2 * Copyright (c) 2002 The FFmpeg Project
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "mpegutils.h"
27 #include "mpegvideo.h"
29 #include "msmpeg4data.h"
33 static int parse_mb_skip(Wmv2Context *w)
36 int coded_mb_count = 0;
37 MpegEncContext *const s = &w->s;
38 uint32_t *const mb_type = s->current_picture_ptr->mb_type;
40 w->skip_type = get_bits(&s->gb, 2);
41 switch (w->skip_type) {
43 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
44 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
45 mb_type[mb_y * s->mb_stride + mb_x] =
46 MB_TYPE_16x16 | MB_TYPE_L0;
49 if (get_bits_left(&s->gb) < s->mb_height * s->mb_width)
50 return AVERROR_INVALIDDATA;
51 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
52 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
53 mb_type[mb_y * s->mb_stride + mb_x] =
54 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
57 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
58 if (get_bits_left(&s->gb) < 1)
59 return AVERROR_INVALIDDATA;
60 if (get_bits1(&s->gb)) {
61 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
62 mb_type[mb_y * s->mb_stride + mb_x] =
63 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
65 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
66 mb_type[mb_y * s->mb_stride + mb_x] =
67 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
72 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
73 if (get_bits_left(&s->gb) < 1)
74 return AVERROR_INVALIDDATA;
75 if (get_bits1(&s->gb)) {
76 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
77 mb_type[mb_y * s->mb_stride + mb_x] =
78 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
80 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
81 mb_type[mb_y * s->mb_stride + mb_x] =
82 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
88 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
89 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
90 coded_mb_count += !IS_SKIP(mb_type[mb_y * s->mb_stride + mb_x]);
92 if (coded_mb_count > get_bits_left(&s->gb))
93 return AVERROR_INVALIDDATA;
98 static int decode_ext_header(Wmv2Context *w)
100 MpegEncContext *const s = &w->s;
105 if (s->avctx->extradata_size < 4)
106 return AVERROR_INVALIDDATA;
108 init_get_bits(&gb, s->avctx->extradata, 32);
110 fps = get_bits(&gb, 5);
111 s->bit_rate = get_bits(&gb, 11) * 1024;
112 w->mspel_bit = get_bits1(&gb);
113 s->loop_filter = get_bits1(&gb);
114 w->abt_flag = get_bits1(&gb);
115 w->j_type_bit = get_bits1(&gb);
116 w->top_left_mv_flag = get_bits1(&gb);
117 w->per_mb_rl_bit = get_bits1(&gb);
118 code = get_bits(&gb, 3);
121 return AVERROR_INVALIDDATA;
123 s->slice_height = s->mb_height / code;
125 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
126 av_log(s->avctx, AV_LOG_DEBUG,
127 "fps:%d, br:%"PRId64", qpbit:%d, abt_flag:%d, j_type_bit:%d, "
128 "tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, "
130 fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit,
131 w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
136 int ff_wmv2_decode_picture_header(MpegEncContext *s)
138 Wmv2Context *const w = (Wmv2Context *) s;
141 if (s->picture_number == 0)
142 decode_ext_header(w);
144 s->pict_type = get_bits1(&s->gb) + 1;
145 if (s->pict_type == AV_PICTURE_TYPE_I) {
146 code = get_bits(&s->gb, 7);
147 av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
149 s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
151 return AVERROR_INVALIDDATA;
153 if (s->pict_type != AV_PICTURE_TYPE_I && show_bits(&s->gb, 1)) {
154 GetBitContext gb = s->gb;
155 int skip_type = get_bits(&gb, 2);
156 int run = skip_type == SKIP_TYPE_COL ? s->mb_width : s->mb_height;
159 int block = FFMIN(run, 25);
160 if (get_bits(&gb, block) + 1 != 1<<block)
165 return FRAME_SKIPPED;
171 int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
173 Wmv2Context *const w = (Wmv2Context *) s;
175 if (s->pict_type == AV_PICTURE_TYPE_I) {
177 w->j_type = get_bits1(&s->gb);
179 w->j_type = 0; // FIXME check
182 if (w->per_mb_rl_bit)
183 s->per_mb_rl_table = get_bits1(&s->gb);
185 s->per_mb_rl_table = 0;
187 if (!s->per_mb_rl_table) {
188 s->rl_chroma_table_index = decode012(&s->gb);
189 s->rl_table_index = decode012(&s->gb);
192 s->dc_table_index = get_bits1(&s->gb);
194 // at minimum one bit per macroblock is required at least in a valid frame,
195 // we discard frames much smaller than this. Frames smaller than 1/8 of the
196 // smallest "black/skip" frame generally contain not much recoverable content
197 // while at the same time they have the highest computational requirements
199 if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
200 return AVERROR_INVALIDDATA;
202 s->inter_intra_pred = 0;
204 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
205 av_log(s->avctx, AV_LOG_DEBUG,
206 "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
207 s->qscale, s->rl_chroma_table_index, s->rl_table_index,
208 s->dc_table_index, s->per_mb_rl_table, w->j_type);
215 ret = parse_mb_skip(w);
218 cbp_index = decode012(&s->gb);
219 w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
222 s->mspel = get_bits1(&s->gb);
224 s->mspel = 0; // FIXME check
227 w->per_mb_abt = get_bits1(&s->gb) ^ 1;
229 w->abt_type = decode012(&s->gb);
232 if (w->per_mb_rl_bit)
233 s->per_mb_rl_table = get_bits1(&s->gb);
235 s->per_mb_rl_table = 0;
237 if (!s->per_mb_rl_table) {
238 s->rl_table_index = decode012(&s->gb);
239 s->rl_chroma_table_index = s->rl_table_index;
242 if (get_bits_left(&s->gb) < 2)
243 return AVERROR_INVALIDDATA;
245 s->dc_table_index = get_bits1(&s->gb);
246 s->mv_table_index = get_bits1(&s->gb);
248 s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
251 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
252 av_log(s->avctx, AV_LOG_DEBUG,
253 "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d "
254 "per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
255 s->rl_table_index, s->rl_chroma_table_index,
256 s->dc_table_index, s->mv_table_index,
257 s->per_mb_rl_table, s->qscale, s->mspel,
258 w->per_mb_abt, w->abt_type, w->cbp_table_index,
259 s->inter_intra_pred);
262 s->esc3_level_length = 0;
263 s->esc3_run_length = 0;
264 s->picture_number++; // FIXME ?
267 ff_intrax8_decode_picture(&w->x8, &s->current_picture,
268 &s->gb, &s->mb_x, &s->mb_y,
269 2 * s->qscale, (s->qscale - 1) | 1,
270 s->loop_filter, s->low_delay);
272 ff_er_add_slice(&w->s.er, 0, 0,
273 (w->s.mb_x >> 1) - 1, (w->s.mb_y >> 1) - 1,
281 static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
283 MpegEncContext *const s = &w->s;
286 ret = ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
291 if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel)
292 w->hshift = get_bits1(&s->gb);
299 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py)
301 MpegEncContext *const s = &w->s;
302 int xy, wrap, diff, type;
303 int16_t *A, *B, *C, *mot_val;
306 xy = s->block_index[0];
308 mot_val = s->current_picture.motion_val[0][xy];
310 A = s->current_picture.motion_val[0][xy - 1];
311 B = s->current_picture.motion_val[0][xy - wrap];
312 C = s->current_picture.motion_val[0][xy + 2 - wrap];
314 if (s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
315 diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
320 type = get_bits1(&s->gb);
327 } else if (type == 1) {
331 /* special case for first (slice) line */
332 if (s->first_slice_line) {
336 *px = mid_pred(A[0], B[0], C[0]);
337 *py = mid_pred(A[1], B[1], C[1]);
344 static inline int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block,
347 MpegEncContext *const s = &w->s;
348 static const int sub_cbp_table[3] = { 2, 3, 1 };
352 s->block_last_index[n] = -1;
356 if (w->per_block_abt)
357 w->abt_type = decode012(&s->gb);
358 w->abt_type_table[n] = w->abt_type;
361 // const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].permutated;
362 const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].scantable;
363 // const uint8_t *scantable = w->abt_type - 1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
365 sub_cbp = sub_cbp_table[decode012(&s->gb)];
368 if ((ret = ff_msmpeg4_decode_block(s, block, n, 1, scantable)) < 0)
372 if ((ret = ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable)) < 0)
375 s->block_last_index[n] = 63;
379 return ff_msmpeg4_decode_block(s, block, n, 1,
380 s->inter_scantable.permutated);
384 int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
386 Wmv2Context *const w = (Wmv2Context *) s;
387 int cbp, code, i, ret;
393 if (s->pict_type == AV_PICTURE_TYPE_P) {
394 if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {
397 for (i = 0; i < 6; i++)
398 s->block_last_index[i] = -1;
399 s->mv_dir = MV_DIR_FORWARD;
400 s->mv_type = MV_TYPE_16X16;
407 if (get_bits_left(&s->gb) <= 0)
408 return AVERROR_INVALIDDATA;
410 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table,
411 MB_NON_INTRA_VLC_BITS, 3);
413 return AVERROR_INVALIDDATA;
414 s->mb_intra = (~code & 0x40) >> 6;
419 if (get_bits_left(&s->gb) <= 0)
420 return AVERROR_INVALIDDATA;
421 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
423 av_log(s->avctx, AV_LOG_ERROR,
424 "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
425 return AVERROR_INVALIDDATA;
427 /* predict coded block pattern */
429 for (i = 0; i < 6; i++) {
430 int val = ((code >> (5 - i)) & 1);
432 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
436 cbp |= val << (5 - i);
442 wmv2_pred_motion(w, &mx, &my);
445 s->bdsp.clear_blocks(s->block[0]);
446 if (s->per_mb_rl_table) {
447 s->rl_table_index = decode012(&s->gb);
448 s->rl_chroma_table_index = s->rl_table_index;
451 if (w->abt_flag && w->per_mb_abt) {
452 w->per_block_abt = get_bits1(&s->gb);
453 if (!w->per_block_abt)
454 w->abt_type = decode012(&s->gb);
456 w->per_block_abt = 0;
459 if ((ret = wmv2_decode_motion(w, &mx, &my)) < 0)
462 s->mv_dir = MV_DIR_FORWARD;
463 s->mv_type = MV_TYPE_16X16;
467 for (i = 0; i < 6; i++) {
468 if ((ret = wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1)) < 0) {
469 av_log(s->avctx, AV_LOG_ERROR,
470 "\nerror while decoding inter block: %d x %d (%d)\n",
471 s->mb_x, s->mb_y, i);
476 if (s->pict_type == AV_PICTURE_TYPE_P)
477 ff_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
478 ff_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
479 ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0),
480 show_bits(&s->gb, 24));
481 s->ac_pred = get_bits1(&s->gb);
482 if (s->inter_intra_pred) {
483 s->h263_aic_dir = get_vlc2(&s->gb, ff_inter_intra_vlc.table,
484 INTER_INTRA_VLC_BITS, 1);
485 ff_dlog(s->avctx, "%d%d %d %d/",
486 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
488 if (s->per_mb_rl_table && cbp) {
489 s->rl_table_index = decode012(&s->gb);
490 s->rl_chroma_table_index = s->rl_table_index;
493 s->bdsp.clear_blocks(s->block[0]);
494 for (i = 0; i < 6; i++) {
495 if ((ret = ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL)) < 0) {
496 av_log(s->avctx, AV_LOG_ERROR,
497 "\nerror while decoding intra block: %d x %d (%d)\n",
498 s->mb_x, s->mb_y, i);
507 static av_cold int wmv2_decode_init(AVCodecContext *avctx)
509 Wmv2Context *const w = avctx->priv_data;
512 if ((ret = ff_msmpeg4_decode_init(avctx)) < 0)
515 ff_wmv2_common_init(w);
517 return ff_intrax8_common_init(avctx, &w->x8, &w->s.idsp,
518 w->s.block, w->s.block_last_index,
519 w->s.mb_width, w->s.mb_height);
522 static av_cold int wmv2_decode_end(AVCodecContext *avctx)
524 Wmv2Context *w = avctx->priv_data;
526 ff_intrax8_common_end(&w->x8);
527 return ff_h263_decode_end(avctx);
530 AVCodec ff_wmv2_decoder = {
532 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
533 .type = AVMEDIA_TYPE_VIDEO,
534 .id = AV_CODEC_ID_WMV2,
535 .priv_data_size = sizeof(Wmv2Context),
536 .init = wmv2_decode_init,
537 .close = wmv2_decode_end,
538 .decode = ff_h263_decode_frame,
539 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
540 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,