| 1 | /* |
| 2 | * H.263 decoder |
| 3 | * Copyright (c) 2001 Fabrice Bellard |
| 4 | * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | /** |
| 24 | * @file |
| 25 | * H.263 decoder. |
| 26 | */ |
| 27 | |
| 28 | #define UNCHECKED_BITSTREAM_READER 1 |
| 29 | |
| 30 | #include "libavutil/cpu.h" |
| 31 | #include "avcodec.h" |
| 32 | #include "error_resilience.h" |
| 33 | #include "flv.h" |
| 34 | #include "h263.h" |
| 35 | #include "h263_parser.h" |
| 36 | #include "internal.h" |
| 37 | #include "mpeg_er.h" |
| 38 | #include "mpeg4video.h" |
| 39 | #include "mpeg4video_parser.h" |
| 40 | #include "mpegvideo.h" |
| 41 | #include "msmpeg4.h" |
| 42 | #include "qpeldsp.h" |
| 43 | #include "vdpau_internal.h" |
| 44 | #include "thread.h" |
| 45 | |
| 46 | av_cold int ff_h263_decode_init(AVCodecContext *avctx) |
| 47 | { |
| 48 | MpegEncContext *s = avctx->priv_data; |
| 49 | int ret; |
| 50 | |
| 51 | s->out_format = FMT_H263; |
| 52 | |
| 53 | // set defaults |
| 54 | ff_mpv_decode_defaults(s); |
| 55 | ff_mpv_decode_init(s, avctx); |
| 56 | |
| 57 | s->quant_precision = 5; |
| 58 | s->decode_mb = ff_h263_decode_mb; |
| 59 | s->low_delay = 1; |
| 60 | if (avctx->codec->id == AV_CODEC_ID_MSS2) |
| 61 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 62 | else |
| 63 | avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts); |
| 64 | s->unrestricted_mv = 1; |
| 65 | |
| 66 | /* select sub codec */ |
| 67 | switch (avctx->codec->id) { |
| 68 | case AV_CODEC_ID_H263: |
| 69 | case AV_CODEC_ID_H263P: |
| 70 | s->unrestricted_mv = 0; |
| 71 | avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; |
| 72 | break; |
| 73 | case AV_CODEC_ID_MPEG4: |
| 74 | break; |
| 75 | case AV_CODEC_ID_MSMPEG4V1: |
| 76 | s->h263_pred = 1; |
| 77 | s->msmpeg4_version = 1; |
| 78 | break; |
| 79 | case AV_CODEC_ID_MSMPEG4V2: |
| 80 | s->h263_pred = 1; |
| 81 | s->msmpeg4_version = 2; |
| 82 | break; |
| 83 | case AV_CODEC_ID_MSMPEG4V3: |
| 84 | s->h263_pred = 1; |
| 85 | s->msmpeg4_version = 3; |
| 86 | break; |
| 87 | case AV_CODEC_ID_WMV1: |
| 88 | s->h263_pred = 1; |
| 89 | s->msmpeg4_version = 4; |
| 90 | break; |
| 91 | case AV_CODEC_ID_WMV2: |
| 92 | s->h263_pred = 1; |
| 93 | s->msmpeg4_version = 5; |
| 94 | break; |
| 95 | case AV_CODEC_ID_VC1: |
| 96 | case AV_CODEC_ID_WMV3: |
| 97 | case AV_CODEC_ID_VC1IMAGE: |
| 98 | case AV_CODEC_ID_WMV3IMAGE: |
| 99 | case AV_CODEC_ID_MSS2: |
| 100 | s->h263_pred = 1; |
| 101 | s->msmpeg4_version = 6; |
| 102 | avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; |
| 103 | break; |
| 104 | case AV_CODEC_ID_H263I: |
| 105 | break; |
| 106 | case AV_CODEC_ID_FLV1: |
| 107 | s->h263_flv = 1; |
| 108 | break; |
| 109 | default: |
| 110 | av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n", |
| 111 | avctx->codec->id); |
| 112 | return AVERROR(ENOSYS); |
| 113 | } |
| 114 | s->codec_id = avctx->codec->id; |
| 115 | |
| 116 | if (avctx->stream_codec_tag == AV_RL32("l263") && avctx->extradata_size == 56 && avctx->extradata[0] == 1) |
| 117 | s->ehc_mode = 1; |
| 118 | |
| 119 | /* for h263, we allocate the images after having read the header */ |
| 120 | if (avctx->codec->id != AV_CODEC_ID_H263 && |
| 121 | avctx->codec->id != AV_CODEC_ID_H263P && |
| 122 | avctx->codec->id != AV_CODEC_ID_MPEG4) { |
| 123 | ff_mpv_idct_init(s); |
| 124 | if ((ret = ff_mpv_common_init(s)) < 0) |
| 125 | return ret; |
| 126 | } |
| 127 | |
| 128 | ff_h263dsp_init(&s->h263dsp); |
| 129 | ff_qpeldsp_init(&s->qdsp); |
| 130 | ff_h263_decode_init_vlc(); |
| 131 | |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | av_cold int ff_h263_decode_end(AVCodecContext *avctx) |
| 136 | { |
| 137 | MpegEncContext *s = avctx->priv_data; |
| 138 | |
| 139 | ff_mpv_common_end(s); |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Return the number of bytes consumed for building the current frame. |
| 145 | */ |
| 146 | static int get_consumed_bytes(MpegEncContext *s, int buf_size) |
| 147 | { |
| 148 | int pos = (get_bits_count(&s->gb) + 7) >> 3; |
| 149 | |
| 150 | if (s->divx_packed || s->avctx->hwaccel) { |
| 151 | /* We would have to scan through the whole buf to handle the weird |
| 152 | * reordering ... */ |
| 153 | return buf_size; |
| 154 | } else if (s->flags & CODEC_FLAG_TRUNCATED) { |
| 155 | pos -= s->parse_context.last_index; |
| 156 | // padding is not really read so this might be -1 |
| 157 | if (pos < 0) |
| 158 | pos = 0; |
| 159 | return pos; |
| 160 | } else { |
| 161 | // avoid infinite loops (maybe not needed...) |
| 162 | if (pos == 0) |
| 163 | pos = 1; |
| 164 | // oops ;) |
| 165 | if (pos + 10 > buf_size) |
| 166 | pos = buf_size; |
| 167 | |
| 168 | return pos; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | static int decode_slice(MpegEncContext *s) |
| 173 | { |
| 174 | const int part_mask = s->partitioned_frame |
| 175 | ? (ER_AC_END | ER_AC_ERROR) : 0x7F; |
| 176 | const int mb_size = 16 >> s->avctx->lowres; |
| 177 | int ret; |
| 178 | |
| 179 | s->last_resync_gb = s->gb; |
| 180 | s->first_slice_line = 1; |
| 181 | s->resync_mb_x = s->mb_x; |
| 182 | s->resync_mb_y = s->mb_y; |
| 183 | |
| 184 | ff_set_qscale(s, s->qscale); |
| 185 | |
| 186 | if (s->avctx->hwaccel) { |
| 187 | const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8; |
| 188 | ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start); |
| 189 | // ensure we exit decode loop |
| 190 | s->mb_y = s->mb_height; |
| 191 | return ret; |
| 192 | } |
| 193 | |
| 194 | if (s->partitioned_frame) { |
| 195 | const int qscale = s->qscale; |
| 196 | |
| 197 | if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) |
| 198 | if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0) |
| 199 | return ret; |
| 200 | |
| 201 | /* restore variables which were modified */ |
| 202 | s->first_slice_line = 1; |
| 203 | s->mb_x = s->resync_mb_x; |
| 204 | s->mb_y = s->resync_mb_y; |
| 205 | ff_set_qscale(s, qscale); |
| 206 | } |
| 207 | |
| 208 | for (; s->mb_y < s->mb_height; s->mb_y++) { |
| 209 | /* per-row end of slice checks */ |
| 210 | if (s->msmpeg4_version) { |
| 211 | if (s->resync_mb_y + s->slice_height == s->mb_y) { |
| 212 | ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, |
| 213 | s->mb_x - 1, s->mb_y, ER_MB_END); |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | if (s->msmpeg4_version == 1) { |
| 220 | s->last_dc[0] = |
| 221 | s->last_dc[1] = |
| 222 | s->last_dc[2] = 128; |
| 223 | } |
| 224 | |
| 225 | ff_init_block_index(s); |
| 226 | for (; s->mb_x < s->mb_width; s->mb_x++) { |
| 227 | int ret; |
| 228 | |
| 229 | ff_update_block_index(s); |
| 230 | |
| 231 | if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y) |
| 232 | s->first_slice_line = 0; |
| 233 | |
| 234 | /* DCT & quantize */ |
| 235 | |
| 236 | s->mv_dir = MV_DIR_FORWARD; |
| 237 | s->mv_type = MV_TYPE_16X16; |
| 238 | av_dlog(s, "%d %d %06X\n", |
| 239 | ret, get_bits_count(&s->gb), show_bits(&s->gb, 24)); |
| 240 | |
| 241 | tprintf(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y); |
| 242 | ret = s->decode_mb(s, s->block); |
| 243 | |
| 244 | if (s->pict_type != AV_PICTURE_TYPE_B) |
| 245 | ff_h263_update_motion_val(s); |
| 246 | |
| 247 | if (ret < 0) { |
| 248 | const int xy = s->mb_x + s->mb_y * s->mb_stride; |
| 249 | if (ret == SLICE_END) { |
| 250 | ff_mpv_decode_mb(s, s->block); |
| 251 | if (s->loop_filter) |
| 252 | ff_h263_loop_filter(s); |
| 253 | |
| 254 | ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, |
| 255 | s->mb_x, s->mb_y, ER_MB_END & part_mask); |
| 256 | |
| 257 | s->padding_bug_score--; |
| 258 | |
| 259 | if (++s->mb_x >= s->mb_width) { |
| 260 | s->mb_x = 0; |
| 261 | ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size); |
| 262 | ff_mpv_report_decode_progress(s); |
| 263 | s->mb_y++; |
| 264 | } |
| 265 | return 0; |
| 266 | } else if (ret == SLICE_NOEND) { |
| 267 | av_log(s->avctx, AV_LOG_ERROR, |
| 268 | "Slice mismatch at MB: %d\n", xy); |
| 269 | ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, |
| 270 | s->mb_x + 1, s->mb_y, |
| 271 | ER_MB_END & part_mask); |
| 272 | return AVERROR_INVALIDDATA; |
| 273 | } |
| 274 | av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy); |
| 275 | ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, |
| 276 | s->mb_x, s->mb_y, ER_MB_ERROR & part_mask); |
| 277 | |
| 278 | if (s->err_recognition & AV_EF_IGNORE_ERR) |
| 279 | continue; |
| 280 | return AVERROR_INVALIDDATA; |
| 281 | } |
| 282 | |
| 283 | ff_mpv_decode_mb(s, s->block); |
| 284 | if (s->loop_filter) |
| 285 | ff_h263_loop_filter(s); |
| 286 | } |
| 287 | |
| 288 | ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size); |
| 289 | ff_mpv_report_decode_progress(s); |
| 290 | |
| 291 | s->mb_x = 0; |
| 292 | } |
| 293 | |
| 294 | av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height); |
| 295 | |
| 296 | if (s->codec_id == AV_CODEC_ID_MPEG4 && |
| 297 | (s->workaround_bugs & FF_BUG_AUTODETECT) && |
| 298 | get_bits_left(&s->gb) >= 48 && |
| 299 | show_bits(&s->gb, 24) == 0x4010 && |
| 300 | !s->data_partitioning) |
| 301 | s->padding_bug_score += 32; |
| 302 | |
| 303 | /* try to detect the padding bug */ |
| 304 | if (s->codec_id == AV_CODEC_ID_MPEG4 && |
| 305 | (s->workaround_bugs & FF_BUG_AUTODETECT) && |
| 306 | get_bits_left(&s->gb) >= 0 && |
| 307 | get_bits_left(&s->gb) < 137 && |
| 308 | !s->data_partitioning) { |
| 309 | const int bits_count = get_bits_count(&s->gb); |
| 310 | const int bits_left = s->gb.size_in_bits - bits_count; |
| 311 | |
| 312 | if (bits_left == 0) { |
| 313 | s->padding_bug_score += 16; |
| 314 | } else if (bits_left != 1) { |
| 315 | int v = show_bits(&s->gb, 8); |
| 316 | v |= 0x7F >> (7 - (bits_count & 7)); |
| 317 | |
| 318 | if (v == 0x7F && bits_left <= 8) |
| 319 | s->padding_bug_score--; |
| 320 | else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) && |
| 321 | bits_left <= 16) |
| 322 | s->padding_bug_score += 4; |
| 323 | else |
| 324 | s->padding_bug_score++; |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | if (s->codec_id == AV_CODEC_ID_H263 && |
| 329 | (s->workaround_bugs & FF_BUG_AUTODETECT) && |
| 330 | get_bits_left(&s->gb) >= 8 && |
| 331 | get_bits_left(&s->gb) < 300 && |
| 332 | s->pict_type == AV_PICTURE_TYPE_I && |
| 333 | show_bits(&s->gb, 8) == 0 && |
| 334 | !s->data_partitioning) { |
| 335 | |
| 336 | s->padding_bug_score += 32; |
| 337 | } |
| 338 | |
| 339 | if (s->codec_id == AV_CODEC_ID_H263 && |
| 340 | (s->workaround_bugs & FF_BUG_AUTODETECT) && |
| 341 | get_bits_left(&s->gb) >= 64 && |
| 342 | AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) { |
| 343 | |
| 344 | s->padding_bug_score += 32; |
| 345 | } |
| 346 | |
| 347 | if (s->workaround_bugs & FF_BUG_AUTODETECT) { |
| 348 | if (s->padding_bug_score > -2 && !s->data_partitioning) |
| 349 | s->workaround_bugs |= FF_BUG_NO_PADDING; |
| 350 | else |
| 351 | s->workaround_bugs &= ~FF_BUG_NO_PADDING; |
| 352 | } |
| 353 | |
| 354 | // handle formats which don't have unique end markers |
| 355 | if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly |
| 356 | int left = get_bits_left(&s->gb); |
| 357 | int max_extra = 7; |
| 358 | |
| 359 | /* no markers in M$ crap */ |
| 360 | if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I) |
| 361 | max_extra += 17; |
| 362 | |
| 363 | /* buggy padding but the frame should still end approximately at |
| 364 | * the bitstream end */ |
| 365 | if ((s->workaround_bugs & FF_BUG_NO_PADDING) && |
| 366 | (s->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE))) |
| 367 | max_extra += 48; |
| 368 | else if ((s->workaround_bugs & FF_BUG_NO_PADDING)) |
| 369 | max_extra += 256 * 256 * 256 * 64; |
| 370 | |
| 371 | if (left > max_extra) |
| 372 | av_log(s->avctx, AV_LOG_ERROR, |
| 373 | "discarding %d junk bits at end, next would be %X\n", |
| 374 | left, show_bits(&s->gb, 24)); |
| 375 | else if (left < 0) |
| 376 | av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left); |
| 377 | else |
| 378 | ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, |
| 379 | s->mb_x - 1, s->mb_y, ER_MB_END); |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | av_log(s->avctx, AV_LOG_ERROR, |
| 385 | "slice end not reached but screenspace end (%d left %06X, score= %d)\n", |
| 386 | get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score); |
| 387 | |
| 388 | ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, |
| 389 | ER_MB_END & part_mask); |
| 390 | |
| 391 | return AVERROR_INVALIDDATA; |
| 392 | } |
| 393 | |
| 394 | int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| 395 | AVPacket *avpkt) |
| 396 | { |
| 397 | const uint8_t *buf = avpkt->data; |
| 398 | int buf_size = avpkt->size; |
| 399 | MpegEncContext *s = avctx->priv_data; |
| 400 | int ret; |
| 401 | int slice_ret = 0; |
| 402 | AVFrame *pict = data; |
| 403 | |
| 404 | s->flags = avctx->flags; |
| 405 | s->flags2 = avctx->flags2; |
| 406 | |
| 407 | /* no supplementary picture */ |
| 408 | if (buf_size == 0) { |
| 409 | /* special case for last picture */ |
| 410 | if (s->low_delay == 0 && s->next_picture_ptr) { |
| 411 | if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0) |
| 412 | return ret; |
| 413 | s->next_picture_ptr = NULL; |
| 414 | |
| 415 | *got_frame = 1; |
| 416 | } |
| 417 | |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | if (s->flags & CODEC_FLAG_TRUNCATED) { |
| 422 | int next; |
| 423 | |
| 424 | if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) { |
| 425 | next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); |
| 426 | } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) { |
| 427 | next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size); |
| 428 | } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) { |
| 429 | next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size); |
| 430 | } else { |
| 431 | av_log(s->avctx, AV_LOG_ERROR, |
| 432 | "this codec does not support truncated bitstreams\n"); |
| 433 | return AVERROR(ENOSYS); |
| 434 | } |
| 435 | |
| 436 | if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, |
| 437 | &buf_size) < 0) |
| 438 | return buf_size; |
| 439 | } |
| 440 | |
| 441 | retry: |
| 442 | if (s->divx_packed && s->bitstream_buffer_size) { |
| 443 | int i; |
| 444 | for(i=0; i < buf_size-3; i++) { |
| 445 | if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) { |
| 446 | if (buf[i+3]==0xB0) { |
| 447 | av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n"); |
| 448 | s->bitstream_buffer_size = 0; |
| 449 | } |
| 450 | break; |
| 451 | } |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder |
| 456 | ret = init_get_bits8(&s->gb, s->bitstream_buffer, |
| 457 | s->bitstream_buffer_size); |
| 458 | else |
| 459 | ret = init_get_bits8(&s->gb, buf, buf_size); |
| 460 | |
| 461 | s->bitstream_buffer_size = 0; |
| 462 | if (ret < 0) |
| 463 | return ret; |
| 464 | |
| 465 | if (!s->context_initialized) |
| 466 | // we need the idct permutaton for reading a custom matrix |
| 467 | ff_mpv_idct_init(s); |
| 468 | |
| 469 | /* let's go :-) */ |
| 470 | if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) { |
| 471 | ret = ff_wmv2_decode_picture_header(s); |
| 472 | } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) { |
| 473 | ret = ff_msmpeg4_decode_picture_header(s); |
| 474 | } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) { |
| 475 | if (s->avctx->extradata_size && s->picture_number == 0) { |
| 476 | GetBitContext gb; |
| 477 | |
| 478 | if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 ) |
| 479 | ff_mpeg4_decode_picture_header(avctx->priv_data, &gb); |
| 480 | } |
| 481 | ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb); |
| 482 | } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) { |
| 483 | ret = ff_intel_h263_decode_picture_header(s); |
| 484 | } else if (CONFIG_FLV_DECODER && s->h263_flv) { |
| 485 | ret = ff_flv_decode_picture_header(s); |
| 486 | } else { |
| 487 | ret = ff_h263_decode_picture_header(s); |
| 488 | } |
| 489 | |
| 490 | if (ret < 0 || ret == FRAME_SKIPPED) { |
| 491 | if ( s->width != avctx->coded_width |
| 492 | || s->height != avctx->coded_height) { |
| 493 | av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n"); |
| 494 | s->width = avctx->coded_width; |
| 495 | s->height= avctx->coded_height; |
| 496 | } |
| 497 | } |
| 498 | if (ret == FRAME_SKIPPED) |
| 499 | return get_consumed_bytes(s, buf_size); |
| 500 | |
| 501 | /* skip if the header was thrashed */ |
| 502 | if (ret < 0) { |
| 503 | av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); |
| 504 | return ret; |
| 505 | } |
| 506 | |
| 507 | if (!s->context_initialized) |
| 508 | if ((ret = ff_mpv_common_init(s)) < 0) |
| 509 | return ret; |
| 510 | |
| 511 | if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) { |
| 512 | int i = ff_find_unused_picture(s, 0); |
| 513 | if (i < 0) |
| 514 | return i; |
| 515 | s->current_picture_ptr = &s->picture[i]; |
| 516 | } |
| 517 | |
| 518 | avctx->has_b_frames = !s->low_delay; |
| 519 | |
| 520 | if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) { |
| 521 | if (ff_mpeg4_workaround_bugs(avctx) == 1) |
| 522 | goto retry; |
| 523 | } |
| 524 | |
| 525 | /* After H263 & mpeg4 header decode we have the height, width, |
| 526 | * and other parameters. So then we could init the picture. |
| 527 | * FIXME: By the way H263 decoder is evolving it should have |
| 528 | * an H263EncContext */ |
| 529 | if (s->width != avctx->coded_width || |
| 530 | s->height != avctx->coded_height || |
| 531 | s->context_reinit) { |
| 532 | /* H.263 could change picture size any time */ |
| 533 | s->context_reinit = 0; |
| 534 | |
| 535 | ret = ff_set_dimensions(avctx, s->width, s->height); |
| 536 | if (ret < 0) |
| 537 | return ret; |
| 538 | |
| 539 | ff_set_sar(avctx, avctx->sample_aspect_ratio); |
| 540 | |
| 541 | if ((ret = ff_mpv_common_frame_size_change(s))) |
| 542 | return ret; |
| 543 | } |
| 544 | |
| 545 | if (s->codec_id == AV_CODEC_ID_H263 || |
| 546 | s->codec_id == AV_CODEC_ID_H263P || |
| 547 | s->codec_id == AV_CODEC_ID_H263I) |
| 548 | s->gob_index = ff_h263_get_gob_height(s); |
| 549 | |
| 550 | // for skipping the frame |
| 551 | s->current_picture.f->pict_type = s->pict_type; |
| 552 | s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I; |
| 553 | |
| 554 | /* skip B-frames if we don't have reference frames */ |
| 555 | if (!s->last_picture_ptr && |
| 556 | (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) |
| 557 | return get_consumed_bytes(s, buf_size); |
| 558 | if ((avctx->skip_frame >= AVDISCARD_NONREF && |
| 559 | s->pict_type == AV_PICTURE_TYPE_B) || |
| 560 | (avctx->skip_frame >= AVDISCARD_NONKEY && |
| 561 | s->pict_type != AV_PICTURE_TYPE_I) || |
| 562 | avctx->skip_frame >= AVDISCARD_ALL) |
| 563 | return get_consumed_bytes(s, buf_size); |
| 564 | |
| 565 | if (s->next_p_frame_damaged) { |
| 566 | if (s->pict_type == AV_PICTURE_TYPE_B) |
| 567 | return get_consumed_bytes(s, buf_size); |
| 568 | else |
| 569 | s->next_p_frame_damaged = 0; |
| 570 | } |
| 571 | |
| 572 | if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) { |
| 573 | s->me.qpel_put = s->qdsp.put_qpel_pixels_tab; |
| 574 | s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab; |
| 575 | } else { |
| 576 | s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab; |
| 577 | s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab; |
| 578 | } |
| 579 | |
| 580 | if ((ret = ff_mpv_frame_start(s, avctx)) < 0) |
| 581 | return ret; |
| 582 | |
| 583 | if (!s->divx_packed && !avctx->hwaccel) |
| 584 | ff_thread_finish_setup(avctx); |
| 585 | |
| 586 | if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) { |
| 587 | ff_vdpau_mpeg4_decode_picture(avctx->priv_data, s->gb.buffer, s->gb.buffer_end - s->gb.buffer); |
| 588 | goto frame_end; |
| 589 | } |
| 590 | |
| 591 | if (avctx->hwaccel) { |
| 592 | ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, |
| 593 | s->gb.buffer_end - s->gb.buffer); |
| 594 | if (ret < 0 ) |
| 595 | return ret; |
| 596 | } |
| 597 | |
| 598 | ff_mpeg_er_frame_start(s); |
| 599 | |
| 600 | /* the second part of the wmv2 header contains the MB skip bits which |
| 601 | * are stored in current_picture->mb_type which is not available before |
| 602 | * ff_mpv_frame_start() */ |
| 603 | if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) { |
| 604 | ret = ff_wmv2_decode_secondary_picture_header(s); |
| 605 | if (ret < 0) |
| 606 | return ret; |
| 607 | if (ret == 1) |
| 608 | goto frame_end; |
| 609 | } |
| 610 | |
| 611 | /* decode each macroblock */ |
| 612 | s->mb_x = 0; |
| 613 | s->mb_y = 0; |
| 614 | |
| 615 | slice_ret = decode_slice(s); |
| 616 | while (s->mb_y < s->mb_height) { |
| 617 | if (s->msmpeg4_version) { |
| 618 | if (s->slice_height == 0 || s->mb_x != 0 || |
| 619 | (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0) |
| 620 | break; |
| 621 | } else { |
| 622 | int prev_x = s->mb_x, prev_y = s->mb_y; |
| 623 | if (ff_h263_resync(s) < 0) |
| 624 | break; |
| 625 | if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x) |
| 626 | s->er.error_occurred = 1; |
| 627 | } |
| 628 | |
| 629 | if (s->msmpeg4_version < 4 && s->h263_pred) |
| 630 | ff_mpeg4_clean_buffers(s); |
| 631 | |
| 632 | if (decode_slice(s) < 0) |
| 633 | slice_ret = AVERROR_INVALIDDATA; |
| 634 | } |
| 635 | |
| 636 | if (s->msmpeg4_version && s->msmpeg4_version < 4 && |
| 637 | s->pict_type == AV_PICTURE_TYPE_I) |
| 638 | if (!CONFIG_MSMPEG4_DECODER || |
| 639 | ff_msmpeg4_decode_ext_header(s, buf_size) < 0) |
| 640 | s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR; |
| 641 | |
| 642 | av_assert1(s->bitstream_buffer_size == 0); |
| 643 | frame_end: |
| 644 | ff_er_frame_end(&s->er); |
| 645 | |
| 646 | if (avctx->hwaccel) { |
| 647 | ret = avctx->hwaccel->end_frame(avctx); |
| 648 | if (ret < 0) |
| 649 | return ret; |
| 650 | } |
| 651 | |
| 652 | ff_mpv_frame_end(s); |
| 653 | |
| 654 | if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) |
| 655 | ff_mpeg4_frame_end(avctx, buf, buf_size); |
| 656 | |
| 657 | if (!s->divx_packed && avctx->hwaccel) |
| 658 | ff_thread_finish_setup(avctx); |
| 659 | |
| 660 | av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type); |
| 661 | av_assert1(s->current_picture.f->pict_type == s->pict_type); |
| 662 | if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { |
| 663 | if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0) |
| 664 | return ret; |
| 665 | ff_print_debug_info(s, s->current_picture_ptr, pict); |
| 666 | ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1); |
| 667 | } else if (s->last_picture_ptr) { |
| 668 | if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0) |
| 669 | return ret; |
| 670 | ff_print_debug_info(s, s->last_picture_ptr, pict); |
| 671 | ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1); |
| 672 | } |
| 673 | |
| 674 | if (s->last_picture_ptr || s->low_delay) { |
| 675 | if ( pict->format == AV_PIX_FMT_YUV420P |
| 676 | && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) { |
| 677 | int x, y, p; |
| 678 | av_frame_make_writable(pict); |
| 679 | for (p=0; p<3; p++) { |
| 680 | int w = FF_CEIL_RSHIFT(pict-> width, !!p); |
| 681 | int h = FF_CEIL_RSHIFT(pict->height, !!p); |
| 682 | int linesize = pict->linesize[p]; |
| 683 | for (y=0; y<(h>>1); y++) |
| 684 | for (x=0; x<w; x++) |
| 685 | FFSWAP(int, |
| 686 | pict->data[p][x + y*linesize], |
| 687 | pict->data[p][x + (h-1-y)*linesize]); |
| 688 | } |
| 689 | } |
| 690 | *got_frame = 1; |
| 691 | } |
| 692 | |
| 693 | if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) |
| 694 | return ret; |
| 695 | else |
| 696 | return get_consumed_bytes(s, buf_size); |
| 697 | } |
| 698 | |
| 699 | const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = { |
| 700 | #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL |
| 701 | AV_PIX_FMT_VAAPI_VLD, |
| 702 | #endif |
| 703 | #if CONFIG_H263_VDPAU_HWACCEL || CONFIG_MPEG4_VDPAU_HWACCEL |
| 704 | AV_PIX_FMT_VDPAU, |
| 705 | #endif |
| 706 | AV_PIX_FMT_YUV420P, |
| 707 | AV_PIX_FMT_NONE |
| 708 | }; |
| 709 | |
| 710 | AVCodec ff_h263_decoder = { |
| 711 | .name = "h263", |
| 712 | .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), |
| 713 | .type = AVMEDIA_TYPE_VIDEO, |
| 714 | .id = AV_CODEC_ID_H263, |
| 715 | .priv_data_size = sizeof(MpegEncContext), |
| 716 | .init = ff_h263_decode_init, |
| 717 | .close = ff_h263_decode_end, |
| 718 | .decode = ff_h263_decode_frame, |
| 719 | .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | |
| 720 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, |
| 721 | .flush = ff_mpeg_flush, |
| 722 | .max_lowres = 3, |
| 723 | .pix_fmts = ff_h263_hwaccel_pixfmt_list_420, |
| 724 | }; |
| 725 | |
| 726 | AVCodec ff_h263p_decoder = { |
| 727 | .name = "h263p", |
| 728 | .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), |
| 729 | .type = AVMEDIA_TYPE_VIDEO, |
| 730 | .id = AV_CODEC_ID_H263P, |
| 731 | .priv_data_size = sizeof(MpegEncContext), |
| 732 | .init = ff_h263_decode_init, |
| 733 | .close = ff_h263_decode_end, |
| 734 | .decode = ff_h263_decode_frame, |
| 735 | .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | |
| 736 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, |
| 737 | .flush = ff_mpeg_flush, |
| 738 | .max_lowres = 3, |
| 739 | .pix_fmts = ff_h263_hwaccel_pixfmt_list_420, |
| 740 | }; |