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gstreamer/gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c
Gwenole Beauchesne 50090d6138 mpeg2: initial port to new GstVaapiDecoder API.
2012-12-18 15:31:51 +01:00

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/*
* gstvaapidecoder_mpeg2.c - MPEG-2 decoder
*
* Copyright (C) 2011 Intel Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:gstvaapidecoder_mpeg2
* @short_description: MPEG-2 decoder
*/
#include "sysdeps.h"
#include <string.h>
#include <gst/base/gstbitreader.h>
#include <gst/codecparsers/gstmpegvideoparser.h>
#include "gstvaapidecoder_mpeg2.h"
#include "gstvaapidecoder_objects.h"
#include "gstvaapidecoder_dpb.h"
#include "gstvaapidecoder_priv.h"
#include "gstvaapidisplay_priv.h"
#include "gstvaapiobject_priv.h"
#define DEBUG 1
#include "gstvaapidebug.h"
G_DEFINE_TYPE(GstVaapiDecoderMpeg2,
gst_vaapi_decoder_mpeg2,
GST_VAAPI_TYPE_DECODER)
#define GST_VAAPI_DECODER_MPEG2_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE((obj), \
GST_VAAPI_TYPE_DECODER_MPEG2, \
GstVaapiDecoderMpeg2Private))
#define READ_UINT8(br, val, nbits) G_STMT_START { \
if (!gst_bit_reader_get_bits_uint8 (br, &val, nbits)) { \
GST_WARNING ("failed to read uint8, nbits: %d", nbits); \
goto failed; \
} \
} G_STMT_END
#define SKIP(reader, nbits) G_STMT_START { \
if (!gst_bit_reader_skip (reader, nbits)) { \
GST_WARNING ("failed to skip nbits: %d", nbits); \
goto failed; \
} \
} G_STMT_END
/* PTS Generator */
typedef struct _PTSGenerator PTSGenerator;
struct _PTSGenerator {
GstClockTime gop_pts; // Current GOP PTS
GstClockTime max_pts; // Max picture PTS
guint gop_tsn; // Absolute GOP TSN
guint max_tsn; // Max picture TSN, relative to last GOP TSN
guint ovl_tsn; // How many times TSN overflowed since GOP
guint lst_tsn; // Last picture TSN
guint fps_n;
guint fps_d;
};
static void
pts_init(PTSGenerator *tsg)
{
tsg->gop_pts = GST_CLOCK_TIME_NONE;
tsg->max_pts = GST_CLOCK_TIME_NONE;
tsg->gop_tsn = 0;
tsg->max_tsn = 0;
tsg->ovl_tsn = 0;
tsg->lst_tsn = 0;
tsg->fps_n = 0;
tsg->fps_d = 0;
}
static inline GstClockTime
pts_get_duration(PTSGenerator *tsg, guint num_frames)
{
return gst_util_uint64_scale(num_frames,
GST_SECOND * tsg->fps_d, tsg->fps_n);
}
static inline guint
pts_get_poc(PTSGenerator *tsg)
{
return tsg->gop_tsn + tsg->ovl_tsn * 1024 + tsg->lst_tsn;
}
static void
pts_set_framerate(PTSGenerator *tsg, guint fps_n, guint fps_d)
{
tsg->fps_n = fps_n;
tsg->fps_d = fps_d;
}
static void
pts_sync(PTSGenerator *tsg, GstClockTime gop_pts)
{
guint gop_tsn;
if (!GST_CLOCK_TIME_IS_VALID(gop_pts) ||
(GST_CLOCK_TIME_IS_VALID(tsg->max_pts) && tsg->max_pts >= gop_pts)) {
/* Invalid GOP PTS, interpolate from the last known picture PTS */
if (GST_CLOCK_TIME_IS_VALID(tsg->max_pts)) {
gop_pts = tsg->max_pts + pts_get_duration(tsg, 1);
gop_tsn = tsg->gop_tsn + tsg->ovl_tsn * 1024 + tsg->max_tsn + 1;
}
else {
gop_pts = 0;
gop_tsn = 0;
}
}
else {
/* Interpolate GOP TSN from this valid PTS */
if (GST_CLOCK_TIME_IS_VALID(tsg->gop_pts))
gop_tsn = tsg->gop_tsn + gst_util_uint64_scale(
gop_pts - tsg->gop_pts + pts_get_duration(tsg, 1) - 1,
tsg->fps_n, GST_SECOND * tsg->fps_d);
else
gop_tsn = 0;
}
tsg->gop_pts = gop_pts;
tsg->gop_tsn = gop_tsn;
tsg->max_tsn = 0;
tsg->ovl_tsn = 0;
tsg->lst_tsn = 0;
}
static GstClockTime
pts_eval(PTSGenerator *tsg, GstClockTime pic_pts, guint pic_tsn)
{
GstClockTime pts;
if (!GST_CLOCK_TIME_IS_VALID(tsg->gop_pts))
tsg->gop_pts = 0;
pts = tsg->gop_pts + pts_get_duration(tsg, tsg->ovl_tsn * 1024 + pic_tsn);
if (!GST_CLOCK_TIME_IS_VALID(tsg->max_pts) || tsg->max_pts < pts)
tsg->max_pts = pts;
if (tsg->max_tsn < pic_tsn)
tsg->max_tsn = pic_tsn;
else if (tsg->max_tsn == 1023 && pic_tsn < tsg->lst_tsn) { /* TSN wrapped */
tsg->max_tsn = pic_tsn;
tsg->ovl_tsn++;
}
tsg->lst_tsn = pic_tsn;
return pts;
}
struct _GstVaapiDecoderMpeg2Private {
GstVaapiProfile profile;
GstVaapiProfile hw_profile;
guint width;
guint height;
guint fps_n;
guint fps_d;
GstMpegVideoSequenceHdr seq_hdr;
GstMpegVideoSequenceExt seq_ext;
GstMpegVideoPictureHdr pic_hdr;
GstMpegVideoPictureExt pic_ext;
GstMpegVideoQuantMatrixExt quant_matrix_ext;
GstVaapiPicture *current_picture;
GstVaapiDpb *dpb;
PTSGenerator tsg;
guint is_constructed : 1;
guint is_opened : 1;
guint has_seq_ext : 1;
guint has_seq_scalable_ext : 1;
guint has_pic_ext : 1;
guint has_quant_matrix_ext : 1;
guint size_changed : 1;
guint profile_changed : 1;
guint quant_matrix_changed : 1;
guint progressive_sequence : 1;
guint closed_gop : 1;
guint broken_link : 1;
};
/* VLC decoder from gst-plugins-bad */
typedef struct _VLCTable VLCTable;
struct _VLCTable {
gint value;
guint cword;
guint cbits;
};
static gboolean
decode_vlc(GstBitReader *br, gint *res, const VLCTable *table, guint length)
{
guint8 i;
guint cbits = 0;
guint32 value = 0;
for (i = 0; i < length; i++) {
if (cbits != table[i].cbits) {
cbits = table[i].cbits;
if (!gst_bit_reader_peek_bits_uint32(br, &value, cbits)) {
goto failed;
}
}
if (value == table[i].cword) {
SKIP(br, cbits);
if (res)
*res = table[i].value;
return TRUE;
}
}
GST_DEBUG("failed to find VLC code");
failed:
GST_WARNING("failed to decode VLC, returning");
return FALSE;
}
enum {
GST_MPEG_VIDEO_MACROBLOCK_ESCAPE = -1,
};
/* Table B-1: Variable length codes for macroblock_address_increment */
static const VLCTable mpeg2_mbaddr_vlc_table[] = {
{ 1, 0x01, 1 },
{ 2, 0x03, 3 },
{ 3, 0x02, 3 },
{ 4, 0x03, 4 },
{ 5, 0x02, 4 },
{ 6, 0x03, 5 },
{ 7, 0x02, 5 },
{ 8, 0x07, 7 },
{ 9, 0x06, 7 },
{ 10, 0x0b, 8 },
{ 11, 0x0a, 8 },
{ 12, 0x09, 8 },
{ 13, 0x08, 8 },
{ 14, 0x07, 8 },
{ 15, 0x06, 8 },
{ 16, 0x17, 10 },
{ 17, 0x16, 10 },
{ 18, 0x15, 10 },
{ 19, 0x14, 10 },
{ 20, 0x13, 10 },
{ 21, 0x12, 10 },
{ 22, 0x23, 11 },
{ 23, 0x22, 11 },
{ 24, 0x21, 11 },
{ 25, 0x20, 11 },
{ 26, 0x1f, 11 },
{ 27, 0x1e, 11 },
{ 28, 0x1d, 11 },
{ 29, 0x1c, 11 },
{ 30, 0x1b, 11 },
{ 31, 0x1a, 11 },
{ 32, 0x19, 11 },
{ 33, 0x18, 11 },
{ GST_MPEG_VIDEO_MACROBLOCK_ESCAPE, 0x08, 11 }
};
static void
gst_vaapi_decoder_mpeg2_close(GstVaapiDecoderMpeg2 *decoder)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
gst_vaapi_picture_replace(&priv->current_picture, NULL);
if (priv->dpb) {
gst_vaapi_dpb_unref(priv->dpb);
priv->dpb = NULL;
}
}
static gboolean
gst_vaapi_decoder_mpeg2_open(GstVaapiDecoderMpeg2 *decoder)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
gst_vaapi_decoder_mpeg2_close(decoder);
priv->dpb = gst_vaapi_dpb_mpeg2_new();
if (!priv->dpb)
return FALSE;
pts_init(&priv->tsg);
return TRUE;
}
static void
gst_vaapi_decoder_mpeg2_destroy(GstVaapiDecoderMpeg2 *decoder)
{
gst_vaapi_decoder_mpeg2_close(decoder);
}
static gboolean
gst_vaapi_decoder_mpeg2_create(GstVaapiDecoderMpeg2 *decoder)
{
if (!GST_VAAPI_DECODER_CODEC(decoder))
return FALSE;
return TRUE;
}
static inline void
copy_quant_matrix(guint8 dst[64], const guint8 src[64])
{
memcpy(dst, src, 64);
}
static const char *
get_profile_str(GstVaapiProfile profile)
{
char *str;
switch (profile) {
case GST_VAAPI_PROFILE_MPEG2_SIMPLE: str = "simple"; break;
case GST_VAAPI_PROFILE_MPEG2_MAIN: str = "main"; break;
case GST_VAAPI_PROFILE_MPEG2_HIGH: str = "high"; break;
default: str = "<unknown>"; break;
}
return str;
}
static GstVaapiProfile
get_profile(GstVaapiDecoderMpeg2 *decoder, GstVaapiEntrypoint entrypoint)
{
GstVaapiDisplay * const va_display = GST_VAAPI_DECODER_DISPLAY(decoder);
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstVaapiProfile profile = priv->profile;
do {
/* Return immediately if the exact same profile was found */
if (gst_vaapi_display_has_decoder(va_display, profile, entrypoint))
break;
/* Otherwise, try to map to a higher profile */
switch (profile) {
case GST_VAAPI_PROFILE_MPEG2_SIMPLE:
profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
break;
case GST_VAAPI_PROFILE_MPEG2_MAIN:
profile = GST_VAAPI_PROFILE_MPEG2_HIGH;
break;
case GST_VAAPI_PROFILE_MPEG2_HIGH:
// Try to map to main profile if no high profile specific bits used
if (priv->profile == profile &&
!priv->has_seq_scalable_ext &&
(priv->has_seq_ext && priv->seq_ext.chroma_format == 1)) {
profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
break;
}
// fall-through
default:
profile = GST_VAAPI_PROFILE_UNKNOWN;
break;
}
} while (profile != GST_VAAPI_PROFILE_UNKNOWN);
if (profile != priv->profile)
GST_INFO("forced %s profile to %s profile",
get_profile_str(priv->profile), get_profile_str(profile));
return profile;
}
static GstVaapiDecoderStatus
ensure_context(GstVaapiDecoderMpeg2 *decoder)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstVaapiEntrypoint entrypoint = GST_VAAPI_ENTRYPOINT_VLD;
gboolean reset_context = FALSE;
if (priv->profile_changed) {
GST_DEBUG("profile changed");
priv->profile_changed = FALSE;
reset_context = TRUE;
priv->hw_profile = get_profile(decoder, entrypoint);
if (priv->hw_profile == GST_VAAPI_PROFILE_UNKNOWN)
return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
}
if (priv->size_changed) {
GST_DEBUG("size changed");
priv->size_changed = FALSE;
reset_context = TRUE;
}
if (reset_context) {
GstVaapiContextInfo info;
info.profile = priv->hw_profile;
info.entrypoint = entrypoint;
info.width = priv->width;
info.height = priv->height;
info.ref_frames = 2;
reset_context = gst_vaapi_decoder_ensure_context(
GST_VAAPI_DECODER(decoder),
&info
);
if (!reset_context)
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
}
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
ensure_quant_matrix(GstVaapiDecoderMpeg2 *decoder, GstVaapiPicture *picture)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
VAIQMatrixBufferMPEG2 *iq_matrix;
guint8 *intra_quant_matrix = NULL;
guint8 *non_intra_quant_matrix = NULL;
guint8 *chroma_intra_quant_matrix = NULL;
guint8 *chroma_non_intra_quant_matrix = NULL;
if (!priv->quant_matrix_changed)
return GST_VAAPI_DECODER_STATUS_SUCCESS;
priv->quant_matrix_changed = FALSE;
picture->iq_matrix = GST_VAAPI_IQ_MATRIX_NEW(MPEG2, decoder);
if (!picture->iq_matrix) {
GST_ERROR("failed to allocate IQ matrix");
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
iq_matrix = picture->iq_matrix->param;
intra_quant_matrix = priv->seq_hdr.intra_quantizer_matrix;
non_intra_quant_matrix = priv->seq_hdr.non_intra_quantizer_matrix;
if (priv->has_quant_matrix_ext) {
if (priv->quant_matrix_ext.load_intra_quantiser_matrix)
intra_quant_matrix = priv->quant_matrix_ext.intra_quantiser_matrix;
if (priv->quant_matrix_ext.load_non_intra_quantiser_matrix)
non_intra_quant_matrix = priv->quant_matrix_ext.non_intra_quantiser_matrix;
if (priv->quant_matrix_ext.load_chroma_intra_quantiser_matrix)
chroma_intra_quant_matrix = priv->quant_matrix_ext.chroma_intra_quantiser_matrix;
if (priv->quant_matrix_ext.load_chroma_non_intra_quantiser_matrix)
chroma_non_intra_quant_matrix = priv->quant_matrix_ext.chroma_non_intra_quantiser_matrix;
}
iq_matrix->load_intra_quantiser_matrix = intra_quant_matrix != NULL;
if (intra_quant_matrix)
copy_quant_matrix(iq_matrix->intra_quantiser_matrix,
intra_quant_matrix);
iq_matrix->load_non_intra_quantiser_matrix = non_intra_quant_matrix != NULL;
if (non_intra_quant_matrix)
copy_quant_matrix(iq_matrix->non_intra_quantiser_matrix,
non_intra_quant_matrix);
iq_matrix->load_chroma_intra_quantiser_matrix = chroma_intra_quant_matrix != NULL;
if (chroma_intra_quant_matrix)
copy_quant_matrix(iq_matrix->chroma_intra_quantiser_matrix,
chroma_intra_quant_matrix);
iq_matrix->load_chroma_non_intra_quantiser_matrix = chroma_non_intra_quant_matrix != NULL;
if (chroma_non_intra_quant_matrix)
copy_quant_matrix(iq_matrix->chroma_non_intra_quantiser_matrix,
chroma_non_intra_quant_matrix);
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static gboolean
decode_current_picture(GstVaapiDecoderMpeg2 *decoder)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstVaapiPicture * const picture = priv->current_picture;
if (picture) {
if (!gst_vaapi_picture_decode(picture))
return FALSE;
if (GST_VAAPI_PICTURE_IS_COMPLETE(picture)) {
if (!gst_vaapi_dpb_add(priv->dpb, picture))
return FALSE;
gst_vaapi_picture_replace(&priv->current_picture, NULL);
}
}
return TRUE;
}
static GstVaapiDecoderStatus
decode_sequence(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
{
GstVaapiDecoder * const base_decoder = GST_VAAPI_DECODER(decoder);
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstMpegVideoSequenceHdr * const seq_hdr = &priv->seq_hdr;
if (!gst_mpeg_video_parse_sequence_header(seq_hdr, buf, buf_size, 4)) {
GST_ERROR("failed to parse sequence header");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
priv->fps_n = seq_hdr->fps_n;
priv->fps_d = seq_hdr->fps_d;
pts_set_framerate(&priv->tsg, priv->fps_n, priv->fps_d);
gst_vaapi_decoder_set_framerate(base_decoder, priv->fps_n, priv->fps_d);
if (gst_mpeg_video_finalise_mpeg2_sequence_header(seq_hdr, NULL, NULL))
gst_vaapi_decoder_set_pixel_aspect_ratio(base_decoder,
seq_hdr->par_w, seq_hdr->par_h);
priv->width = seq_hdr->width;
priv->height = seq_hdr->height;
priv->has_seq_ext = FALSE;
priv->size_changed = TRUE;
priv->quant_matrix_changed = TRUE;
priv->progressive_sequence = TRUE;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_sequence_ext(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
{
GstVaapiDecoder * const base_decoder = GST_VAAPI_DECODER(decoder);
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstMpegVideoSequenceHdr * const seq_hdr = &priv->seq_hdr;
GstMpegVideoSequenceExt * const seq_ext = &priv->seq_ext;
GstVaapiProfile profile;
guint width, height;
if (!gst_mpeg_video_parse_sequence_extension(seq_ext, buf, buf_size, 4)) {
GST_ERROR("failed to parse sequence-extension");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
priv->has_seq_ext = TRUE;
priv->progressive_sequence = seq_ext->progressive;
gst_vaapi_decoder_set_interlaced(base_decoder, !priv->progressive_sequence);
width = (priv->width & 0x0fff) | ((guint32)seq_ext->horiz_size_ext << 12);
height = (priv->height & 0x0fff) | ((guint32)seq_ext->vert_size_ext << 12);
GST_DEBUG("video resolution %ux%u", width, height);
if (seq_ext->fps_n_ext && seq_ext->fps_d_ext) {
priv->fps_n *= seq_ext->fps_n_ext + 1;
priv->fps_d *= seq_ext->fps_d_ext + 1;
pts_set_framerate(&priv->tsg, priv->fps_n, priv->fps_d);
gst_vaapi_decoder_set_framerate(base_decoder, priv->fps_n, priv->fps_d);
}
if (priv->width != width) {
priv->width = width;
priv->size_changed = TRUE;
}
if (priv->height != height) {
priv->height = height;
priv->size_changed = TRUE;
}
switch (seq_ext->profile) {
case GST_MPEG_VIDEO_PROFILE_SIMPLE:
profile = GST_VAAPI_PROFILE_MPEG2_SIMPLE;
break;
case GST_MPEG_VIDEO_PROFILE_MAIN:
profile = GST_VAAPI_PROFILE_MPEG2_MAIN;
break;
case GST_MPEG_VIDEO_PROFILE_HIGH:
profile = GST_VAAPI_PROFILE_MPEG2_HIGH;
break;
default:
GST_ERROR("unsupported profile %d", seq_ext->profile);
return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
}
if (priv->profile != profile) {
priv->profile = profile;
priv->profile_changed = TRUE;
}
if (gst_mpeg_video_finalise_mpeg2_sequence_header(seq_hdr, seq_ext, NULL))
gst_vaapi_decoder_set_pixel_aspect_ratio(base_decoder,
seq_hdr->par_w, seq_hdr->par_h);
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_sequence_end(GstVaapiDecoderMpeg2 *decoder)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
if (priv->current_picture && !decode_current_picture(decoder))
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
gst_vaapi_dpb_flush(priv->dpb);
return GST_VAAPI_DECODER_STATUS_END_OF_STREAM;
}
static GstVaapiDecoderStatus
decode_quant_matrix_ext(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstMpegVideoQuantMatrixExt * const quant_matrix_ext = &priv->quant_matrix_ext;
if (!gst_mpeg_video_parse_quant_matrix_extension(quant_matrix_ext, buf, buf_size, 4)) {
GST_ERROR("failed to parse quant-matrix-extension");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
priv->has_quant_matrix_ext = TRUE;
priv->quant_matrix_changed = TRUE;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_gop(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstMpegVideoGop gop;
if (!gst_mpeg_video_parse_gop(&gop, buf, buf_size, 4)) {
GST_ERROR("failed to parse GOP");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
priv->closed_gop = gop.closed_gop;
priv->broken_link = gop.broken_link;
GST_DEBUG("GOP %02u:%02u:%02u:%02u (closed_gop %d, broken_link %d)",
gop.hour, gop.minute, gop.second, gop.frame,
priv->closed_gop, priv->broken_link);
pts_sync(&priv->tsg, GST_VAAPI_DECODER_CODEC_FRAME(decoder)->pts);
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_picture(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstMpegVideoPictureHdr * const pic_hdr = &priv->pic_hdr;
GstVaapiPicture *picture;
GstVaapiDecoderStatus status;
status = ensure_context(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
GST_ERROR("failed to reset context");
return status;
}
if (priv->current_picture && !decode_current_picture(decoder))
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
if (priv->current_picture) {
/* Re-use current picture where the first field was decoded */
picture = gst_vaapi_picture_new_field(priv->current_picture);
if (!picture) {
GST_ERROR("failed to allocate field picture");
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
}
else {
/* Create new picture */
picture = GST_VAAPI_PICTURE_NEW(MPEG2, decoder);
if (!picture) {
GST_ERROR("failed to allocate picture");
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
}
gst_vaapi_picture_replace(&priv->current_picture, picture);
gst_vaapi_picture_unref(picture);
status = ensure_quant_matrix(decoder, picture);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
GST_ERROR("failed to reset quantizer matrix");
return status;
}
if (!gst_mpeg_video_parse_picture_header(pic_hdr, buf, buf_size, 4)) {
GST_ERROR("failed to parse picture header");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
priv->has_pic_ext = FALSE;
switch (pic_hdr->pic_type) {
case GST_MPEG_VIDEO_PICTURE_TYPE_I:
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
picture->type = GST_VAAPI_PICTURE_TYPE_I;
break;
case GST_MPEG_VIDEO_PICTURE_TYPE_P:
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
picture->type = GST_VAAPI_PICTURE_TYPE_P;
break;
case GST_MPEG_VIDEO_PICTURE_TYPE_B:
picture->type = GST_VAAPI_PICTURE_TYPE_B;
break;
default:
GST_ERROR("unsupported picture type %d", pic_hdr->pic_type);
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
}
/* Update presentation time */
picture->pts = pts_eval(&priv->tsg,
GST_VAAPI_DECODER_CODEC_FRAME(decoder)->pts, pic_hdr->tsn);
picture->poc = pts_get_poc(&priv->tsg);
return status;
}
static GstVaapiDecoderStatus
decode_picture_ext(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstMpegVideoPictureExt * const pic_ext = &priv->pic_ext;
GstVaapiPicture * const picture = priv->current_picture;
if (!gst_mpeg_video_parse_picture_extension(pic_ext, buf, buf_size, 4)) {
GST_ERROR("failed to parse picture-extension");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
priv->has_pic_ext = TRUE;
if (priv->progressive_sequence && !pic_ext->progressive_frame) {
GST_WARNING("invalid interlaced frame in progressive sequence, fixing");
pic_ext->progressive_frame = 1;
}
if (pic_ext->picture_structure == 0 ||
(pic_ext->progressive_frame &&
pic_ext->picture_structure != GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME)) {
GST_WARNING("invalid picture_structure %d, replacing with \"frame\"",
pic_ext->picture_structure);
pic_ext->picture_structure = GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME;
}
if (!priv->progressive_sequence && !pic_ext->progressive_frame) {
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_INTERLACED);
if (pic_ext->top_field_first)
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_TFF);
}
switch (pic_ext->picture_structure) {
case GST_MPEG_VIDEO_PICTURE_STRUCTURE_TOP_FIELD:
picture->structure = GST_VAAPI_PICTURE_STRUCTURE_TOP_FIELD;
break;
case GST_MPEG_VIDEO_PICTURE_STRUCTURE_BOTTOM_FIELD:
picture->structure = GST_VAAPI_PICTURE_STRUCTURE_BOTTOM_FIELD;
break;
case GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME:
picture->structure = GST_VAAPI_PICTURE_STRUCTURE_FRAME;
break;
}
/* Allocate dummy picture for first field based I-frame */
if (picture->type == GST_VAAPI_PICTURE_TYPE_I &&
!GST_VAAPI_PICTURE_IS_FRAME(picture) &&
gst_vaapi_dpb_size(priv->dpb) == 0) {
GstVaapiPicture *dummy_picture;
gboolean success;
dummy_picture = GST_VAAPI_PICTURE_NEW(MPEG2, decoder);
if (!dummy_picture) {
GST_ERROR("failed to allocate dummy picture");
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
dummy_picture->type = GST_VAAPI_PICTURE_TYPE_I;
dummy_picture->pts = GST_CLOCK_TIME_NONE;
dummy_picture->poc = -1;
dummy_picture->structure = GST_VAAPI_PICTURE_STRUCTURE_FRAME;
GST_VAAPI_PICTURE_FLAG_SET(
dummy_picture,
(GST_VAAPI_PICTURE_FLAG_SKIPPED |
GST_VAAPI_PICTURE_FLAG_REFERENCE)
);
success = gst_vaapi_dpb_add(priv->dpb, dummy_picture);
gst_vaapi_picture_unref(dummy_picture);
if (!success) {
GST_ERROR("failed to add dummy picture into DPB");
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
}
GST_INFO("allocated dummy picture for first field based I-frame");
}
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static inline guint32
pack_f_code(guint8 f_code[2][2])
{
return (((guint32)f_code[0][0] << 12) |
((guint32)f_code[0][1] << 8) |
((guint32)f_code[1][0] << 4) |
( f_code[1][1] ));
}
static gboolean
fill_picture(GstVaapiDecoderMpeg2 *decoder, GstVaapiPicture *picture)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
VAPictureParameterBufferMPEG2 * const pic_param = picture->param;
GstMpegVideoPictureHdr * const pic_hdr = &priv->pic_hdr;
GstMpegVideoPictureExt * const pic_ext = &priv->pic_ext;
GstVaapiPicture *prev_picture, *next_picture;
if (!priv->has_pic_ext)
return FALSE;
/* Fill in VAPictureParameterBufferMPEG2 */
pic_param->horizontal_size = priv->width;
pic_param->vertical_size = priv->height;
pic_param->forward_reference_picture = VA_INVALID_ID;
pic_param->backward_reference_picture = VA_INVALID_ID;
pic_param->picture_coding_type = pic_hdr->pic_type;
pic_param->f_code = pack_f_code(pic_ext->f_code);
#define COPY_FIELD(a, b, f) \
pic_param->a.b.f = pic_ext->f
pic_param->picture_coding_extension.value = 0;
pic_param->picture_coding_extension.bits.is_first_field = GST_VAAPI_PICTURE_IS_FIRST_FIELD(picture);
COPY_FIELD(picture_coding_extension, bits, intra_dc_precision);
COPY_FIELD(picture_coding_extension, bits, picture_structure);
COPY_FIELD(picture_coding_extension, bits, top_field_first);
COPY_FIELD(picture_coding_extension, bits, frame_pred_frame_dct);
COPY_FIELD(picture_coding_extension, bits, concealment_motion_vectors);
COPY_FIELD(picture_coding_extension, bits, q_scale_type);
COPY_FIELD(picture_coding_extension, bits, intra_vlc_format);
COPY_FIELD(picture_coding_extension, bits, alternate_scan);
COPY_FIELD(picture_coding_extension, bits, repeat_first_field);
COPY_FIELD(picture_coding_extension, bits, progressive_frame);
gst_vaapi_dpb_mpeg2_get_references(
priv->dpb,
picture,
&prev_picture,
&next_picture
);
switch (pic_hdr->pic_type) {
case GST_MPEG_VIDEO_PICTURE_TYPE_B:
if (next_picture)
pic_param->backward_reference_picture = next_picture->surface_id;
if (prev_picture)
pic_param->forward_reference_picture = prev_picture->surface_id;
else if (!priv->closed_gop)
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_SKIPPED);
break;
case GST_MPEG_VIDEO_PICTURE_TYPE_P:
if (prev_picture)
pic_param->forward_reference_picture = prev_picture->surface_id;
break;
}
return TRUE;
}
static GstVaapiDecoderStatus
decode_slice(
GstVaapiDecoderMpeg2 *decoder,
int slice_no,
guchar *buf,
guint buf_size
)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstVaapiPicture * const picture = priv->current_picture;
GstVaapiSlice *slice;
VASliceParameterBufferMPEG2 *slice_param;
GstBitReader br;
gint mb_x, mb_y, mb_inc;
guint macroblock_offset;
guint8 slice_vertical_position_extension;
guint8 quantiser_scale_code;
guint8 intra_slice = 0;
guint8 extra_bit_slice, junk8;
GST_DEBUG("slice %d @ %p, %u bytes)", slice_no, buf, buf_size);
if (picture->slices->len == 0 && !fill_picture(decoder, picture))
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
slice = GST_VAAPI_SLICE_NEW(MPEG2, decoder, buf, buf_size);
if (!slice) {
GST_ERROR("failed to allocate slice");
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
gst_vaapi_picture_add_slice(picture, slice);
/* Parse slice */
gst_bit_reader_init(&br, buf, buf_size);
SKIP(&br, 32); /* slice_start_code */
if (priv->height > 2800)
READ_UINT8(&br, slice_vertical_position_extension, 3);
if (priv->has_seq_scalable_ext) {
GST_ERROR("failed to parse slice %d. Unsupported sequence_scalable_extension()", slice_no);
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
READ_UINT8(&br, quantiser_scale_code, 5);
READ_UINT8(&br, extra_bit_slice, 1);
if (extra_bit_slice == 1) {
READ_UINT8(&br, intra_slice, 1);
READ_UINT8(&br, junk8, 7);
READ_UINT8(&br, extra_bit_slice, 1);
while (extra_bit_slice == 1) {
READ_UINT8(&br, junk8, 8);
READ_UINT8(&br, extra_bit_slice, 1);
}
}
macroblock_offset = gst_bit_reader_get_pos(&br);
mb_y = slice_no;
mb_x = -1;
do {
if (!decode_vlc(&br, &mb_inc, mpeg2_mbaddr_vlc_table,
G_N_ELEMENTS(mpeg2_mbaddr_vlc_table))) {
GST_WARNING("failed to decode first macroblock_address_increment");
goto failed;
}
mb_x += mb_inc == GST_MPEG_VIDEO_MACROBLOCK_ESCAPE ? 33 : mb_inc;
} while (mb_inc == GST_MPEG_VIDEO_MACROBLOCK_ESCAPE);
/* Fill in VASliceParameterBufferMPEG2 */
slice_param = slice->param;
slice_param->macroblock_offset = macroblock_offset;
slice_param->slice_horizontal_position = mb_x;
slice_param->slice_vertical_position = mb_y;
slice_param->quantiser_scale_code = quantiser_scale_code;
slice_param->intra_slice_flag = intra_slice;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
failed:
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
static inline gint
scan_for_start_code(GstAdapter *adapter, guint ofs, guint size, guint32 *scp)
{
return (gint)gst_adapter_masked_scan_uint32_peek(adapter,
0xffffff00, 0x00000100,
ofs, size,
scp);
}
static GstVaapiDecoderStatus
decode_packet(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GstVaapiDecoderStatus status;
guchar type;
/* The packet defined by buf and buf_size contains the start code */
type = buf[3];
switch (type) {
case GST_MPEG_VIDEO_PACKET_PICTURE:
if (!priv->width || !priv->height)
goto unknown_picture_size;
status = decode_picture(decoder, buf, buf_size);
break;
case GST_MPEG_VIDEO_PACKET_SEQUENCE:
status = decode_sequence(decoder, buf, buf_size);
break;
case GST_MPEG_VIDEO_PACKET_EXTENSION: {
const guchar id = buf[4] >> 4;
switch (id) {
case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE:
status = decode_sequence_ext(decoder, buf, buf_size);
break;
case GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX:
status = decode_quant_matrix_ext(decoder, buf, buf_size);
break;
case GST_MPEG_VIDEO_PACKET_EXT_PICTURE:
if (!priv->width || !priv->height)
goto unknown_picture_size;
status = decode_picture_ext(decoder, buf, buf_size);
break;
default:
// Ignore unknown start-code extensions
GST_WARNING("unsupported start code extension (0x%02x)", id);
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
break;
}
break;
}
case GST_MPEG_VIDEO_PACKET_SEQUENCE_END:
status = decode_sequence_end(decoder);
break;
case GST_MPEG_VIDEO_PACKET_GOP:
status = decode_gop(decoder, buf, buf_size);
break;
case GST_MPEG_VIDEO_PACKET_USER_DATA:
// Ignore user-data packets
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
break;
default:
if (type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN &&
type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX) {
if (!priv->current_picture)
goto undefined_picture;
status = decode_slice(
decoder,
type - GST_MPEG_VIDEO_PACKET_SLICE_MIN,
buf, buf_size
);
break;
}
else if (type >= 0xb9 && type <= 0xff) {
// Ignore system start codes (PES headers)
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
break;
}
GST_WARNING("unsupported start code (0x%02x)", type);
status = GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
break;
}
return status;
unknown_picture_size:
// Ignore packet while picture size is undefined
// i.e. missing sequence headers, or not parsed correctly
GST_WARNING("failed to parse picture of unknown size");
return GST_VAAPI_DECODER_STATUS_SUCCESS;
undefined_picture:
// Ignore packet while picture is undefined
// i.e. missing picture headers, or not parsed correctly
GST_WARNING("failed to parse slice with undefined picture");
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_buffer(GstVaapiDecoderMpeg2 *decoder, GstBuffer *buffer)
{
GstVaapiDecoderStatus status;
guchar *buf;
guint buf_size;
buf = GST_BUFFER_DATA(buffer);
buf_size = GST_BUFFER_SIZE(buffer);
status = decode_packet(decoder, buf, buf_size);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
return status;
}
static GstVaapiDecoderStatus
ensure_decoder(GstVaapiDecoderMpeg2 *decoder)
{
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
g_return_val_if_fail(priv->is_constructed,
GST_VAAPI_DECODER_STATUS_ERROR_INIT_FAILED);
if (!priv->is_opened) {
priv->is_opened = gst_vaapi_decoder_mpeg2_open(decoder);
if (!priv->is_opened)
return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_CODEC;
}
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
gst_vaapi_decoder_mpeg2_parse(GstVaapiDecoder *base_decoder,
GstAdapter *adapter, gboolean at_eos, GstVaapiDecoderUnit **unit_ptr)
{
GstVaapiDecoderMpeg2 * const decoder =
GST_VAAPI_DECODER_MPEG2(base_decoder);
GstVaapiDecoderUnit *unit = NULL;
GstVaapiDecoderStatus status;
guint32 start_code;
guint8 pkt_type, ext_type;
guint size, buf_size, flags = 0;
gint ofs;
status = ensure_decoder(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
size = gst_adapter_available(adapter);
if (size < 4)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
ofs = scan_for_start_code(adapter, 0, size, &start_code);
if (ofs < 0)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
gst_adapter_flush(adapter, ofs);
size -= ofs;
ofs = G_UNLIKELY(size < 8) ? -1 :
scan_for_start_code(adapter, 4, size - 4, NULL);
if (ofs < 0) {
// Assume the whole packet is present if end-of-stream
if (!at_eos)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
ofs = size;
}
buf_size = ofs;
unit = gst_vaapi_decoder_unit_new(buf_size);
if (!unit)
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
/* Check for start of new picture */
pkt_type = start_code & 0xff;
switch (pkt_type) {
case GST_MPEG_VIDEO_PACKET_SEQUENCE_END:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END;
flags |= GST_VAAPI_DECODER_UNIT_FLAG_STREAM_END;
break;
case GST_MPEG_VIDEO_PACKET_USER_DATA:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SKIP;
/* fall-through */
case GST_MPEG_VIDEO_PACKET_SEQUENCE:
case GST_MPEG_VIDEO_PACKET_GOP:
case GST_MPEG_VIDEO_PACKET_PICTURE:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_START;
break;
case GST_MPEG_VIDEO_PACKET_EXTENSION:
if (buf_size < 5)
break;
gst_adapter_copy(adapter, &ext_type, 4, 1);
switch (ext_type) {
case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_START;
break;
}
break;
default:
if (pkt_type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN &&
pkt_type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX)
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SLICE;
break;
}
GST_VAAPI_DECODER_UNIT_FLAG_SET(unit, flags);
*unit_ptr = unit;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
gst_vaapi_decoder_mpeg2_decode(GstVaapiDecoder *base_decoder,
GstVaapiDecoderUnit *unit)
{
GstVaapiDecoderMpeg2 * const decoder =
GST_VAAPI_DECODER_MPEG2(base_decoder);
GstVaapiDecoderStatus status;
status = ensure_decoder(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
unit->buffer = gst_buffer_create_sub(
GST_VAAPI_DECODER_CODEC_FRAME(decoder)->input_buffer,
unit->offset, unit->size);
if (!unit->buffer)
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
status = decode_buffer(decoder, unit->buffer);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static void
gst_vaapi_decoder_mpeg2_finalize(GObject *object)
{
GstVaapiDecoderMpeg2 * const decoder = GST_VAAPI_DECODER_MPEG2(object);
gst_vaapi_decoder_mpeg2_destroy(decoder);
G_OBJECT_CLASS(gst_vaapi_decoder_mpeg2_parent_class)->finalize(object);
}
static void
gst_vaapi_decoder_mpeg2_constructed(GObject *object)
{
GstVaapiDecoderMpeg2 * const decoder = GST_VAAPI_DECODER_MPEG2(object);
GstVaapiDecoderMpeg2Private * const priv = decoder->priv;
GObjectClass *parent_class;
parent_class = G_OBJECT_CLASS(gst_vaapi_decoder_mpeg2_parent_class);
if (parent_class->constructed)
parent_class->constructed(object);
priv->is_constructed = gst_vaapi_decoder_mpeg2_create(decoder);
}
static void
gst_vaapi_decoder_mpeg2_class_init(GstVaapiDecoderMpeg2Class *klass)
{
GObjectClass * const object_class = G_OBJECT_CLASS(klass);
GstVaapiDecoderClass * const decoder_class = GST_VAAPI_DECODER_CLASS(klass);
g_type_class_add_private(klass, sizeof(GstVaapiDecoderMpeg2Private));
object_class->finalize = gst_vaapi_decoder_mpeg2_finalize;
object_class->constructed = gst_vaapi_decoder_mpeg2_constructed;
decoder_class->parse = gst_vaapi_decoder_mpeg2_parse;
decoder_class->decode = gst_vaapi_decoder_mpeg2_decode;
}
static void
gst_vaapi_decoder_mpeg2_init(GstVaapiDecoderMpeg2 *decoder)
{
GstVaapiDecoderMpeg2Private *priv;
priv = GST_VAAPI_DECODER_MPEG2_GET_PRIVATE(decoder);
decoder->priv = priv;
priv->width = 0;
priv->height = 0;
priv->fps_n = 0;
priv->fps_d = 0;
priv->hw_profile = GST_VAAPI_PROFILE_UNKNOWN;
priv->profile = GST_VAAPI_PROFILE_MPEG2_SIMPLE;
priv->current_picture = NULL;
priv->is_constructed = FALSE;
priv->is_opened = FALSE;
priv->has_seq_ext = FALSE;
priv->has_seq_scalable_ext = FALSE;
priv->has_pic_ext = FALSE;
priv->has_quant_matrix_ext = FALSE;
priv->size_changed = FALSE;
priv->profile_changed = TRUE; /* Allow fallbacks to work */
priv->quant_matrix_changed = FALSE;
priv->progressive_sequence = FALSE;
priv->closed_gop = FALSE;
priv->broken_link = FALSE;
}
/**
* gst_vaapi_decoder_mpeg2_new:
* @display: a #GstVaapiDisplay
* @caps: a #GstCaps holding codec information
*
* Creates a new #GstVaapiDecoder for MPEG-2 decoding. The @caps can
* hold extra information like codec-data and pictured coded size.
*
* Return value: the newly allocated #GstVaapiDecoder object
*/
GstVaapiDecoder *
gst_vaapi_decoder_mpeg2_new(GstVaapiDisplay *display, GstCaps *caps)
{
GstVaapiDecoderMpeg2 *decoder;
g_return_val_if_fail(GST_VAAPI_IS_DISPLAY(display), NULL);
g_return_val_if_fail(GST_IS_CAPS(caps), NULL);
decoder = g_object_new(
GST_VAAPI_TYPE_DECODER_MPEG2,
"display", display,
"caps", caps,
NULL
);
if (!decoder->priv->is_constructed) {
g_object_unref(decoder);
return NULL;
}
return GST_VAAPI_DECODER_CAST(decoder);
}
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