gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c

   1 /*
   2  *  gstvaapidecoder_mpeg2.c - MPEG-2 decoder
   3  *
   4  *  Copyright (C) 2011-2012 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 /* ------------------------------------------------------------------------- */
  42 /* --- VLC Reader                                                        --- */
  43 /* ------------------------------------------------------------------------- */
  44
  45 #define READ_UINT8(br, val, nbits) G_STMT_START {  \
  46   if (!gst_bit_reader_get_bits_uint8 (br, &val, nbits)) { \
  47     GST_WARNING ("failed to read uint8, nbits: %d", nbits); \
  48     goto failed; \
  49   } \
  50 } G_STMT_END
  51
  52 #define SKIP(reader, nbits) G_STMT_START { \
  53   if (!gst_bit_reader_skip (reader, nbits)) { \
  54     GST_WARNING ("failed to skip nbits: %d", nbits); \
  55     goto failed; \
  56   } \
  57 } G_STMT_END
  58
  59 /* VLC decoder from gst-plugins-bad */
  60 typedef struct _VLCTable VLCTable;
  61 struct _VLCTable {
  62     gint  value;
  63     guint cword;
  64     guint cbits;
  65 };
  66
  67 static gboolean
  68 decode_vlc(GstBitReader *br, gint *res, const VLCTable *table, guint length)
  69 {
  70     guint8 i;
  71     guint cbits = 0;
  72     guint32 value = 0;
  73
  74     for (i = 0; i < length; i++) {
  75         if (cbits != table[i].cbits) {
  76             cbits = table[i].cbits;
  77             if (!gst_bit_reader_peek_bits_uint32(br, &value, cbits)) {
  78                 goto failed;
  79             }
  80         }
  81
  82         if (value == table[i].cword) {
  83             SKIP(br, cbits);
  84             if (res)
  85                 *res = table[i].value;
  86             return TRUE;
  87         }
  88     }
  89     GST_DEBUG("failed to find VLC code");
  90
  91 failed:
  92     GST_WARNING("failed to decode VLC, returning");
  93     return FALSE;
  94 }
  95
  96 enum {
  97     GST_MPEG_VIDEO_MACROBLOCK_ESCAPE = -1,
  98 };
  99
 100 /* Table B-1: Variable length codes for macroblock_address_increment */
 101 static const VLCTable mpeg2_mbaddr_vlc_table[] = {
 102     {  1, 0x01,  1 },
 103     {  2, 0x03,  3 },
 104     {  3, 0x02,  3 },
 105     {  4, 0x03,  4 },
 106     {  5, 0x02,  4 },
 107     {  6, 0x03,  5 },
 108     {  7, 0x02,  5 },
 109     {  8, 0x07,  7 },
 110     {  9, 0x06,  7 },
 111     { 10, 0x0b,  8 },
 112     { 11, 0x0a,  8 },
 113     { 12, 0x09,  8 },
 114     { 13, 0x08,  8 },
 115     { 14, 0x07,  8 },
 116     { 15, 0x06,  8 },
 117     { 16, 0x17, 10 },
 118     { 17, 0x16, 10 },
 119     { 18, 0x15, 10 },
 120     { 19, 0x14, 10 },
 121     { 20, 0x13, 10 },
 122     { 21, 0x12, 10 },
 123     { 22, 0x23, 11 },
 124     { 23, 0x22, 11 },
 125     { 24, 0x21, 11 },
 126     { 25, 0x20, 11 },
 127     { 26, 0x1f, 11 },
 128     { 27, 0x1e, 11 },
 129     { 28, 0x1d, 11 },
 130     { 29, 0x1c, 11 },
 131     { 30, 0x1b, 11 },
 132     { 31, 0x1a, 11 },
 133     { 32, 0x19, 11 },
 134     { 33, 0x18, 11 },
 135     { GST_MPEG_VIDEO_MACROBLOCK_ESCAPE, 0x08, 11 }
 136 };
 137
 138 /* ------------------------------------------------------------------------- */
 139 /* --- PTS Generator                                                     --- */
 140 /* ------------------------------------------------------------------------- */
 141
 142 typedef struct _PTSGenerator PTSGenerator;
 143 struct _PTSGenerator {
 144     GstClockTime        gop_pts; // Current GOP PTS
 145     GstClockTime        max_pts; // Max picture PTS
 146     guint               gop_tsn; // Absolute GOP TSN
 147     guint               max_tsn; // Max picture TSN, relative to last GOP TSN
 148     guint               ovl_tsn; // How many times TSN overflowed since GOP
 149     guint               lst_tsn; // Last picture TSN
 150     guint               fps_n;
 151     guint               fps_d;
 152 };
 153
 154 static void
 155 pts_init(PTSGenerator *tsg)
 156 {
 157     tsg->gop_pts = GST_CLOCK_TIME_NONE;
 158     tsg->max_pts = GST_CLOCK_TIME_NONE;
 159     tsg->gop_tsn = 0;
 160     tsg->max_tsn = 0;
 161     tsg->ovl_tsn = 0;
 162     tsg->lst_tsn = 0;
 163     tsg->fps_n   = 0;
 164     tsg->fps_d   = 0;
 165 }
 166
 167 static inline GstClockTime
 168 pts_get_duration(PTSGenerator *tsg, guint num_frames)
 169 {
 170     return gst_util_uint64_scale(num_frames,
 171                                  GST_SECOND * tsg->fps_d, tsg->fps_n);
 172 }
 173
 174 static inline guint
 175 pts_get_poc(PTSGenerator *tsg)
 176 {
 177     return tsg->gop_tsn + tsg->ovl_tsn * 1024 + tsg->lst_tsn;
 178 }
 179
 180 static void
 181 pts_set_framerate(PTSGenerator *tsg, guint fps_n, guint fps_d)
 182 {
 183     tsg->fps_n = fps_n;
 184     tsg->fps_d = fps_d;
 185 }
 186
 187 static void
 188 pts_sync(PTSGenerator *tsg, GstClockTime gop_pts)
 189 {
 190     guint gop_tsn;
 191
 192     if (!GST_CLOCK_TIME_IS_VALID(gop_pts) ||
 193         (GST_CLOCK_TIME_IS_VALID(tsg->max_pts) && tsg->max_pts >= gop_pts)) {
 194         /* Invalid GOP PTS, interpolate from the last known picture PTS */
 195         if (GST_CLOCK_TIME_IS_VALID(tsg->max_pts)) {
 196             gop_pts = tsg->max_pts + pts_get_duration(tsg, 1);
 197             gop_tsn = tsg->gop_tsn + tsg->ovl_tsn * 1024 + tsg->max_tsn + 1;
 198         }
 199         else {
 200             gop_pts = 0;
 201             gop_tsn = 0;
 202         }
 203     }
 204     else {
 205         /* Interpolate GOP TSN from this valid PTS */
 206         if (GST_CLOCK_TIME_IS_VALID(tsg->gop_pts))
 207             gop_tsn = tsg->gop_tsn + gst_util_uint64_scale(
 208                 gop_pts - tsg->gop_pts + pts_get_duration(tsg, 1) - 1,
 209                 tsg->fps_n, GST_SECOND * tsg->fps_d);
 210         else
 211             gop_tsn = 0;
 212     }
 213
 214     tsg->gop_pts = gop_pts;
 215     tsg->gop_tsn = gop_tsn;
 216     tsg->max_tsn = 0;
 217     tsg->ovl_tsn = 0;
 218     tsg->lst_tsn = 0;
 219 }
 220
 221 static GstClockTime
 222 pts_eval(PTSGenerator *tsg, GstClockTime pic_pts, guint pic_tsn)
 223 {
 224     GstClockTime pts;
 225
 226     if (!GST_CLOCK_TIME_IS_VALID(tsg->gop_pts))
 227         tsg->gop_pts = 0;
 228
 229     pts = tsg->gop_pts + pts_get_duration(tsg, tsg->ovl_tsn * 1024 + pic_tsn);
 230
 231     if (!GST_CLOCK_TIME_IS_VALID(tsg->max_pts) || tsg->max_pts < pts)
 232         tsg->max_pts = pts;
 233
 234     if (tsg->max_tsn < pic_tsn)
 235         tsg->max_tsn = pic_tsn;
 236     else if (tsg->max_tsn == 1023 && pic_tsn < tsg->lst_tsn) { /* TSN wrapped */
 237         tsg->max_tsn = pic_tsn;
 238         tsg->ovl_tsn++;
 239     }
 240     tsg->lst_tsn = pic_tsn;
 241     return pts;
 242 }
 243
 244 /* ------------------------------------------------------------------------- */
 245 /* --- MPEG-2 Parser Info                                                --- */
 246 /* ------------------------------------------------------------------------- */
 247
 248 typedef struct _GstMpegVideoSliceHdr GstMpegVideoSliceHdr;
 249 struct _GstMpegVideoSliceHdr {
 250     guint16 slice_horizontal_position;
 251     guint16 slice_vertical_position;
 252     guint8 quantiser_scale_code;
 253     guint8 intra_slice;
 254
 255     /* Size of the slice() header in bits */
 256     guint header_size;
 257 };
 258
 259 typedef struct _GstVaapiParserInfoMpeg2 GstVaapiParserInfoMpeg2;
 260 struct _GstVaapiParserInfoMpeg2 {
 261     GstMpegVideoPacket  packet;
 262     guint8              extension_type; /* for Extension packets */
 263     union {
 264         GstMpegVideoSequenceHdr         seq_hdr;
 265         GstMpegVideoSequenceExt         seq_ext;
 266         GstMpegVideoSequenceDisplayExt  seq_display_ext;
 267         GstMpegVideoGop                 gop;
 268         GstMpegVideoQuantMatrixExt      quant_matrix;
 269         GstMpegVideoPictureHdr          pic_hdr;
 270         GstMpegVideoPictureExt          pic_ext;
 271         GstMpegVideoSliceHdr            slice_hdr;
 272     }                                   data;
 273 };
 274
 275 static inline const GstVaapiMiniObjectClass *
 276 gst_vaapi_parser_info_mpeg2_class(void)
 277 {
 278     static const GstVaapiMiniObjectClass GstVaapiParserInfoMpeg2Class = {
 279         sizeof(GstVaapiParserInfoMpeg2),
 280         NULL
 281     };
 282     return &GstVaapiParserInfoMpeg2Class;
 283 }
 284
 285 static inline GstVaapiParserInfoMpeg2 *
 286 gst_vaapi_parser_info_mpeg2_new(void)
 287 {
 288     return (GstVaapiParserInfoMpeg2 *)
 289         gst_vaapi_mini_object_new(gst_vaapi_parser_info_mpeg2_class());
 290 }
 291
 292 static inline GstVaapiParserInfoMpeg2 *
 293 gst_vaapi_parser_info_mpeg2_ensure(GstVaapiParserInfoMpeg2 **pi_ptr)
 294 {
 295     GstVaapiParserInfoMpeg2 *pi = *pi_ptr;
 296
 297     if (G_LIKELY(pi != NULL))
 298         return pi;
 299
 300     *pi_ptr = pi = gst_vaapi_parser_info_mpeg2_new();
 301     return pi;
 302 }
 303
 304 #define gst_vaapi_parser_info_mpeg2_ref(pi) \
 305     gst_vaapi_mini_object_ref(GST_VAAPI_MINI_OBJECT(pi))
 306
 307 #define gst_vaapi_parser_info_mpeg2_unref(pi) \
 308     gst_vaapi_mini_object_unref(GST_VAAPI_MINI_OBJECT(pi))
 309
 310 #define gst_vaapi_parser_info_mpeg2_replace(old_pi_ptr, new_pi)         \
 311     gst_vaapi_mini_object_replace((GstVaapiMiniObject **)(old_pi_ptr),  \
 312         (GstVaapiMiniObject *)(new_pi))
 313
 314 /* ------------------------------------------------------------------------- */
 315 /* --- MPEG-2 Decoder                                                    --- */
 316 /* ------------------------------------------------------------------------- */
 317
 318 G_DEFINE_TYPE(GstVaapiDecoderMpeg2,
 319               gst_vaapi_decoder_mpeg2,
 320               GST_VAAPI_TYPE_DECODER)
 321
 322 #define GST_VAAPI_DECODER_MPEG2_CAST(decoder) \
 323     ((GstVaapiDecoderMpeg2 *)(decoder))
 324
 325 #define GST_VAAPI_DECODER_MPEG2_GET_PRIVATE(obj)                \
 326     (G_TYPE_INSTANCE_GET_PRIVATE((obj),                         \
 327                                  GST_VAAPI_TYPE_DECODER_MPEG2,  \
 328                                  GstVaapiDecoderMpeg2Private))
 329
 330 struct _GstVaapiDecoderMpeg2Private {
 331     GstVaapiProfile             profile;
 332     GstVaapiProfile             hw_profile;
 333     guint                       width;
 334     guint                       height;
 335     guint                       fps_n;
 336     guint                       fps_d;
 337     GstVaapiParserInfoMpeg2    *seq_hdr;
 338     GstVaapiParserInfoMpeg2    *seq_ext;
 339     GstVaapiParserInfoMpeg2    *seq_display_ext;
 340     GstVaapiParserInfoMpeg2    *seq_scalable_ext;
 341     GstVaapiParserInfoMpeg2    *gop;
 342     GstVaapiParserInfoMpeg2    *pic_hdr;
 343     GstVaapiParserInfoMpeg2    *pic_ext;
 344     GstVaapiParserInfoMpeg2    *quant_matrix;
 345     GstVaapiParserInfoMpeg2    *slice_hdr;
 346     GstVaapiPicture            *current_picture;
 347     GstVaapiDpb                *dpb;
 348     PTSGenerator                tsg;
 349     guint                       is_constructed          : 1;
 350     guint                       is_opened               : 1;
 351     guint                       size_changed            : 1;
 352     guint                       profile_changed         : 1;
 353     guint                       quant_matrix_changed    : 1;
 354     guint                       progressive_sequence    : 1;
 355     guint                       closed_gop              : 1;
 356     guint                       broken_link             : 1;
 357 };
 358
 359 static void
 360 gst_vaapi_decoder_mpeg2_close(GstVaapiDecoderMpeg2 *decoder)
 361 {
 362     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 363
 364     gst_vaapi_picture_replace(&priv->current_picture, NULL);
 365
 366     gst_vaapi_parser_info_mpeg2_replace(&priv->seq_hdr, NULL);
 367     gst_vaapi_parser_info_mpeg2_replace(&priv->seq_ext, NULL);
 368     gst_vaapi_parser_info_mpeg2_replace(&priv->seq_display_ext, NULL);
 369     gst_vaapi_parser_info_mpeg2_replace(&priv->seq_scalable_ext, NULL);
 370     gst_vaapi_parser_info_mpeg2_replace(&priv->gop, NULL);
 371     gst_vaapi_parser_info_mpeg2_replace(&priv->pic_hdr, NULL);
 372     gst_vaapi_parser_info_mpeg2_replace(&priv->pic_ext, NULL);
 373     gst_vaapi_parser_info_mpeg2_replace(&priv->quant_matrix, NULL);
 374     gst_vaapi_parser_info_mpeg2_replace(&priv->slice_hdr, NULL);
 375
 376     gst_vaapi_dpb_replace(&priv->dpb, NULL);
 377 }
 378
 379 static gboolean
 380 gst_vaapi_decoder_mpeg2_open(GstVaapiDecoderMpeg2 *decoder)
 381 {
 382     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 383
 384     gst_vaapi_decoder_mpeg2_close(decoder);
 385
 386     priv->dpb = gst_vaapi_dpb_new(2);
 387     if (!priv->dpb)
 388         return FALSE;
 389
 390     pts_init(&priv->tsg);
 391     return TRUE;
 392 }
 393
 394 static void
 395 gst_vaapi_decoder_mpeg2_destroy(GstVaapiDecoderMpeg2 *decoder)
 396 {
 397     gst_vaapi_decoder_mpeg2_close(decoder);
 398 }
 399
 400 static gboolean
 401 gst_vaapi_decoder_mpeg2_create(GstVaapiDecoderMpeg2 *decoder)
 402 {
 403     if (!GST_VAAPI_DECODER_CODEC(decoder))
 404         return FALSE;
 405     return TRUE;
 406 }
 407
 408 static inline void
 409 copy_quant_matrix(guint8 dst[64], const guint8 src[64])
 410 {
 411     memcpy(dst, src, 64);
 412 }
 413
 414 static const char *
 415 get_profile_str(GstVaapiProfile profile)
 416 {
 417     char *str;
 418
 419     switch (profile) {
 420     case GST_VAAPI_PROFILE_MPEG2_SIMPLE:    str = "simple";     break;
 421     case GST_VAAPI_PROFILE_MPEG2_MAIN:      str = "main";       break;
 422     case GST_VAAPI_PROFILE_MPEG2_HIGH:      str = "high";       break;
 423     default:                                str = "<unknown>";  break;
 424     }
 425     return str;
 426 }
 427
 428 static GstVaapiProfile
 429 get_profile(GstVaapiDecoderMpeg2 *decoder, GstVaapiEntrypoint entrypoint)
 430 {
 431     GstVaapiDisplay * const va_display = GST_VAAPI_DECODER_DISPLAY(decoder);
 432     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 433     GstVaapiProfile profile = priv->profile;
 434
 435     do {
 436         /* Return immediately if the exact same profile was found */
 437         if (gst_vaapi_display_has_decoder(va_display, profile, entrypoint))
 438             break;
 439
 440         /* Otherwise, try to map to a higher profile */
 441         switch (profile) {
 442         case GST_VAAPI_PROFILE_MPEG2_SIMPLE:
 443             profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
 444             break;
 445         case GST_VAAPI_PROFILE_MPEG2_MAIN:
 446             profile = GST_VAAPI_PROFILE_MPEG2_HIGH;
 447             break;
 448         case GST_VAAPI_PROFILE_MPEG2_HIGH:
 449             // Try to map to main profile if no high profile specific bits used
 450             if (priv->profile == profile &&
 451                 !priv->seq_scalable_ext &&
 452                 (priv->seq_ext &&
 453                  priv->seq_ext->data.seq_ext.chroma_format == 1)) {
 454                 profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
 455                 break;
 456             }
 457             // fall-through
 458         default:
 459             profile = GST_VAAPI_PROFILE_UNKNOWN;
 460             break;
 461         }
 462     } while (profile != GST_VAAPI_PROFILE_UNKNOWN);
 463
 464     if (profile != priv->profile)
 465         GST_INFO("forced %s profile to %s profile",
 466                  get_profile_str(priv->profile), get_profile_str(profile));
 467     return profile;
 468 }
 469
 470 static GstVaapiDecoderStatus
 471 ensure_context(GstVaapiDecoderMpeg2 *decoder)
 472 {
 473     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 474     GstVaapiEntrypoint entrypoint = GST_VAAPI_ENTRYPOINT_VLD;
 475     gboolean reset_context = FALSE;
 476
 477     if (priv->profile_changed) {
 478         GST_DEBUG("profile changed");
 479         priv->profile_changed = FALSE;
 480         reset_context         = TRUE;
 481
 482         priv->hw_profile = get_profile(decoder, entrypoint);
 483         if (priv->hw_profile == GST_VAAPI_PROFILE_UNKNOWN)
 484             return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
 485     }
 486
 487     if (priv->size_changed) {
 488         GST_DEBUG("size changed");
 489         priv->size_changed = FALSE;
 490         reset_context      = TRUE;
 491     }
 492
 493     if (reset_context) {
 494         GstVaapiContextInfo info;
 495
 496         info.profile    = priv->hw_profile;
 497         info.entrypoint = entrypoint;
 498         info.width      = priv->width;
 499         info.height     = priv->height;
 500         info.ref_frames = 2;
 501         reset_context   = gst_vaapi_decoder_ensure_context(
 502             GST_VAAPI_DECODER_CAST(decoder),
 503             &info
 504         );
 505         if (!reset_context)
 506             return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 507     }
 508     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 509 }
 510
 511 static GstVaapiDecoderStatus
 512 ensure_quant_matrix(GstVaapiDecoderMpeg2 *decoder, GstVaapiPicture *picture)
 513 {
 514     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 515     GstMpegVideoSequenceHdr * const seq_hdr = &priv->seq_hdr->data.seq_hdr;
 516     VAIQMatrixBufferMPEG2 *iq_matrix;
 517     guint8 *intra_quant_matrix = NULL;
 518     guint8 *non_intra_quant_matrix = NULL;
 519     guint8 *chroma_intra_quant_matrix = NULL;
 520     guint8 *chroma_non_intra_quant_matrix = NULL;
 521
 522     if (!priv->quant_matrix_changed)
 523         return GST_VAAPI_DECODER_STATUS_SUCCESS;
 524
 525     priv->quant_matrix_changed = FALSE;
 526
 527     picture->iq_matrix = GST_VAAPI_IQ_MATRIX_NEW(MPEG2, decoder);
 528     if (!picture->iq_matrix) {
 529         GST_ERROR("failed to allocate IQ matrix");
 530         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 531     }
 532     iq_matrix = picture->iq_matrix->param;
 533
 534     intra_quant_matrix     = seq_hdr->intra_quantizer_matrix;
 535     non_intra_quant_matrix = seq_hdr->non_intra_quantizer_matrix;
 536
 537     if (priv->quant_matrix) {
 538         GstMpegVideoQuantMatrixExt * const quant_matrix =
 539             &priv->quant_matrix->data.quant_matrix;
 540         if (quant_matrix->load_intra_quantiser_matrix)
 541             intra_quant_matrix = quant_matrix->intra_quantiser_matrix;
 542         if (quant_matrix->load_non_intra_quantiser_matrix)
 543             non_intra_quant_matrix = quant_matrix->non_intra_quantiser_matrix;
 544         if (quant_matrix->load_chroma_intra_quantiser_matrix)
 545             chroma_intra_quant_matrix = quant_matrix->chroma_intra_quantiser_matrix;
 546         if (quant_matrix->load_chroma_non_intra_quantiser_matrix)
 547             chroma_non_intra_quant_matrix = quant_matrix->chroma_non_intra_quantiser_matrix;
 548     }
 549
 550     iq_matrix->load_intra_quantiser_matrix = intra_quant_matrix != NULL;
 551     if (intra_quant_matrix)
 552         copy_quant_matrix(iq_matrix->intra_quantiser_matrix,
 553                           intra_quant_matrix);
 554
 555     iq_matrix->load_non_intra_quantiser_matrix = non_intra_quant_matrix != NULL;
 556     if (non_intra_quant_matrix)
 557         copy_quant_matrix(iq_matrix->non_intra_quantiser_matrix,
 558                           non_intra_quant_matrix);
 559
 560     iq_matrix->load_chroma_intra_quantiser_matrix = chroma_intra_quant_matrix != NULL;
 561     if (chroma_intra_quant_matrix)
 562         copy_quant_matrix(iq_matrix->chroma_intra_quantiser_matrix,
 563                           chroma_intra_quant_matrix);
 564
 565     iq_matrix->load_chroma_non_intra_quantiser_matrix = chroma_non_intra_quant_matrix != NULL;
 566     if (chroma_non_intra_quant_matrix)
 567         copy_quant_matrix(iq_matrix->chroma_non_intra_quantiser_matrix,
 568                           chroma_non_intra_quant_matrix);
 569     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 570 }
 571
 572 static GstVaapiDecoderStatus
 573 decode_current_picture(GstVaapiDecoderMpeg2 *decoder)
 574 {
 575     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 576     GstVaapiPicture * const picture = priv->current_picture;
 577
 578     if (!picture)
 579         return GST_VAAPI_DECODER_STATUS_SUCCESS;
 580
 581     if (!gst_vaapi_picture_decode(picture))
 582         goto error;
 583     if (GST_VAAPI_PICTURE_IS_COMPLETE(picture)) {
 584         if (!gst_vaapi_dpb_add(priv->dpb, picture))
 585             goto error;
 586         gst_vaapi_picture_replace(&priv->current_picture, NULL);
 587     }
 588     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 589
 590 error:
 591     /* XXX: fix for cases where first field failed to be decoded */
 592     gst_vaapi_picture_replace(&priv->current_picture, NULL);
 593     return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 594 }
 595
 596 static GstVaapiDecoderStatus
 597 parse_sequence(GstVaapiDecoderMpeg2 *decoder,
 598     GstVaapiDecoderUnit *unit, GstMpegVideoPacket *packet)
 599 {
 600     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 601     GstMpegVideoSequenceHdr *seq_hdr;
 602
 603     if (!gst_vaapi_parser_info_mpeg2_ensure(&priv->seq_hdr)) {
 604         GST_ERROR("failed to allocate parser info for sequence header");
 605         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 606     }
 607
 608     seq_hdr = &priv->seq_hdr->data.seq_hdr;
 609
 610     if (!gst_mpeg_video_parse_sequence_header(seq_hdr,
 611             packet->data, packet->size, packet->offset)) {
 612         GST_ERROR("failed to parse sequence header");
 613         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 614     }
 615
 616     gst_vaapi_decoder_unit_set_parsed_info(unit, seq_hdr, NULL);
 617     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 618 }
 619
 620 static GstVaapiDecoderStatus
 621 decode_sequence(GstVaapiDecoderMpeg2 *decoder, GstVaapiDecoderUnit *unit)
 622 {
 623     GstVaapiDecoder * const base_decoder = GST_VAAPI_DECODER_CAST(decoder);
 624     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 625     GstMpegVideoSequenceHdr * const seq_hdr = unit->parsed_info;
 626
 627     gst_vaapi_parser_info_mpeg2_replace(&priv->seq_ext, NULL);
 628     gst_vaapi_parser_info_mpeg2_replace(&priv->seq_display_ext, NULL);
 629
 630     priv->fps_n = seq_hdr->fps_n;
 631     priv->fps_d = seq_hdr->fps_d;
 632     pts_set_framerate(&priv->tsg, priv->fps_n, priv->fps_d);
 633     gst_vaapi_decoder_set_framerate(base_decoder, priv->fps_n, priv->fps_d);
 634
 635     priv->width                 = seq_hdr->width;
 636     priv->height                = seq_hdr->height;
 637     priv->size_changed          = TRUE;
 638     priv->quant_matrix_changed  = TRUE;
 639     priv->progressive_sequence  = TRUE;
 640     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 641 }
 642
 643 static GstVaapiDecoderStatus
 644 parse_sequence_ext(GstVaapiDecoderMpeg2 *decoder,
 645     GstVaapiDecoderUnit *unit, GstMpegVideoPacket *packet)
 646 {
 647     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 648     GstMpegVideoSequenceExt *seq_ext;
 649
 650     if (!gst_vaapi_parser_info_mpeg2_ensure(&priv->seq_ext)) {
 651         GST_ERROR("failed to allocate parser info for sequence extension");
 652         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 653     }
 654
 655     seq_ext = &priv->seq_ext->data.seq_ext;
 656
 657     if (!gst_mpeg_video_parse_sequence_extension(seq_ext,
 658             packet->data, packet->size, packet->offset)) {
 659         GST_ERROR("failed to parse sequence-extension");
 660         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 661     }
 662
 663     gst_vaapi_decoder_unit_set_parsed_info(unit, seq_ext, NULL);
 664     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 665 }
 666
 667 static GstVaapiDecoderStatus
 668 decode_sequence_ext(GstVaapiDecoderMpeg2 *decoder, GstVaapiDecoderUnit *unit)
 669 {
 670     GstVaapiDecoder * const base_decoder = GST_VAAPI_DECODER_CAST(decoder);
 671     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 672     GstMpegVideoSequenceExt * const seq_ext = unit->parsed_info;
 673     GstVaapiProfile profile;
 674     guint width, height;
 675
 676     priv->progressive_sequence = seq_ext->progressive;
 677     gst_vaapi_decoder_set_interlaced(base_decoder, !priv->progressive_sequence);
 678
 679     width  = (priv->width  & 0x0fff) | ((guint32)seq_ext->horiz_size_ext << 12);
 680     height = (priv->height & 0x0fff) | ((guint32)seq_ext->vert_size_ext  << 12);
 681     GST_DEBUG("video resolution %ux%u", width, height);
 682
 683     if (seq_ext->fps_n_ext && seq_ext->fps_d_ext) {
 684         priv->fps_n *= seq_ext->fps_n_ext + 1;
 685         priv->fps_d *= seq_ext->fps_d_ext + 1;
 686         pts_set_framerate(&priv->tsg, priv->fps_n, priv->fps_d);
 687         gst_vaapi_decoder_set_framerate(base_decoder, priv->fps_n, priv->fps_d);
 688     }
 689
 690     if (priv->width != width) {
 691         priv->width = width;
 692         priv->size_changed = TRUE;
 693     }
 694
 695     if (priv->height != height) {
 696         priv->height = height;
 697         priv->size_changed = TRUE;
 698     }
 699
 700     switch (seq_ext->profile) {
 701     case GST_MPEG_VIDEO_PROFILE_SIMPLE:
 702         profile = GST_VAAPI_PROFILE_MPEG2_SIMPLE;
 703         break;
 704     case GST_MPEG_VIDEO_PROFILE_MAIN:
 705         profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
 706         break;
 707     case GST_MPEG_VIDEO_PROFILE_HIGH:
 708         profile = GST_VAAPI_PROFILE_MPEG2_HIGH;
 709         break;
 710     default:
 711         GST_ERROR("unsupported profile %d", seq_ext->profile);
 712         return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
 713     }
 714     if (priv->profile != profile) {
 715         priv->profile = profile;
 716         priv->profile_changed = TRUE;
 717     }
 718     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 719 }
 720
 721 static GstVaapiDecoderStatus
 722 parse_sequence_display_ext(GstVaapiDecoderMpeg2 *decoder,
 723     GstVaapiDecoderUnit *unit, GstMpegVideoPacket *packet)
 724 {
 725     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 726     GstMpegVideoSequenceDisplayExt *seq_display_ext;
 727
 728     if (!gst_vaapi_parser_info_mpeg2_ensure(&priv->seq_display_ext)) {
 729         GST_ERROR("failed to allocate parser info for sequence display extension");
 730         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 731     }
 732
 733     seq_display_ext = &priv->seq_display_ext->data.seq_display_ext;
 734
 735     if (!gst_mpeg_video_parse_sequence_display_extension(seq_display_ext,
 736             packet->data, packet->size, packet->offset)) {
 737         GST_ERROR("failed to parse sequence-display-extension");
 738         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 739     }
 740
 741     gst_vaapi_decoder_unit_set_parsed_info(unit, seq_display_ext, NULL);
 742     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 743 }
 744
 745 static GstVaapiDecoderStatus
 746 decode_sequence_display_ext(GstVaapiDecoderMpeg2 *decoder,
 747     GstVaapiDecoderUnit *unit)
 748 {
 749     /* XXX: handle color primaries and cropping */
 750     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 751 }
 752
 753 static GstVaapiDecoderStatus
 754 decode_sequence_end(GstVaapiDecoderMpeg2 *decoder)
 755 {
 756     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 757     GstVaapiDecoderStatus status;
 758
 759     status = decode_current_picture(decoder);
 760     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
 761         return status;
 762
 763     gst_vaapi_dpb_flush(priv->dpb);
 764     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 765 }
 766
 767 static GstVaapiDecoderStatus
 768 parse_quant_matrix_ext(GstVaapiDecoderMpeg2 *decoder,
 769     GstVaapiDecoderUnit *unit, GstMpegVideoPacket *packet)
 770 {
 771     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 772     GstMpegVideoQuantMatrixExt *quant_matrix;
 773
 774     if (!gst_vaapi_parser_info_mpeg2_ensure(&priv->quant_matrix)) {
 775         GST_ERROR("failed to allocate parser info for quantization matrix");
 776         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 777     }
 778
 779     quant_matrix = &priv->quant_matrix->data.quant_matrix;
 780
 781     if (!gst_mpeg_video_parse_quant_matrix_extension(quant_matrix,
 782             packet->data, packet->size, packet->offset)) {
 783         GST_ERROR("failed to parse quant-matrix-extension");
 784         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 785     }
 786
 787     gst_vaapi_decoder_unit_set_parsed_info(unit, quant_matrix, NULL);
 788     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 789 }
 790
 791 static GstVaapiDecoderStatus
 792 decode_quant_matrix_ext(GstVaapiDecoderMpeg2 *decoder,
 793     GstVaapiDecoderUnit *unit)
 794 {
 795     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 796
 797     priv->quant_matrix_changed = TRUE;
 798     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 799 }
 800
 801 static GstVaapiDecoderStatus
 802 parse_gop(GstVaapiDecoderMpeg2 *decoder,
 803     GstVaapiDecoderUnit *unit, GstMpegVideoPacket *packet)
 804 {
 805     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 806     GstMpegVideoGop *gop;
 807
 808     if (!gst_vaapi_parser_info_mpeg2_ensure(&priv->gop)) {
 809         GST_ERROR("failed to allocate parser info for GOP");
 810         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 811     }
 812
 813     gop = &priv->gop->data.gop;
 814
 815     if (!gst_mpeg_video_parse_gop(gop,
 816             packet->data, packet->size, packet->offset)) {
 817         GST_ERROR("failed to parse GOP");
 818         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 819     }
 820
 821     gst_vaapi_decoder_unit_set_parsed_info(unit, gop, NULL);
 822     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 823 }
 824
 825 static GstVaapiDecoderStatus
 826 decode_gop(GstVaapiDecoderMpeg2 *decoder, GstVaapiDecoderUnit *unit)
 827 {
 828     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 829     GstMpegVideoGop * const gop = unit->parsed_info;
 830
 831     priv->closed_gop  = gop->closed_gop;
 832     priv->broken_link = gop->broken_link;
 833
 834     GST_DEBUG("GOP %02u:%02u:%02u:%02u (closed_gop %d, broken_link %d)",
 835               gop->hour, gop->minute, gop->second, gop->frame,
 836               priv->closed_gop, priv->broken_link);
 837
 838     pts_sync(&priv->tsg, GST_VAAPI_DECODER_CODEC_FRAME(decoder)->pts);
 839     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 840 }
 841
 842 static GstVaapiDecoderStatus
 843 parse_picture(GstVaapiDecoderMpeg2 *decoder,
 844     GstVaapiDecoderUnit *unit, GstMpegVideoPacket *packet)
 845 {
 846     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 847     GstMpegVideoPictureHdr *pic_hdr;
 848
 849     if (!gst_vaapi_parser_info_mpeg2_ensure(&priv->pic_hdr)) {
 850         GST_ERROR("failed to allocate parser info for picture header");
 851         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 852     }
 853
 854     pic_hdr = &priv->pic_hdr->data.pic_hdr;
 855
 856     if (!gst_mpeg_video_parse_picture_header(pic_hdr,
 857             packet->data, packet->size, packet->offset)) {
 858         GST_ERROR("failed to parse picture header");
 859         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 860     }
 861
 862     gst_vaapi_decoder_unit_set_parsed_info(unit, pic_hdr, NULL);
 863     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 864 }
 865
 866 static GstVaapiDecoderStatus
 867 decode_picture(GstVaapiDecoderMpeg2 *decoder, GstVaapiDecoderUnit *unit)
 868 {
 869     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 870
 871     gst_vaapi_parser_info_mpeg2_replace(&priv->pic_ext, NULL);
 872     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 873 }
 874
 875 static GstVaapiDecoderStatus
 876 parse_picture_ext(GstVaapiDecoderMpeg2 *decoder,
 877     GstVaapiDecoderUnit *unit, GstMpegVideoPacket *packet)
 878 {
 879     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 880     GstMpegVideoPictureExt *pic_ext;
 881
 882     if (!gst_vaapi_parser_info_mpeg2_ensure(&priv->pic_ext)) {
 883         GST_ERROR("failed to allocate parser info for picture extension");
 884         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 885     }
 886
 887     pic_ext = &priv->pic_ext->data.pic_ext;
 888
 889     if (!gst_mpeg_video_parse_picture_extension(pic_ext,
 890             packet->data, packet->size, packet->offset)) {
 891         GST_ERROR("failed to parse picture-extension");
 892         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
 893     }
 894
 895     gst_vaapi_decoder_unit_set_parsed_info(unit, pic_ext, NULL);
 896     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 897 }
 898
 899 static GstVaapiDecoderStatus
 900 decode_picture_ext(GstVaapiDecoderMpeg2 *decoder, GstVaapiDecoderUnit *unit)
 901 {
 902     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 903     GstMpegVideoPictureExt * const pic_ext = unit->parsed_info;
 904
 905     if (priv->progressive_sequence && !pic_ext->progressive_frame) {
 906         GST_WARNING("invalid interlaced frame in progressive sequence, fixing");
 907         pic_ext->progressive_frame = 1;
 908     }
 909
 910     if (pic_ext->picture_structure == 0 ||
 911         (pic_ext->progressive_frame &&
 912          pic_ext->picture_structure != GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME)) {
 913         GST_WARNING("invalid picture_structure %d, replacing with \"frame\"",
 914                     pic_ext->picture_structure);
 915         pic_ext->picture_structure = GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME;
 916     }
 917     return GST_VAAPI_DECODER_STATUS_SUCCESS;
 918 }
 919
 920 static inline guint32
 921 pack_f_code(guint8 f_code[2][2])
 922 {
 923     return (((guint32)f_code[0][0] << 12) |
 924             ((guint32)f_code[0][1] <<  8) |
 925             ((guint32)f_code[1][0] <<  4) |
 926             (         f_code[1][1]      ));
 927 }
 928
 929 static GstVaapiDecoderStatus
 930 init_picture(GstVaapiDecoderMpeg2 *decoder, GstVaapiPicture *picture)
 931 {
 932     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
 933     GstMpegVideoPictureHdr * const pic_hdr = &priv->pic_hdr->data.pic_hdr;
 934     GstMpegVideoPictureExt * const pic_ext = &priv->pic_ext->data.pic_ext;
 935
 936     switch (pic_hdr->pic_type) {
 937     case GST_MPEG_VIDEO_PICTURE_TYPE_I:
 938         GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
 939         picture->type = GST_VAAPI_PICTURE_TYPE_I;
 940         break;
 941     case GST_MPEG_VIDEO_PICTURE_TYPE_P:
 942         GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
 943         picture->type = GST_VAAPI_PICTURE_TYPE_P;
 944         break;
 945     case GST_MPEG_VIDEO_PICTURE_TYPE_B:
 946         picture->type = GST_VAAPI_PICTURE_TYPE_B;
 947         break;
 948     default:
 949         GST_ERROR("unsupported picture type %d", pic_hdr->pic_type);
 950         return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
 951     }
 952
 953     if (!priv->progressive_sequence && !pic_ext->progressive_frame) {
 954         GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_INTERLACED);
 955         if (pic_ext->top_field_first)
 956             GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_TFF);
 957     }
 958
 959     switch (pic_ext->picture_structure) {
 960     case GST_MPEG_VIDEO_PICTURE_STRUCTURE_TOP_FIELD:
 961         picture->structure = GST_VAAPI_PICTURE_STRUCTURE_TOP_FIELD;
 962         break;
 963     case GST_MPEG_VIDEO_PICTURE_STRUCTURE_BOTTOM_FIELD:
 964         picture->structure = GST_VAAPI_PICTURE_STRUCTURE_BOTTOM_FIELD;
 965         break;
 966     case GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME:
 967         picture->structure = GST_VAAPI_PICTURE_STRUCTURE_FRAME;
 968         break;
 969     }
 970
 971     /* Allocate dummy picture for first field based I-frame */
 972     if (picture->type == GST_VAAPI_PICTURE_TYPE_I &&
 973         !GST_VAAPI_PICTURE_IS_FRAME(picture) &&
 974         gst_vaapi_dpb_size(priv->dpb) == 0) {
 975         GstVaapiPicture *dummy_picture;
 976         gboolean success;
 977
 978         dummy_picture = GST_VAAPI_PICTURE_NEW(MPEG2, decoder);
 979         if (!dummy_picture) {
 980             GST_ERROR("failed to allocate dummy picture");
 981             return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
 982         }
 983
 984         dummy_picture->type      = GST_VAAPI_PICTURE_TYPE_I;
 985         dummy_picture->pts       = GST_CLOCK_TIME_NONE;
 986         dummy_picture->poc       = -1;
 987         dummy_picture->structure = GST_VAAPI_PICTURE_STRUCTURE_FRAME;
 988
 989         GST_VAAPI_PICTURE_FLAG_SET(
 990             dummy_picture,
 991             (GST_VAAPI_PICTURE_FLAG_SKIPPED |
 992              GST_VAAPI_PICTURE_FLAG_REFERENCE)
 993         );
 994
 995         success = gst_vaapi_dpb_add(priv->dpb, dummy_picture);
 996         gst_vaapi_picture_unref(dummy_picture);
 997         if (!success) {
 998             GST_ERROR("failed to add dummy picture into DPB");
 999             return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
1000         }
1001         GST_INFO("allocated dummy picture for first field based I-frame");
1002     }
1003
1004     /* Update presentation time */
1005     picture->pts = pts_eval(&priv->tsg,
1006         GST_VAAPI_DECODER_CODEC_FRAME(decoder)->pts, pic_hdr->tsn);
1007     picture->poc = pts_get_poc(&priv->tsg);
1008     return GST_VAAPI_DECODER_STATUS_SUCCESS;
1009 }
1010
1011 static void
1012 fill_picture(GstVaapiDecoderMpeg2 *decoder, GstVaapiPicture *picture)
1013 {
1014     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1015     VAPictureParameterBufferMPEG2 * const pic_param = picture->param;
1016     GstMpegVideoPictureHdr * const pic_hdr = &priv->pic_hdr->data.pic_hdr;
1017     GstMpegVideoPictureExt * const pic_ext = &priv->pic_ext->data.pic_ext;
1018     GstVaapiPicture *prev_picture, *next_picture;
1019
1020     /* Fill in VAPictureParameterBufferMPEG2 */
1021     pic_param->horizontal_size            = priv->width;
1022     pic_param->vertical_size              = priv->height;
1023     pic_param->forward_reference_picture  = VA_INVALID_ID;
1024     pic_param->backward_reference_picture = VA_INVALID_ID;
1025     pic_param->picture_coding_type        = pic_hdr->pic_type;
1026     pic_param->f_code                     = pack_f_code(pic_ext->f_code);
1027
1028 #define COPY_FIELD(a, b, f) \
1029     pic_param->a.b.f = pic_ext->f
1030     pic_param->picture_coding_extension.value = 0;
1031     pic_param->picture_coding_extension.bits.is_first_field =
1032         GST_VAAPI_PICTURE_IS_FIRST_FIELD(picture);
1033     COPY_FIELD(picture_coding_extension, bits, intra_dc_precision);
1034     COPY_FIELD(picture_coding_extension, bits, picture_structure);
1035     COPY_FIELD(picture_coding_extension, bits, top_field_first);
1036     COPY_FIELD(picture_coding_extension, bits, frame_pred_frame_dct);
1037     COPY_FIELD(picture_coding_extension, bits, concealment_motion_vectors);
1038     COPY_FIELD(picture_coding_extension, bits, q_scale_type);
1039     COPY_FIELD(picture_coding_extension, bits, intra_vlc_format);
1040     COPY_FIELD(picture_coding_extension, bits, alternate_scan);
1041     COPY_FIELD(picture_coding_extension, bits, repeat_first_field);
1042     COPY_FIELD(picture_coding_extension, bits, progressive_frame);
1043
1044     gst_vaapi_dpb_get_neighbours(priv->dpb, picture,
1045         &prev_picture, &next_picture);
1046
1047     switch (pic_hdr->pic_type) {
1048     case GST_MPEG_VIDEO_PICTURE_TYPE_B:
1049         if (next_picture)
1050             pic_param->backward_reference_picture = next_picture->surface_id;
1051         if (prev_picture)
1052             pic_param->forward_reference_picture = prev_picture->surface_id;
1053         else if (!priv->closed_gop)
1054             GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_SKIPPED);
1055         break;
1056     case GST_MPEG_VIDEO_PICTURE_TYPE_P:
1057         if (prev_picture)
1058             pic_param->forward_reference_picture = prev_picture->surface_id;
1059         break;
1060     }
1061 }
1062
1063 static GstVaapiDecoderStatus
1064 parse_slice(GstVaapiDecoderMpeg2 *decoder,
1065     GstVaapiDecoderUnit *unit, GstMpegVideoPacket *packet)
1066 {
1067     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1068     GstMpegVideoSliceHdr *slice_hdr;
1069     GstBitReader br;
1070     gint mb_x, mb_y, mb_inc;
1071     guint8 slice_vertical_position_extension;
1072     guint8 extra_bit_slice, junk8;
1073
1074     if (!gst_vaapi_parser_info_mpeg2_ensure(&priv->slice_hdr)) {
1075         GST_ERROR("failed to allocate parser info for slice header");
1076         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
1077     }
1078
1079     slice_hdr = &priv->slice_hdr->data.slice_hdr;
1080
1081     gst_bit_reader_init(&br, packet->data + packet->offset, packet->size);
1082     if (priv->height > 2800)
1083         READ_UINT8(&br, slice_vertical_position_extension, 3);
1084     if (priv->seq_scalable_ext) {
1085         GST_ERROR("failed to parse slice with sequence_scalable_extension()");
1086         return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
1087     }
1088     READ_UINT8(&br, slice_hdr->quantiser_scale_code, 5);
1089     READ_UINT8(&br, extra_bit_slice, 1);
1090     if (!extra_bit_slice)
1091         slice_hdr->intra_slice = 0;
1092     else {
1093         READ_UINT8(&br, slice_hdr->intra_slice, 1);
1094         READ_UINT8(&br, junk8, 7);
1095         READ_UINT8(&br, extra_bit_slice, 1);
1096         while (extra_bit_slice) {
1097             READ_UINT8(&br, junk8, 8);
1098             READ_UINT8(&br, extra_bit_slice, 1);
1099         }
1100     }
1101     slice_hdr->header_size = 32 + gst_bit_reader_get_pos(&br);
1102
1103     mb_y = packet->type - GST_MPEG_VIDEO_PACKET_SLICE_MIN;
1104     mb_x = -1;
1105     do {
1106         if (!decode_vlc(&br, &mb_inc, mpeg2_mbaddr_vlc_table,
1107                 G_N_ELEMENTS(mpeg2_mbaddr_vlc_table))) {
1108             GST_WARNING("failed to decode first macroblock_address_increment");
1109             goto failed;
1110         }
1111         mb_x += mb_inc == GST_MPEG_VIDEO_MACROBLOCK_ESCAPE ? 33 : mb_inc;
1112     } while (mb_inc == GST_MPEG_VIDEO_MACROBLOCK_ESCAPE);
1113
1114     slice_hdr->slice_horizontal_position = mb_x;
1115     slice_hdr->slice_vertical_position   = mb_y;
1116
1117     gst_vaapi_decoder_unit_set_parsed_info(unit, slice_hdr, NULL);
1118     return GST_VAAPI_DECODER_STATUS_SUCCESS;
1119
1120 failed:
1121     return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
1122 }
1123
1124 static GstVaapiDecoderStatus
1125 decode_slice(GstVaapiDecoderMpeg2 *decoder, GstVaapiDecoderUnit *unit)
1126 {
1127     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1128     GstVaapiPicture * const picture = priv->current_picture;
1129     GstVaapiSlice *slice;
1130     VASliceParameterBufferMPEG2 *slice_param;
1131     GstMpegVideoSliceHdr * const slice_hdr = unit->parsed_info;
1132
1133     GST_DEBUG("slice %d (%u bytes)", slice_hdr->slice_vertical_position,
1134               unit->size);
1135
1136     slice = GST_VAAPI_SLICE_NEW(MPEG2, decoder,
1137         (GST_BUFFER_DATA(GST_VAAPI_DECODER_CODEC_FRAME(decoder)->input_buffer) +
1138          unit->offset), unit->size);
1139     if (!slice) {
1140         GST_ERROR("failed to allocate slice");
1141         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
1142     }
1143     gst_vaapi_picture_add_slice(picture, slice);
1144
1145     /* Fill in VASliceParameterBufferMPEG2 */
1146     slice_param                            = slice->param;
1147     slice_param->macroblock_offset         = slice_hdr->header_size;
1148     slice_param->slice_horizontal_position = slice_hdr->slice_horizontal_position;
1149     slice_param->slice_vertical_position   = slice_hdr->slice_vertical_position;
1150     slice_param->quantiser_scale_code      = slice_hdr->quantiser_scale_code;
1151     slice_param->intra_slice_flag          = slice_hdr->intra_slice;
1152     return GST_VAAPI_DECODER_STATUS_SUCCESS;
1153 }
1154
1155 static inline gint
1156 scan_for_start_code(const guchar *buf, guint buf_size,
1157     GstMpegVideoPacketTypeCode *type_ptr)
1158 {
1159     guint i = 0;
1160
1161     while (i <= (buf_size - 4)) {
1162         if (buf[i + 2] > 1)
1163             i += 3;
1164         else if (buf[i + 1])
1165             i += 2;
1166         else if (buf[i] || buf[i + 2] != 1)
1167             i++;
1168         else
1169             break;
1170     }
1171
1172     if (i <= (buf_size - 4)) {
1173         if (type_ptr)
1174             *type_ptr = buf[i + 3];
1175         return i;
1176     }
1177     return -1;
1178 }
1179
1180 static GstVaapiDecoderStatus
1181 parse_unit(GstVaapiDecoderMpeg2 *decoder, GstVaapiDecoderUnit *unit,
1182     GstMpegVideoPacket *packet)
1183 {
1184     GstMpegVideoPacketTypeCode type;
1185     GstMpegVideoPacketExtensionCode ext_type;
1186     GstVaapiDecoderStatus status;
1187
1188     type = packet->type;
1189     switch (type) {
1190     case GST_MPEG_VIDEO_PACKET_PICTURE:
1191         status = parse_picture(decoder, unit, packet);
1192         break;
1193     case GST_MPEG_VIDEO_PACKET_SEQUENCE:
1194         status = parse_sequence(decoder, unit, packet);
1195         break;
1196     case GST_MPEG_VIDEO_PACKET_EXTENSION:
1197         ext_type = packet->data[4] >> 4;
1198         switch (ext_type) {
1199         case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE:
1200             status = parse_sequence_ext(decoder, unit, packet);
1201             break;
1202         case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE_DISPLAY:
1203             status = parse_sequence_display_ext(decoder, unit, packet);
1204             break;
1205         case GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX:
1206             status = parse_quant_matrix_ext(decoder, unit, packet);
1207             break;
1208         case GST_MPEG_VIDEO_PACKET_EXT_PICTURE:
1209             status = parse_picture_ext(decoder, unit, packet);
1210             break;
1211         default:
1212             status = GST_VAAPI_DECODER_STATUS_SUCCESS;
1213             break;
1214         }
1215         break;
1216     case GST_MPEG_VIDEO_PACKET_GOP:
1217         status = parse_gop(decoder, unit, packet);
1218         break;
1219     default:
1220         if (type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN &&
1221             type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX) {
1222             status = parse_slice(decoder, unit, packet);
1223             break;
1224         }
1225         status = GST_VAAPI_DECODER_STATUS_SUCCESS;
1226         break;
1227     }
1228     return status;
1229 }
1230
1231 static GstVaapiDecoderStatus
1232 decode_unit(GstVaapiDecoderMpeg2 *decoder, GstVaapiDecoderUnit *unit,
1233     GstMpegVideoPacket *packet)
1234 {
1235     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1236     GstMpegVideoPacketTypeCode type;
1237     GstMpegVideoPacketExtensionCode ext_type;
1238     GstVaapiDecoderStatus status;
1239
1240     type = packet->type;
1241     switch (type) {
1242     case GST_MPEG_VIDEO_PACKET_PICTURE:
1243         if (!priv->width || !priv->height)
1244             goto unknown_picture_size;
1245         status = decode_picture(decoder, unit);
1246         break;
1247     case GST_MPEG_VIDEO_PACKET_SEQUENCE:
1248         status = decode_sequence(decoder, unit);
1249         break;
1250     case GST_MPEG_VIDEO_PACKET_EXTENSION:
1251         ext_type = packet->data[4] >> 4;
1252         switch (ext_type) {
1253         case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE:
1254             status = decode_sequence_ext(decoder, unit);
1255             break;
1256         case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE_DISPLAY:
1257             status = decode_sequence_display_ext(decoder, unit);
1258             break;
1259         case GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX:
1260             status = decode_quant_matrix_ext(decoder, unit);
1261             break;
1262         case GST_MPEG_VIDEO_PACKET_EXT_PICTURE:
1263             if (!priv->width || !priv->height)
1264                 goto unknown_picture_size;
1265             status = decode_picture_ext(decoder, unit);
1266             break;
1267         default:
1268             // Ignore unknown start-code extensions
1269             GST_WARNING("unsupported packet extension type 0x%02x", ext_type);
1270             status = GST_VAAPI_DECODER_STATUS_SUCCESS;
1271             break;
1272         }
1273         break;
1274     case GST_MPEG_VIDEO_PACKET_SEQUENCE_END:
1275         status = decode_sequence_end(decoder);
1276         break;
1277     case GST_MPEG_VIDEO_PACKET_GOP:
1278         status = decode_gop(decoder, unit);
1279         break;
1280     default:
1281         if (type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN &&
1282             type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX) {
1283             status = decode_slice(decoder, unit);
1284             break;
1285         }
1286         GST_WARNING("unsupported packet type 0x%02x", type);
1287         status = GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
1288         break;
1289     }
1290     return status;
1291
1292 unknown_picture_size:
1293     // Ignore packet while picture size is undefined
1294     // i.e. missing sequence headers, or not parsed correctly
1295     GST_WARNING("failed to parse picture of unknown size");
1296     return GST_VAAPI_DECODER_STATUS_SUCCESS;
1297 }
1298
1299 static GstVaapiDecoderStatus
1300 ensure_decoder(GstVaapiDecoderMpeg2 *decoder)
1301 {
1302     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1303
1304     g_return_val_if_fail(priv->is_constructed,
1305                          GST_VAAPI_DECODER_STATUS_ERROR_INIT_FAILED);
1306
1307     if (!priv->is_opened) {
1308         priv->is_opened = gst_vaapi_decoder_mpeg2_open(decoder);
1309         if (!priv->is_opened)
1310             return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_CODEC;
1311     }
1312     return GST_VAAPI_DECODER_STATUS_SUCCESS;
1313 }
1314
1315 static GstVaapiDecoderStatus
1316 gst_vaapi_decoder_mpeg2_parse(GstVaapiDecoder *base_decoder,
1317     GstAdapter *adapter, gboolean at_eos, GstVaapiDecoderUnit *unit)
1318 {
1319     GstVaapiDecoderMpeg2 * const decoder =
1320         GST_VAAPI_DECODER_MPEG2_CAST(base_decoder);
1321     GstVaapiParserState * const ps = GST_VAAPI_PARSER_STATE(base_decoder);
1322     GstVaapiDecoderStatus status;
1323     GstMpegVideoPacketTypeCode type, type2 = GST_MPEG_VIDEO_PACKET_NONE;
1324     const guchar *buf;
1325     guint buf_size, flags;
1326     gint ofs, ofs1, ofs2;
1327
1328     status = ensure_decoder(decoder);
1329     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
1330         return status;
1331
1332     buf_size = gst_adapter_available(adapter);
1333     if (buf_size < 4)
1334         return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
1335
1336     buf = gst_adapter_peek(adapter, buf_size);
1337     if (!buf)
1338         return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
1339
1340     ofs = scan_for_start_code(buf, buf_size, &type);
1341     if (ofs < 0)
1342         return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
1343     ofs1 = ofs;
1344
1345     ofs2 = ps->input_offset2 - 4;
1346     if (ofs2 < ofs1 + 4)
1347         ofs2 = ofs1 + 4;
1348
1349     ofs = G_UNLIKELY(buf_size < ofs2 + 4) ? -1 :
1350         scan_for_start_code(&buf[ofs2], buf_size - ofs2, &type2);
1351     if (ofs < 0) {
1352         // Assume the whole packet is present if end-of-stream
1353         if (!at_eos) {
1354             ps->input_offset2 = buf_size;
1355             return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
1356         }
1357         ofs = buf_size - ofs2;
1358     }
1359     ofs2 += ofs;
1360
1361     unit->size = ofs2 - ofs1;
1362     gst_adapter_flush(adapter, ofs1);
1363     ps->input_offset2 = 4;
1364
1365     /* Check for start of new picture */
1366     flags = 0;
1367     switch (type) {
1368     case GST_MPEG_VIDEO_PACKET_SEQUENCE_END:
1369         flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END;
1370         flags |= GST_VAAPI_DECODER_UNIT_FLAG_STREAM_END;
1371         break;
1372     case GST_MPEG_VIDEO_PACKET_USER_DATA:
1373         flags |= GST_VAAPI_DECODER_UNIT_FLAG_SKIP;
1374         /* fall-through */
1375     case GST_MPEG_VIDEO_PACKET_SEQUENCE:
1376     case GST_MPEG_VIDEO_PACKET_GOP:
1377     case GST_MPEG_VIDEO_PACKET_PICTURE:
1378         flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_START;
1379         break;
1380     case GST_MPEG_VIDEO_PACKET_EXTENSION:
1381         if (G_UNLIKELY(unit->size < 5))
1382             return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
1383         break;
1384     default:
1385         if (type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN &&
1386             type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX) {
1387             flags |= GST_VAAPI_DECODER_UNIT_FLAG_SLICE;
1388             switch (type2) {
1389             case GST_MPEG_VIDEO_PACKET_USER_DATA:
1390             case GST_MPEG_VIDEO_PACKET_SEQUENCE:
1391             case GST_MPEG_VIDEO_PACKET_GOP:
1392             case GST_MPEG_VIDEO_PACKET_PICTURE:
1393                 flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END;
1394                 break;
1395             default:
1396                 break;
1397             }
1398         }
1399
1400         // Ignore system start codes (PES headers)
1401         else if (type >= 0xb9 && type <= 0xff)
1402             flags |= GST_VAAPI_DECODER_UNIT_FLAG_SKIP;
1403         break;
1404     }
1405     GST_VAAPI_DECODER_UNIT_FLAG_SET(unit, flags);
1406     return GST_VAAPI_DECODER_STATUS_SUCCESS;
1407 }
1408
1409 static GstVaapiDecoderStatus
1410 gst_vaapi_decoder_mpeg2_decode(GstVaapiDecoder *base_decoder,
1411     GstVaapiDecoderUnit *unit)
1412 {
1413     GstVaapiDecoderMpeg2 * const decoder =
1414         GST_VAAPI_DECODER_MPEG2_CAST(base_decoder);
1415     GstVaapiDecoderStatus status;
1416     GstMpegVideoPacket packet;
1417
1418     status = ensure_decoder(decoder);
1419     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
1420         return status;
1421
1422     packet.data =
1423         (GST_BUFFER_DATA(GST_VAAPI_DECODER_CODEC_FRAME(decoder)->input_buffer) +
1424          unit->offset);
1425     packet.size = unit->size;
1426     packet.type = packet.data[3];
1427     packet.offset = 4;
1428
1429     status = parse_unit(decoder, unit, &packet);
1430     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
1431         return status;
1432     return decode_unit(decoder, unit, &packet);
1433 }
1434
1435 static GstVaapiDecoderStatus
1436 gst_vaapi_decoder_mpeg2_start_frame(GstVaapiDecoder *base_decoder,
1437     GstVaapiDecoderUnit *base_unit)
1438 {
1439     GstVaapiDecoderMpeg2 * const decoder =
1440         GST_VAAPI_DECODER_MPEG2_CAST(base_decoder);
1441     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1442     GstMpegVideoSequenceHdr *seq_hdr;
1443     GstMpegVideoSequenceExt *seq_ext;
1444     GstMpegVideoSequenceDisplayExt *seq_display_ext;
1445     GstVaapiPicture *picture;
1446     GstVaapiDecoderStatus status;
1447
1448     if (!priv->width || !priv->height) {
1449         // Ignore packet while picture size is undefined
1450         // i.e. missing sequence headers, or not parsed correctly
1451         GST_WARNING("failed to decode picture of unknown size");
1452         return GST_VAAPI_DECODER_STATUS_SUCCESS;
1453     }
1454
1455     seq_hdr = &priv->seq_hdr->data.seq_hdr;
1456     seq_ext = priv->seq_ext ? &priv->seq_ext->data.seq_ext : NULL;
1457     seq_display_ext = priv->seq_display_ext ?
1458         &priv->seq_display_ext->data.seq_display_ext : NULL;
1459     if (gst_mpeg_video_finalise_mpeg2_sequence_header(seq_hdr, seq_ext,
1460             seq_display_ext))
1461         gst_vaapi_decoder_set_pixel_aspect_ratio(base_decoder,
1462             seq_hdr->par_w, seq_hdr->par_h);
1463
1464     status = ensure_context(decoder);
1465     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
1466         GST_ERROR("failed to reset context");
1467         return status;
1468     }
1469
1470     if (priv->current_picture) {
1471         /* Re-use current picture where the first field was decoded */
1472         picture = gst_vaapi_picture_new_field(priv->current_picture);
1473         if (!picture) {
1474             GST_ERROR("failed to allocate field picture");
1475             return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
1476         }
1477     }
1478     else {
1479         /* Create new picture */
1480         picture = GST_VAAPI_PICTURE_NEW(MPEG2, decoder);
1481         if (!picture) {
1482             GST_ERROR("failed to allocate picture");
1483             return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
1484         }
1485     }
1486     gst_vaapi_picture_replace(&priv->current_picture, picture);
1487     gst_vaapi_picture_unref(picture);
1488
1489     status = ensure_quant_matrix(decoder, picture);
1490     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
1491         GST_ERROR("failed to reset quantizer matrix");
1492         return status;
1493     }
1494
1495     status = init_picture(decoder, picture);
1496     if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
1497         return status;
1498
1499     fill_picture(decoder, picture);
1500     return GST_VAAPI_DECODER_STATUS_SUCCESS;
1501 }
1502
1503 static GstVaapiDecoderStatus
1504 gst_vaapi_decoder_mpeg2_end_frame(GstVaapiDecoder *base_decoder)
1505 {
1506     GstVaapiDecoderMpeg2 * const decoder =
1507         GST_VAAPI_DECODER_MPEG2_CAST(base_decoder);
1508
1509     return decode_current_picture(decoder);
1510 }
1511
1512 static void
1513 gst_vaapi_decoder_mpeg2_finalize(GObject *object)
1514 {
1515     GstVaapiDecoderMpeg2 * const decoder = GST_VAAPI_DECODER_MPEG2_CAST(object);
1516
1517     gst_vaapi_decoder_mpeg2_destroy(decoder);
1518
1519     G_OBJECT_CLASS(gst_vaapi_decoder_mpeg2_parent_class)->finalize(object);
1520 }
1521
1522 static void
1523 gst_vaapi_decoder_mpeg2_constructed(GObject *object)
1524 {
1525     GstVaapiDecoderMpeg2 * const decoder = GST_VAAPI_DECODER_MPEG2_CAST(object);
1526     GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
1527     GObjectClass *parent_class;
1528
1529     parent_class = G_OBJECT_CLASS(gst_vaapi_decoder_mpeg2_parent_class);
1530     if (parent_class->constructed)
1531         parent_class->constructed(object);
1532
1533     priv->is_constructed = gst_vaapi_decoder_mpeg2_create(decoder);
1534 }
1535
1536 static void
1537 gst_vaapi_decoder_mpeg2_class_init(GstVaapiDecoderMpeg2Class *klass)
1538 {
1539     GObjectClass * const object_class = G_OBJECT_CLASS(klass);
1540     GstVaapiDecoderClass * const decoder_class = GST_VAAPI_DECODER_CLASS(klass);
1541
1542     g_type_class_add_private(klass, sizeof(GstVaapiDecoderMpeg2Private));
1543
1544     object_class->finalize      = gst_vaapi_decoder_mpeg2_finalize;
1545     object_class->constructed   = gst_vaapi_decoder_mpeg2_constructed;
1546
1547     decoder_class->parse        = gst_vaapi_decoder_mpeg2_parse;
1548     decoder_class->decode       = gst_vaapi_decoder_mpeg2_decode;
1549     decoder_class->start_frame  = gst_vaapi_decoder_mpeg2_start_frame;
1550     decoder_class->end_frame    = gst_vaapi_decoder_mpeg2_end_frame;
1551 }
1552
1553 static void
1554 gst_vaapi_decoder_mpeg2_init(GstVaapiDecoderMpeg2 *decoder)
1555 {
1556     GstVaapiDecoderMpeg2Private *priv;
1557
1558     priv                        = GST_VAAPI_DECODER_MPEG2_GET_PRIVATE(decoder);
1559     decoder->priv               = priv;
1560     priv->hw_profile            = GST_VAAPI_PROFILE_UNKNOWN;
1561     priv->profile               = GST_VAAPI_PROFILE_MPEG2_SIMPLE;
1562     priv->profile_changed       = TRUE; /* Allow fallbacks to work */
1563 }
1564
1565 /**
1566  * gst_vaapi_decoder_mpeg2_new:
1567  * @display: a #GstVaapiDisplay
1568  * @caps: a #GstCaps holding codec information
1569  *
1570  * Creates a new #GstVaapiDecoder for MPEG-2 decoding.  The @caps can
1571  * hold extra information like codec-data and pictured coded size.
1572  *
1573  * Return value: the newly allocated #GstVaapiDecoder object
1574  */
1575 GstVaapiDecoder *
1576 gst_vaapi_decoder_mpeg2_new(GstVaapiDisplay *display, GstCaps *caps)
1577 {
1578     GstVaapiDecoderMpeg2 *decoder;
1579
1580     g_return_val_if_fail(GST_VAAPI_IS_DISPLAY(display), NULL);
1581     g_return_val_if_fail(GST_IS_CAPS(caps), NULL);
1582
1583     decoder = g_object_new(
1584         GST_VAAPI_TYPE_DECODER_MPEG2,
1585         "display",      display,
1586         "caps",         caps,
1587         NULL
1588     );
1589     if (!decoder->priv->is_constructed) {
1590         g_object_unref(decoder);
1591         return NULL;
1592     }
1593     return GST_VAAPI_DECODER_CAST(decoder);
1594 }