y < -1 || (cell->xpos << 2) + mv_x < 0 ||
616 ((cell->ypos + cell->height) << 2) + mv_y > plane->height ||
617 ((cell->xpos + cell->width) << 2) + mv_x > plane->width) {
618 av_log(ctx->avctx, AV_LOG_ERROR,
619 "Motion vectors point out of the frame.\n");
620 return AVERROR_INVALIDDATA;
623 offset += mv_y * plane->pitch + mv_x;
624 ref_block = plane->pixels[ctx->buf_sel ^ 1] + offset;
627 /* select VQ tables as follows: */
628 /* modes 0 and 3 use only the primary table for all lines in a block */
629 /* while modes 1 and 4 switch between primary and secondary tables on alternate lines */
630 if (mode == 1 || mode == 4) {
631 code = ctx->alt_quant[vq_index];
632 prim_indx = (code >> 4) + ctx->cb_offset;
633 second_indx = (code & 0xF) + ctx->cb_offset;
635 vq_index += ctx->cb_offset;
636 prim_indx = second_indx = vq_index;
639 if (prim_indx >= 24 || second_indx >= 24) {
640 av_log(avctx, AV_LOG_ERROR, "Invalid VQ table indexes! Primary: %d, secondary: %d!\n",
641 prim_indx, second_indx);
642 return AVERROR_INVALIDDATA;
645 delta[0] = &vq_tab[second_indx];
646 delta[1] = &vq_tab[prim_indx];
647 swap_quads[0] = second_indx >= 16;
648 swap_quads[1] = prim_indx >= 16;
650 /* requantize the prediction if VQ index of this cell differs from VQ index */
651 /* of the predicted cell in order to avoid overflows. */
652 if (vq_index >= 8 && ref_block) {
653 for (x = 0; x < cell->width << 2; x++)
654 ref_block[x] = requant_tab[vq_index & 7][ref_block[x] & 127];
660 case 0: /*------------------ MODES 0 & 1 (4x4 block processing) --------------------*/
662 case 3: /*------------------ MODES 3 & 4 (4x8 block processing) --------------------*/
664 if (mode >= 3 && cell->mv_ptr) {
665 av_log(avctx, AV_LOG_ERROR, "Attempt to apply Mode 3/4 to an INTER cell!\n");
666 return AVERROR_INVALIDDATA;
669 zoom_fac = mode >= 3;
670 error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch,
671 0, zoom_fac, mode, delta, swap_quads,
672 &data_ptr, last_ptr);
674 case 10: /*-------------------- MODE 10 (8x8 block processing) ---------------------*/
675 case 11: /*----------------- MODE 11 (4x8 INTER block processing) ------------------*/
676 if (mode == 10 && !cell->mv_ptr) { /* MODE 10 INTRA processing */
677 error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch,
678 1, 1, mode, delta, swap_quads,
679 &data_ptr, last_ptr);
680 } else { /* mode 10 and 11 INTER processing */
681 if (mode == 11 && !cell->mv_ptr) {
682 av_log(avctx, AV_LOG_ERROR, "Attempt to use Mode 11 for an INTRA cell!\n");
683 return AVERROR_INVALIDDATA;
686 zoom_fac = mode == 10;
687 error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch,
688 zoom_fac, 1, mode, delta, swap_quads,
689 &data_ptr, last_ptr);
693 av_log(avctx, AV_LOG_ERROR, "Unsupported coding mode: %d\n", mode);
694 return AVERROR_INVALIDDATA;
699 av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE code %X is not allowed at the current line\n",
701 return AVERROR_INVALIDDATA;
703 av_log(avctx, AV_LOG_ERROR, "Mode %d: invalid VQ data\n", mode);
704 return AVERROR_INVALIDDATA;
705 case IV3_BAD_COUNTER:
706 av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE-FB invalid counter: %d\n", mode, code);
707 return AVERROR_INVALIDDATA;
708 case IV3_UNSUPPORTED:
709 av_log(avctx, AV_LOG_ERROR, "Mode %d: unsupported RLE code: %X\n", mode, data_ptr[-1]);
710 return AVERROR_INVALIDDATA;
711 case IV3_OUT_OF_DATA:
712 av_log(avctx, AV_LOG_ERROR, "Mode %d: attempt to read past end of buffer\n", mode);
713 return AVERROR_INVALIDDATA;
716 return data_ptr - data_start; /* report number of bytes consumed from the input buffer */
720 /* Binary tree codes. */
729 #define SPLIT_CELL(size, new_size) (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1
731 #define UPDATE_BITPOS(n) \
732 ctx->skip_bits += (n); \
735 #define RESYNC_BITSTREAM \
736 if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \
737 skip_bits_long(&ctx->gb, ctx->skip_bits); \
738 ctx->skip_bits = 0; \
739 ctx->need_resync = 0; \
743 if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) || \
744 curr_cell.ypos + curr_cell.height > (plane->height >> 2)) { \
745 av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n", \
746 curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \
747 return AVERROR_INVALIDDATA; \
751 static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
752 Plane *plane, int code, Cell *ref_cell,
753 const int depth, const int strip_width)
759 av_log(avctx, AV_LOG_ERROR, "Stack overflow (corrupted binary tree)!\n");
760 return AVERROR_INVALIDDATA; // unwind recursion
763 curr_cell = *ref_cell; // clone parent cell
764 if (code == H_SPLIT) {
765 SPLIT_CELL(ref_cell->height, curr_cell.height);
766 ref_cell->ypos += curr_cell.height;
767 ref_cell->height -= curr_cell.height;
768 if (ref_cell->height <= 0 || curr_cell.height <= 0)
769 return AVERROR_INVALIDDATA;
770 } else if (code == V_SPLIT) {
771 if (curr_cell.width > strip_width) {
773 curr_cell.width = (curr_cell.width <= (strip_width << 1) ? 1 : 2) * strip_width;
775 SPLIT_CELL(ref_cell->width, curr_cell.width);
776 ref_cell->xpos += curr_cell.width;
777 ref_cell->width -= curr_cell.width;
778 if (ref_cell->width <= 0 || curr_cell.width <= 0)
779 return AVERROR_INVALIDDATA;
782 while (get_bits_left(&ctx->gb) >= 2) { /* loop until return */
784 switch (code = get_bits(&ctx->gb, 2)) {
787 if (parse_bintree(ctx, avctx, plane, code, &curr_cell, depth - 1, strip_width))
788 return AVERROR_INVALIDDATA;
791 if (!curr_cell.tree) { /* MC tree INTRA code */
792 curr_cell.mv_ptr = 0; /* mark the current strip as INTRA */
793 curr_cell.tree = 1; /* enter the VQ tree */
794 } else { /* VQ tree NULL code */
796 code = get_bits(&ctx->gb, 2);
798 av_log(avctx, AV_LOG_ERROR, "Invalid VQ_NULL code: %d\n", code);
799 return AVERROR_INVALIDDATA;
802 av_log(avctx, AV_LOG_ERROR, "SkipCell procedure not implemented yet!\n");
805 if (!curr_cell.mv_ptr)
806 return AVERROR_INVALIDDATA;
808 ret = copy_cell(ctx, plane, &curr_cell);
813 if (!curr_cell.tree) { /* MC tree INTER code */
815 /* get motion vector index and setup the pointer to the mv set */
816 if (!ctx->need_resync)
817 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
818 if (ctx->next_cell_data >= ctx->last_byte) {
819 av_log(avctx, AV_LOG_ERROR, "motion vector out of array\n");
820 return AVERROR_INVALIDDATA;
822 mv_idx = *(ctx->next_cell_data++);
823 if (mv_idx >= ctx->num_vectors) {
824 av_log(avctx, AV_LOG_ERROR, "motion vector index out of range\n");
825 return AVERROR_INVALIDDATA;
827 curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx << 1];
828 curr_cell.tree = 1; /* enter the VQ tree */
830 } else { /* VQ tree DATA code */
831 if (!ctx->need_resync)
832 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
835 bytes_used = decode_cell(ctx, avctx, plane, &curr_cell,
836 ctx->next_cell_data, ctx->last_byte);
838 return AVERROR_INVALIDDATA;
840 UPDATE_BITPOS(bytes_used << 3);
841 ctx->next_cell_data += bytes_used;
848 return AVERROR_INVALIDDATA;
852 static int decode_plane(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
853 Plane *plane, const uint8_t *data, int32_t data_size,
857 unsigned num_vectors;
859 /* each plane data starts with mc_vector_count field, */
860 /* an optional array of motion vectors followed by the vq data */
861 num_vectors = bytestream_get_le32(&data); data_size -= 4;
862 if (num_vectors > 256) {
863 av_log(ctx->avctx, AV_LOG_ERROR,
864 "Read invalid number of motion vectors %d\n", num_vectors);
865 return AVERROR_INVALIDDATA;
867 if (num_vectors * 2 > data_size)
868 return AVERROR_INVALIDDATA;
870 ctx->num_vectors = num_vectors;
871 ctx->mc_vectors = num_vectors ? data : 0;
873 /* init the bitreader */
874 init_get_bits(&ctx->gb, &data[num_vectors * 2], (data_size - num_vectors * 2) << 3);
876 ctx->need_resync = 0;
878 ctx->last_byte = data + data_size;
880 /* initialize the 1st cell and set its dimensions to whole plane */
881 curr_cell.xpos = curr_cell.ypos = 0;
882 curr_cell.width = plane->width >> 2;
883 curr_cell.height = plane->height >> 2;
884 curr_cell.tree = 0; // we are in the MC tree now
885 curr_cell.mv_ptr = 0; // no motion vector = INTRA cell
887 return parse_bintree(ctx, avctx, plane, INTRA_NULL, &curr_cell, CELL_STACK_MAX, strip_width);
891 #define OS_HDR_ID MKBETAG('F', 'R', 'M', 'H')
893 static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
894 const uint8_t *buf, int buf_size)
897 const uint8_t *bs_hdr;
898 uint32_t frame_num, word2, check_sum, data_size;
899 uint32_t y_offset, u_offset, v_offset, starts[3], ends[3];
900 uint16_t height, width;
903 bytestream2_init(&gb, buf, buf_size);
905 /* parse and check the OS header */
906 frame_num = bytestream2_get_le32(&gb);
907 word2 = bytestream2_get_le32(&gb);
908 check_sum = bytestream2_get_le32(&gb);
909 data_size = bytestream2_get_le32(&gb);
911 if ((frame_num ^ word2 ^ data_size ^ OS_HDR_ID) != check_sum) {
912 av_log(avctx, AV_LOG_ERROR, "OS header checksum mismatch!\n");
913 return AVERROR_INVALIDDATA;
916 /* parse the bitstream header */
919 if (bytestream2_get_le16(&gb) != 32) {
920 av_log(avctx, AV_LOG_ERROR, "Unsupported codec version!\n");
921 return AVERROR_INVALIDDATA;
924 ctx->frame_num = frame_num;
925 ctx->frame_flags = bytestream2_get_le16(&gb);
926 ctx->data_size = (bytestream2_get_le32(&gb) + 7) >> 3;
927 ctx->cb_offset = bytestream2_get_byte(&gb);
929 if (ctx->data_size == 16)
931 ctx->data_size = FFMIN(ctx->data_size, buf_size - 16);
933 bytestream2_skip(&gb, 3); // skip reserved byte and checksum
935 /* check frame dimensions */
936 height = bytestream2_get_le16(&gb);
937 width = bytestream2_get_le16(&gb);
938 if (av_image_check_size(width, height, 0, avctx))
939 return AVERROR_INVALIDDATA;
941 if (width != ctx->width || height != ctx->height) {
944 av_dlog(avctx, "Frame dimensions changed!\n");
946 if (width < 16 || width > 640 ||
947 height < 16 || height > 480 ||
948 width & 3 || height & 3) {
949 av_log(avctx, AV_LOG_ERROR,
950 "Invalid picture dimensions: %d x %d!\n", width, height);
951 return AVERROR_INVALIDDATA;
953 free_frame_buffers(ctx);
954 if ((res = allocate_frame_buffers(ctx, avctx, width, height)) < 0)
956 avcodec_set_dimensions(avctx, width, height);
959 y_offset = bytestream2_get_le32(&gb);
960 v_offset = bytestream2_get_le32(&gb);
961 u_offset = bytestream2_get_le32(&gb);
962 bytestream2_skip(&gb, 4);
964 /* unfortunately there is no common order of planes in the buffer */
965 /* so we use that sorting algo for determining planes data sizes */
966 starts[0] = y_offset;
967 starts[1] = v_offset;
968 starts[2] = u_offset;
970 for (j = 0; j < 3; j++) {
971 ends[j] = ctx->data_size;
972 for (i = 2; i >= 0; i--)
973 if (starts[i] < ends[j] && starts[i] > starts[j])
977 ctx->y_data_size = ends[0] - starts[0];
978 ctx->v_data_size = ends[1] - starts[1];
979 ctx->u_data_size = ends[2] - starts[2];
980 if (FFMAX3(y_offset, v_offset, u_offset) >= ctx->data_size - 16 ||
981 FFMIN3(y_offset, v_offset, u_offset) < gb.buffer - bs_hdr + 16 ||
982 FFMIN3(ctx->y_data_size, ctx->v_data_size, ctx->u_data_size) <= 0) {
983 av_log(avctx, AV_LOG_ERROR, "One of the y/u/v offsets is invalid\n");
984 return AVERROR_INVALIDDATA;
987 ctx->y_data_ptr = bs_hdr + y_offset;
988 ctx->v_data_ptr = bs_hdr + v_offset;
989 ctx->u_data_ptr = bs_hdr + u_offset;
990 ctx->alt_quant = gb.buffer;
992 if (ctx->data_size == 16) {
993 av_log(avctx, AV_LOG_DEBUG, "Sync frame encountered!\n");
997 if (ctx->frame_flags & BS_8BIT_PEL) {
998 avpriv_request_sample(avctx, "8-bit pixel format");
999 return AVERROR_PATCHWELCOME;
1002 if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {
1003 avpriv_request_sample(avctx, "Halfpel motion vectors");
1004 return AVERROR_PATCHWELCOME;
1012 * Convert and output the current plane.
1013 * All pixel values will be upsampled by shifting right by one bit.
1015 * @param[in] plane pointer to the descriptor of the plane being processed
1016 * @param[in] buf_sel indicates which frame buffer the input data stored in
1017 * @param[out] dst pointer to the buffer receiving converted pixels
1018 * @param[in] dst_pitch pitch for moving to the next y line
1019 * @param[in] dst_height output plane height
1021 static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst,
1022 int dst_pitch, int dst_height)
1025 const uint8_t *src = plane->pixels[buf_sel];
1026 uint32_t pitch = plane->pitch;
1028 dst_height = FFMIN(dst_height, plane->height);
1029 for (y = 0; y < dst_height; y++) {
1030 /* convert four pixels at once using SWAR */
1031 for (x = 0; x < plane->width >> 2; x++) {
1032 AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);
1037 for (x <<= 2; x < plane->width; x++)
1038 *dst++ = *src++ << 1;
1040 src += pitch - plane->width;
1041 dst += dst_pitch - plane->width;
1046 static av_cold int decode_init(AVCodecContext *avctx)
1048 Indeo3DecodeContext *ctx = avctx->priv_data;
1051 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
1053 build_requant_tab();
1055 ff_hpeldsp_init(&ctx->hdsp, avctx->flags);
1057 return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height);
1061 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1064 Indeo3DecodeContext *ctx = avctx->priv_data;
1065 const uint8_t *buf = avpkt->data;
1066 int buf_size = avpkt->size;
1067 AVFrame *frame = data;
1070 res = decode_frame_headers(ctx, avctx, buf, buf_size);
1074 /* skip sync(null) frames */
1076 // we have processed 16 bytes but no data was decoded
1081 /* skip droppable INTER frames if requested */
1082 if (ctx->frame_flags & BS_NONREF &&
1083 (avctx->skip_frame >= AVDISCARD_NONREF))
1086 /* skip INTER frames if requested */
1087 if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)
1090 /* use BS_BUFFER flag for buffer switching */
1091 ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;
1093 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
1096 /* decode luma plane */
1097 if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))
1100 /* decode chroma planes */
1101 if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))
1104 if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))
1107 output_plane(&ctx->planes[0], ctx->buf_sel,
1108 frame->data[0], frame->linesize[0],
1110 output_plane(&ctx->planes[1], ctx->buf_sel,
1111 frame->data[1], frame->linesize[1],
1112 (avctx->height + 3) >> 2);
1113 output_plane(&ctx->planes[2], ctx->buf_sel,
1114 frame->data[2], frame->linesize[2],
1115 (avctx->height + 3) >> 2);
1123 static av_cold int decode_close(AVCodecContext *avctx)
1125 free_frame_buffers(avctx->priv_data);
1130 AVCodec ff_indeo3_decoder = {
1132 .type = AVMEDIA_TYPE_VIDEO,
1133 .id = AV_CODEC_ID_INDEO3,
1134 .priv_data_size = sizeof(Indeo3DecodeContext),
1135 .init = decode_init,
1136 .close = decode_close,
1137 .decode = decode_frame,
1138 .capabilities = CODEC_CAP_DR1,
1139 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),