gstreamer/sys/va/gstvampeg2dec.c
He Junyan 4c66a0265c va: mpeg2dec: Using the current picture's surface when missing reference.
When missing the reference frames, we should not just discard the current
frame. Some streams have group of picture header. It is an optional header
that can be used immediately before a coded I-frame to indicate to the decoder
if the first consecutive B-pictures immediately following the coded I-frame can
be reconstructed properly in the case of a random access.
In that case, the B frames may miss the previous reference and can still be
correctly decoded. We also notice that the second field of the I frame may
be set to P type, and it only ref its first field.
We should not skip all those frames, and even the frame really misses the
reference frame, some manner such as inserting grey picture should be used
to handle these cases.

The driver crashes when it needs to access the reference picture while we set
forward_reference_picture or backward_reference_picture to VA_INVALID_ID. We
now set it to current picture to avoid this. This is just a temp manner.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1929>
2021-01-04 13:09:01 +00:00

722 lines
22 KiB
C

/* GStreamer
* Copyright (C) 2020 Intel Corporation
* Author: He Junyan <junyan.he@intel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the0
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-vampeg2dec
* @title: vampeg2dec
* @short_description: A VA-API based Mpeg2 video decoder
*
* vampeg2dec decodes Mpeg2 bitstreams to VA surfaces using the
* installed and chosen [VA-API](https://01.org/linuxmedia/vaapi)
* driver.
*
* The decoding surfaces can be mapped onto main memory as video
* frames.
*
* ## Example launch line
* ```
* gst-launch-1.0 filesrc location=sample.mpg ! parsebin ! vampeg2dec ! autovideosink
* ```
*
* Since: 1.20
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstvampeg2dec.h"
#include "gstvabasedec.h"
GST_DEBUG_CATEGORY_STATIC (gst_va_mpeg2dec_debug);
#ifndef GST_DISABLE_GST_DEBUG
#define GST_CAT_DEFAULT gst_va_mpeg2dec_debug
#else
#define GST_CAT_DEFAULT NULL
#endif
#define GST_VA_MPEG2_DEC(obj) ((GstVaMpeg2Dec *) obj)
#define GST_VA_MPEG2_DEC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), G_TYPE_FROM_INSTANCE (obj), GstVaMpeg2DecClass))
#define GST_VA_MPEG2_DEC_CLASS(klass) ((GstVaMpeg2DecClass *) klass)
typedef struct _GstVaMpeg2Dec GstVaMpeg2Dec;
typedef struct _GstVaMpeg2DecClass GstVaMpeg2DecClass;
struct _GstVaMpeg2DecClass
{
GstVaBaseDecClass parent_class;
};
struct _GstVaMpeg2Dec
{
GstVaBaseDec parent;
gboolean progressive;
gboolean need_negotiation;
GstMpegVideoSequenceHdr seq;
};
#define parent_class gst_va_base_dec_parent_class
extern gpointer gst_va_base_dec_parent_class;
/* *INDENT-OFF* */
static const gchar *src_caps_str = GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("memory:VAMemory",
"{ NV12 }") " ;" GST_VIDEO_CAPS_MAKE ("{ NV12 }");
/* *INDENT-ON* */
static const gchar *sink_caps_str = "video/x-mpeg2";
static gboolean
gst_va_mpeg2_dec_negotiate (GstVideoDecoder * decoder)
{
GstCapsFeatures *capsfeatures = NULL;
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
GstVaMpeg2Dec *self = GST_VA_MPEG2_DEC (decoder);
GstVideoFormat format = GST_VIDEO_FORMAT_UNKNOWN;
GstMpeg2Decoder *mpeg2dec = GST_MPEG2_DECODER (decoder);
/* Ignore downstream renegotiation request. */
if (!self->need_negotiation)
return TRUE;
self->need_negotiation = FALSE;
if (gst_va_decoder_is_open (base->decoder)
&& !gst_va_decoder_close (base->decoder))
return FALSE;
if (!gst_va_decoder_open (base->decoder, base->profile, base->rt_format))
return FALSE;
if (!gst_va_decoder_set_format (base->decoder, base->width,
base->height, NULL))
return FALSE;
if (base->output_state)
gst_video_codec_state_unref (base->output_state);
gst_va_base_dec_get_preferred_format_and_caps_features (base, &format,
&capsfeatures);
base->output_state =
gst_video_decoder_set_output_state (decoder, format,
base->width, base->height, mpeg2dec->input_state);
if (!self->progressive)
base->output_state->info.interlace_mode = GST_VIDEO_INTERLACE_MODE_MIXED;
base->output_state->caps = gst_video_info_to_caps (&base->output_state->info);
if (capsfeatures)
gst_caps_set_features_simple (base->output_state->caps, capsfeatures);
GST_INFO_OBJECT (self, "Negotiated caps %" GST_PTR_FORMAT,
base->output_state->caps);
return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
}
static VAProfile
_map_profile (GstMpegVideoProfile profile)
{
VAProfile p = VAProfileNone;
switch (profile) {
case GST_MPEG_VIDEO_PROFILE_SIMPLE:
p = VAProfileMPEG2Simple;
break;
case GST_MPEG_VIDEO_PROFILE_MAIN:
p = VAProfileMPEG2Main;
break;
default:
p = VAProfileNone;
break;
}
return p;
}
static VAProfile
_get_profile (GstVaMpeg2Dec * self, GstMpegVideoProfile profile,
const GstMpegVideoSequenceExt * seq_ext,
const GstMpegVideoSequenceScalableExt * seq_scalable_ext)
{
GstVaBaseDec *base = GST_VA_BASE_DEC (self);
VAProfile hw_profile;
hw_profile = _map_profile (profile);
if (hw_profile == VAProfileNone)
return hw_profile;
/* promote the profile if hw does not support, until we get one */
do {
if (gst_va_decoder_has_profile (base->decoder, hw_profile))
return hw_profile;
/* Otherwise, try to map to a higher profile */
switch (profile) {
case GST_MPEG_VIDEO_PROFILE_SIMPLE:
hw_profile = VAProfileMPEG2Main;
break;
case GST_MPEG_VIDEO_PROFILE_HIGH:
/* Try to map to main profile if no high profile specific bits used */
if (!seq_scalable_ext && (seq_ext && seq_ext->chroma_format == 1)) {
hw_profile = VAProfileMPEG2Main;
break;
}
/* fall-through */
default:
GST_ERROR_OBJECT (self, "profile %d is unsupported.", profile);
hw_profile = VAProfileNone;
break;
}
} while (hw_profile != VAProfileNone);
return hw_profile;
}
static guint
_get_rtformat (GstVaMpeg2Dec * self, GstMpegVideoChromaFormat chroma_format)
{
guint ret = 0;
switch (chroma_format) {
case GST_MPEG_VIDEO_CHROMA_420:
ret = VA_RT_FORMAT_YUV420;
break;
case GST_MPEG_VIDEO_CHROMA_422:
ret = VA_RT_FORMAT_YUV422;
break;
case GST_MPEG_VIDEO_CHROMA_444:
ret = VA_RT_FORMAT_YUV444;
break;
default:
GST_ERROR_OBJECT (self, "Unsupported chroma format: %d ", chroma_format);
break;
}
return ret;
}
static gboolean
gst_va_mpeg2_dec_new_sequence (GstMpeg2Decoder * decoder,
const GstMpegVideoSequenceHdr * seq,
const GstMpegVideoSequenceExt * seq_ext,
const GstMpegVideoSequenceDisplayExt * seq_display_ext,
const GstMpegVideoSequenceScalableExt * seq_scalable_ext)
{
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
GstVaMpeg2Dec *self = GST_VA_MPEG2_DEC (decoder);
VAProfile profile;
GstMpegVideoProfile mpeg_profile;
gboolean negotiation_needed = FALSE;
guint rt_format;
gint width, height;
gboolean progressive;
self->seq = *seq;
width = seq->width;
height = seq->height;
if (seq_ext) {
width = (width & 0x0fff) | ((guint32) seq_ext->horiz_size_ext << 12);
height = (height & 0x0fff) | ((guint32) seq_ext->vert_size_ext << 12);
}
mpeg_profile = GST_MPEG_VIDEO_PROFILE_MAIN;
if (seq_ext)
mpeg_profile = seq_ext->profile;
profile = _get_profile (self, mpeg_profile, seq_ext, seq_scalable_ext);
if (profile == VAProfileNone)
return FALSE;
rt_format = _get_rtformat (self,
seq_ext ? seq_ext->chroma_format : GST_MPEG_VIDEO_CHROMA_420);
if (rt_format == 0)
return FALSE;
if (gst_va_decoder_format_changed (base->decoder, profile,
rt_format, width, height)) {
base->profile = profile;
base->rt_format = rt_format;
base->width = width;
base->height = height;
negotiation_needed = TRUE;
GST_INFO_OBJECT (self, "Format changed to %s [%x] (%dx%d)",
gst_va_profile_name (profile), rt_format, base->width, base->height);
}
progressive = seq_ext ? seq_ext->progressive : 1;
if (self->progressive != progressive) {
self->progressive = progressive;
negotiation_needed = TRUE;
GST_INFO_OBJECT (self, "Interlaced mode changed to %d", !progressive);
}
base->need_valign = FALSE;
base->min_buffers = 2 + 4; /* max num pic references + scratch surfaces */
if (negotiation_needed) {
self->need_negotiation = TRUE;
if (!gst_video_decoder_negotiate (GST_VIDEO_DECODER (self))) {
GST_ERROR_OBJECT (self, "Failed to negotiate with downstream");
return FALSE;
}
}
return TRUE;
}
static gboolean
gst_va_mpeg2_dec_new_picture (GstMpeg2Decoder * decoder,
GstVideoCodecFrame * frame, GstMpeg2Picture * picture)
{
GstFlowReturn ret;
GstVaMpeg2Dec *self = GST_VA_MPEG2_DEC (decoder);
GstVaDecodePicture *pic;
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
GstVideoDecoder *vdec = GST_VIDEO_DECODER (decoder);
ret = gst_video_decoder_allocate_output_frame (vdec, frame);
if (ret != GST_FLOW_OK)
goto error;
pic = gst_va_decode_picture_new (base->decoder, frame->output_buffer);
gst_mpeg2_picture_set_user_data (picture, pic,
(GDestroyNotify) gst_va_decode_picture_free);
GST_LOG_OBJECT (self, "New va decode picture %p - %#x", pic,
gst_va_decode_picture_get_surface (pic));
return TRUE;
error:
{
GST_WARNING_OBJECT (self, "Failed to allocated output buffer, return %s",
gst_flow_get_name (ret));
return FALSE;
}
}
static gboolean
gst_va_mpeg2_dec_new_field_picture (GstMpeg2Decoder * decoder,
const GstMpeg2Picture * first_field, GstMpeg2Picture * second_field)
{
GstVaDecodePicture *first_pic, *second_pic;
GstVaMpeg2Dec *self = GST_VA_MPEG2_DEC (decoder);
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
first_pic = gst_mpeg2_picture_get_user_data ((GstMpeg2Picture *) first_field);
if (!first_pic)
return FALSE;
second_pic = gst_va_decode_picture_new (base->decoder, first_pic->gstbuffer);
gst_mpeg2_picture_set_user_data (second_field, second_pic,
(GDestroyNotify) gst_va_decode_picture_free);
GST_LOG_OBJECT (self, "New va decode picture %p - %#x", second_pic,
gst_va_decode_picture_get_surface (second_pic));
return TRUE;
}
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 inline void
_copy_quant_matrix (guint8 dst[64], const guint8 src[64])
{
memcpy (dst, src, 64);
}
static gboolean
gst_va_mpeg2_dec_add_quant_matrix (GstMpeg2Decoder * decoder,
GstMpeg2Picture * picture, GstMpeg2Slice * slice)
{
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
GstVaMpeg2Dec *self = GST_VA_MPEG2_DEC (decoder);
GstMpegVideoQuantMatrixExt *const quant_matrix = slice->quant_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;
VAIQMatrixBufferMPEG2 iq_matrix = { 0 };
GstVaDecodePicture *va_pic;
intra_quant_matrix = self->seq.intra_quantizer_matrix;
non_intra_quant_matrix = self->seq.non_intra_quantizer_matrix;
if (quant_matrix) {
if (quant_matrix->load_intra_quantiser_matrix)
intra_quant_matrix = quant_matrix->intra_quantiser_matrix;
if (quant_matrix->load_non_intra_quantiser_matrix)
non_intra_quant_matrix = quant_matrix->non_intra_quantiser_matrix;
if (quant_matrix->load_chroma_intra_quantiser_matrix)
chroma_intra_quant_matrix = quant_matrix->chroma_intra_quantiser_matrix;
if (quant_matrix->load_chroma_non_intra_quantiser_matrix)
chroma_non_intra_quant_matrix =
quant_matrix->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);
va_pic = gst_mpeg2_picture_get_user_data (picture);
return gst_va_decoder_add_param_buffer (base->decoder, va_pic,
VAIQMatrixBufferType, &iq_matrix, sizeof (iq_matrix));
}
static gboolean
gst_va_mpeg2_dec_start_picture (GstMpeg2Decoder * decoder,
GstMpeg2Picture * picture, GstMpeg2Slice * slice,
GstMpeg2Picture * prev_picture, GstMpeg2Picture * next_picture)
{
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
GstVaMpeg2Dec *self = GST_VA_MPEG2_DEC (decoder);
GstVaDecodePicture *va_pic;
VAPictureParameterBufferMPEG2 pic_param;
va_pic = gst_mpeg2_picture_get_user_data (picture);
/* *INDENT-OFF* */
pic_param = (VAPictureParameterBufferMPEG2) {
.horizontal_size = base->width,
.vertical_size = base->height,
.forward_reference_picture = VA_INVALID_ID,
.backward_reference_picture = VA_INVALID_ID,
.picture_coding_type = slice->pic_hdr->pic_type,
.f_code = _pack_f_code (slice->pic_ext->f_code),
.picture_coding_extension.bits = {
.is_first_field = (picture->first_field) ? 0 : 1,
.intra_dc_precision = slice->pic_ext->intra_dc_precision,
.picture_structure = slice->pic_ext->picture_structure,
.top_field_first = slice->pic_ext->top_field_first,
.frame_pred_frame_dct = slice->pic_ext->frame_pred_frame_dct,
.concealment_motion_vectors = slice->pic_ext->concealment_motion_vectors,
.q_scale_type = slice->pic_ext->q_scale_type,
.intra_vlc_format = slice->pic_ext->intra_vlc_format,
.alternate_scan = slice->pic_ext->alternate_scan,
.repeat_first_field = slice->pic_ext->repeat_first_field,
.progressive_frame = slice->pic_ext->progressive_frame,
},
};
/* *INDENT-ON* */
if (picture->type == GST_MPEG_VIDEO_PICTURE_TYPE_B
|| picture->type == GST_MPEG_VIDEO_PICTURE_TYPE_P) {
GstVaDecodePicture *prev_pic;
prev_pic =
prev_picture ? gst_mpeg2_picture_get_user_data (prev_picture) : NULL;
if (!prev_pic) {
GST_WARNING_OBJECT (self, "Missing the forward reference picture");
pic_param.forward_reference_picture =
gst_va_decode_picture_get_surface (gst_mpeg2_picture_get_user_data
(picture));
} else {
pic_param.forward_reference_picture =
gst_va_decode_picture_get_surface (prev_pic);
}
}
if (picture->type == GST_MPEG_VIDEO_PICTURE_TYPE_B) {
GstVaDecodePicture *next_pic;
next_pic =
next_picture ? gst_mpeg2_picture_get_user_data (next_picture) : NULL;
if (!next_pic) {
GST_WARNING_OBJECT (self, "Missing the backward reference picture");
pic_param.backward_reference_picture =
gst_va_decode_picture_get_surface (gst_mpeg2_picture_get_user_data
(picture));
} else {
pic_param.backward_reference_picture =
gst_va_decode_picture_get_surface (next_pic);
}
}
if (!gst_va_decoder_add_param_buffer (base->decoder, va_pic,
VAPictureParameterBufferType, &pic_param, sizeof (pic_param)))
return FALSE;
if (!gst_va_mpeg2_dec_add_quant_matrix (decoder, picture, slice))
return FALSE;
return TRUE;
}
static gboolean
gst_va_mpeg2_dec_decode_slice (GstMpeg2Decoder * decoder,
GstMpeg2Picture * picture, GstMpeg2Slice * slice)
{
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
GstMpegVideoSliceHdr *header = &slice->header;
GstMpegVideoPacket *packet = &slice->packet;
GstVaDecodePicture *va_pic;
VASliceParameterBufferMPEG2 slice_param;
/* The slice data pass to driver should be a full packet
include the start code. The packet->offset return by
gst_mpeg_video_parse does not include the start code
and so we need to wrap back 4 bytes. */
g_assert (packet->offset >= 4);
/* *INDENT-OFF* */
slice_param = (VASliceParameterBufferMPEG2) {
.slice_data_size = packet->size + 4 /* start code */,
.slice_data_offset = 0,
.slice_data_flag = VA_SLICE_DATA_FLAG_ALL,
.macroblock_offset = header->header_size + 32,
.slice_horizontal_position = header->mb_column,
.slice_vertical_position = header->mb_row,
.quantiser_scale_code = header->quantiser_scale_code,
.intra_slice_flag = header->intra_slice,
};
/* *INDENT-ON* */
va_pic = gst_mpeg2_picture_get_user_data (picture);
if (!gst_va_decoder_add_slice_buffer (base->decoder, va_pic,
&slice_param, sizeof (slice_param),
(guint8 *) (packet->data + packet->offset - 4 /* start code */ ),
packet->size + 4 /* start code */ ))
return FALSE;
return TRUE;
}
static gboolean
gst_va_mpeg2_dec_end_picture (GstMpeg2Decoder * decoder,
GstMpeg2Picture * picture)
{
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
GstVaDecodePicture *va_pic;
GST_LOG_OBJECT (base, "end picture %p, (poc %d)",
picture, picture->pic_order_cnt);
va_pic = gst_mpeg2_picture_get_user_data (picture);
return gst_va_decoder_decode (base->decoder, va_pic);
}
static GstFlowReturn
gst_va_mpeg2_dec_output_picture (GstMpeg2Decoder * decoder,
GstVideoCodecFrame * frame, GstMpeg2Picture * picture)
{
GstVaBaseDec *base = GST_VA_BASE_DEC (decoder);
GstVaMpeg2Dec *self = GST_VA_MPEG2_DEC (decoder);
GST_LOG_OBJECT (self,
"Outputting picture %p (poc %d)", picture, picture->pic_order_cnt);
if (base->copy_frames)
gst_va_base_dec_copy_output_buffer (base, frame);
if (picture->buffer_flags != 0) {
gboolean interlaced =
(picture->buffer_flags & GST_VIDEO_BUFFER_FLAG_INTERLACED) != 0;
gboolean tff = (picture->buffer_flags & GST_VIDEO_BUFFER_FLAG_TFF) != 0;
GST_TRACE_OBJECT (self,
"apply buffer flags 0x%x (interlaced %d, top-field-first %d)",
picture->buffer_flags, interlaced, tff);
GST_BUFFER_FLAG_SET (frame->output_buffer, picture->buffer_flags);
}
gst_mpeg2_picture_unref (picture);
return gst_video_decoder_finish_frame (GST_VIDEO_DECODER (self), frame);
}
static void
gst_va_mpeg2_dec_init (GTypeInstance * instance, gpointer g_class)
{
gst_va_base_dec_init (GST_VA_BASE_DEC (instance), GST_CAT_DEFAULT);
}
static void
gst_va_mpeg2_dec_dispose (GObject * object)
{
gst_va_base_dec_close (GST_VIDEO_DECODER (object));
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_va_mpeg2_dec_class_init (gpointer g_class, gpointer class_data)
{
GstCaps *src_doc_caps, *sink_doc_caps;
GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstMpeg2DecoderClass *mpeg2decoder_class = GST_MPEG2_DECODER_CLASS (g_class);
GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (g_class);
struct CData *cdata = class_data;
gchar *long_name;
if (cdata->description) {
long_name = g_strdup_printf ("VA-API Mpeg2 Decoder in %s",
cdata->description);
} else {
long_name = g_strdup ("VA-API Mpeg2 Decoder");
}
gst_element_class_set_metadata (element_class, long_name,
"Codec/Decoder/Video/Hardware",
"VA-API based Mpeg2 video decoder", "He Junyan <junyan.he@intel.com>");
sink_doc_caps = gst_caps_from_string (sink_caps_str);
src_doc_caps = gst_caps_from_string (src_caps_str);
gst_va_base_dec_class_init (GST_VA_BASE_DEC_CLASS (g_class), MPEG2,
cdata->render_device_path, cdata->sink_caps, cdata->src_caps,
src_doc_caps, sink_doc_caps);
gobject_class->dispose = gst_va_mpeg2_dec_dispose;
decoder_class->negotiate = GST_DEBUG_FUNCPTR (gst_va_mpeg2_dec_negotiate);
mpeg2decoder_class->new_sequence =
GST_DEBUG_FUNCPTR (gst_va_mpeg2_dec_new_sequence);
mpeg2decoder_class->new_picture =
GST_DEBUG_FUNCPTR (gst_va_mpeg2_dec_new_picture);
mpeg2decoder_class->new_field_picture =
GST_DEBUG_FUNCPTR (gst_va_mpeg2_dec_new_field_picture);
mpeg2decoder_class->start_picture =
GST_DEBUG_FUNCPTR (gst_va_mpeg2_dec_start_picture);
mpeg2decoder_class->decode_slice =
GST_DEBUG_FUNCPTR (gst_va_mpeg2_dec_decode_slice);
mpeg2decoder_class->end_picture =
GST_DEBUG_FUNCPTR (gst_va_mpeg2_dec_end_picture);
mpeg2decoder_class->output_picture =
GST_DEBUG_FUNCPTR (gst_va_mpeg2_dec_output_picture);
g_free (long_name);
g_free (cdata->description);
g_free (cdata->render_device_path);
gst_caps_unref (cdata->src_caps);
gst_caps_unref (cdata->sink_caps);
g_free (cdata);
}
static gpointer
_register_debug_category (gpointer data)
{
GST_DEBUG_CATEGORY_INIT (gst_va_mpeg2dec_debug, "vampeg2dec", 0,
"VA Mpeg2 decoder");
return NULL;
}
gboolean
gst_va_mpeg2_dec_register (GstPlugin * plugin, GstVaDevice * device,
GstCaps * sink_caps, GstCaps * src_caps, guint rank)
{
static GOnce debug_once = G_ONCE_INIT;
GType type;
GTypeInfo type_info = {
.class_size = sizeof (GstVaMpeg2DecClass),
.class_init = gst_va_mpeg2_dec_class_init,
.instance_size = sizeof (GstVaMpeg2Dec),
.instance_init = gst_va_mpeg2_dec_init,
};
struct CData *cdata;
gboolean ret;
gchar *type_name, *feature_name;
g_return_val_if_fail (GST_IS_PLUGIN (plugin), FALSE);
g_return_val_if_fail (GST_IS_VA_DEVICE (device), FALSE);
g_return_val_if_fail (GST_IS_CAPS (sink_caps), FALSE);
g_return_val_if_fail (GST_IS_CAPS (src_caps), FALSE);
cdata = g_new (struct CData, 1);
cdata->description = NULL;
cdata->render_device_path = g_strdup (device->render_device_path);
cdata->sink_caps = gst_caps_ref (sink_caps);
cdata->src_caps = gst_caps_ref (src_caps);
/* class data will be leaked if the element never gets instantiated */
GST_MINI_OBJECT_FLAG_SET (cdata->sink_caps,
GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
GST_MINI_OBJECT_FLAG_SET (src_caps, GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
type_info.class_data = cdata;
type_name = g_strdup ("GstVaMpeg2dec");
feature_name = g_strdup ("vampeg2dec");
/* The first decoder to be registered should use a constant name,
* like vampeg2dec, for any additional decoders, we create unique
* names, using inserting the render device name. */
if (g_type_from_name (type_name)) {
gchar *basename = g_path_get_basename (device->render_device_path);
g_free (type_name);
g_free (feature_name);
type_name = g_strdup_printf ("GstVa%sMpeg2Dec", basename);
feature_name = g_strdup_printf ("va%smpeg2dec", basename);
cdata->description = basename;
/* lower rank for non-first device */
if (rank > 0)
rank--;
}
g_once (&debug_once, _register_debug_category, NULL);
type = g_type_register_static (GST_TYPE_MPEG2_DECODER,
type_name, &type_info, 0);
ret = gst_element_register (plugin, feature_name, rank, type);
g_free (type_name);
g_free (feature_name);
return ret;
}