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vtenc: Add support for constant bitrate encoding

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Only supported on macOS 13.0+ and iOS 16.0+ on Apple Silicon.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7232>
This commit is contained in:
Nirbheek Chauhan 2024-07-25 04:36:09 +05:30 committed by GStreamer Marge Bot
parent 2e39aefe22
commit 4207b4e281
2 changed files with 65 additions and 2 deletions
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53
subprojects/gst-plugins-bad/sys/applemedia/vtenc.c
View file

@ -192,6 +192,7 @@ enum
PROP_MAX_KEYFRAME_INTERVAL,
PROP_MAX_KEYFRAME_INTERVAL_DURATION,
PROP_PRESERVE_ALPHA,
PROP_RATE_CONTROL,
};
typedef struct _GstVTEncFrame GstVTEncFrame;
@ -263,6 +264,24 @@ static void gst_pixel_buffer_release_cb (void *releaseRefCon,
const void *planeAddresses[]);
#endif
#define GST_TYPE_VTENC_RATE_CONTROL (gst_vtenc_rate_control_get_type())
static GType
gst_vtenc_rate_control_get_type (void)
{
static GType rc_type = 0;
static const GEnumValue rc_types[] = {
{GST_VTENC_RATE_CONTROL_ABR, "Average Bitrate", "abr"},
{GST_VTENC_RATE_CONTROL_CBR, "Constant Bitrate", "cbr"},
{0, NULL, NULL},
};
if (!rc_type) {
rc_type = g_enum_register_static ("GstVtencRateControl", rc_types);
}
return rc_type;
}
static GstStaticCaps sink_caps =
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ AYUV64, UYVY, NV12, I420 }"));
@ -461,6 +480,15 @@ gst_vtenc_class_init (GstVTEncClass * klass)
G_MAXUINT64, VTENC_DEFAULT_MAX_KEYFRAME_INTERVAL_DURATION,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
/**
* Since: 1.26
*/
g_object_class_install_property (gobject_class, PROP_RATE_CONTROL,
g_param_spec_enum ("rate-control", "Rate Control",
"Desired rate control for the encoder", GST_TYPE_VTENC_RATE_CONTROL,
GST_VTENC_RATE_CONTROL_ABR,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
/*
* H264 doesn't support alpha components, and H265 uses a separate element for encoding
* with alpha, so only add the property for prores
@ -625,6 +653,9 @@ gst_vtenc_get_property (GObject * obj, guint prop_id, GValue * value,
case PROP_MAX_KEYFRAME_INTERVAL_DURATION:
g_value_set_uint64 (value, self->max_keyframe_interval_duration);
break;
case PROP_RATE_CONTROL:
g_value_set_enum (value, self->rate_control);
break;
case PROP_PRESERVE_ALPHA:
g_value_set_boolean (value, self->preserve_alpha);
break;
@ -660,6 +691,9 @@ gst_vtenc_set_property (GObject * obj, guint prop_id, const GValue * value,
gst_vtenc_set_max_keyframe_interval_duration (self,
g_value_get_uint64 (value));
break;
case PROP_RATE_CONTROL:
self->rate_control = g_value_get_enum (value);
break;
case PROP_PRESERVE_ALPHA:
self->preserve_alpha = g_value_get_boolean (value);
break;
@ -1640,8 +1674,23 @@ static void
gst_vtenc_session_configure_bitrate (GstVTEnc * self,
VTCompressionSessionRef session, guint bitrate)
{
gst_vtenc_session_configure_property_int (self, session,
kVTCompressionPropertyKey_AverageBitRate, bitrate);
CFStringRef key = kVTCompressionPropertyKey_AverageBitRate;
if (self->rate_control == GST_VTENC_RATE_CONTROL_CBR) {
#ifdef __aarch64__
/*
* In addition to the OS requirements, CBR also requires Apple Silicon
*/
if (__builtin_available (macOS 13.0, iOS 16.0, *)) {
key = kVTCompressionPropertyKey_ConstantBitRate;
} else
#endif
{
GST_WARNING_OBJECT (self, "CBR is unsupported on your system, using ABR");
}
}
gst_vtenc_session_configure_property_int (self, session, key, bitrate);
}
static void

14
subprojects/gst-plugins-bad/sys/applemedia/vtenc.h
View file

@ -34,6 +34,19 @@ G_BEGIN_DECLS
((const GstVTEncoderDetails *) g_type_get_qdata (G_OBJECT_CLASS_TYPE (klass), \
GST_VTENC_CODEC_DETAILS_QDATA))
/**
* GstVtencRateControl:
* @GST_VTENC_RATE_CONTROL_ABR: average (variable) bitrate
* @GST_VTENC_RATE_CONTROL_CBR: constant bitrate
*
* Since: 1.26
*/
typedef enum
{
GST_VTENC_RATE_CONTROL_ABR,
GST_VTENC_RATE_CONTROL_CBR,
} GstVtencRateControl;
typedef struct _GstVTEncoderDetails GstVTEncoderDetails;
typedef struct _GstVTEncClassParams GstVTEncClassParams;
@ -71,6 +84,7 @@ struct _GstVTEnc
GstClockTime max_keyframe_interval_duration;
gint latency_frames;
gboolean preserve_alpha;
GstVtencRateControl rate_control;
gboolean dump_properties;
gboolean dump_attributes;