gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c

   1 /*
   2  *  gstvaapidecoder_mpeg2.c - MPEG-2 decoder
   3  *
   4  *  Copyright (C) 2011 Intel Corporation
   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 License
   8  *  as published by the Free Software Foundation; either version 2.1
   9  *  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
  18  *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  *  Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * SECTION:gstvaapidecoder_mpeg2
  24  * @short_description: MPEG-2 decoder
  25  */
  26
  27 #include "sysdeps.h"
  28 #include <string.h>
  29 #include <gst/base/gstbitreader.h>
  30 #include <gst/codecparsers/gstmpegvideoparser.h>
  31 #include "gstvaapidecoder_mpeg2.h"
  32 #include "gstvaapidecoder_objects.h"
  33 #include "gstvaapidecoder_dpb.h"
  34 #include "gstvaapidecoder_priv.h"
  35 #include "gstvaapidisplay_priv.h"
  36 #include "gstvaapiobject_priv.h"
  37
  38 #define DEBUG 1
  39 #include "gstvaapidebug.h"
  40
  41 G_DEFINE_TYPE(GstVaapiDecoderMpeg2,
  42               gst_vaapi_decoder_mpeg2,
  43               GST_VAAPI_TYPE_DECODER);
  44
  45 #define GST_VAAPI_DECODER_MPEG2_GET_PRIVATE(obj)                \
  46     (G_TYPE_INSTANCE_GET_PRIVATE((obj),                         \
  47                                  GST_VAAPI_TYPE_DECODER_MPEG2,  \
  48                                  GstVaapiDecoderMpeg2Private))
  49
  50 #define READ_UINT8(br, val, nbits) G_STMT_START {  \
  51   if (!gst_bit_reader_get_bits_uint8 (br, &val, nbits)) { \
  52     GST_WARNING ("failed to read uint8, nbits: %d", nbits); \
  53     goto failed; \
  54   } \
  55 } G_STMT_END
  56
  57 #define SKIP(reader, nbits) G_STMT_START { \
  58   if (!gst_bit_reader_skip (reader, nbits)) { \
  59     GST_WARNING ("failed to skip nbits: %d", nbits); \
  60     goto failed; \
  61   } \
  62 } G_STMT_END
  63
  64 /* PTS Generator */
  65 typedef struct _PTSGenerator PTSGenerator;
  66 struct _PTSGenerator {
  67     GstClockTime        gop_pts; // Current GOP PTS
  68     GstClockTime        max_pts; // Max picture PTS
  69     guint               gop_tsn; // Absolute GOP TSN
  70     guint               max_tsn; // Max picture TSN, relative to last GOP TSN
  71     guint               ovl_tsn; // How many times TSN overflowed since GOP
  72     guint               lst_tsn; // Last picture TSN
  73     guint               fps_n;
  74     guint               fps_d;
  75 };
  76
  77 static void
  78 pts_init(PTSGenerator *tsg)
  79 {
  80     tsg->gop_pts = GST_CLOCK_TIME_NONE;
  81     tsg->max_pts = GST_CLOCK_TIME_NONE;
  82     tsg->gop_tsn = 0;
  83     tsg->max_tsn = 0;
  84     tsg->ovl_tsn = 0;
  85     tsg->lst_tsn = 0;
  86     tsg->fps_n   = 0;
  87     tsg->fps_d   = 0;
  88 }
  89
  90 static inline GstClockTime
  91 pts_get_duration(PTSGenerator *tsg, guint num_frames)
  92 {
  93     return gst_util_uint64_scale(num_frames,
  94                                  GST_SECOND * tsg->fps_d, tsg->fps_n);
  95 }
  96
  97 static inline guint
  98 pts_get_poc(PTSGenerator *tsg)
  99 {
 100     return tsg->gop_tsn + tsg->ovl_tsn * 1024 + tsg->lst_tsn;
 101 }
 102
 103 static void
 104 pts_set_framerate(PTSGenerator *tsg, guint fps_n, guint fps_d)
 105 {
 106     tsg->fps_n = fps_n;
 107     tsg->fps_d = fps_d;
 108 }
 109
 110 static void
 111 pts_sync(PTSGenerator *tsg, GstClockTime gop_pts)
 112 {
 113     guint gop_tsn;
 114
 115     if (!GST_CLOCK_TIME_IS_VALID(gop_pts) ||
 116         (GST_CLOCK_TIME_IS_VALID(tsg->max_pts) && tsg->max_pts >= gop_pts)) {
 117         /* Invalid GOP PTS, interpolate from the last known picture PTS */
 118         if (GST_CLOCK_TIME_IS_VALID(tsg->max_pts)) {
 119             gop_pts = tsg->max_pts + pts_get_duration(tsg, 1);
 120             gop_tsn = tsg->gop_tsn + tsg->ovl_tsn * 1024 + tsg->max_tsn + 1;
 121         }
 122         else {
 123             gop_pts = 0;
 124             gop_tsn = 0;
 125         }
 126     }
 127     else {
 128         /* Interpolate GOP TSN from this valid PTS */
 129         if (GST_CLOCK_TIME_IS_VALID(tsg->gop_pts))
 130             gop_tsn = tsg->gop_tsn + gst_util_uint64_scale(
 131                 gop_pts - tsg->gop_pts + pts_get_duration(tsg, 1) - 1,
 132                 tsg->fps_n, GST_SECOND * tsg->fps_d);
 133         else
 134             gop_tsn = 0;
 135     }
 136
 137     tsg->gop_pts = gop_pts;
 138     tsg->gop_tsn = gop_tsn;
 139     tsg->max_tsn = 0;
 140     tsg->ovl_tsn = 0;
 141     tsg->lst_tsn = 0;
 142 }
 143
 144 static GstClockTime
 145 pts_eval(PTSGenerator *tsg, GstClockTime pic_pts, guint pic_tsn)
 146 {
 147     GstClockTime pts;
 148
 149     if (!GST_CLOCK_TIME_IS_VALID(tsg->gop_pts))
 150         tsg->gop_pts = 0;
 151
 152     pts = tsg->gop_pts + pts_get_duration(tsg, tsg->ovl_tsn * 1024 + pic_tsn);
 153
 154     if (!GST_CLOCK_TIME_IS_VALID(tsg->max_pts) || tsg->max_pts < pts)
 155         tsg->max_pts = pts;
 156
 157     if (tsg->max_tsn < pic_tsn)
 158         tsg->max_tsn = pic_tsn;
 159     else if (tsg->max_tsn == 1023 && pic_tsn < tsg->lst_tsn) { /* TSN wrapped */
 160         tsg->max_tsn = pic_tsn;
 161         tsg->ovl_tsn++;
 162     }
 163     tsg->lst_tsn = pic_tsn;
 164     return pts;
 165 }
 166
 167 struct _GstVaapiDecoderMpeg2Private {
 168     GstVaapiProfile             profile;
 169     GstVaapiProfile             hw_profile;
 170     guint                       width;
 171     guint                       height;
 172     guint                       fps_n;
 173     guint                       fps_d;
 174     GstMpegVideoSequenceHdr     seq_hdr;
 175     GstMpegVideoSequenceExt     seq_ext;
 176     GstMpegVideoPictureHdr      pic_hdr;
 177     GstMpegVideoPictureExt      pic_ext;
 178     GstMpegVideoQuantMatrixExt  quant_matrix_ext;
 179     GstVaapiPicture            *current_picture;
 180     GstVaapiDpb                *dpb;
 181     GstAdapter                 *adapter;
 182     PTSGenerator                tsg;
 183     guint                       is_constructed          : 1;
 184     guint                       is_opened               : 1;
 185     guint                       has_seq_ext             : 1;
 186     guint                       has_seq_scalable_ext    : 1;
 187     guint                       has_pic_ext             : 1;
 188     guint                       has_quant_matrix_ext    : 1;
 189     guint                       size_changed            : 1;
 190     guint                       profile_changed         : 1;
 191     guint                       quant_matrix_changed    : 1;
 192     guint                       progressive_sequence    : 1;
 193     guint                       closed_gop              : 1;
 194     guint                       broken_link             : 1;
 195 };
 196
 197 /* VLC decoder from gst-plugins-bad */
 198 typedef struct _VLCTable VLCTable;
 199 struct _VLCTable {
 200     gint  value;
 201     guint cword;
 202     guint cbits;
 203 };
 204
 205 static gboolean
 206 decode_vlc(GstBitReader *br, gint *res, const VLCTable *table, guint length)
 207 {
 208     guint8 i;
 209     guint cbits = 0;
 210     guint32 value = 0;
 211
 212     for (i = 0; i < length; i++) {
 213         if (cbits != table[i].cbits) {
 214             cbits = table[i].cbits;
 215             if (!gst_bit_reader_peek_bits_uint32(br, &value, cbits)) {
 216                 goto failed;
 217             }
 218         }
 219
 220         if (value == table[i].cword) {
 221             SKIP(br, cbits);
 222             if (res)
 223                 *res = table[i].value;
 224             return TRUE;
 225         }
 226     }
 227     GST_DEBUG("failed to find VLC code");
 228
 229 failed:
 230     GST_WARNING("failed to decode VLC, returning");
 231     return FALSE;
 232 }
 233
 234 enum {
 235     GST_MPEG_VIDEO_MACROBLOCK_ESCAPE = -1,
 236 };
 237
 238 /* Table B-1: Variable length codes for macroblock_address_increment */
 239 static const VLCTable mpeg2_mbaddr_vlc_table[] = {
 240     {  1, 0x01,  1 },
 241     {  2, 0x03,  3 },
 242     {  3, 0x02,  3 },
 243     {  4, 0x03,  4 },
 244     {  5, 0x02,  4 },
 245     {  6, 0x03,  5 },
 246     {  7, 0x02,  5 },
 247     {  8, 0x07,  7 },
 248     {  9, 0x06,  7 },
 249     { 10, 0x0b,  8 },
 250     { 11, 0x0a,  8 },
 251     { 12, 0x09,  8 },
 252     { 13, 0x08,  8 },
 253     { 14, 0x07,  8 },
 254     { 15, 0x06,  8 },
 255     { 16, 0x17, 10 },
 256     { 17, 0x16, 10 },
 257     { 18, 0x15, 10 },
 258     { 19, 0x14, 10 },
 259     { 20, 0x13, 10 },
 260     { 21, 0x12, 10 },
 261     { 22, 0x23, 11 },
 262     { 23, 0x22, 11 },
 263     { 24, 0x21, 11 },
 264     { 25, 0x20, 11 },
 265     { 26, 0x1f, 11 },
 266     { 27, 0x1e, 11 },
 267     { 28, 0x1d, 11 },
 268     { 29, 0x1c, 11 },
 269     { 30, 0x1b, 11 },
 270     { 31, 0x1a, 11 },
 271     { 32, 0x19, 11 },
 272     { 33, 0x18, 11 },
 273     { GST_MPEG_VIDEO_MACROBLOCK_ESCAPE, 0x08, 11 }
 274 };
 275
 276 static void
 277 gst_vaapi_decoder_mpeg2_clear_buffer(GstVaapiDecoder *base)
 278 {
 279     GstVaapiDecoderMpeg2* const decoder = GST_VAAPI_DECODER_MPEG2(base);
 280     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 281
 282     priv->closed_gop            = FALSE;
 283     priv->broken_link           = FALSE;
 284
 285     gst_vaapi_picture_replace(&priv->current_picture, NULL);
 286
 287     pts_init(&priv->tsg);
 288     pts_set_framerate(&priv->tsg, priv->fps_n, priv->fps_d);
 289
 290     if (priv->dpb) {
 291         gst_vaapi_dpb_flush(priv->dpb);
 292     }
 293
 294     if (priv->adapter) {
 295         gst_adapter_clear(priv->adapter);
 296     }
 297 }
 298
 299 static void
 300 gst_vaapi_decoder_mpeg2_close(GstVaapiDecoderMpeg2 *decoder)
 301 {
 302     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 303
 304     gst_vaapi_picture_replace(&priv->current_picture, NULL);
 305
 306     if (priv->dpb) {
 307         gst_vaapi_dpb_unref(priv->dpb);
 308         priv->dpb = NULL;
 309     }
 310
 311     if (priv->adapter) {
 312         gst_adapter_clear(priv->adapter);
 313         g_object_unref(priv->adapter);
 314         priv->adapter = NULL;
 315     }
 316 }
 317
 318 static gboolean
 319 gst_vaapi_decoder_mpeg2_open(GstVaapiDecoderMpeg2 *decoder, GstBuffer *buffer)
 320 {
 321     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 322
 323     gst_vaapi_decoder_mpeg2_close(decoder);
 324
 325     priv->adapter = gst_adapter_new();
 326     if (!priv->adapter)
 327         return FALSE;
 328
 329     priv->dpb = gst_vaapi_dpb_mpeg2_new();
 330     if (!priv->dpb)
 331         return FALSE;
 332
 333     pts_init(&priv->tsg);
 334     return TRUE;
 335 }
 336
 337 static void
 338 gst_vaapi_decoder_mpeg2_destroy(GstVaapiDecoderMpeg2 *decoder)
 339 {
 340     gst_vaapi_decoder_mpeg2_close(decoder);
 341 }
 342
 343 static gboolean
 344 gst_vaapi_decoder_mpeg2_create(GstVaapiDecoderMpeg2 *decoder)
 345 {
 346     if (!GST_VAAPI_DECODER_CODEC(decoder))
 347         return FALSE;
 348     return TRUE;
 349 }
 350
 351 static inline void
 352 copy_quant_matrix(guint8 dst[64], const guint8 src[64])
 353 {
 354     memcpy(dst, src, 64);
 355 }
 356
 357 static const char *
 358 get_profile_str(GstVaapiProfile profile)
 359 {
 360     char *str;
 361
 362     switch (profile) {
 363     case GST_VAAPI_PROFILE_MPEG2_SIMPLE:    str = "simple";     break;
 364     case GST_VAAPI_PROFILE_MPEG2_MAIN:      str = "main";       break;
 365     case GST_VAAPI_PROFILE_MPEG2_HIGH:      str = "high";       break;
 366     default:                                str = "<unknown>";  break;
 367     }
 368     return str;
 369 }
 370
 371 static GstVaapiProfile
 372 get_profile(GstVaapiDecoderMpeg2 *decoder, GstVaapiEntrypoint entrypoint)
 373 {
 374     GstVaapiDisplay * const va_display = GST_VAAPI_DECODER_DISPLAY(decoder);
 375     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 376     GstVaapiProfile profile = priv->profile;
 377
 378     do {
 379         /* Return immediately if the exact same profile was found */
 380         if (gst_vaapi_display_has_decoder(va_display, profile, entrypoint))
 381             break;
 382
 383         /* Otherwise, try to map to a higher profile */
 384         switch (profile) {
 385         case GST_VAAPI_PROFILE_MPEG2_SIMPLE:
 386             profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
 387             break;
 388         case GST_VAAPI_PROFILE_MPEG2_MAIN:
 389             profile = GST_VAAPI_PROFILE_MPEG2_HIGH;
 390             break;
 391         case GST_VAAPI_PROFILE_MPEG2_HIGH:
 392             // Try to map to main profile if no high profile specific bits used
 393             if (priv->profile == profile    &&
 394                 !priv->has_seq_scalable_ext &&
 395                 (priv->has_seq_ext && priv->seq_ext.chroma_format == 1)) {
 396                 profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
 397                 break;
 398             }
 399             // fall-through
 400         default:
 401             profile = GST_VAAPI_PROFILE_UNKNOWN;
 402             break;
 403         }
 404     } while (profile != GST_VAAPI_PROFILE_UNKNOWN);
 405
 406     if (profile != priv->profile)
 407         GST_INFO("forced %s profile to %s profile",
 408                  get_profile_str(priv->profile), get_profile_str(profile));
 409     return profile;
 410 }
 411
 412 static GstVaapiDecoderStatus
 413 ensure_context(GstVaapiDecoderMpeg2 *decoder)
 414 {
 415     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 416     GstVaapiEntrypoint entrypoint = GST_VAAPI_ENTRYPOINT_VLD;
 417     gboolean reset_context = FALSE;
 418
 419     if (priv->profile_changed) {
 420         GST_DEBUG("profile changed");
 421         priv->profile_changed = FALSE;
 422         reset_context         = TRUE;
 423
 424         priv->hw_profile = get_profile(decoder, entrypoint);
 425         if (priv->hw_profile == GST_VAAPI_PROFILE_UNKNOWN)
 426             return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
 427     }
 428
 429     if (priv->size_changed) {
 430         GST_DEBUG("size changed");
 431         priv->size_changed = FALSE;
 432         reset_context      = TRUE;
 433     }
 434
 435     if (reset_context) {
 436         reset_context = gst_vaapi_decoder_ensure_context(
 437             GST_VAAPI_DECODER(decoder),
 438             priv->hw_profile,
 439             entrypoint,
 440             priv->width,
 441             priv->height,
 442             GST_DECODER_DEFAULT_SURFACES_COUNT
 443         );
 444         if (!reset_context)
 445             return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 446     }
 447     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 448 }
 449
 450 static GstVaapiDecoderStatus
 451 ensure_quant_matrix(GstVaapiDecoderMpeg2 *decoder, GstVaapiPicture *picture)
 452 {
 453     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 454     VAIQMatrixBufferMPEG2 *iq_matrix;
 455     guint8 *intra_quant_matrix = NULL;
 456     guint8 *non_intra_quant_matrix = NULL;
 457     guint8 *chroma_intra_quant_matrix = NULL;
 458     guint8 *chroma_non_intra_quant_matrix = NULL;
 459
 460     if (!priv->quant_matrix_changed)
 461         return GST_VAAPI_DECODER_STATUS_SUCCESS;
 462
 463     priv->quant_matrix_changed = FALSE;
 464
 465     picture->iq_matrix = GST_VAAPI_IQ_MATRIX_NEW(MPEG2, decoder);
 466     if (!picture->iq_matrix) {
 467         GST_ERROR("failed to allocate IQ matrix");
 468         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 469     }
 470     iq_matrix = picture->iq_matrix->param;
 471
 472     intra_quant_matrix     = priv->seq_hdr.intra_quantizer_matrix;
 473     non_intra_quant_matrix = priv->seq_hdr.non_intra_quantizer_matrix;
 474     if (priv->has_quant_matrix_ext) {
 475         if (priv->quant_matrix_ext.load_intra_quantiser_matrix)
 476             intra_quant_matrix = priv->quant_matrix_ext.intra_quantiser_matrix;
 477         if (priv->quant_matrix_ext.load_non_intra_quantiser_matrix)
 478             non_intra_quant_matrix = priv->quant_matrix_ext.non_intra_quantiser_matrix;
 479         if (priv->quant_matrix_ext.load_chroma_intra_quantiser_matrix)
 480             chroma_intra_quant_matrix = priv->quant_matrix_ext.chroma_intra_quantiser_matrix;
 481         if (priv->quant_matrix_ext.load_chroma_non_intra_quantiser_matrix)
 482             chroma_non_intra_quant_matrix = priv->quant_matrix_ext.chroma_non_intra_quantiser_matrix;
 483     }
 484
 485     iq_matrix->load_intra_quantiser_matrix = intra_quant_matrix != NULL;
 486     if (intra_quant_matrix)
 487         copy_quant_matrix(iq_matrix->intra_quantiser_matrix,
 488                           intra_quant_matrix);
 489
 490     iq_matrix->load_non_intra_quantiser_matrix = non_intra_quant_matrix != NULL;
 491     if (non_intra_quant_matrix)
 492         copy_quant_matrix(iq_matrix->non_intra_quantiser_matrix,
 493                           non_intra_quant_matrix);
 494
 495     iq_matrix->load_chroma_intra_quantiser_matrix = chroma_intra_quant_matrix != NULL;
 496     if (chroma_intra_quant_matrix)
 497         copy_quant_matrix(iq_matrix->chroma_intra_quantiser_matrix,
 498                           chroma_intra_quant_matrix);
 499
 500     iq_matrix->load_chroma_non_intra_quantiser_matrix = chroma_non_intra_quant_matrix != NULL;
 501     if (chroma_non_intra_quant_matrix)
 502         copy_quant_matrix(iq_matrix->chroma_non_intra_quantiser_matrix,
 503                           chroma_non_intra_quant_matrix);
 504     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 505 }
 506
 507 static gboolean
 508 decode_current_picture(GstVaapiDecoderMpeg2 *decoder)
 509 {
 510     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 511     GstVaapiPicture * const picture = priv->current_picture;
 512
 513     if (picture) {
 514         if (!gst_vaapi_picture_decode(picture))
 515             return FALSE;
 516         if (GST_VAAPI_PICTURE_IS_COMPLETE(picture)) {
 517             if (!gst_vaapi_dpb_add(priv->dpb, picture))
 518                 return FALSE;
 519             gst_vaapi_picture_replace(&priv->current_picture, NULL);
 520         }
 521     }
 522     return TRUE;
 523 }
 524
 525 static GstVaapiDecoderStatus
 526 decode_sequence(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
 527 {
 528     GstVaapiDecoder * const base_decoder = GST_VAAPI_DECODER(decoder);
 529     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 530     GstMpegVideoSequenceHdr * const seq_hdr = &priv->seq_hdr;
 531
 532     if (!gst_mpeg_video_parse_sequence_header(seq_hdr, buf, buf_size, 4)) {
 533         GST_ERROR("failed to parse sequence header");
 534         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 535     }
 536
 537     priv->fps_n = seq_hdr->fps_n;
 538     priv->fps_d = seq_hdr->fps_d;
 539     pts_set_framerate(&priv->tsg, priv->fps_n, priv->fps_d);
 540     gst_vaapi_decoder_set_framerate(base_decoder, priv->fps_n, priv->fps_d);
 541
 542     priv->width                 = seq_hdr->width;
 543     priv->height                = seq_hdr->height;
 544     priv->has_seq_ext           = FALSE;
 545     priv->size_changed          = TRUE;
 546     priv->quant_matrix_changed  = TRUE;
 547     priv->progressive_sequence  = TRUE;
 548     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 549 }
 550
 551 static GstVaapiDecoderStatus
 552 decode_sequence_ext(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
 553 {
 554     GstVaapiDecoder * const base_decoder = GST_VAAPI_DECODER(decoder);
 555     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 556     GstMpegVideoSequenceExt * const seq_ext = &priv->seq_ext;
 557     GstVaapiProfile profile;
 558     guint width, height;
 559
 560     if (!gst_mpeg_video_parse_sequence_extension(seq_ext, buf, buf_size, 4)) {
 561         GST_ERROR("failed to parse sequence-extension");
 562         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 563     }
 564     priv->has_seq_ext = TRUE;
 565     priv->progressive_sequence = seq_ext->progressive;
 566     gst_vaapi_decoder_set_interlaced(base_decoder, !priv->progressive_sequence);
 567
 568     width  = (priv->width  & 0x0fff) | ((guint32)seq_ext->horiz_size_ext << 12);
 569     height = (priv->height & 0x0fff) | ((guint32)seq_ext->vert_size_ext  << 12);
 570     GST_DEBUG("video resolution %ux%u", width, height);
 571
 572     if (seq_ext->fps_n_ext && seq_ext->fps_d_ext) {
 573         priv->fps_n *= seq_ext->fps_n_ext + 1;
 574         priv->fps_d *= seq_ext->fps_d_ext + 1;
 575         pts_set_framerate(&priv->tsg, priv->fps_n, priv->fps_d);
 576         gst_vaapi_decoder_set_framerate(base_decoder, priv->fps_n, priv->fps_d);
 577     }
 578
 579     if (priv->width != width) {
 580         priv->width = width;
 581         priv->size_changed = TRUE;
 582     }
 583
 584     if (priv->height != height) {
 585         priv->height = height;
 586         priv->size_changed = TRUE;
 587     }
 588
 589     switch (seq_ext->profile) {
 590     case GST_MPEG_VIDEO_PROFILE_SIMPLE:
 591         profile = GST_VAAPI_PROFILE_MPEG2_SIMPLE;
 592         break;
 593     case GST_MPEG_VIDEO_PROFILE_MAIN:
 594         profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
 595         break;
 596     case GST_MPEG_VIDEO_PROFILE_HIGH:
 597         profile = GST_VAAPI_PROFILE_MPEG2_HIGH;
 598         break;
 599     default:
 600         GST_ERROR("unsupported profile %d", seq_ext->profile);
 601         return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
 602     }
 603     if (priv->profile != profile) {
 604         priv->profile = profile;
 605         priv->profile_changed = TRUE;
 606     }
 607     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 608 }
 609
 610 static GstVaapiDecoderStatus
 611 decode_sequence_end(GstVaapiDecoderMpeg2 *decoder)
 612 {
 613     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 614
 615     if (priv->current_picture && !decode_current_picture(decoder))
 616         return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 617
 618     gst_vaapi_dpb_flush(priv->dpb);
 619     return GST_VAAPI_DECODER_STATUS_END_OF_STREAM;
 620 }
 621
 622 static GstVaapiDecoderStatus
 623 decode_quant_matrix_ext(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
 624 {
 625     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 626     GstMpegVideoQuantMatrixExt * const quant_matrix_ext = &priv->quant_matrix_ext;
 627
 628     if (!gst_mpeg_video_parse_quant_matrix_extension(quant_matrix_ext, buf, buf_size, 4)) {
 629         GST_ERROR("failed to parse quant-matrix-extension");
 630         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 631     }
 632     priv->has_quant_matrix_ext = TRUE;
 633     priv->quant_matrix_changed = TRUE;
 634     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 635 }
 636
 637 static GstVaapiDecoderStatus
 638 decode_gop(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
 639 {
 640     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 641     GstMpegVideoGop gop;
 642     GstClockTime pts;
 643
 644     if (!gst_mpeg_video_parse_gop(&gop, buf, buf_size, 4)) {
 645         GST_ERROR("failed to parse GOP");
 646         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 647     }
 648
 649     priv->closed_gop  = gop.closed_gop;
 650     priv->broken_link = gop.broken_link;
 651
 652     GST_DEBUG("GOP %02u:%02u:%02u:%02u (closed_gop %d, broken_link %d)",
 653               gop.hour, gop.minute, gop.second, gop.frame,
 654               priv->closed_gop, priv->broken_link);
 655
 656     pts = gst_adapter_prev_timestamp(priv->adapter, NULL);
 657     pts_sync(&priv->tsg, pts);
 658     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 659 }
 660
 661 static GstVaapiDecoderStatus
 662 decode_picture(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
 663 {
 664     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 665     GstMpegVideoPictureHdr * const pic_hdr = &priv->pic_hdr;
 666     GstVaapiPicture *picture;
 667     GstVaapiDecoderStatus status;
 668     GstClockTime pts;
 669
 670     status = ensure_context(decoder);
 671     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
 672         GST_ERROR("failed to reset context");
 673         return status;
 674     }
 675
 676     if (priv->current_picture && !decode_current_picture(decoder))
 677         return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 678
 679     if (priv->current_picture) {
 680         /* Re-use current picture where the first field was decoded */
 681         picture = gst_vaapi_picture_new_field(priv->current_picture);
 682         if (!picture) {
 683             GST_ERROR("failed to allocate field picture");
 684             return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 685         }
 686     }
 687     else {
 688         /* Create new picture */
 689         picture = GST_VAAPI_PICTURE_NEW(MPEG2, decoder);
 690         if (!picture) {
 691             GST_ERROR("failed to allocate picture");
 692             return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 693         }
 694     }
 695     gst_vaapi_picture_replace(&priv->current_picture, picture);
 696     gst_vaapi_picture_unref(picture);
 697
 698     status = ensure_quant_matrix(decoder, picture);
 699     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
 700         GST_ERROR("failed to reset quantizer matrix");
 701         return status;
 702     }
 703
 704     if (!gst_mpeg_video_parse_picture_header(pic_hdr, buf, buf_size, 4)) {
 705         GST_ERROR("failed to parse picture header");
 706         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 707     }
 708     priv->has_pic_ext = FALSE;
 709
 710     switch (pic_hdr->pic_type) {
 711     case GST_MPEG_VIDEO_PICTURE_TYPE_I:
 712         GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
 713         picture->type = GST_VAAPI_PICTURE_TYPE_I;
 714         break;
 715     case GST_MPEG_VIDEO_PICTURE_TYPE_P:
 716         GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
 717         picture->type = GST_VAAPI_PICTURE_TYPE_P;
 718         break;
 719     case GST_MPEG_VIDEO_PICTURE_TYPE_B:
 720         picture->type = GST_VAAPI_PICTURE_TYPE_B;
 721         break;
 722     default:
 723         GST_ERROR("unsupported picture type %d", pic_hdr->pic_type);
 724         return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 725     }
 726
 727     /* Update presentation time */
 728     pts = gst_adapter_prev_timestamp(priv->adapter, NULL);
 729     picture->pts = pts_eval(&priv->tsg, pts, pic_hdr->tsn);
 730     picture->poc = pts_get_poc(&priv->tsg);
 731     return status;
 732 }
 733
 734 static GstVaapiDecoderStatus
 735 decode_picture_ext(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
 736 {
 737     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 738     GstMpegVideoPictureExt * const pic_ext = &priv->pic_ext;
 739     GstVaapiPicture * const picture = priv->current_picture;
 740
 741     if (!gst_mpeg_video_parse_picture_extension(pic_ext, buf, buf_size, 4)) {
 742         GST_ERROR("failed to parse picture-extension");
 743         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 744     }
 745     priv->has_pic_ext = TRUE;
 746
 747     if (priv->progressive_sequence && !pic_ext->progressive_frame) {
 748         GST_WARNING("invalid interlaced frame in progressive sequence, fixing");
 749         pic_ext->progressive_frame = 1;
 750     }
 751
 752     if (pic_ext->picture_structure == 0 ||
 753         (pic_ext->progressive_frame &&
 754          pic_ext->picture_structure != GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME)) {
 755         GST_WARNING("invalid picture_structure %d, replacing with \"frame\"",
 756                     pic_ext->picture_structure);
 757         pic_ext->picture_structure = GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME;
 758     }
 759
 760     if (!priv->progressive_sequence && !pic_ext->progressive_frame) {
 761         GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_INTERLACED);
 762         if (pic_ext->top_field_first)
 763             GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_TFF);
 764     }
 765
 766     switch (pic_ext->picture_structure) {
 767     case GST_MPEG_VIDEO_PICTURE_STRUCTURE_TOP_FIELD:
 768         picture->structure = GST_VAAPI_PICTURE_STRUCTURE_TOP_FIELD;
 769         break;
 770     case GST_MPEG_VIDEO_PICTURE_STRUCTURE_BOTTOM_FIELD:
 771         picture->structure = GST_VAAPI_PICTURE_STRUCTURE_BOTTOM_FIELD;
 772         break;
 773     case GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME:
 774         picture->structure = GST_VAAPI_PICTURE_STRUCTURE_FRAME;
 775         break;
 776     }
 777
 778     /* Allocate dummy picture for first field based I-frame */
 779     if (picture->type == GST_VAAPI_PICTURE_TYPE_I &&
 780         !GST_VAAPI_PICTURE_IS_FRAME(picture) &&
 781         gst_vaapi_dpb_size(priv->dpb) == 0) {
 782         GstVaapiPicture *dummy_picture;
 783         gboolean success;
 784
 785         dummy_picture = GST_VAAPI_PICTURE_NEW(MPEG2, decoder);
 786         if (!dummy_picture) {
 787             GST_ERROR("failed to allocate dummy picture");
 788             return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 789         }
 790
 791         dummy_picture->type      = GST_VAAPI_PICTURE_TYPE_I;
 792         dummy_picture->pts       = GST_CLOCK_TIME_NONE;
 793         dummy_picture->poc       = -1;
 794         dummy_picture->structure = GST_VAAPI_PICTURE_STRUCTURE_FRAME;
 795
 796         GST_VAAPI_PICTURE_FLAG_SET(
 797             dummy_picture,
 798             (GST_VAAPI_PICTURE_FLAG_SKIPPED |
 799              GST_VAAPI_PICTURE_FLAG_REFERENCE)
 800         );
 801
 802         success = gst_vaapi_dpb_add(priv->dpb, dummy_picture);
 803         gst_vaapi_picture_unref(dummy_picture);
 804         if (!success) {
 805             GST_ERROR("failed to add dummy picture into DPB");
 806             return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 807         }
 808         GST_INFO("allocated dummy picture for first field based I-frame");
 809     }
 810     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 811 }
 812
 813 static inline guint32
 814 pack_f_code(guint8 f_code[2][2])
 815 {
 816     return (((guint32)f_code[0][0] << 12) |
 817             ((guint32)f_code[0][1] <<  8) |
 818             ((guint32)f_code[1][0] <<  4) |
 819             (         f_code[1][1]      ));
 820 }
 821
 822 static gboolean
 823 fill_picture(GstVaapiDecoderMpeg2 *decoder, GstVaapiPicture *picture)
 824 {
 825     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 826     VAPictureParameterBufferMPEG2 * const pic_param = picture->param;
 827     GstMpegVideoPictureHdr * const pic_hdr = &priv->pic_hdr;
 828     GstMpegVideoPictureExt * const pic_ext = &priv->pic_ext;
 829     GstVaapiPicture *prev_picture, *next_picture;
 830
 831     if (!priv->has_pic_ext)
 832         return FALSE;
 833
 834     /* Fill in VAPictureParameterBufferMPEG2 */
 835     pic_param->horizontal_size                                          = priv->width;
 836     pic_param->vertical_size                                            = priv->height;
 837     pic_param->forward_reference_picture                                = VA_INVALID_ID;
 838     pic_param->backward_reference_picture                               = VA_INVALID_ID;
 839     pic_param->picture_coding_type                                      = pic_hdr->pic_type;
 840     pic_param->f_code                                                   = pack_f_code(pic_ext->f_code);
 841
 842 #define COPY_FIELD(a, b, f) \
 843     pic_param->a.b.f = pic_ext->f
 844     pic_param->picture_coding_extension.value                           = 0;
 845     pic_param->picture_coding_extension.bits.is_first_field             = GST_VAAPI_PICTURE_IS_FIRST_FIELD(picture);
 846     COPY_FIELD(picture_coding_extension, bits, intra_dc_precision);
 847     COPY_FIELD(picture_coding_extension, bits, picture_structure);
 848     COPY_FIELD(picture_coding_extension, bits, top_field_first);
 849     COPY_FIELD(picture_coding_extension, bits, frame_pred_frame_dct);
 850     COPY_FIELD(picture_coding_extension, bits, concealment_motion_vectors);
 851     COPY_FIELD(picture_coding_extension, bits, q_scale_type);
 852     COPY_FIELD(picture_coding_extension, bits, intra_vlc_format);
 853     COPY_FIELD(picture_coding_extension, bits, alternate_scan);
 854     COPY_FIELD(picture_coding_extension, bits, repeat_first_field);
 855     COPY_FIELD(picture_coding_extension, bits, progressive_frame);
 856
 857     gst_vaapi_dpb_mpeg2_get_references(
 858         priv->dpb,
 859         picture,
 860         &prev_picture,
 861         &next_picture
 862     );
 863
 864     switch (pic_hdr->pic_type) {
 865     case GST_MPEG_VIDEO_PICTURE_TYPE_B:
 866         if (next_picture)
 867             pic_param->backward_reference_picture = next_picture->surface_id;
 868         if (prev_picture)
 869             pic_param->forward_reference_picture = prev_picture->surface_id;
 870         else if (!priv->closed_gop)
 871             GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_SKIPPED);
 872         break;
 873     case GST_MPEG_VIDEO_PICTURE_TYPE_P:
 874         if (prev_picture)
 875             pic_param->forward_reference_picture = prev_picture->surface_id;
 876         break;
 877     }
 878     return TRUE;
 879 }
 880
 881 static GstVaapiDecoderStatus
 882 decode_slice(
 883     GstVaapiDecoderMpeg2 *decoder,
 884     int                   slice_no,
 885     guchar               *buf,
 886     guint                 buf_size
 887 )
 888 {
 889     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 890     GstVaapiPicture * const picture = priv->current_picture;
 891     GstVaapiSlice *slice;
 892     VASliceParameterBufferMPEG2 *slice_param;
 893     GstBitReader br;
 894     gint mb_x, mb_y, mb_inc;
 895     guint macroblock_offset;
 896     guint8 slice_vertical_position_extension;
 897     guint8 quantiser_scale_code;
 898     guint8 intra_slice = 0;
 899     guint8 extra_bit_slice, junk8;
 900
 901     GST_DEBUG("slice %d @ %p, %u bytes)", slice_no, buf, buf_size);
 902
 903     if (picture->slices->len == 0 && !fill_picture(decoder, picture))
 904         return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 905
 906     slice = GST_VAAPI_SLICE_NEW(MPEG2, decoder, buf, buf_size);
 907     if (!slice) {
 908         GST_ERROR("failed to allocate slice");
 909         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 910     }
 911     gst_vaapi_picture_add_slice(picture, slice);
 912
 913     /* Parse slice */
 914     gst_bit_reader_init(&br, buf, buf_size);
 915     SKIP(&br, 32); /* slice_start_code */
 916     if (priv->height > 2800)
 917         READ_UINT8(&br, slice_vertical_position_extension, 3);
 918     if (priv->has_seq_scalable_ext) {
 919         GST_ERROR("failed to parse slice %d. Unsupported sequence_scalable_extension()", slice_no);
 920         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 921     }
 922     READ_UINT8(&br, quantiser_scale_code, 5);
 923     READ_UINT8(&br, extra_bit_slice, 1);
 924     if (extra_bit_slice == 1) {
 925         READ_UINT8(&br, intra_slice, 1);
 926         READ_UINT8(&br, junk8, 7);
 927         READ_UINT8(&br, extra_bit_slice, 1);
 928         while (extra_bit_slice == 1) {
 929             READ_UINT8(&br, junk8, 8);
 930             READ_UINT8(&br, extra_bit_slice, 1);
 931         }
 932     }
 933     macroblock_offset = gst_bit_reader_get_pos(&br);
 934
 935     mb_y = slice_no;
 936     mb_x = -1;
 937     do {
 938         if (!decode_vlc(&br, &mb_inc, mpeg2_mbaddr_vlc_table,
 939                         G_N_ELEMENTS(mpeg2_mbaddr_vlc_table))) {
 940             GST_WARNING("failed to decode first macroblock_address_increment");
 941             goto failed;
 942         }
 943         mb_x += mb_inc == GST_MPEG_VIDEO_MACROBLOCK_ESCAPE ? 33 : mb_inc;
 944     } while (mb_inc == GST_MPEG_VIDEO_MACROBLOCK_ESCAPE);
 945
 946     /* Fill in VASliceParameterBufferMPEG2 */
 947     slice_param                            = slice->param;
 948     slice_param->macroblock_offset         = macroblock_offset;
 949     slice_param->slice_horizontal_position = mb_x;
 950     slice_param->slice_vertical_position   = mb_y;
 951     slice_param->quantiser_scale_code      = quantiser_scale_code;
 952     slice_param->intra_slice_flag          = intra_slice;
 953     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 954
 955 failed:
 956     return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 957 }
 958
 959 static inline gint
 960 scan_for_start_code(GstAdapter *adapter, guint ofs, guint size, guint32 *scp)
 961 {
 962     return (gint)gst_adapter_masked_scan_uint32_peek(adapter,
 963                                                      0xffffff00, 0x00000100,
 964                                                      ofs, size,
 965                                                      scp);
 966 }
 967
 968 static GstVaapiDecoderStatus
 969 decode_buffer(GstVaapiDecoderMpeg2 *decoder, GstBuffer *buffer)
 970 {
 971     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 972     GstVaapiDecoderStatus status;
 973     guchar *buf;
 974     guint buf_size, size;
 975     guint32 start_code;
 976     guint8 type;
 977     gint ofs;
 978
 979     buf      = GST_BUFFER_DATA(buffer);
 980     buf_size = GST_BUFFER_SIZE(buffer);
 981     if (!buf && buf_size == 0)
 982         return decode_sequence_end(decoder);
 983
 984     gst_adapter_push(priv->adapter, gst_buffer_ref(buffer));
 985
 986     size   = gst_adapter_available(priv->adapter);
 987     status = GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
 988     do {
 989         if (size < 8)
 990             break;
 991         ofs = scan_for_start_code(priv->adapter, 0, size, &start_code);
 992         if (ofs < 0)
 993             break;
 994         gst_adapter_flush(priv->adapter, ofs);
 995         size -= ofs;
 996
 997         status = gst_vaapi_decoder_check_status(GST_VAAPI_DECODER(decoder));
 998         if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
 999             break;
1000
1001         if (size < 8)
1002             break;
1003         ofs = scan_for_start_code(priv->adapter, 4, size - 4, NULL);
1004         if (ofs < 0)
1005             break;
1006         buffer = gst_adapter_take_buffer(priv->adapter, ofs);
1007         size -= ofs;
1008
1009         if (ofs == 4) {
1010             // Ignore empty user-data packets
1011             if ((start_code & 0xff) == GST_MPEG_VIDEO_PACKET_USER_DATA)
1012                 continue;
1013             GST_ERROR("failed to get a valid packet (SC: 0x%08x)", start_code);
1014             status = GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
1015             break;
1016         }
1017
1018         buf      = GST_BUFFER_DATA(buffer);
1019         buf_size = GST_BUFFER_SIZE(buffer);
1020
1021         type = start_code & 0xff;
1022         switch (type) {
1023         case GST_MPEG_VIDEO_PACKET_PICTURE:
1024             if (!priv->width || !priv->height)
1025                 break;
1026             status = decode_picture(decoder, buf, buf_size);
1027             break;
1028         case GST_MPEG_VIDEO_PACKET_SEQUENCE:
1029             status = decode_sequence(decoder, buf, buf_size);
1030             break;
1031         case GST_MPEG_VIDEO_PACKET_EXTENSION: {
1032             const guchar id = buf[4] >> 4;
1033             switch (id) {
1034             case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE:
1035                 status = decode_sequence_ext(decoder, buf, buf_size);
1036                 break;
1037             case GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX:
1038                 status = decode_quant_matrix_ext(decoder, buf, buf_size);
1039                 break;
1040             case GST_MPEG_VIDEO_PACKET_EXT_PICTURE:
1041                 if (!priv->width || !priv->height)
1042                     break;
1043                 status = decode_picture_ext(decoder, buf, buf_size);
1044                 break;
1045             default:
1046                 // Ignore unknown extensions
1047                 GST_WARNING("unsupported start-code extension (0x%02x)", id);
1048                 break;
1049             }
1050             break;
1051         }
1052         case GST_MPEG_VIDEO_PACKET_SEQUENCE_END:
1053             status = decode_sequence_end(decoder);
1054             break;
1055         case GST_MPEG_VIDEO_PACKET_GOP:
1056             status = decode_gop(decoder, buf, buf_size);
1057             break;
1058         case GST_MPEG_VIDEO_PACKET_USER_DATA:
1059             // Ignore user-data packets
1060             status = GST_VAAPI_DECODER_STATUS_SUCCESS;
1061             break;
1062         default:
1063             if (type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN &&
1064                 type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX) {
1065                 if (!priv->current_picture)
1066                     break;
1067                 status = decode_slice(
1068                     decoder,
1069                     type - GST_MPEG_VIDEO_PACKET_SLICE_MIN,
1070                     buf, buf_size
1071                 );
1072                 break;
1073             }
1074             else if (type >= 0xb9 && type <= 0xff) {
1075                 // Ignore system start codes (PES headers)
1076                 status = GST_VAAPI_DECODER_STATUS_SUCCESS;
1077                 break;
1078             }
1079             GST_WARNING("unsupported start code (0x%02x)", type);
1080             status = GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
1081             break;
1082         }
1083         gst_buffer_unref(buffer);
1084     } while (status == GST_VAAPI_DECODER_STATUS_SUCCESS);
1085     return status;
1086 }
1087
1088 GstVaapiDecoderStatus
1089 gst_vaapi_decoder_mpeg2_decode(GstVaapiDecoder *base, GstBuffer *buffer)
1090 {
1091     GstVaapiDecoderMpeg2 * const decoder = GST_VAAPI_DECODER_MPEG2(base);
1092     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1093
1094     g_return_val_if_fail(priv->is_constructed,
1095                          GST_VAAPI_DECODER_STATUS_ERROR_INIT_FAILED);
1096
1097     if (!priv->is_opened) {
1098         priv->is_opened = gst_vaapi_decoder_mpeg2_open(decoder, buffer);
1099         if (!priv->is_opened)
1100             return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_CODEC;
1101     }
1102     return decode_buffer(decoder, buffer);
1103 }
1104
1105 static void
1106 gst_vaapi_decoder_mpeg2_finalize(GObject *object)
1107 {
1108     GstVaapiDecoderMpeg2 * const decoder = GST_VAAPI_DECODER_MPEG2(object);
1109
1110     gst_vaapi_decoder_mpeg2_destroy(decoder);
1111
1112     G_OBJECT_CLASS(gst_vaapi_decoder_mpeg2_parent_class)->finalize(object);
1113 }
1114
1115 static void
1116 gst_vaapi_decoder_mpeg2_constructed(GObject *object)
1117 {
1118     GstVaapiDecoderMpeg2 * const decoder = GST_VAAPI_DECODER_MPEG2(object);
1119     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1120     GObjectClass *parent_class;
1121
1122     parent_class = G_OBJECT_CLASS(gst_vaapi_decoder_mpeg2_parent_class);
1123     if (parent_class->constructed)
1124         parent_class->constructed(object);
1125
1126     priv->is_constructed = gst_vaapi_decoder_mpeg2_create(decoder);
1127 }
1128
1129 static void
1130 gst_vaapi_decoder_mpeg2_class_init(GstVaapiDecoderMpeg2Class *klass)
1131 {
1132     GObjectClass * const object_class = G_OBJECT_CLASS(klass);
1133     GstVaapiDecoderClass * const decoder_class = GST_VAAPI_DECODER_CLASS(klass);
1134
1135     g_type_class_add_private(klass, sizeof(GstVaapiDecoderMpeg2Private));
1136
1137     object_class->finalize      = gst_vaapi_decoder_mpeg2_finalize;
1138     object_class->constructed   = gst_vaapi_decoder_mpeg2_constructed;
1139
1140     decoder_class->decode       = gst_vaapi_decoder_mpeg2_decode;
1141     decoder_class->clear_buffer = gst_vaapi_decoder_mpeg2_clear_buffer;
1142 }
1143
1144 static void
1145 gst_vaapi_decoder_mpeg2_init(GstVaapiDecoderMpeg2 *decoder)
1146 {
1147     GstVaapiDecoderMpeg2Private *priv;
1148
1149     priv                        = GST_VAAPI_DECODER_MPEG2_GET_PRIVATE(decoder);
1150     decoder->priv               = priv;
1151     priv->width                 = 0;
1152     priv->height                = 0;
1153     priv->fps_n                 = 0;
1154     priv->fps_d                 = 0;
1155     priv->hw_profile            = GST_VAAPI_PROFILE_UNKNOWN;
1156     priv->profile               = GST_VAAPI_PROFILE_MPEG2_SIMPLE;
1157     priv->current_picture       = NULL;
1158     priv->adapter               = NULL;
1159     priv->is_constructed        = FALSE;
1160     priv->is_opened             = FALSE;
1161     priv->has_seq_ext           = FALSE;
1162     priv->has_seq_scalable_ext  = FALSE;
1163     priv->has_pic_ext           = FALSE;
1164     priv->has_quant_matrix_ext  = FALSE;
1165     priv->size_changed          = FALSE;
1166     priv->profile_changed       = TRUE; /* Allow fallbacks to work */
1167     priv->quant_matrix_changed  = FALSE;
1168     priv->progressive_sequence  = FALSE;
1169     priv->closed_gop            = FALSE;
1170     priv->broken_link           = FALSE;
1171 }
1172
1173 /**
1174  * gst_vaapi_decoder_mpeg2_new:
1175  * @display: a #GstVaapiDisplay
1176  * @caps: a #GstCaps holding codec information
1177  *
1178  * Creates a new #GstVaapiDecoder for MPEG-2 decoding.  The @caps can
1179  * hold extra information like codec-data and pictured coded size.
1180  *
1181  * Return value: the newly allocated #GstVaapiDecoder object
1182  */
1183 GstVaapiDecoder *
1184 gst_vaapi_decoder_mpeg2_new(GstVaapiDisplay *display, GstCaps *caps)
1185 {
1186     GstVaapiDecoderMpeg2 *decoder;
1187
1188     g_return_val_if_fail(GST_VAAPI_IS_DISPLAY(display), NULL);
1189     g_return_val_if_fail(GST_IS_CAPS(caps), NULL);
1190
1191     decoder = g_object_new(
1192         GST_VAAPI_TYPE_DECODER_MPEG2,
1193         "display",      display,
1194         "caps",         caps,
1195         NULL
1196     );
1197     if (!decoder->priv->is_constructed) {
1198         g_object_unref(decoder);
1199         return NULL;
1200     }
1201     return GST_VAAPI_DECODER_CAST(decoder);
1202 }