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  1. /*
  2. * H.263 decoder
  3. * Copyright (c) 2001 Fabrice Bellard.
  4. * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
  5. *
  6. * This library 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 of the License, or (at your option) any later version.
  10. *
  11. * This library 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.
  15. *
  16. * You should have received a copy of the GNU Lesser General Public
  17. * License along with this library; if not, write to the Free Software
  18. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19. */
  20. /**
  21. * @file h263dec.c
  22. * H.263 decoder.
  23. */
  24. #include "avcodec.h"
  25. #include "dsputil.h"
  26. #include "mpegvideo.h"
  27. //#define DEBUG
  28. //#define PRINT_FRAME_TIME
  29. int ff_h263_decode_init(AVCodecContext *avctx)
  30. {
  31. MpegEncContext *s = avctx->priv_data;
  32. s->avctx = avctx;
  33. s->out_format = FMT_H263;
  34. s->width = avctx->width;
  35. s->height = avctx->height;
  36. s->workaround_bugs= avctx->workaround_bugs;
  37. // set defaults
  38. MPV_decode_defaults(s);
  39. s->quant_precision=5;
  40. s->decode_mb= ff_h263_decode_mb;
  41. s->low_delay= 1;
  42. avctx->pix_fmt= PIX_FMT_YUV420P;
  43. s->unrestricted_mv= 1;
  44. /* select sub codec */
  45. switch(avctx->codec->id) {
  46. case CODEC_ID_H263:
  47. s->unrestricted_mv= 0;
  48. break;
  49. case CODEC_ID_MPEG4:
  50. s->decode_mb= ff_mpeg4_decode_mb;
  51. s->time_increment_bits = 4; /* default value for broken headers */
  52. s->h263_pred = 1;
  53. s->low_delay = 0; //default, might be overriden in the vol header during header parsing
  54. break;
  55. case CODEC_ID_MSMPEG4V1:
  56. s->h263_msmpeg4 = 1;
  57. s->h263_pred = 1;
  58. s->msmpeg4_version=1;
  59. break;
  60. case CODEC_ID_MSMPEG4V2:
  61. s->h263_msmpeg4 = 1;
  62. s->h263_pred = 1;
  63. s->msmpeg4_version=2;
  64. break;
  65. case CODEC_ID_MSMPEG4V3:
  66. s->h263_msmpeg4 = 1;
  67. s->h263_pred = 1;
  68. s->msmpeg4_version=3;
  69. break;
  70. case CODEC_ID_WMV1:
  71. s->h263_msmpeg4 = 1;
  72. s->h263_pred = 1;
  73. s->msmpeg4_version=4;
  74. break;
  75. case CODEC_ID_WMV2:
  76. s->h263_msmpeg4 = 1;
  77. s->h263_pred = 1;
  78. s->msmpeg4_version=5;
  79. break;
  80. case CODEC_ID_H263I:
  81. break;
  82. case CODEC_ID_FLV1:
  83. s->h263_flv = 1;
  84. break;
  85. default:
  86. return -1;
  87. }
  88. s->codec_id= avctx->codec->id;
  89. /* for h263, we allocate the images after having read the header */
  90. if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
  91. if (MPV_common_init(s) < 0)
  92. return -1;
  93. if (s->h263_msmpeg4)
  94. ff_msmpeg4_decode_init(s);
  95. else
  96. h263_decode_init_vlc(s);
  97. return 0;
  98. }
  99. int ff_h263_decode_end(AVCodecContext *avctx)
  100. {
  101. MpegEncContext *s = avctx->priv_data;
  102. MPV_common_end(s);
  103. return 0;
  104. }
  105. /**
  106. * retunrs the number of bytes consumed for building the current frame
  107. */
  108. static int get_consumed_bytes(MpegEncContext *s, int buf_size){
  109. int pos= (get_bits_count(&s->gb)+7)>>3;
  110. if(s->divx_packed){
  111. //we would have to scan through the whole buf to handle the weird reordering ...
  112. return buf_size;
  113. }else if(s->flags&CODEC_FLAG_TRUNCATED){
  114. pos -= s->parse_context.last_index;
  115. if(pos<0) pos=0; // padding is not really read so this might be -1
  116. return pos;
  117. }else{
  118. if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
  119. if(pos+10>buf_size) pos=buf_size; // oops ;)
  120. return pos;
  121. }
  122. }
  123. static int decode_slice(MpegEncContext *s){
  124. const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
  125. s->last_resync_gb= s->gb;
  126. s->first_slice_line= 1;
  127. s->resync_mb_x= s->mb_x;
  128. s->resync_mb_y= s->mb_y;
  129. ff_set_qscale(s, s->qscale);
  130. if(s->partitioned_frame){
  131. const int qscale= s->qscale;
  132. if(s->codec_id==CODEC_ID_MPEG4){
  133. if(ff_mpeg4_decode_partitions(s) < 0)
  134. return -1;
  135. }
  136. /* restore variables which were modified */
  137. s->first_slice_line=1;
  138. s->mb_x= s->resync_mb_x;
  139. s->mb_y= s->resync_mb_y;
  140. ff_set_qscale(s, qscale);
  141. }
  142. for(; s->mb_y < s->mb_height; s->mb_y++) {
  143. /* per-row end of slice checks */
  144. if(s->msmpeg4_version){
  145. if(s->resync_mb_y + s->slice_height == s->mb_y){
  146. ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
  147. return 0;
  148. }
  149. }
  150. if(s->msmpeg4_version==1){
  151. s->last_dc[0]=
  152. s->last_dc[1]=
  153. s->last_dc[2]= 128;
  154. }
  155. ff_init_block_index(s);
  156. for(; s->mb_x < s->mb_width; s->mb_x++) {
  157. int ret;
  158. ff_update_block_index(s);
  159. if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
  160. s->first_slice_line=0;
  161. }
  162. /* DCT & quantize */
  163. s->dsp.clear_blocks(s->block[0]);
  164. s->mv_dir = MV_DIR_FORWARD;
  165. s->mv_type = MV_TYPE_16X16;
  166. // s->mb_skiped = 0;
  167. //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
  168. ret= s->decode_mb(s, s->block);
  169. if (s->pict_type!=B_TYPE)
  170. ff_h263_update_motion_val(s);
  171. if(ret<0){
  172. const int xy= s->mb_x + s->mb_y*s->mb_stride;
  173. if(ret==SLICE_END){
  174. MPV_decode_mb(s, s->block);
  175. if(s->loop_filter)
  176. ff_h263_loop_filter(s);
  177. //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
  178. ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
  179. s->padding_bug_score--;
  180. if(++s->mb_x >= s->mb_width){
  181. s->mb_x=0;
  182. ff_draw_horiz_band(s, s->mb_y*16, 16);
  183. s->mb_y++;
  184. }
  185. return 0;
  186. }else if(ret==SLICE_NOEND){
  187. av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
  188. ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
  189. return -1;
  190. }
  191. av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
  192. ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
  193. return -1;
  194. }
  195. MPV_decode_mb(s, s->block);
  196. if(s->loop_filter)
  197. ff_h263_loop_filter(s);
  198. }
  199. ff_draw_horiz_band(s, s->mb_y*16, 16);
  200. s->mb_x= 0;
  201. }
  202. assert(s->mb_x==0 && s->mb_y==s->mb_height);
  203. /* try to detect the padding bug */
  204. if( s->codec_id==CODEC_ID_MPEG4
  205. && (s->workaround_bugs&FF_BUG_AUTODETECT)
  206. && s->gb.size_in_bits - get_bits_count(&s->gb) >=0
  207. && s->gb.size_in_bits - get_bits_count(&s->gb) < 48
  208. // && !s->resync_marker
  209. && !s->data_partitioning){
  210. const int bits_count= get_bits_count(&s->gb);
  211. const int bits_left = s->gb.size_in_bits - bits_count;
  212. if(bits_left==0){
  213. s->padding_bug_score+=16;
  214. }else if(bits_left>8){
  215. s->padding_bug_score++;
  216. } else if(bits_left != 1){
  217. int v= show_bits(&s->gb, 8);
  218. v|= 0x7F >> (7-(bits_count&7));
  219. if(v==0x7F)
  220. s->padding_bug_score--;
  221. else
  222. s->padding_bug_score++;
  223. }
  224. }
  225. // handle formats which dont have unique end markers
  226. if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
  227. int left= s->gb.size_in_bits - get_bits_count(&s->gb);
  228. int max_extra=7;
  229. /* no markers in M$ crap */
  230. if(s->msmpeg4_version && s->pict_type==I_TYPE)
  231. max_extra+= 17;
  232. /* buggy padding but the frame should still end approximately at the bitstream end */
  233. if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
  234. max_extra+= 48;
  235. else if((s->workaround_bugs&FF_BUG_NO_PADDING))
  236. max_extra+= 256*256*256*64;
  237. if(left>max_extra){
  238. av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
  239. }
  240. else if(left<0){
  241. av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
  242. }else
  243. ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
  244. return 0;
  245. }
  246. av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
  247. s->gb.size_in_bits - get_bits_count(&s->gb),
  248. show_bits(&s->gb, 24), s->padding_bug_score);
  249. ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
  250. return -1;
  251. }
  252. /**
  253. * finds the end of the current frame in the bitstream.
  254. * @return the position of the first byte of the next frame, or -1
  255. */
  256. static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
  257. ParseContext *pc= &s->parse_context;
  258. int vop_found, i;
  259. uint32_t state;
  260. vop_found= pc->frame_start_found;
  261. state= pc->state;
  262. i=0;
  263. if(!vop_found){
  264. for(i=0; i<buf_size; i++){
  265. state= (state<<8) | buf[i];
  266. if(state == 0x1B6){
  267. i++;
  268. vop_found=1;
  269. break;
  270. }
  271. }
  272. }
  273. if(vop_found){
  274. for(; i<buf_size; i++){
  275. state= (state<<8) | buf[i];
  276. if((state&0xFFFFFF00) == 0x100){
  277. pc->frame_start_found=0;
  278. pc->state=-1;
  279. return i-3;
  280. }
  281. }
  282. }
  283. pc->frame_start_found= vop_found;
  284. pc->state= state;
  285. return END_NOT_FOUND;
  286. }
  287. static int h263_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
  288. ParseContext *pc= &s->parse_context;
  289. int vop_found, i;
  290. uint32_t state;
  291. vop_found= pc->frame_start_found;
  292. state= pc->state;
  293. i=0;
  294. if(!vop_found){
  295. for(i=0; i<buf_size; i++){
  296. state= (state<<8) | buf[i];
  297. if(state>>(32-22) == 0x20){
  298. i++;
  299. vop_found=1;
  300. break;
  301. }
  302. }
  303. }
  304. if(vop_found){
  305. for(; i<buf_size; i++){
  306. state= (state<<8) | buf[i];
  307. if(state>>(32-22) == 0x20){
  308. pc->frame_start_found=0;
  309. pc->state=-1;
  310. return i-3;
  311. }
  312. }
  313. }
  314. pc->frame_start_found= vop_found;
  315. pc->state= state;
  316. return END_NOT_FOUND;
  317. }
  318. int ff_h263_decode_frame(AVCodecContext *avctx,
  319. void *data, int *data_size,
  320. uint8_t *buf, int buf_size)
  321. {
  322. MpegEncContext *s = avctx->priv_data;
  323. int ret;
  324. AVFrame *pict = data;
  325. #ifdef PRINT_FRAME_TIME
  326. uint64_t time= rdtsc();
  327. #endif
  328. #ifdef DEBUG
  329. printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
  330. printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
  331. #endif
  332. s->flags= avctx->flags;
  333. s->flags2= avctx->flags2;
  334. *data_size = 0;
  335. /* no supplementary picture */
  336. if (buf_size == 0) {
  337. /* special case for last picture */
  338. if (s->low_delay==0 && s->next_picture_ptr) {
  339. *pict= *(AVFrame*)s->next_picture_ptr;
  340. s->next_picture_ptr= NULL;
  341. *data_size = sizeof(AVFrame);
  342. }
  343. return 0;
  344. }
  345. if(s->flags&CODEC_FLAG_TRUNCATED){
  346. int next;
  347. if(s->codec_id==CODEC_ID_MPEG4){
  348. next= mpeg4_find_frame_end(s, buf, buf_size);
  349. }else if(s->codec_id==CODEC_ID_H263){
  350. next= h263_find_frame_end(s, buf, buf_size);
  351. }else{
  352. av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
  353. return -1;
  354. }
  355. if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
  356. return buf_size;
  357. }
  358. retry:
  359. if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
  360. init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
  361. }else
  362. init_get_bits(&s->gb, buf, buf_size*8);
  363. s->bitstream_buffer_size=0;
  364. if (!s->context_initialized) {
  365. if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
  366. return -1;
  367. }
  368. //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
  369. if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
  370. int i= ff_find_unused_picture(s, 0);
  371. s->current_picture_ptr= &s->picture[i];
  372. }
  373. /* let's go :-) */
  374. if (s->msmpeg4_version==5) {
  375. ret= ff_wmv2_decode_picture_header(s);
  376. } else if (s->msmpeg4_version) {
  377. ret = msmpeg4_decode_picture_header(s);
  378. } else if (s->h263_pred) {
  379. if(s->avctx->extradata_size && s->picture_number==0){
  380. GetBitContext gb;
  381. init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
  382. ret = ff_mpeg4_decode_picture_header(s, &gb);
  383. }
  384. ret = ff_mpeg4_decode_picture_header(s, &s->gb);
  385. if(s->flags& CODEC_FLAG_LOW_DELAY)
  386. s->low_delay=1;
  387. } else if (s->codec_id == CODEC_ID_H263I) {
  388. ret = intel_h263_decode_picture_header(s);
  389. } else if (s->h263_flv) {
  390. ret = flv_h263_decode_picture_header(s);
  391. } else {
  392. ret = h263_decode_picture_header(s);
  393. }
  394. if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
  395. /* skip if the header was thrashed */
  396. if (ret < 0){
  397. av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
  398. return -1;
  399. }
  400. avctx->has_b_frames= !s->low_delay;
  401. if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
  402. if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
  403. s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
  404. s->xvid_build= -1;
  405. #if 0
  406. if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
  407. && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
  408. s->xvid_build= -1;
  409. #endif
  410. }
  411. if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
  412. if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
  413. s->divx_version= 400; //divx 4
  414. }
  415. if(s->workaround_bugs&FF_BUG_AUTODETECT){
  416. s->workaround_bugs &= ~FF_BUG_NO_PADDING;
  417. if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
  418. s->workaround_bugs |= FF_BUG_NO_PADDING;
  419. if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
  420. s->workaround_bugs|= FF_BUG_XVID_ILACE;
  421. if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
  422. s->workaround_bugs|= FF_BUG_UMP4;
  423. }
  424. if(s->divx_version>=500){
  425. s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
  426. }
  427. if(s->divx_version>502){
  428. s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
  429. }
  430. if(s->xvid_build && s->xvid_build<=3)
  431. s->padding_bug_score= 256*256*256*64;
  432. if(s->xvid_build && s->xvid_build<=1)
  433. s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
  434. if(s->xvid_build && s->xvid_build<=12)
  435. s->workaround_bugs|= FF_BUG_EDGE;
  436. #define SET_QPEL_FUNC(postfix1, postfix2) \
  437. s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
  438. s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
  439. s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
  440. if(s->lavc_build && s->lavc_build<4653)
  441. s->workaround_bugs|= FF_BUG_STD_QPEL;
  442. if(s->lavc_build && s->lavc_build<4655)
  443. s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
  444. if(s->lavc_build && s->lavc_build<4670){
  445. s->workaround_bugs|= FF_BUG_EDGE;
  446. }
  447. if(s->divx_version)
  448. s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
  449. //printf("padding_bug_score: %d\n", s->padding_bug_score);
  450. if(s->divx_version==501 && s->divx_build==20020416)
  451. s->padding_bug_score= 256*256*256*64;
  452. if(s->divx_version && s->divx_version<500){
  453. s->workaround_bugs|= FF_BUG_EDGE;
  454. }
  455. if(s->divx_version)
  456. s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
  457. #if 0
  458. if(s->divx_version==500)
  459. s->padding_bug_score= 256*256*256*64;
  460. /* very ugly XVID padding bug detection FIXME/XXX solve this differently
  461. * lets hope this at least works
  462. */
  463. if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
  464. && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
  465. s->workaround_bugs|= FF_BUG_NO_PADDING;
  466. if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
  467. s->workaround_bugs|= FF_BUG_NO_PADDING;
  468. #endif
  469. }
  470. if(s->workaround_bugs& FF_BUG_STD_QPEL){
  471. SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
  472. SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
  473. SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
  474. SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
  475. SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
  476. SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
  477. SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
  478. SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
  479. SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
  480. SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
  481. SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
  482. SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
  483. }
  484. if(avctx->debug & FF_DEBUG_BUGS)
  485. av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
  486. s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
  487. s->divx_packed ? "p" : "");
  488. #if 0 // dump bits per frame / qp / complexity
  489. {
  490. static FILE *f=NULL;
  491. if(!f) f=fopen("rate_qp_cplx.txt", "w");
  492. fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
  493. }
  494. #endif
  495. /* After H263 & mpeg4 header decode we have the height, width,*/
  496. /* and other parameters. So then we could init the picture */
  497. /* FIXME: By the way H263 decoder is evolving it should have */
  498. /* an H263EncContext */
  499. if ( s->width != avctx->width || s->height != avctx->height) {
  500. /* H.263 could change picture size any time */
  501. ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
  502. s->parse_context.buffer=0;
  503. MPV_common_end(s);
  504. s->parse_context= pc;
  505. }
  506. if (!s->context_initialized) {
  507. avctx->width = s->width;
  508. avctx->height = s->height;
  509. goto retry;
  510. }
  511. if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
  512. s->gob_index = ff_h263_get_gob_height(s);
  513. // for hurry_up==5
  514. s->current_picture.pict_type= s->pict_type;
  515. s->current_picture.key_frame= s->pict_type == I_TYPE;
  516. /* skip b frames if we dont have reference frames */
  517. if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
  518. /* skip b frames if we are in a hurry */
  519. if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
  520. /* skip everything if we are in a hurry>=5 */
  521. if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
  522. if(s->next_p_frame_damaged){
  523. if(s->pict_type==B_TYPE)
  524. return get_consumed_bytes(s, buf_size);
  525. else
  526. s->next_p_frame_damaged=0;
  527. }
  528. if(MPV_frame_start(s, avctx) < 0)
  529. return -1;
  530. #ifdef DEBUG
  531. printf("qscale=%d\n", s->qscale);
  532. #endif
  533. ff_er_frame_start(s);
  534. //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
  535. //which isnt available before MPV_frame_start()
  536. if (s->msmpeg4_version==5){
  537. if(ff_wmv2_decode_secondary_picture_header(s) < 0)
  538. return -1;
  539. }
  540. /* decode each macroblock */
  541. s->mb_x=0;
  542. s->mb_y=0;
  543. decode_slice(s);
  544. while(s->mb_y<s->mb_height){
  545. if(s->msmpeg4_version){
  546. if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
  547. break;
  548. }else{
  549. if(ff_h263_resync(s)<0)
  550. break;
  551. }
  552. if(s->msmpeg4_version<4 && s->h263_pred)
  553. ff_mpeg4_clean_buffers(s);
  554. decode_slice(s);
  555. }
  556. if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
  557. if(msmpeg4_decode_ext_header(s, buf_size) < 0){
  558. s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
  559. }
  560. /* divx 5.01+ bistream reorder stuff */
  561. if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
  562. int current_pos= get_bits_count(&s->gb)>>3;
  563. int startcode_found=0;
  564. if( buf_size - current_pos > 5
  565. && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
  566. int i;
  567. for(i=current_pos; i<buf_size-3; i++){
  568. if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
  569. startcode_found=1;
  570. break;
  571. }
  572. }
  573. }
  574. if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
  575. startcode_found=1;
  576. current_pos=0;
  577. }
  578. if(startcode_found){
  579. memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
  580. s->bitstream_buffer_size= buf_size - current_pos;
  581. }
  582. }
  583. ff_er_frame_end(s);
  584. MPV_frame_end(s);
  585. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
  586. assert(s->current_picture.pict_type == s->pict_type);
  587. if(s->pict_type==B_TYPE || s->low_delay){
  588. *pict= *(AVFrame*)&s->current_picture;
  589. ff_print_debug_info(s, pict);
  590. } else {
  591. *pict= *(AVFrame*)&s->last_picture;
  592. if(pict)
  593. ff_print_debug_info(s, pict);
  594. }
  595. /* Return the Picture timestamp as the frame number */
  596. /* we substract 1 because it is added on utils.c */
  597. avctx->frame_number = s->picture_number - 1;
  598. /* dont output the last pic after seeking */
  599. if(s->last_picture_ptr || s->low_delay)
  600. *data_size = sizeof(AVFrame);
  601. #ifdef PRINT_FRAME_TIME
  602. printf("%Ld\n", rdtsc()-time);
  603. #endif
  604. return get_consumed_bytes(s, buf_size);
  605. }
  606. static const AVOption mpeg4_decoptions[] =
  607. {
  608. AVOPTION_SUB(avoptions_workaround_bug),
  609. AVOPTION_END()
  610. };
  611. AVCodec mpeg4_decoder = {
  612. "mpeg4",
  613. CODEC_TYPE_VIDEO,
  614. CODEC_ID_MPEG4,
  615. sizeof(MpegEncContext),
  616. ff_h263_decode_init,
  617. NULL,
  618. ff_h263_decode_end,
  619. ff_h263_decode_frame,
  620. CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
  621. .options = mpeg4_decoptions,
  622. .flush= ff_mpeg_flush,
  623. };
  624. AVCodec h263_decoder = {
  625. "h263",
  626. CODEC_TYPE_VIDEO,
  627. CODEC_ID_H263,
  628. sizeof(MpegEncContext),
  629. ff_h263_decode_init,
  630. NULL,
  631. ff_h263_decode_end,
  632. ff_h263_decode_frame,
  633. CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
  634. .flush= ff_mpeg_flush,
  635. };
  636. AVCodec msmpeg4v1_decoder = {
  637. "msmpeg4v1",
  638. CODEC_TYPE_VIDEO,
  639. CODEC_ID_MSMPEG4V1,
  640. sizeof(MpegEncContext),
  641. ff_h263_decode_init,
  642. NULL,
  643. ff_h263_decode_end,
  644. ff_h263_decode_frame,
  645. CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
  646. mpeg4_decoptions,
  647. };
  648. AVCodec msmpeg4v2_decoder = {
  649. "msmpeg4v2",
  650. CODEC_TYPE_VIDEO,
  651. CODEC_ID_MSMPEG4V2,
  652. sizeof(MpegEncContext),
  653. ff_h263_decode_init,
  654. NULL,
  655. ff_h263_decode_end,
  656. ff_h263_decode_frame,
  657. CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
  658. mpeg4_decoptions,
  659. };
  660. AVCodec msmpeg4v3_decoder = {
  661. "msmpeg4",
  662. CODEC_TYPE_VIDEO,
  663. CODEC_ID_MSMPEG4V3,
  664. sizeof(MpegEncContext),
  665. ff_h263_decode_init,
  666. NULL,
  667. ff_h263_decode_end,
  668. ff_h263_decode_frame,
  669. CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
  670. .options = mpeg4_decoptions,
  671. };
  672. AVCodec wmv1_decoder = {
  673. "wmv1",
  674. CODEC_TYPE_VIDEO,
  675. CODEC_ID_WMV1,
  676. sizeof(MpegEncContext),
  677. ff_h263_decode_init,
  678. NULL,
  679. ff_h263_decode_end,
  680. ff_h263_decode_frame,
  681. CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
  682. mpeg4_decoptions,
  683. };
  684. AVCodec h263i_decoder = {
  685. "h263i",
  686. CODEC_TYPE_VIDEO,
  687. CODEC_ID_H263I,
  688. sizeof(MpegEncContext),
  689. ff_h263_decode_init,
  690. NULL,
  691. ff_h263_decode_end,
  692. ff_h263_decode_frame,
  693. CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
  694. mpeg4_decoptions,
  695. };
  696. AVCodec flv_decoder = {
  697. "flv",
  698. CODEC_TYPE_VIDEO,
  699. CODEC_ID_FLV1,
  700. sizeof(MpegEncContext),
  701. ff_h263_decode_init,
  702. NULL,
  703. ff_h263_decode_end,
  704. ff_h263_decode_frame,
  705. CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
  706. };