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h265decoder: Calculate DPB size based on level

Browse source 
As specified in "A.4 Tiers and levels", calculate DPB size based
on level in order to avoid over preallocated DPB

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4840>
This commit is contained in:
Seungha Yang 2023-06-13 01:51:48 +09:00 committed by GStreamer Marge Bot
parent b687e19e10
commit e422a991f3
1 changed files with 74 additions and 15 deletions
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89
subprojects/gst-plugins-bad/gst-libs/gst/codecs/gsth265decoder.c
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@ -424,23 +424,68 @@ gst_h265_decoder_set_latency (GstH265Decoder * self, const GstH265SPS * sps,
gst_video_decoder_set_latency (GST_VIDEO_DECODER (self), min, max);
}
static GstFlowReturn
gst_h265_decoder_process_sps (GstH265Decoder * self, GstH265SPS * sps)
typedef struct
{
GstH265DecoderPrivate *priv = self->priv;
gint max_dpb_size;
gint prev_max_dpb_size;
gint MaxLumaPS;
const gint MaxDpbPicBuf = 6;
gint PicSizeInSamplesY;
guint8 field_seq_flag = 0;
guint8 progressive_source_flag = 0;
guint8 interlaced_source_flag = 0;
GstFlowReturn ret = GST_FLOW_OK;
const gchar *level_name;
guint8 level_idc;
guint32 MaxLumaPs;
} GstH265LevelLimits;
/* *INDENT-OFF* */
/* Table A.8 - General tier and level limits */
static const GstH265LevelLimits level_limits[] = {
/* level idc MaxLumaPs */
{ "1", 30, 36864 },
{ "2", 60, 122880 },
{ "2.1", 63, 245760 },
{ "3", 90, 552960 },
{ "3.1", 93, 983040 },
{ "4", 120, 2228224 },
{ "4.1", 123, 2228224 },
{ "5", 150, 8912896 },
{ "5.1", 153, 8912896 },
{ "5.2", 156, 8912896 },
{ "6", 180, 35651584 },
{ "6.1", 183, 35651584 },
{ "6.2", 186, 35651584 },
};
/* *INDENT-ON* */
static gint
gst_h265_decoder_get_max_dpb_size_from_sps (GstH265Decoder * self,
GstH265SPS * sps)
{
guint i;
guint PicSizeInSamplesY;
/* Default is the worst case level 6.2 */
guint32 MaxLumaPS = G_MAXUINT32;
const gint MaxDpbPicBuf = 6;
gint max_dpb_size;
/* Unknown level */
if (sps->profile_tier_level.level_idc == 0)
return 16;
/* A.4.1 */
MaxLumaPS = 35651584;
PicSizeInSamplesY = sps->width * sps->height;
for (i = 0; i < G_N_ELEMENTS (level_limits); i++) {
if (sps->profile_tier_level.level_idc <= level_limits[i].level_idc) {
if (PicSizeInSamplesY <= level_limits[i].MaxLumaPs) {
MaxLumaPS = level_limits[i].MaxLumaPs;
} else {
GST_DEBUG_OBJECT (self,
"%u (%dx%d) exceeds allowed max luma sample for level \"%s\" %u",
PicSizeInSamplesY, sps->width, sps->height,
level_limits[i].level_name, level_limits[i].MaxLumaPs);
}
break;
}
}
/* Unknown level */
if (MaxLumaPS == G_MAXUINT32)
return 16;
/* A.4.2 */
if (PicSizeInSamplesY <= (MaxLumaPS >> 2))
max_dpb_size = MaxDpbPicBuf * 4;
else if (PicSizeInSamplesY <= (MaxLumaPS >> 1))
@ -450,7 +495,21 @@ gst_h265_decoder_process_sps (GstH265Decoder * self, GstH265SPS * sps)
else
max_dpb_size = MaxDpbPicBuf;
max_dpb_size = MIN (max_dpb_size, 16);
return MIN (max_dpb_size, 16);
}
static GstFlowReturn
gst_h265_decoder_process_sps (GstH265Decoder * self, GstH265SPS * sps)
{
GstH265DecoderPrivate *priv = self->priv;
gint max_dpb_size;
gint prev_max_dpb_size;
guint8 field_seq_flag = 0;
guint8 progressive_source_flag = 0;
guint8 interlaced_source_flag = 0;
GstFlowReturn ret = GST_FLOW_OK;
max_dpb_size = gst_h265_decoder_get_max_dpb_size_from_sps (self, sps);
if (sps->vui_parameters_present_flag)
field_seq_flag = sps->vui_params.field_seq_flag;