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 void wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
283 MpegEncContext *const s = &w->s;
285 ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
287 if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel)
288 w->hshift = get_bits1(&s->gb);
293 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py)
295 MpegEncContext *const s = &w->s;
296 int xy, wrap, diff, type;
297 int16_t *A, *B, *C, *mot_val;
300 xy = s->block_index[0];
302 mot_val = s->current_picture.motion_val[0][xy];
304 A = s->current_picture.motion_val[0][xy - 1];
305 B = s->current_picture.motion_val[0][xy - wrap];
306 C = s->current_picture.motion_val[0][xy + 2 - wrap];
308 if (s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
309 diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
314 type = get_bits1(&s->gb);
321 } else if (type == 1) {
325 /* special case for first (slice) line */
326 if (s->first_slice_line) {
330 *px = mid_pred(A[0], B[0], C[0]);
331 *py = mid_pred(A[1], B[1], C[1]);
338 static inline int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block,
341 MpegEncContext *const s = &w->s;
342 static const int sub_cbp_table[3] = { 2, 3, 1 };
346 s->block_last_index[n] = -1;
350 if (w->per_block_abt)
351 w->abt_type = decode012(&s->gb);
352 w->abt_type_table[n] = w->abt_type;
355 // const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].permutated;
356 const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].scantable;
357 // const uint8_t *scantable = w->abt_type - 1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
359 sub_cbp = sub_cbp_table[decode012(&s->gb)];
362 if ((ret = ff_msmpeg4_decode_block(s, block, n, 1, scantable)) < 0)
366 if ((ret = ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable)) < 0)
369 s->block_last_index[n] = 63;
373 return ff_msmpeg4_decode_block(s, block, n, 1,
374 s->inter_scantable.permutated);
378 int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
380 Wmv2Context *const w = (Wmv2Context *) s;
381 int cbp, code, i, ret;
387 if (s->pict_type == AV_PICTURE_TYPE_P) {
388 if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {
391 for (i = 0; i < 6; i++)
392 s->block_last_index[i] = -1;
393 s->mv_dir = MV_DIR_FORWARD;
394 s->mv_type = MV_TYPE_16X16;
401 if (get_bits_left(&s->gb) <= 0)
402 return AVERROR_INVALIDDATA;
404 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table,
405 MB_NON_INTRA_VLC_BITS, 3);
406 s->mb_intra = (~code & 0x40) >> 6;
411 if (get_bits_left(&s->gb) <= 0)
412 return AVERROR_INVALIDDATA;
413 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
414 /* predict coded block pattern */
416 for (i = 0; i < 6; i++) {
417 int val = ((code >> (5 - i)) & 1);
419 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
423 cbp |= val << (5 - i);
429 wmv2_pred_motion(w, &mx, &my);
432 s->bdsp.clear_blocks(s->block[0]);
433 if (s->per_mb_rl_table) {
434 s->rl_table_index = decode012(&s->gb);
435 s->rl_chroma_table_index = s->rl_table_index;
438 if (w->abt_flag && w->per_mb_abt) {
439 w->per_block_abt = get_bits1(&s->gb);
440 if (!w->per_block_abt)
441 w->abt_type = decode012(&s->gb);
443 w->per_block_abt = 0;
446 wmv2_decode_motion(w, &mx, &my);
448 s->mv_dir = MV_DIR_FORWARD;
449 s->mv_type = MV_TYPE_16X16;
453 for (i = 0; i < 6; i++) {
454 if ((ret = wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1)) < 0) {
455 av_log(s->avctx, AV_LOG_ERROR,
456 "\nerror while decoding inter block: %d x %d (%d)\n",
457 s->mb_x, s->mb_y, i);
462 if (s->pict_type == AV_PICTURE_TYPE_P)
463 ff_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
464 ff_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
465 ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0),
466 show_bits(&s->gb, 24));
467 s->ac_pred = get_bits1(&s->gb);
468 if (s->inter_intra_pred) {
469 s->h263_aic_dir = get_vlc2(&s->gb, ff_inter_intra_vlc.table,
470 INTER_INTRA_VLC_BITS, 1);
471 ff_dlog(s->avctx, "%d%d %d %d/",
472 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
474 if (s->per_mb_rl_table && cbp) {
475 s->rl_table_index = decode012(&s->gb);
476 s->rl_chroma_table_index = s->rl_table_index;
479 s->bdsp.clear_blocks(s->block[0]);
480 for (i = 0; i < 6; i++) {
481 if ((ret = ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL)) < 0) {
482 av_log(s->avctx, AV_LOG_ERROR,
483 "\nerror while decoding intra block: %d x %d (%d)\n",
484 s->mb_x, s->mb_y, i);
493 static av_cold int wmv2_decode_init(AVCodecContext *avctx)
495 Wmv2Context *const w = avctx->priv_data;
498 if ((ret = ff_msmpeg4_decode_init(avctx)) < 0)
501 ff_wmv2_common_init(w);
503 return ff_intrax8_common_init(avctx, &w->x8, &w->s.idsp,
504 w->s.block, w->s.block_last_index,
505 w->s.mb_width, w->s.mb_height);
508 static av_cold int wmv2_decode_end(AVCodecContext *avctx)
510 Wmv2Context *w = avctx->priv_data;
512 ff_intrax8_common_end(&w->x8);
513 return ff_h263_decode_end(avctx);
516 AVCodec ff_wmv2_decoder = {
518 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
519 .type = AVMEDIA_TYPE_VIDEO,
520 .id = AV_CODEC_ID_WMV2,
521 .priv_data_size = sizeof(Wmv2Context),
522 .init = wmv2_decode_init,
523 .close = wmv2_decode_end,
524 .decode = ff_h263_decode_frame,
525 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
526 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
527 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,