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gstreamer/subprojects/gst-plugins-bad/sys/applemedia/vtenc.c
Nirbheek Chauhan 4207b4e281 vtenc: Add support for constant bitrate encoding 
Only supported on macOS 13.0+ and iOS 16.0+ on Apple Silicon.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7232>
2024-07-30 12:42:17 +00:00

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/*
* Copyright (C) 2010, 2013 Ole André Vadla Ravnås <oleavr@soundrop.com>
* Copyright (C) 2013 Intel Corporation
*
* 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 the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-vtenc_h264
* @title: vtenc_h264
*
* Apple VideoToolbox H264 encoder, which can either use HW or a SW
* implementation depending on the device.
*
* ## Example pipeline
* |[
* gst-launch-1.0 -v videotestsrc ! vtenc_h264 ! qtmux ! filesink location=out.mov
* ]| Encode a test video pattern and save it as an MOV file
*
*/
/**
* SECTION:element-vtenc_h264_hw
* @title: vtenc_h264_hw
*
* Apple VideoToolbox H264 HW-only encoder (only available on macOS at
* present).
*
* ## Example pipeline
* |[
* gst-launch-1.0 -v videotestsrc ! vtenc_h264_hw ! qtmux ! filesink location=out.mov
* ]| Encode a test video pattern and save it as an MOV file
*
*/
/**
* SECTION:element-vtenc_prores
* @title: vtenc_prores
*
* Apple VideoToolbox ProRes encoder
*
* ## Example pipeline
* |[
* gst-launch-1.0 -v videotestsrc ! vtenc_prores ! qtmux ! filesink location=out.mov
* ]| Encode a test video pattern and save it as an MOV file
*
* Since: 1.20
*/
/**
* SECTION:element-vtenc_h265
* @title: vtenc_h265
*
* Apple VideoToolbox H265 encoder, which can either use HW or a SW
* implementation depending on the device.
*
* ## Example pipeline
* |[
* gst-launch-1.0 -v videotestsrc ! vtenc_h265 ! qtmux ! filesink location=out.mov
* ]| Encode a test video pattern and save it as an MOV file
*
* Since: 1.22
*/
/**
* SECTION:element-vtenc_h265_hw
* @title: vtenc_h265_hw
*
* Apple VideoToolbox H265 HW-only encoder (only available on macOS at
* present).
*
* ## Example pipeline
* |[
* gst-launch-1.0 -v videotestsrc ! vtenc_h265_hw ! qtmux ! filesink location=out.mov
* ]| Encode a test video pattern and save it as an MOV file
*
* Since: 1.22
*/
/**
* SECTION:element-vtenc_h265a
* @title: vtenc_h265a
*
* Apple VideoToolbox H265 encoder with alpha channel support.
* This encoder can either use HW or a SW implementation depending on the device.
*
* ## Example pipeline (assuming a PNG with an alpha channel as input)
* |[
* gst-launch-1.0 -v filesrc location=test.png ! pngdec ! imagefreeze num-buffers=1000 ! videoconvert ! vtenc_h265a ! qtmux ! filesink location=out.mov
* ]| Encode 1000 frames of a PNG image with an alpha channel and save it as an MOV file.
*
* Since: 1.26
*/
/**
* SECTION:element-vtenc_h265a_hw
* @title: vtenc_h265a_hw
*
* Apple VideoToolbox H265 HW-only encoder with alpha channel support.
* Currently only available on macOS.
*
* ## Example pipeline (assuming a PNG with an alpha channel as input)
* |[
* gst-launch-1.0 -v filesrc location=test.png ! pngdec ! imagefreeze num-buffers=1000 ! videoconvert ! vtenc_h265a ! qtmux ! filesink location=out.mov
* ]| Encode 1000 frames of a PNG image with an alpha channel and save it as an MOV file.
*
* Since: 1.26
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "vtenc.h"
#include "coremediabuffer.h"
#include "corevideobuffer.h"
#include "vtutil.h"
#include "helpers.h"
#include <gst/pbutils/codec-utils.h>
#include <sys/sysctl.h>
#define VTENC_DEFAULT_BITRATE 0
#define VTENC_DEFAULT_FRAME_REORDERING TRUE
#define VTENC_DEFAULT_REALTIME FALSE
#define VTENC_DEFAULT_QUALITY 0.5
#define VTENC_DEFAULT_MAX_KEYFRAME_INTERVAL 0
#define VTENC_DEFAULT_MAX_KEYFRAME_INTERVAL_DURATION 0
#define VTENC_DEFAULT_PRESERVE_ALPHA TRUE
#define VTENC_OUTPUT_QUEUE_SIZE 3
#define VTENC_HEVCALPHA_INPUT_LIMIT 5
GST_DEBUG_CATEGORY (gst_vtenc_debug);
#define GST_CAT_DEFAULT (gst_vtenc_debug)
#define GST_VTENC_CODEC_DETAILS_QDATA \
g_quark_from_static_string ("vtenc-codec-details")
#define CMTIME_TO_GST_CLOCK_TIME(time) time.value / (time.timescale / GST_SECOND)
/* define EnableHardwareAcceleratedVideoEncoder in < 10.9 */
#if defined(MAC_OS_X_VERSION_MAX_ALLOWED) && MAC_OS_X_VERSION_MAX_ALLOWED < 1090
const CFStringRef
kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder =
CFSTR ("EnableHardwareAcceleratedVideoEncoder");
const CFStringRef
kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder =
CFSTR ("RequireHardwareAcceleratedVideoEncoder");
const CFStringRef kVTCompressionPropertyKey_ProfileLevel =
CFSTR ("ProfileLevel");
const CFStringRef kVTProfileLevel_H264_Baseline_AutoLevel =
CFSTR ("H264_Baseline_AutoLevel");
#endif
#if defined(MAC_OS_X_VERSION_MAX_ALLOWED) && MAC_OS_X_VERSION_MAX_ALLOWED < 1080
const CFStringRef kVTCompressionPropertyKey_Quality = CFSTR ("Quality");
#endif
#ifdef HAVE_VIDEOTOOLBOX_10_9_6
extern OSStatus
VTCompressionSessionPrepareToEncodeFrames (VTCompressionSessionRef session)
__attribute__((weak_import));
#endif
/* This property key is currently completely undocumented. The only way you can
* know about its existence is if Apple tells you. It allows you to tell the
* encoder to not preserve alpha even when outputting alpha formats. */
const CFStringRef gstVTCodecPropertyKey_PreserveAlphaChannel =
CFSTR ("kVTCodecPropertyKey_PreserveAlphaChannel");
enum
{
PROP_0,
PROP_USAGE,
PROP_BITRATE,
PROP_ALLOW_FRAME_REORDERING,
PROP_REALTIME,
PROP_QUALITY,
PROP_MAX_KEYFRAME_INTERVAL,
PROP_MAX_KEYFRAME_INTERVAL_DURATION,
PROP_PRESERVE_ALPHA,
PROP_RATE_CONTROL,
};
typedef struct _GstVTEncFrame GstVTEncFrame;
struct _GstVTEncFrame
{
GstBuffer *buf;
GstVideoFrame videoframe;
};
static GstElementClass *parent_class = NULL;
static void gst_vtenc_get_property (GObject * obj, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_vtenc_set_property (GObject * obj, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_vtenc_finalize (GObject * obj);
static gboolean gst_vtenc_start (GstVideoEncoder * enc);
static gboolean gst_vtenc_stop (GstVideoEncoder * enc);
static void gst_vtenc_loop (GstVTEnc * self);
static gboolean gst_vtenc_set_format (GstVideoEncoder * enc,
GstVideoCodecState * input_state);
static GstFlowReturn gst_vtenc_handle_frame (GstVideoEncoder * enc,
GstVideoCodecFrame * frame);
static GstStateChangeReturn gst_vtenc_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_vtenc_finish (GstVideoEncoder * enc);
static gboolean gst_vtenc_flush (GstVideoEncoder * enc);
static gboolean gst_vtenc_sink_event (GstVideoEncoder * enc, GstEvent * event);
static VTCompressionSessionRef gst_vtenc_create_session (GstVTEnc * self);
static void gst_vtenc_destroy_session (GstVTEnc * self,
VTCompressionSessionRef * session);
static void gst_vtenc_session_dump_properties (GstVTEnc * self,
VTCompressionSessionRef session);
static void gst_vtenc_session_configure_expected_framerate (GstVTEnc * self,
VTCompressionSessionRef session, gdouble framerate);
static void gst_vtenc_session_configure_max_keyframe_interval (GstVTEnc * self,
VTCompressionSessionRef session, gint interval);
static void gst_vtenc_session_configure_max_keyframe_interval_duration
(GstVTEnc * self, VTCompressionSessionRef session, gdouble duration);
static void gst_vtenc_session_configure_bitrate (GstVTEnc * self,
VTCompressionSessionRef session, guint bitrate);
static OSStatus gst_vtenc_session_configure_property_int (GstVTEnc * self,
VTCompressionSessionRef session, CFStringRef name, gint value);
static OSStatus gst_vtenc_session_configure_property_double (GstVTEnc * self,
VTCompressionSessionRef session, CFStringRef name, gdouble value);
static void gst_vtenc_session_configure_allow_frame_reordering (GstVTEnc * self,
VTCompressionSessionRef session, gboolean allow_frame_reordering);
static void gst_vtenc_session_configure_realtime (GstVTEnc * self,
VTCompressionSessionRef session, gboolean realtime);
static GstFlowReturn gst_vtenc_encode_frame (GstVTEnc * self,
GstVideoCodecFrame * frame);
static void gst_vtenc_enqueue_buffer (void *outputCallbackRefCon,
void *sourceFrameRefCon, OSStatus status, VTEncodeInfoFlags infoFlags,
CMSampleBufferRef sampleBuffer);
static gboolean gst_vtenc_buffer_is_keyframe (GstVTEnc * self,
CMSampleBufferRef sbuf);
#ifndef HAVE_IOS
static GstVTEncFrame *gst_vtenc_frame_new (GstBuffer * buf,
GstVideoInfo * videoinfo);
static void gst_vtenc_frame_free (GstVTEncFrame * frame);
static void gst_pixel_buffer_release_cb (void *releaseRefCon,
const void *dataPtr, size_t dataSize, size_t numberOfPlanes,
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 }"));
static void
gst_vtenc_base_init (GstVTEncClass * klass)
{
const GstVTEncoderDetails *codec_details =
GST_VTENC_CLASS_GET_CODEC_DETAILS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
const int min_width = 1, max_width = G_MAXINT;
const int min_height = 1, max_height = G_MAXINT;
const int min_fps_n = 0, max_fps_n = G_MAXINT;
const int min_fps_d = 1, max_fps_d = 1;
GstCaps *src_caps;
gchar *longname, *description;
longname = g_strdup_printf ("%s encoder", codec_details->name);
description = g_strdup_printf ("%s encoder", codec_details->name);
gst_element_class_set_metadata (element_class, longname,
"Codec/Encoder/Video/Hardware", description,
"Ole André Vadla Ravnås <oleavr@soundrop.com>, Dominik Röttsches <dominik.rottsches@intel.com>");
g_free (longname);
g_free (description);
{
GstCaps *caps = gst_static_caps_get (&sink_caps);
#ifndef HAVE_IOS
gboolean enable_argb = TRUE;
int retval;
char cpu_name[30];
size_t cpu_len = 30;
if (__builtin_available (macOS 13.0, *)) {
/* Can't negate a __builtin_available check */
} else {
/* Disable ARGB64/RGBA64 if we're on M1 Pro/Max and macOS < 13.0
* due to a bug within VideoToolbox which causes encoding to fail. */
retval = sysctlbyname ("machdep.cpu.brand_string", &cpu_name, &cpu_len,
NULL, 0);
if (retval == 0 &&
(strstr (cpu_name, "M1 Pro") != NULL ||
strstr (cpu_name, "M1 Max") != NULL)) {
GST_WARNING
("Disabling ARGB64/RGBA64 caps due to a bug in VideoToolbox "
"on M1 Pro/Max running macOS < 13.0.");
enable_argb = FALSE;
}
}
if (enable_argb) {
caps = gst_vtutil_caps_append_video_format (caps, "ARGB64_BE");
/* RGBA64_LE is kCVPixelFormatType_64RGBALE, only available on macOS 11.3+ */
if (GST_APPLEMEDIA_HAVE_64RGBALE)
caps = gst_vtutil_caps_append_video_format (caps, "RGBA64_LE");
}
#endif
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, caps));
}
src_caps = gst_caps_new_simple (codec_details->mimetype,
"width", GST_TYPE_INT_RANGE, min_width, max_width,
"height", GST_TYPE_INT_RANGE, min_height, max_height,
"framerate", GST_TYPE_FRACTION_RANGE,
min_fps_n, min_fps_d, max_fps_n, max_fps_d, NULL);
/* Signal our limited interlace support */
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
GValueArray *arr = g_value_array_new (2);
GValue val = G_VALUE_INIT;
g_value_init (&val, G_TYPE_STRING);
g_value_set_string (&val, "progressive");
arr = g_value_array_append (arr, &val);
g_value_set_string (&val, "interleaved");
arr = g_value_array_append (arr, &val);
G_GNUC_END_IGNORE_DEPRECATIONS;
gst_structure_set_list (gst_caps_get_structure (src_caps, 0),
"interlace-mode", arr);
}
switch (codec_details->format_id) {
case kCMVideoCodecType_H264:
gst_structure_set (gst_caps_get_structure (src_caps, 0),
"stream-format", G_TYPE_STRING, "avc",
"alignment", G_TYPE_STRING, "au", NULL);
break;
case kCMVideoCodecType_HEVC:
case kCMVideoCodecType_HEVCWithAlpha:
gst_structure_set (gst_caps_get_structure (src_caps, 0),
"stream-format", G_TYPE_STRING, "hvc1",
"alignment", G_TYPE_STRING, "au", NULL);
break;
case GST_kCMVideoCodecType_Some_AppleProRes:
if (g_strcmp0 (codec_details->mimetype, "video/x-prores") == 0) {
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
GValueArray *arr = g_value_array_new (6);
GValue val = G_VALUE_INIT;
g_value_init (&val, G_TYPE_STRING);
g_value_set_string (&val, "standard");
arr = g_value_array_append (arr, &val);
g_value_set_string (&val, "4444xq");
arr = g_value_array_append (arr, &val);
g_value_set_string (&val, "4444");
arr = g_value_array_append (arr, &val);
g_value_set_string (&val, "hq");
arr = g_value_array_append (arr, &val);
g_value_set_string (&val, "lt");
arr = g_value_array_append (arr, &val);
g_value_set_string (&val, "proxy");
arr = g_value_array_append (arr, &val);
gst_structure_set_list (gst_caps_get_structure (src_caps, 0),
"variant", arr);
g_value_array_free (arr);
g_value_unset (&val);
G_GNUC_END_IGNORE_DEPRECATIONS;
break;
}
/* fall through */
default:
g_assert_not_reached ();
}
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, src_caps));
gst_caps_unref (src_caps);
}
static void
gst_vtenc_class_init (GstVTEncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstVideoEncoderClass *gstvideoencoder_class;
gobject_class = (GObjectClass *) klass;
element_class = (GstElementClass *) klass;
gstvideoencoder_class = (GstVideoEncoderClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->get_property = gst_vtenc_get_property;
gobject_class->set_property = gst_vtenc_set_property;
gobject_class->finalize = gst_vtenc_finalize;
element_class->change_state = GST_DEBUG_FUNCPTR (gst_vtenc_change_state);
gstvideoencoder_class->start = gst_vtenc_start;
gstvideoencoder_class->stop = gst_vtenc_stop;
gstvideoencoder_class->set_format = gst_vtenc_set_format;
gstvideoencoder_class->handle_frame = gst_vtenc_handle_frame;
gstvideoencoder_class->finish = gst_vtenc_finish;
gstvideoencoder_class->flush = gst_vtenc_flush;
gstvideoencoder_class->sink_event = gst_vtenc_sink_event;
g_object_class_install_property (gobject_class, PROP_BITRATE,
g_param_spec_uint ("bitrate", "Bitrate",
"Target video bitrate in kbps (0 = auto)",
0, G_MAXUINT, VTENC_DEFAULT_BITRATE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ALLOW_FRAME_REORDERING,
g_param_spec_boolean ("allow-frame-reordering", "Allow frame reordering",
"Whether to allow frame reordering or not",
VTENC_DEFAULT_FRAME_REORDERING,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_REALTIME,
g_param_spec_boolean ("realtime", "Realtime",
"Configure the encoder for realtime output",
VTENC_DEFAULT_REALTIME,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_QUALITY,
g_param_spec_double ("quality", "Quality",
"The desired compression quality",
0.0, 1.0, VTENC_DEFAULT_QUALITY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_KEYFRAME_INTERVAL,
g_param_spec_int ("max-keyframe-interval", "Max Keyframe Interval",
"Maximum number of frames between keyframes (0 = auto)",
0, G_MAXINT, VTENC_DEFAULT_MAX_KEYFRAME_INTERVAL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_MAX_KEYFRAME_INTERVAL_DURATION,
g_param_spec_uint64 ("max-keyframe-interval-duration",
"Max Keyframe Interval Duration",
"Maximum number of nanoseconds between keyframes (0 = no limit)", 0,
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
*/
if (g_strcmp0 (G_OBJECT_CLASS_NAME (klass), "vtenc_prores") == 0) {
/**
* vtenc_prores:preserve-alpha
*
* Preserve non-opaque video alpha values from the input video when
* compressing, else treat all alpha component as opaque.
*
* Since: 1.20
*/
g_object_class_install_property (gobject_class, PROP_PRESERVE_ALPHA,
g_param_spec_boolean ("preserve-alpha", "Preserve Video Alpha Values",
"Video alpha values (non opaque) need to be preserved",
VTENC_DEFAULT_PRESERVE_ALPHA,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
}
}
static void
gst_vtenc_init (GstVTEnc * self)
{
GstVTEncClass *klass = (GstVTEncClass *) G_OBJECT_GET_CLASS (self);
CFStringRef keyframe_props_keys[] = { kVTEncodeFrameOptionKey_ForceKeyFrame };
CFBooleanRef keyframe_props_values[] = { kCFBooleanTrue };
self->details = GST_VTENC_CLASS_GET_CODEC_DETAILS (klass);
/* These could be controlled by properties later */
self->dump_properties = FALSE;
self->dump_attributes = FALSE;
self->latency_frames = -1;
self->session = NULL;
self->profile_level = NULL;
self->have_field_order = TRUE;
self->keyframe_props =
CFDictionaryCreate (NULL, (const void **) keyframe_props_keys,
(const void **) keyframe_props_values, G_N_ELEMENTS (keyframe_props_keys),
&kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
g_mutex_init (&self->queue_mutex);
g_cond_init (&self->queue_cond);
g_mutex_init (&self->encoding_mutex);
g_cond_init (&self->encoding_cond);
}
static void
gst_vtenc_finalize (GObject * obj)
{
GstVTEnc *self = GST_VTENC_CAST (obj);
CFRelease (self->keyframe_props);
g_mutex_clear (&self->queue_mutex);
g_cond_clear (&self->queue_cond);
g_mutex_clear (&self->encoding_mutex);
g_cond_clear (&self->encoding_cond);
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gst_vtenc_set_bitrate (GstVTEnc * self, guint bitrate)
{
GST_OBJECT_LOCK (self);
self->bitrate = bitrate;
if (self->session != NULL)
gst_vtenc_session_configure_bitrate (self, self->session, bitrate);
GST_OBJECT_UNLOCK (self);
}
static void
gst_vtenc_set_allow_frame_reordering (GstVTEnc * self,
gboolean allow_frame_reordering)
{
GST_OBJECT_LOCK (self);
self->allow_frame_reordering = allow_frame_reordering;
if (self->session != NULL) {
gst_vtenc_session_configure_allow_frame_reordering (self,
self->session, allow_frame_reordering);
}
GST_OBJECT_UNLOCK (self);
}
static void
gst_vtenc_set_realtime (GstVTEnc * self, gboolean realtime)
{
GST_OBJECT_LOCK (self);
self->realtime = realtime;
if (self->session != NULL)
gst_vtenc_session_configure_realtime (self, self->session, realtime);
GST_OBJECT_UNLOCK (self);
}
static void
gst_vtenc_set_quality (GstVTEnc * self, gdouble quality)
{
GST_OBJECT_LOCK (self);
self->quality = quality;
if (self->session != NULL) {
GST_INFO_OBJECT (self, "setting quality %f", quality);
gst_vtenc_session_configure_property_double (self, self->session,
kVTCompressionPropertyKey_Quality, quality);
}
GST_OBJECT_UNLOCK (self);
}
static void
gst_vtenc_set_max_keyframe_interval (GstVTEnc * self, gint interval)
{
GST_OBJECT_LOCK (self);
self->max_keyframe_interval = interval;
if (self->session != NULL) {
gst_vtenc_session_configure_max_keyframe_interval (self, self->session,
interval);
}
GST_OBJECT_UNLOCK (self);
}
static void
gst_vtenc_set_max_keyframe_interval_duration (GstVTEnc * self,
GstClockTime interval)
{
GST_OBJECT_LOCK (self);
self->max_keyframe_interval_duration = interval;
if (self->session != NULL) {
gst_vtenc_session_configure_max_keyframe_interval_duration (self,
self->session, interval / ((gdouble) GST_SECOND));
}
GST_OBJECT_UNLOCK (self);
}
static void
gst_vtenc_get_property (GObject * obj, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVTEnc *self = GST_VTENC_CAST (obj);
switch (prop_id) {
case PROP_BITRATE:
g_value_set_uint (value, self->bitrate / 1000);
break;
case PROP_ALLOW_FRAME_REORDERING:
g_value_set_boolean (value, self->allow_frame_reordering);
break;
case PROP_REALTIME:
g_value_set_boolean (value, self->realtime);
break;
case PROP_QUALITY:
g_value_set_double (value, self->quality);
break;
case PROP_MAX_KEYFRAME_INTERVAL:
g_value_set_int (value, self->max_keyframe_interval);
break;
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, prop_id, pspec);
break;
}
}
static void
gst_vtenc_set_property (GObject * obj, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstVTEnc *self = GST_VTENC_CAST (obj);
switch (prop_id) {
case PROP_BITRATE:
gst_vtenc_set_bitrate (self, g_value_get_uint (value) * 1000);
break;
case PROP_ALLOW_FRAME_REORDERING:
gst_vtenc_set_allow_frame_reordering (self, g_value_get_boolean (value));
break;
case PROP_REALTIME:
gst_vtenc_set_realtime (self, g_value_get_boolean (value));
break;
case PROP_QUALITY:
gst_vtenc_set_quality (self, g_value_get_double (value));
break;
case PROP_MAX_KEYFRAME_INTERVAL:
gst_vtenc_set_max_keyframe_interval (self, g_value_get_int (value));
break;
case PROP_MAX_KEYFRAME_INTERVAL_DURATION:
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, prop_id, pspec);
break;
}
}
static gboolean
gst_vtenc_ensure_output_loop (GstVTEnc * self)
{
GstPad *pad = GST_VIDEO_ENCODER_SRC_PAD (self);
GstTask *task = GST_PAD_TASK (pad);
return gst_task_resume (task);
}
static void
gst_vtenc_pause_output_loop (GstVTEnc * self)
{
g_mutex_lock (&self->queue_mutex);
self->pause_task = TRUE;
g_cond_signal (&self->queue_cond);
g_mutex_unlock (&self->queue_mutex);
gst_pad_pause_task (GST_VIDEO_ENCODER_SRC_PAD (self));
GST_DEBUG_OBJECT (self, "paused output thread");
g_mutex_lock (&self->queue_mutex);
self->pause_task = FALSE;
g_mutex_unlock (&self->queue_mutex);
}
static void
gst_vtenc_set_flushing_flag (GstVTEnc * self)
{
g_mutex_lock (&self->queue_mutex);
self->is_flushing = TRUE;
g_cond_signal (&self->queue_cond);
g_mutex_unlock (&self->queue_mutex);
}
static GstFlowReturn
gst_vtenc_finish_encoding (GstVTEnc * self, gboolean is_flushing)
{
GST_DEBUG_OBJECT (self,
"complete encoding and clean buffer queue, is flushing %d", is_flushing);
OSStatus vt_status;
/* In case of EOS before the first buffer/caps */
if (self->session == NULL)
return GST_FLOW_OK;
/* If output loop failed to push things downstream */
if (self->downstream_ret != GST_FLOW_OK
&& self->downstream_ret != GST_FLOW_FLUSHING) {
/* Tells enqueue_buffer() to instantly discard any new encoded frames */
gst_vtenc_set_flushing_flag (self);
GST_WARNING_OBJECT (self, "Output loop stopped with error (%s), leaving",
gst_flow_get_name (self->downstream_ret));
return self->downstream_ret;
}
if (is_flushing)
gst_vtenc_set_flushing_flag (self);
if (!gst_vtenc_ensure_output_loop (self)) {
GST_ERROR_OBJECT (self, "Output loop failed to resume");
return GST_FLOW_ERROR;
}
/* We need to unlock the stream lock here because
* it can wait for gst_vtenc_enqueue_buffer() to
* handle a buffer... which will take the stream
* lock from another thread and then deadlock */
GST_VIDEO_ENCODER_STREAM_UNLOCK (self);
GST_DEBUG_OBJECT (self, "starting VTCompressionSessionCompleteFrames");
vt_status =
VTCompressionSessionCompleteFrames (self->session,
kCMTimePositiveInfinity);
GST_DEBUG_OBJECT (self, "VTCompressionSessionCompleteFrames ended");
if (vt_status != noErr) {
GST_WARNING_OBJECT (self, "VTCompressionSessionCompleteFrames returned %d",
(int) vt_status);
}
gst_vtenc_pause_output_loop (self);
GST_VIDEO_ENCODER_STREAM_LOCK (self);
if (self->downstream_ret == GST_FLOW_OK)
GST_DEBUG_OBJECT (self, "buffer queue cleaned");
else
GST_DEBUG_OBJECT (self,
"buffer queue not cleaned, output thread returned %s",
gst_flow_get_name (self->downstream_ret));
return self->downstream_ret;
}
static gboolean
gst_vtenc_start (GstVideoEncoder * enc)
{
GstVTEnc *self = GST_VTENC_CAST (enc);
/* DTS can be negative if b-frames are enabled */
gst_video_encoder_set_min_pts (enc, GST_SECOND * 60 * 60 * 1000);
self->is_flushing = FALSE;
self->downstream_ret = GST_FLOW_OK;
self->output_queue = gst_vec_deque_new (VTENC_OUTPUT_QUEUE_SIZE);
/* Set clear_func to unref all remaining frames in gst_vec_deque_free() */
gst_vec_deque_set_clear_func (self->output_queue,
(GDestroyNotify) gst_video_codec_frame_unref);
/* Create the output task, but pause it immediately */
self->pause_task = TRUE;
if (!gst_pad_start_task (GST_VIDEO_ENCODER_SRC_PAD (enc),
(GstTaskFunction) gst_vtenc_loop, self, NULL)) {
GST_ERROR_OBJECT (self, "failed to start output thread");
return FALSE;
}
/* This blocks until the loop actually pauses */
gst_pad_pause_task (GST_VIDEO_ENCODER_SRC_PAD (enc));
self->pause_task = FALSE;
return TRUE;
}
static gboolean
gst_vtenc_stop (GstVideoEncoder * enc)
{
GstVTEnc *self = GST_VTENC_CAST (enc);
GST_VIDEO_ENCODER_STREAM_LOCK (self);
gst_vtenc_flush (enc);
self->downstream_ret = GST_FLOW_FLUSHING;
GST_VIDEO_ENCODER_STREAM_UNLOCK (self);
gst_pad_stop_task (GST_VIDEO_ENCODER_SRC_PAD (enc));
GST_OBJECT_LOCK (self);
gst_vtenc_destroy_session (self, &self->session);
GST_OBJECT_UNLOCK (self);
self->negotiate_downstream = TRUE;
self->is_flushing = TRUE;
if (self->profile_level)
CFRelease (self->profile_level);
self->profile_level = NULL;
if (self->input_state)
gst_video_codec_state_unref (self->input_state);
self->input_state = NULL;
self->video_info.width = self->video_info.height = 0;
self->video_info.fps_n = self->video_info.fps_d = 0;
gst_vec_deque_free (self->output_queue);
self->output_queue = NULL;
return TRUE;
}
static gboolean
gst_vtenc_h264_parse_profile_level_key (GstVTEnc * self, const gchar * profile,
const gchar * level_arg)
{
char level[64];
gchar *key = NULL;
if (profile == NULL)
profile = "main";
if (level_arg == NULL)
level_arg = "AutoLevel";
strncpy (level, level_arg, sizeof (level));
if (!strcmp (profile, "constrained-baseline") ||
!strcmp (profile, "baseline")) {
profile = "Baseline";
self->h264_profile = GST_H264_PROFILE_BASELINE;
} else if (g_str_has_prefix (profile, "high")) {
profile = "High";
self->h264_profile = GST_H264_PROFILE_HIGH;
} else if (!strcmp (profile, "main")) {
profile = "Main";
self->h264_profile = GST_H264_PROFILE_MAIN;
} else {
GST_ERROR_OBJECT (self, "invalid profile: %s", profile);
return FALSE;
}
if (strlen (level) == 1) {
level[1] = '_';
level[2] = '0';
} else if (strlen (level) == 3) {
level[1] = '_';
}
key = g_strdup_printf ("H264_%s_%s", profile, level);
self->profile_level =
CFStringCreateWithBytes (NULL, (const guint8 *) key, strlen (key),
kCFStringEncodingASCII, 0);
GST_INFO_OBJECT (self, "negotiated profile and level %s", key);
g_free (key);
return TRUE;
}
static gboolean
gst_vtenc_hevc_parse_profile_level_key (GstVTEnc * self, const gchar * profile,
const gchar * level_arg)
{
gchar *key = NULL;
if (profile == NULL || !strcmp (profile, "main"))
profile = "Main";
else if (!strcmp (profile, "main-10"))
profile = "Main10";
else if (!strcmp (profile, "main-422-10"))
/* TODO: this should probably be guarded with a version check (macOS 12.3+ / iOS 15.4+)
* https://developer.apple.com/documentation/videotoolbox/kvtprofilelevel_hevc_main10_autolevel */
profile = "Main42210";
else {
GST_ERROR_OBJECT (self, "invalid profile: %s", profile);
return FALSE;
}
/* VT does not support specific levels for HEVC */
key = g_strdup_printf ("HEVC_%s_AutoLevel", profile);
self->profile_level =
CFStringCreateWithBytes (NULL, (const guint8 *) key, strlen (key),
kCFStringEncodingASCII, 0);
GST_INFO_OBJECT (self, "negotiated profile and level %s", key);
g_free (key);
return TRUE;
}
static gboolean
gst_vtenc_negotiate_profile_and_level (GstVTEnc * self, GstStructure * s)
{
const gchar *profile = gst_structure_get_string (s, "profile");
const gchar *level = gst_structure_get_string (s, "level");
if (self->profile_level)
CFRelease (self->profile_level);
if (self->specific_format_id == kCMVideoCodecType_HEVC ||
self->specific_format_id == kCMVideoCodecType_HEVCWithAlpha) {
return gst_vtenc_hevc_parse_profile_level_key (self, profile, level);
} else {
return gst_vtenc_h264_parse_profile_level_key (self, profile, level);
}
}
static gboolean
gst_vtenc_negotiate_prores_variant (GstVTEnc * self, GstStructure * s)
{
const char *variant = gst_structure_get_string (s, "variant");
CMVideoCodecType codec_type =
gst_vtutil_codec_type_from_prores_variant (variant);
if (codec_type == GST_kCMVideoCodecType_Some_AppleProRes) {
GST_ERROR_OBJECT (self, "unsupported prores variant: %s", variant);
return FALSE;
}
self->specific_format_id = codec_type;
return TRUE;
}
static gboolean
gst_vtenc_negotiate_specific_format_details (GstVideoEncoder * enc)
{
GstVTEnc *self = GST_VTENC_CAST (enc);
GstCaps *allowed_caps = NULL;
gboolean ret = TRUE;
allowed_caps = gst_pad_get_allowed_caps (GST_VIDEO_ENCODER_SRC_PAD (enc));
if (allowed_caps) {
GstStructure *s;
if (gst_caps_is_empty (allowed_caps)) {
GST_ERROR_OBJECT (self, "no allowed downstream caps");
goto fail;
}
allowed_caps = gst_caps_make_writable (allowed_caps);
allowed_caps = gst_caps_fixate (allowed_caps);
s = gst_caps_get_structure (allowed_caps, 0);
switch (self->details->format_id) {
case kCMVideoCodecType_H264:
self->specific_format_id = kCMVideoCodecType_H264;
if (!gst_vtenc_negotiate_profile_and_level (self, s))
goto fail;
break;
case kCMVideoCodecType_HEVC:
self->specific_format_id = kCMVideoCodecType_HEVC;
if (!gst_vtenc_negotiate_profile_and_level (self, s))
goto fail;
break;
case kCMVideoCodecType_HEVCWithAlpha:
self->specific_format_id = kCMVideoCodecType_HEVCWithAlpha;
if (!gst_vtenc_negotiate_profile_and_level (self, s))
goto fail;
break;
case GST_kCMVideoCodecType_Some_AppleProRes:
if (g_strcmp0 (self->details->mimetype, "video/x-prores") != 0) {
GST_ERROR_OBJECT (self, "format_id == %i mimetype must be Apple "
"ProRes", GST_kCMVideoCodecType_Some_AppleProRes);
goto fail;
}
if (!gst_vtenc_negotiate_prores_variant (self, s))
goto fail;
break;
default:
g_assert_not_reached ();
}
}
out:
if (allowed_caps)
gst_caps_unref (allowed_caps);
return ret;
fail:
ret = FALSE;
goto out;
}
static gboolean
gst_vtenc_set_format (GstVideoEncoder * enc, GstVideoCodecState * state)
{
GstVTEnc *self = GST_VTENC_CAST (enc);
VTCompressionSessionRef session;
if (self->input_state) {
gst_vtenc_finish_encoding (self, FALSE);
gst_video_codec_state_unref (self->input_state);
}
GST_OBJECT_LOCK (self);
gst_vtenc_destroy_session (self, &self->session);
GST_OBJECT_UNLOCK (self);
self->input_state = gst_video_codec_state_ref (state);
self->video_info = state->info;
if (!gst_vtenc_negotiate_specific_format_details (enc))
return FALSE;
self->negotiate_downstream = TRUE;
session = gst_vtenc_create_session (self);
GST_OBJECT_LOCK (self);
self->session = session;
GST_OBJECT_UNLOCK (self);
return session != NULL;
}
static gboolean
gst_vtenc_is_negotiated (GstVTEnc * self)
{
return self->session && self->video_info.width != 0;
}
/*
* When the image is opaque but the output ProRes format has an alpha
* component (4 component, 32 bits per pixel), Apple requires that we signal
* that it should be ignored by setting the depth to 24 bits per pixel. Not
* doing so causes the encoded files to fail validation.
*
* So we set that in the caps and qtmux sets the depth value in the container,
* which will be read by demuxers so that decoders can skip those bytes
* entirely. qtdemux does this, but vtdec does not use this information at
* present.
*/
static gboolean
gst_vtenc_signal_ignored_alpha_component (GstVTEnc * self)
{
if (self->preserve_alpha)
return FALSE;
if (self->specific_format_id == kCMVideoCodecType_AppleProRes4444XQ ||
self->specific_format_id == kCMVideoCodecType_AppleProRes4444)
return TRUE;
return FALSE;
}
static gboolean
gst_vtenc_negotiate_downstream (GstVTEnc * self, CMSampleBufferRef sbuf)
{
gboolean result;
GstCaps *caps;
GstStructure *s;
GstVideoCodecState *state;
caps = gst_pad_get_pad_template_caps (GST_VIDEO_ENCODER_SRC_PAD (self));
caps = gst_caps_make_writable (caps);
s = gst_caps_get_structure (caps, 0);
gst_structure_set (s,
"width", G_TYPE_INT, self->video_info.width,
"height", G_TYPE_INT, self->video_info.height,
"framerate", GST_TYPE_FRACTION,
self->video_info.fps_n, self->video_info.fps_d, NULL);
switch (self->details->format_id) {
case kCMVideoCodecType_H264:
case kCMVideoCodecType_HEVC:
case kCMVideoCodecType_HEVCWithAlpha:
{
CMFormatDescriptionRef fmt;
CFDictionaryRef atoms;
CFStringRef boxKey;
CFDataRef box;
guint8 *codec_data;
gsize codec_data_size;
GstBuffer *codec_data_buf;
guint8 sps[12];
fmt = CMSampleBufferGetFormatDescription (sbuf);
atoms = CMFormatDescriptionGetExtension (fmt,
kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms);
if (self->details->format_id == kCMVideoCodecType_HEVC ||
self->details->format_id == kCMVideoCodecType_HEVCWithAlpha)
boxKey =
CFStringCreateWithCString (NULL, "hvcC", kCFStringEncodingUTF8);
else
boxKey =
CFStringCreateWithCString (NULL, "avcC", kCFStringEncodingUTF8);
box = CFDictionaryGetValue (atoms, boxKey);
CFRelease (boxKey);
codec_data_size = CFDataGetLength (box);
codec_data = g_malloc (codec_data_size);
CFDataGetBytes (box, CFRangeMake (0, codec_data_size), codec_data);
codec_data_buf = gst_buffer_new_wrapped (codec_data, codec_data_size);
gst_structure_set (s, "codec_data", GST_TYPE_BUFFER, codec_data_buf,
NULL);
if (self->details->format_id == kCMVideoCodecType_HEVC ||
self->details->format_id == kCMVideoCodecType_HEVCWithAlpha) {
sps[0] = codec_data[1];
sps[11] = codec_data[12];
gst_codec_utils_h265_caps_set_level_tier_and_profile (caps, sps, 12);
} else {
sps[0] = codec_data[1];
sps[1] = codec_data[2] & ~0xDF;
sps[2] = codec_data[3];
gst_codec_utils_h264_caps_set_level_and_profile (caps, sps, 3);
}
gst_buffer_unref (codec_data_buf);
}
break;
case GST_kCMVideoCodecType_Some_AppleProRes:
gst_structure_set (s, "variant", G_TYPE_STRING,
gst_vtutil_codec_type_to_prores_variant (self->specific_format_id),
NULL);
if (gst_vtenc_signal_ignored_alpha_component (self))
gst_structure_set (s, "depth", G_TYPE_INT, 24, NULL);
break;
default:
g_assert_not_reached ();
}
state =
gst_video_encoder_set_output_state (GST_VIDEO_ENCODER_CAST (self), caps,
self->input_state);
gst_video_codec_state_unref (state);
result = gst_video_encoder_negotiate (GST_VIDEO_ENCODER_CAST (self));
return result;
}
static GstFlowReturn
gst_vtenc_handle_frame (GstVideoEncoder * enc, GstVideoCodecFrame * frame)
{
GstVTEnc *self = GST_VTENC_CAST (enc);
if (!gst_vtenc_is_negotiated (self))
goto not_negotiated;
return gst_vtenc_encode_frame (self, frame);
not_negotiated:
gst_video_codec_frame_unref (frame);
return GST_FLOW_NOT_NEGOTIATED;
}
static gboolean
gst_vtenc_sink_event (GstVideoEncoder * enc, GstEvent * event)
{
GstVTEnc *self = GST_VTENC_CAST (enc);
GstEventType type = GST_EVENT_TYPE (event);
gboolean ret;
switch (type) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (self, "flush start received, setting flushing flag");
g_mutex_lock (&self->queue_mutex);
self->is_flushing = TRUE;
g_cond_signal (&self->queue_cond);
g_mutex_unlock (&self->queue_mutex);
break;
default:
break;
}
ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (enc, event);
switch (type) {
case GST_EVENT_FLUSH_STOP:
/* The base class handles this event and calls _flush().
* We can then safely reset the flushing flag. */
GST_DEBUG_OBJECT (self, "flush stop received, removing flushing flag");
g_mutex_lock (&self->queue_mutex);
self->is_flushing = FALSE;
g_mutex_unlock (&self->queue_mutex);
break;
default:
break;
}
return ret;
}
static GstStateChangeReturn
gst_vtenc_change_state (GstElement * element, GstStateChange transition)
{
GstVTEnc *self = GST_VTENC_CAST (element);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
GST_DEBUG_OBJECT (self, "pausing output loop on PAUSED->READY");
gst_vtenc_pause_output_loop (self);
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
static GstFlowReturn
gst_vtenc_finish (GstVideoEncoder * enc)
{
GstVTEnc *self = GST_VTENC_CAST (enc);
return gst_vtenc_finish_encoding (self, FALSE);
}
static gboolean
gst_vtenc_flush (GstVideoEncoder * enc)
{
GstVTEnc *self = GST_VTENC_CAST (enc);
GstFlowReturn ret;
ret = gst_vtenc_finish_encoding (self, TRUE);
return (ret == GST_FLOW_OK);
}
static void
gst_vtenc_set_colorimetry (GstVTEnc * self, VTCompressionSessionRef session)
{
OSStatus status;
CFStringRef primaries = NULL, transfer = NULL, matrix = NULL;
GstVideoColorimetry cm = GST_VIDEO_INFO_COLORIMETRY (&self->video_info);
/*
* https://developer.apple.com/documentation/corevideo/cvimagebuffer/image_buffer_ycbcr_matrix_constants
*/
switch (cm.matrix) {
case GST_VIDEO_COLOR_MATRIX_BT709:
matrix = kCVImageBufferYCbCrMatrix_ITU_R_709_2;
break;
case GST_VIDEO_COLOR_MATRIX_BT601:
matrix = kCVImageBufferYCbCrMatrix_ITU_R_601_4;
break;
case GST_VIDEO_COLOR_MATRIX_SMPTE240M:
matrix = kCVImageBufferYCbCrMatrix_SMPTE_240M_1995;
break;
case GST_VIDEO_COLOR_MATRIX_BT2020:
matrix = kCVImageBufferYCbCrMatrix_ITU_R_2020;
break;
default:
GST_WARNING_OBJECT (self, "Unsupported color matrix %u", cm.matrix);
}
/*
* https://developer.apple.com/documentation/corevideo/cvimagebuffer/image_buffer_transfer_function_constants
*/
switch (cm.transfer) {
case GST_VIDEO_TRANSFER_BT709:
case GST_VIDEO_TRANSFER_BT601:
case GST_VIDEO_TRANSFER_UNKNOWN:
transfer = kCVImageBufferTransferFunction_ITU_R_709_2;
break;
case GST_VIDEO_TRANSFER_SMPTE240M:
transfer = kCVImageBufferTransferFunction_SMPTE_240M_1995;
break;
case GST_VIDEO_TRANSFER_BT2020_12:
transfer = kCVImageBufferTransferFunction_ITU_R_2020;
break;
case GST_VIDEO_TRANSFER_SRGB:
if (__builtin_available (macOS 10.13, *))
transfer = kCVImageBufferTransferFunction_sRGB;
else
GST_WARNING_OBJECT (self, "macOS version is too old, the sRGB transfer "
"function is not available");
break;
case GST_VIDEO_TRANSFER_SMPTE2084:
if (__builtin_available (macOS 10.13, *))
transfer = kCVImageBufferTransferFunction_SMPTE_ST_2084_PQ;
else
GST_WARNING_OBJECT (self, "macOS version is too old, the SMPTE2084 "
"transfer function is not available");
break;
default:
GST_WARNING_OBJECT (self, "Unsupported color transfer %u", cm.transfer);
}
/*
* https://developer.apple.com/documentation/corevideo/cvimagebuffer/image_buffer_color_primaries_constants
*/
switch (cm.primaries) {
case GST_VIDEO_COLOR_PRIMARIES_BT709:
primaries = kCVImageBufferColorPrimaries_ITU_R_709_2;
break;
case GST_VIDEO_COLOR_PRIMARIES_SMPTE170M:
case GST_VIDEO_COLOR_PRIMARIES_SMPTE240M:
primaries = kCVImageBufferColorPrimaries_SMPTE_C;
break;
case GST_VIDEO_COLOR_PRIMARIES_BT2020:
primaries = kCVImageBufferColorPrimaries_ITU_R_2020;
break;
case GST_VIDEO_COLOR_PRIMARIES_SMPTERP431:
primaries = kCVImageBufferColorPrimaries_DCI_P3;
break;
case GST_VIDEO_COLOR_PRIMARIES_SMPTEEG432:
primaries = kCVImageBufferColorPrimaries_P3_D65;
break;
case GST_VIDEO_COLOR_PRIMARIES_EBU3213:
primaries = kCVImageBufferColorPrimaries_EBU_3213;
break;
default:
GST_WARNING_OBJECT (self, "Unsupported color primaries %u", cm.primaries);
}
if (primaries) {
status = VTSessionSetProperty (session,
kVTCompressionPropertyKey_ColorPrimaries, primaries);
GST_DEBUG_OBJECT (self, "kVTCompressionPropertyKey_ColorPrimaries =>"
"%d", status);
}
if (transfer) {
status = VTSessionSetProperty (session,
kVTCompressionPropertyKey_TransferFunction, transfer);
GST_DEBUG_OBJECT (self, "kVTCompressionPropertyKey_TransferFunction =>"
"%d", status);
}
if (matrix) {
status = VTSessionSetProperty (session,
kVTCompressionPropertyKey_YCbCrMatrix, matrix);
GST_DEBUG_OBJECT (self, "kVTCompressionPropertyKey_YCbCrMatrix => %d",
status);
}
}
static gboolean
gst_vtenc_compute_dts_offset (GstVTEnc * self, gint fps_n, gint fps_d)
{
gint num_offset_frames;
// kVTCompressionPropertyKey_AllowFrameReordering enables B-Frames
if (!self->allow_frame_reordering ||
(self->specific_format_id == kCMVideoCodecType_H264
&& self->h264_profile == GST_H264_PROFILE_BASELINE)) {
num_offset_frames = 0;
} else {
if (self->specific_format_id == kCMVideoCodecType_H264) {
// H264 encoder always sets 2 max_num_ref_frames
num_offset_frames = 1;
} else {
// HEVC encoder uses B-pyramid
num_offset_frames = 2;
}
}
if (fps_d == 0 && num_offset_frames != 0) {
GST_ERROR_OBJECT (self,
"Variable framerate is not supported with B-Frames");
return FALSE;
}
self->dts_offset =
gst_util_uint64_scale (num_offset_frames * GST_SECOND,
self->video_info.fps_d, self->video_info.fps_n);
GST_DEBUG_OBJECT (self, "DTS Offset:%" GST_TIME_FORMAT,
GST_TIME_ARGS (self->dts_offset));
return TRUE;
}
static VTCompressionSessionRef
gst_vtenc_create_session (GstVTEnc * self)
{
VTCompressionSessionRef session = NULL;
CFMutableDictionaryRef encoder_spec = NULL, pb_attrs = NULL;
OSStatus status;
#if !HAVE_IOS
const GstVTEncoderDetails *codec_details =
GST_VTENC_CLASS_GET_CODEC_DETAILS (G_OBJECT_GET_CLASS (self));
/* Apple's M1 hardware encoding fails when provided with an interlaced ProRes source.
* It's most likely a bug in VideoToolbox, as no such limitation has been officially mentioned anywhere.
* For now let's disable HW encoding entirely when such case occurs. */
gboolean enable_hw = !(GST_VIDEO_INFO_IS_INTERLACED (&self->video_info)
&& codec_details->format_id == GST_kCMVideoCodecType_Some_AppleProRes);
if (!enable_hw)
GST_WARNING_OBJECT (self,
"Interlaced content detected, disabling HW-accelerated encoding due to https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1429");
encoder_spec =
CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
gst_vtutil_dict_set_boolean (encoder_spec,
kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder,
enable_hw);
if (codec_details->require_hardware)
gst_vtutil_dict_set_boolean (encoder_spec,
kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder,
TRUE);
#endif
if (self->profile_level) {
pb_attrs = CFDictionaryCreateMutable (NULL, 0,
&kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
gst_vtutil_dict_set_i32 (pb_attrs, kCVPixelBufferWidthKey,
self->video_info.width);
gst_vtutil_dict_set_i32 (pb_attrs, kCVPixelBufferHeightKey,
self->video_info.height);
}
/* This was set in gst_vtenc_negotiate_specific_format_details() */
g_assert_cmpint (self->specific_format_id, !=, 0);
if (self->profile_level) {
if (!gst_vtenc_compute_dts_offset (self, self->video_info.fps_d,
self->video_info.fps_n)) {
goto beach;
}
}
status = VTCompressionSessionCreate (NULL,
self->video_info.width, self->video_info.height,
self->specific_format_id, encoder_spec, pb_attrs, NULL,
gst_vtenc_enqueue_buffer, self, &session);
GST_INFO_OBJECT (self, "VTCompressionSessionCreate for %d x %d => %d",
self->video_info.width, self->video_info.height, (int) status);
if (status != noErr) {
GST_ERROR_OBJECT (self, "VTCompressionSessionCreate() returned: %d",
(int) status);
goto beach;
}
if (self->profile_level) {
gst_vtenc_session_configure_expected_framerate (self, session,
(gdouble) self->video_info.fps_n / (gdouble) self->video_info.fps_d);
/*
* https://developer.apple.com/documentation/videotoolbox/kvtcompressionpropertykey_profilelevel
*/
status = VTSessionSetProperty (session,
kVTCompressionPropertyKey_ProfileLevel, self->profile_level);
GST_DEBUG_OBJECT (self, "kVTCompressionPropertyKey_ProfileLevel => %d",
(int) status);
status = VTSessionSetProperty (session,
kVTCompressionPropertyKey_AllowTemporalCompression, kCFBooleanTrue);
GST_DEBUG_OBJECT (self,
"kVTCompressionPropertyKey_AllowTemporalCompression => %d",
(int) status);
gst_vtenc_session_configure_max_keyframe_interval (self, session,
self->max_keyframe_interval);
gst_vtenc_session_configure_max_keyframe_interval_duration (self, session,
self->max_keyframe_interval_duration / ((gdouble) GST_SECOND));
gst_vtenc_session_configure_bitrate (self, session, self->bitrate);
}
/* Force encoder to not preserve alpha with 4444(XQ) ProRes formats if
* requested */
if (!self->preserve_alpha &&
(self->specific_format_id == kCMVideoCodecType_AppleProRes4444XQ ||
self->specific_format_id == kCMVideoCodecType_AppleProRes4444)) {
status = VTSessionSetProperty (session,
gstVTCodecPropertyKey_PreserveAlphaChannel, CFSTR ("NO"));
GST_DEBUG_OBJECT (self, "kVTCodecPropertyKey_PreserveAlphaChannel => %d",
(int) status);
}
gst_vtenc_set_colorimetry (self, session);
/* Interlacing */
switch (GST_VIDEO_INFO_INTERLACE_MODE (&self->video_info)) {
case GST_VIDEO_INTERLACE_MODE_PROGRESSIVE:
gst_vtenc_session_configure_property_int (self, session,
kVTCompressionPropertyKey_FieldCount, 1);
break;
case GST_VIDEO_INTERLACE_MODE_INTERLEAVED:
gst_vtenc_session_configure_property_int (self, session,
kVTCompressionPropertyKey_FieldCount, 2);
switch (GST_VIDEO_INFO_FIELD_ORDER (&self->video_info)) {
case GST_VIDEO_FIELD_ORDER_TOP_FIELD_FIRST:
status = VTSessionSetProperty (session,
kVTCompressionPropertyKey_FieldDetail,
kCMFormatDescriptionFieldDetail_TemporalTopFirst);
GST_DEBUG_OBJECT (self, "kVTCompressionPropertyKey_FieldDetail "
"TemporalTopFirst => %d", (int) status);
break;
case GST_VIDEO_FIELD_ORDER_BOTTOM_FIELD_FIRST:
status = VTSessionSetProperty (session,
kVTCompressionPropertyKey_FieldDetail,
kCMFormatDescriptionFieldDetail_TemporalBottomFirst);
GST_DEBUG_OBJECT (self, "kVTCompressionPropertyKey_FieldDetail "
"TemporalBottomFirst => %d", (int) status);
break;
case GST_VIDEO_FIELD_ORDER_UNKNOWN:
GST_INFO_OBJECT (self, "Unknown field order for interleaved content, "
"will check first buffer");
self->have_field_order = FALSE;
}
break;
default:
/* Caps negotiation should prevent this */
g_assert_not_reached ();
}
gst_vtenc_session_configure_realtime (self, session, self->realtime);
gst_vtenc_session_configure_allow_frame_reordering (self, session,
self->allow_frame_reordering);
gst_vtenc_session_configure_property_double (self, session,
kVTCompressionPropertyKey_Quality, self->quality);
if (self->dump_properties) {
gst_vtenc_session_dump_properties (self, session);
self->dump_properties = FALSE;
}
#ifdef HAVE_VIDEOTOOLBOX_10_9_6
if (VTCompressionSessionPrepareToEncodeFrames) {
status = VTCompressionSessionPrepareToEncodeFrames (session);
if (status != noErr) {
GST_ERROR_OBJECT (self,
"VTCompressionSessionPrepareToEncodeFrames() returned: %d",
(int) status);
}
}
#endif
beach:
if (encoder_spec)
CFRelease (encoder_spec);
if (pb_attrs)
CFRelease (pb_attrs);
return session;
}
static void
gst_vtenc_destroy_session (GstVTEnc * self, VTCompressionSessionRef * session)
{
VTCompressionSessionInvalidate (*session);
if (*session != NULL) {
CFRelease (*session);
*session = NULL;
}
}
typedef struct
{
GstVTEnc *self;
VTCompressionSessionRef session;
} GstVTDumpPropCtx;
static void
gst_vtenc_session_dump_property (CFStringRef prop_name,
CFDictionaryRef prop_attrs, GstVTDumpPropCtx * dpc)
{
gchar *name_str;
CFTypeRef prop_value;
OSStatus status;
name_str = gst_vtutil_string_to_utf8 (prop_name);
if (dpc->self->dump_attributes) {
gchar *attrs_str;
attrs_str = gst_vtutil_object_to_string (prop_attrs);
GST_DEBUG_OBJECT (dpc->self, "%s = %s", name_str, attrs_str);
g_free (attrs_str);
}
status = VTSessionCopyProperty (dpc->session, prop_name, NULL, &prop_value);
if (status == noErr) {
gchar *value_str;
value_str = gst_vtutil_object_to_string (prop_value);
GST_DEBUG_OBJECT (dpc->self, "%s = %s", name_str, value_str);
g_free (value_str);
if (prop_value != NULL)
CFRelease (prop_value);
} else {
GST_DEBUG_OBJECT (dpc->self, "%s = <failed to query: %d>",
name_str, (int) status);
}
g_free (name_str);
}
static void
gst_vtenc_session_dump_properties (GstVTEnc * self,
VTCompressionSessionRef session)
{
GstVTDumpPropCtx dpc = { self, session };
CFDictionaryRef dict;
OSStatus status;
status = VTSessionCopySupportedPropertyDictionary (session, &dict);
if (status != noErr)
goto error;
CFDictionaryApplyFunction (dict,
(CFDictionaryApplierFunction) gst_vtenc_session_dump_property, &dpc);
CFRelease (dict);
return;
error:
GST_WARNING_OBJECT (self, "failed to dump properties");
}
static void
gst_vtenc_session_configure_expected_framerate (GstVTEnc * self,
VTCompressionSessionRef session, gdouble framerate)
{
gst_vtenc_session_configure_property_double (self, session,
kVTCompressionPropertyKey_ExpectedFrameRate, framerate);
}
static void
gst_vtenc_session_configure_max_keyframe_interval (GstVTEnc * self,
VTCompressionSessionRef session, gint interval)
{
gst_vtenc_session_configure_property_int (self, session,
kVTCompressionPropertyKey_MaxKeyFrameInterval, interval);
}
static void
gst_vtenc_session_configure_max_keyframe_interval_duration (GstVTEnc * self,
VTCompressionSessionRef session, gdouble duration)
{
gst_vtenc_session_configure_property_double (self, session,
kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration, duration);
}
static void
gst_vtenc_session_configure_bitrate (GstVTEnc * self,
VTCompressionSessionRef session, guint 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
gst_vtenc_session_configure_allow_frame_reordering (GstVTEnc * self,
VTCompressionSessionRef session, gboolean allow_frame_reordering)
{
VTSessionSetProperty (session, kVTCompressionPropertyKey_AllowFrameReordering,
allow_frame_reordering ? kCFBooleanTrue : kCFBooleanFalse);
}
static void
gst_vtenc_session_configure_realtime (GstVTEnc * self,
VTCompressionSessionRef session, gboolean realtime)
{
VTSessionSetProperty (session, kVTCompressionPropertyKey_RealTime,
realtime ? kCFBooleanTrue : kCFBooleanFalse);
}
static OSStatus
gst_vtenc_session_configure_property_int (GstVTEnc * self,
VTCompressionSessionRef session, CFStringRef name, gint value)
{
CFNumberRef num;
OSStatus status;
gchar name_str[128];
num = CFNumberCreate (NULL, kCFNumberIntType, &value);
status = VTSessionSetProperty (session, name, num);
CFRelease (num);
CFStringGetCString (name, name_str, sizeof (name_str), kCFStringEncodingUTF8);
GST_DEBUG_OBJECT (self, "%s(%d) => %d", name_str, value, (int) status);
return status;
}
static OSStatus
gst_vtenc_session_configure_property_double (GstVTEnc * self,
VTCompressionSessionRef session, CFStringRef name, gdouble value)
{
CFNumberRef num;
OSStatus status;
gchar name_str[128];
num = CFNumberCreate (NULL, kCFNumberDoubleType, &value);
status = VTSessionSetProperty (session, name, num);
CFRelease (num);
CFStringGetCString (name, name_str, sizeof (name_str), kCFStringEncodingUTF8);
GST_DEBUG_OBJECT (self, "%s(%f) => %d", name_str, value, (int) status);
return status;
}
static void
gst_vtenc_update_latency (GstVTEnc * self)
{
OSStatus status;
CFNumberRef value;
int frames = 0;
GstClockTime frame_duration;
GstClockTime latency;
if (self->video_info.fps_d == 0) {
GST_INFO_OBJECT (self, "framerate not known, can't set latency");
return;
}
status = VTSessionCopyProperty (self->session,
kVTCompressionPropertyKey_NumberOfPendingFrames, NULL, &value);
if (status != noErr || !value) {
GST_INFO_OBJECT (self, "failed to get NumberOfPendingFrames: %d", status);
return;
}
CFNumberGetValue (value, kCFNumberSInt32Type, &frames);
if (MAX (self->latency_frames, frames) != self->latency_frames) {
self->latency_frames = frames;
if (self->video_info.fps_d == 0 || self->video_info.fps_n == 0) {
/* FIXME: Assume 25fps. This is better than reporting no latency at
* all and then later failing in live pipelines
*/
frame_duration = gst_util_uint64_scale (GST_SECOND, 1, 25);
} else {
frame_duration = gst_util_uint64_scale (GST_SECOND,
self->video_info.fps_d, self->video_info.fps_n);
}
latency = frame_duration * frames;
GST_INFO_OBJECT (self,
"latency status %d frames %d fps %d/%d time %" GST_TIME_FORMAT, status,
frames, self->video_info.fps_n, self->video_info.fps_d,
GST_TIME_ARGS (latency));
gst_video_encoder_set_latency (GST_VIDEO_ENCODER (self), latency, latency);
}
CFRelease (value);
}
static void
gst_vtenc_update_timestamps (GstVTEnc * self, GstVideoCodecFrame * frame,
CMSampleBufferRef sample_buf)
{
CMTime pts = CMSampleBufferGetOutputPresentationTimeStamp (sample_buf);
frame->pts = CMTIME_TO_GST_CLOCK_TIME (pts);
CMTime dts = CMSampleBufferGetOutputDecodeTimeStamp (sample_buf);
if (CMTIME_IS_VALID (dts)) {
frame->dts = CMTIME_TO_GST_CLOCK_TIME (dts) - self->dts_offset;
}
}
static GstFlowReturn
gst_vtenc_encode_frame (GstVTEnc * self, GstVideoCodecFrame * frame)
{
CMTime ts, duration;
GstCoreMediaMeta *meta;
CVPixelBufferRef pbuf = NULL;
OSStatus vt_status;
GstFlowReturn ret = GST_FLOW_OK;
CFDictionaryRef frame_props = NULL;
GstTaskState task_state;
gboolean is_flushing;
/* If this condition changes later while we're still in this function,
* it'll just fail on next frame encode or in _finish() */
task_state = gst_pad_get_task_state (GST_VIDEO_ENCODER_SRC_PAD (self));
if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
/* Abort if our loop failed to push frames downstream... */
if (self->downstream_ret != GST_FLOW_OK) {
if (self->downstream_ret == GST_FLOW_FLUSHING)
GST_DEBUG_OBJECT (self,
"Output loop stopped because of flushing, ignoring frame");
else
GST_WARNING_OBJECT (self,
"Output loop stopped with error (%s), leaving",
gst_flow_get_name (self->downstream_ret));
ret = self->downstream_ret;
goto drop;
}
/* ...or if it stopped because of the flushing flag while the queue
* was empty, in which case we didn't get GST_FLOW_FLUSHING... */
g_mutex_lock (&self->queue_mutex);
is_flushing = self->is_flushing;
g_mutex_unlock (&self->queue_mutex);
if (is_flushing) {
GST_DEBUG_OBJECT (self, "Flushing flag set, ignoring frame");
ret = GST_FLOW_FLUSHING;
goto drop;
}
/* .. or if it refuses to resume - e.g. it was stopped instead of paused */
if (!gst_vtenc_ensure_output_loop (self)) {
GST_ERROR_OBJECT (self, "Output loop failed to resume");
ret = GST_FLOW_ERROR;
goto drop;
}
}
if (GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME (frame)) {
GST_INFO_OBJECT (self, "received force-keyframe-event, will force intra");
frame_props = self->keyframe_props;
}
ts = CMTimeMake (frame->pts, GST_SECOND);
if (frame->duration != GST_CLOCK_TIME_NONE)
duration = CMTimeMake (frame->duration, GST_SECOND);
else
duration = kCMTimeInvalid;
/* If we don't have field order, we need to pick it up from the first buffer
* that has that information. The encoder session also cannot be reconfigured
* with a new field detail after it has been set, so we encode mixed streams
* with whatever the first buffer's field order is. */
if (!self->have_field_order) {
CFStringRef field_detail = NULL;
if (GST_VIDEO_BUFFER_IS_TOP_FIELD (frame->input_buffer))
field_detail = kCMFormatDescriptionFieldDetail_TemporalTopFirst;
else if (GST_VIDEO_BUFFER_IS_BOTTOM_FIELD (frame->input_buffer))
field_detail = kCMFormatDescriptionFieldDetail_TemporalBottomFirst;
if (field_detail) {
vt_status = VTSessionSetProperty (self->session,
kVTCompressionPropertyKey_FieldDetail, field_detail);
GST_DEBUG_OBJECT (self, "kVTCompressionPropertyKey_FieldDetail => %d",
(int) vt_status);
} else {
GST_WARNING_OBJECT (self, "have interlaced content, but don't know field "
"order yet, skipping buffer");
gst_video_codec_frame_unref (frame);
return GST_FLOW_OK;
}
self->have_field_order = TRUE;
}
meta = gst_buffer_get_core_media_meta (frame->input_buffer);
if (meta != NULL) {
pbuf = gst_core_media_buffer_get_pixel_buffer (frame->input_buffer);
}
#ifdef HAVE_IOS
if (pbuf == NULL) {
GstVideoFrame inframe, outframe;
GstBuffer *outbuf;
CVReturn cv_ret;
OSType pixel_format_type =
gst_video_format_to_cvpixelformat (GST_VIDEO_INFO_FORMAT
(&self->video_info));
/* FIXME: iOS has special stride requirements that we don't know yet.
* Copy into a newly allocated pixelbuffer for now. Probably makes
* sense to create a buffer pool around these at some point.
*/
if (!gst_video_frame_map (&inframe, &self->video_info, frame->input_buffer,
GST_MAP_READ)) {
GST_ERROR_OBJECT (self, "failed to map input buffer");
goto cv_error;
}
cv_ret =
CVPixelBufferCreate (NULL, self->video_info.width,
self->video_info.height, pixel_format_type, NULL, &pbuf);
if (cv_ret != kCVReturnSuccess) {
GST_ERROR_OBJECT (self, "CVPixelBufferCreate failed: %i", cv_ret);
gst_video_frame_unmap (&inframe);
goto cv_error;
}
outbuf =
gst_core_video_buffer_new ((CVBufferRef) pbuf, &self->video_info, NULL);
if (!gst_video_frame_map (&outframe, &self->video_info, outbuf,
GST_MAP_WRITE)) {
GST_ERROR_OBJECT (self, "Failed to map output buffer");
gst_video_frame_unmap (&inframe);
gst_buffer_unref (outbuf);
CVPixelBufferRelease (pbuf);
goto cv_error;
}
if (!gst_video_frame_copy (&outframe, &inframe)) {
GST_ERROR_OBJECT (self, "Failed to copy output frame");
gst_video_frame_unmap (&inframe);
gst_buffer_unref (outbuf);
CVPixelBufferRelease (pbuf);
goto cv_error;
}
gst_buffer_unref (outbuf);
gst_video_frame_unmap (&inframe);
gst_video_frame_unmap (&outframe);
}
#else
if (pbuf == NULL) {
GstVTEncFrame *vframe;
CVReturn cv_ret;
vframe = gst_vtenc_frame_new (frame->input_buffer, &self->video_info);
if (!vframe) {
GST_ERROR_OBJECT (self, "Failed to create a new input frame");
goto cv_error;
}
{
OSType pixel_format_type =
gst_video_format_to_cvpixelformat (GST_VIDEO_INFO_FORMAT
(&self->video_info));
const size_t num_planes = GST_VIDEO_FRAME_N_PLANES (&vframe->videoframe);
void *plane_base_addresses[GST_VIDEO_MAX_PLANES];
size_t plane_widths[GST_VIDEO_MAX_PLANES];
size_t plane_heights[GST_VIDEO_MAX_PLANES];
size_t plane_bytes_per_row[GST_VIDEO_MAX_PLANES];
size_t i;
for (i = 0; i < num_planes; i++) {
plane_base_addresses[i] =
GST_VIDEO_FRAME_PLANE_DATA (&vframe->videoframe, i);
plane_widths[i] = GST_VIDEO_FRAME_COMP_WIDTH (&vframe->videoframe, i);
plane_heights[i] = GST_VIDEO_FRAME_COMP_HEIGHT (&vframe->videoframe, i);
plane_bytes_per_row[i] =
GST_VIDEO_FRAME_COMP_STRIDE (&vframe->videoframe, i);
plane_bytes_per_row[i] =
GST_VIDEO_FRAME_COMP_STRIDE (&vframe->videoframe, i);
}
cv_ret = CVPixelBufferCreateWithPlanarBytes (NULL,
self->video_info.width, self->video_info.height,
pixel_format_type,
frame,
GST_VIDEO_FRAME_SIZE (&vframe->videoframe),
num_planes,
plane_base_addresses,
plane_widths,
plane_heights,
plane_bytes_per_row, gst_pixel_buffer_release_cb, vframe, NULL,
&pbuf);
if (cv_ret != kCVReturnSuccess) {
GST_ERROR_OBJECT (self, "CVPixelBufferCreateWithPlanarBytes failed: %i",
cv_ret);
gst_vtenc_frame_free (vframe);
goto cv_error;
}
}
}
#endif
/* We need to unlock the stream lock here because
* the encode call can wait for gst_vtenc_enqueue_buffer()
* to handle a buffer... which will take the stream lock
* from another thread and then deadlock */
GST_VIDEO_ENCODER_STREAM_UNLOCK (self);
/* HEVCWithAlpha encoder has a bug where it does not throttle the amount
* of input frames queued internally. Other encoders do not have this
* problem and correctly block until the internal queue has space.
* Trying to use kVTCompressionPropertyKey_MaxFrameDelayCount does not help.
* When paired with a fast enough source like videotestsrc, this can result in
* a ton of memory being taken up by frames inside the encoder, eventually killing
* the process because of OOM.
*
* The workaround here tries to block until the number of pending frames falls
* below a certain threshold. Best we can do until Apple fixes this. */
if (self->specific_format_id == kCMVideoCodecType_HEVCWithAlpha) {
CFNumberRef pending_num;
gint pending_frames;
VTSessionCopyProperty (self->session,
kVTCompressionPropertyKey_NumberOfPendingFrames, NULL, &pending_num);
CFNumberGetValue (pending_num, kCFNumberSInt32Type, &pending_frames);
CFRelease (pending_num);
g_mutex_lock (&self->encoding_mutex);
while (pending_frames > VTENC_HEVCALPHA_INPUT_LIMIT) {
g_cond_wait (&self->encoding_cond, &self->encoding_mutex);
VTSessionCopyProperty (self->session,
kVTCompressionPropertyKey_NumberOfPendingFrames, NULL, &pending_num);
CFNumberGetValue (pending_num, kCFNumberIntType, &pending_frames);
CFRelease (pending_num);
}
g_mutex_unlock (&self->encoding_mutex);
}
vt_status = VTCompressionSessionEncodeFrame (self->session,
pbuf, ts, duration, frame_props,
GINT_TO_POINTER (frame->system_frame_number), NULL);
GST_VIDEO_ENCODER_STREAM_LOCK (self);
if (vt_status != noErr) {
GST_WARNING_OBJECT (self, "VTCompressionSessionEncodeFrame returned %d",
(int) vt_status);
}
gst_video_codec_frame_unref (frame);
CVPixelBufferRelease (pbuf);
return ret;
drop:
{
gst_video_codec_frame_unref (frame);
return ret;
}
cv_error:
{
gst_video_codec_frame_unref (frame);
return GST_FLOW_ERROR;
}
}
static void
gst_vtenc_enqueue_buffer (void *outputCallbackRefCon,
void *sourceFrameRefCon,
OSStatus status,
VTEncodeInfoFlags infoFlags, CMSampleBufferRef sampleBuffer)
{
GstVTEnc *self = outputCallbackRefCon;
GstVideoCodecFrame *frame;
gboolean is_flushing;
frame =
gst_video_encoder_get_frame (GST_VIDEO_ENCODER_CAST (self),
GPOINTER_TO_INT (sourceFrameRefCon));
if (status != noErr) {
if (frame) {
GST_ELEMENT_ERROR (self, LIBRARY, ENCODE, (NULL),
("Failed to encode frame %d: %d", frame->system_frame_number,
(int) status));
} else {
GST_ELEMENT_ERROR (self, LIBRARY, ENCODE, (NULL),
("Failed to encode (frame unknown): %d", (int) status));
}
goto beach;
}
if (self->specific_format_id == kCMVideoCodecType_HEVCWithAlpha) {
/* See comment in gst_vtenc_encode_frame() above */
g_mutex_lock (&self->encoding_mutex);
g_cond_signal (&self->encoding_cond);
g_mutex_unlock (&self->encoding_mutex);
}
if (!frame) {
GST_WARNING_OBJECT (self, "No corresponding frame found!");
goto beach;
}
g_mutex_lock (&self->queue_mutex);
is_flushing = self->is_flushing;
g_mutex_unlock (&self->queue_mutex);
if (is_flushing) {
GST_DEBUG_OBJECT (self, "Ignoring frame %d because we're flushing",
frame->system_frame_number);
goto beach;
}
/* This may happen if we don't have enough bitrate */
if (sampleBuffer == NULL)
goto beach;
if (gst_vtenc_buffer_is_keyframe (self, sampleBuffer))
GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (frame);
/* We are dealing with block buffers here, so we don't need
* to enable the use of the video meta API on the core media buffer */
frame->output_buffer = gst_core_media_buffer_new (sampleBuffer, FALSE, NULL);
gst_vtenc_update_timestamps (self, frame, sampleBuffer);
/* Limit the amount of frames in our output queue
* to avoid processing too many frames ahead */
g_mutex_lock (&self->queue_mutex);
while (gst_vec_deque_get_length (self->output_queue) >
VTENC_OUTPUT_QUEUE_SIZE) {
g_cond_wait (&self->queue_cond, &self->queue_mutex);
}
g_mutex_unlock (&self->queue_mutex);
beach:
if (!frame)
return;
g_mutex_lock (&self->queue_mutex);
if (self->is_flushing) {
/* We can discard the frame here, no need to have the output loop do that */
gst_video_codec_frame_unref (frame);
g_mutex_unlock (&self->queue_mutex);
return;
}
/* Buffer-less frames will be discarded in the output loop */
gst_vec_deque_push_tail (self->output_queue, frame);
g_cond_signal (&self->queue_cond);
g_mutex_unlock (&self->queue_mutex);
}
static void
gst_vtenc_loop (GstVTEnc * self)
{
GstVideoCodecFrame *outframe;
GstCoreMediaMeta *meta;
GstFlowReturn ret = GST_FLOW_OK;
gboolean should_pause;
g_mutex_lock (&self->queue_mutex);
while (gst_vec_deque_is_empty (self->output_queue) && !self->pause_task
&& !self->is_flushing) {
g_cond_wait (&self->queue_cond, &self->queue_mutex);
}
if (self->pause_task) {
g_mutex_unlock (&self->queue_mutex);
gst_pad_pause_task (GST_VIDEO_ENCODER_CAST (self)->srcpad);
return;
}
while ((outframe = gst_vec_deque_pop_head (self->output_queue))) {
g_cond_signal (&self->queue_cond);
g_mutex_unlock (&self->queue_mutex);
/* Keep the stream lock -> queue lock order */
GST_VIDEO_ENCODER_STREAM_LOCK (self);
g_mutex_lock (&self->queue_mutex);
if (self->is_flushing) {
GST_LOG_OBJECT (self, "flushing frame %d", outframe->system_frame_number);
gst_video_codec_frame_unref (outframe);
GST_VIDEO_ENCODER_STREAM_UNLOCK (self);
continue;
}
g_mutex_unlock (&self->queue_mutex);
if (self->negotiate_downstream &&
(meta = gst_buffer_get_core_media_meta (outframe->output_buffer))) {
if (!gst_vtenc_negotiate_downstream (self, meta->sample_buf)) {
ret = GST_FLOW_NOT_NEGOTIATED;
gst_video_codec_frame_unref (outframe);
g_mutex_lock (&self->queue_mutex);
/* the rest of the frames will be pop'd and unref'd later */
break;
}
self->negotiate_downstream = FALSE;
}
gst_vtenc_update_latency (self);
GST_LOG_OBJECT (self, "finishing frame %d", outframe->system_frame_number);
GST_VIDEO_ENCODER_STREAM_UNLOCK (self);
/* releases frame, even if it has no output buffer (i.e. failed to encode) */
ret =
gst_video_encoder_finish_frame (GST_VIDEO_ENCODER_CAST (self),
outframe);
g_mutex_lock (&self->queue_mutex);
if (ret != GST_FLOW_OK)
break;
}
g_mutex_unlock (&self->queue_mutex);
GST_VIDEO_ENCODER_STREAM_LOCK (self);
self->downstream_ret = ret;
/* We need to empty the queue immediately so that enqueue_buffer()
* can push out the current buffer, otherwise it can block other
* encoder callbacks completely */
if (ret != GST_FLOW_OK) {
g_mutex_lock (&self->queue_mutex);
while ((outframe = gst_vec_deque_pop_head (self->output_queue))) {
GST_LOG_OBJECT (self, "flushing frame %d", outframe->system_frame_number);
gst_video_codec_frame_unref (outframe);
}
g_cond_signal (&self->queue_cond);
g_mutex_unlock (&self->queue_mutex);
}
GST_VIDEO_ENCODER_STREAM_UNLOCK (self);
/* Check is_flushing here in case we had an empty queue.
* In that scenario we also want to pause, as the encoder callback
* will discard any frames that are output while flushing */
g_mutex_lock (&self->queue_mutex);
should_pause = ret != GST_FLOW_OK || self->is_flushing;
g_mutex_unlock (&self->queue_mutex);
if (should_pause) {
GST_DEBUG_OBJECT (self, "pausing output task: %s",
ret != GST_FLOW_OK ? gst_flow_get_name (ret) : "flushing");
gst_pad_pause_task (GST_VIDEO_ENCODER_CAST (self)->srcpad);
}
}
static gboolean
gst_vtenc_buffer_is_keyframe (GstVTEnc * self, CMSampleBufferRef sbuf)
{
gboolean result = FALSE;
CFArrayRef attachments_for_sample;
attachments_for_sample = CMSampleBufferGetSampleAttachmentsArray (sbuf, 0);
if (attachments_for_sample != NULL) {
CFDictionaryRef attachments;
CFBooleanRef depends_on_others;
attachments = CFArrayGetValueAtIndex (attachments_for_sample, 0);
depends_on_others = CFDictionaryGetValue (attachments,
kCMSampleAttachmentKey_DependsOnOthers);
result = (depends_on_others == kCFBooleanFalse);
}
return result;
}
#ifndef HAVE_IOS
static GstVTEncFrame *
gst_vtenc_frame_new (GstBuffer * buf, GstVideoInfo * video_info)
{
GstVTEncFrame *frame;
frame = g_slice_new (GstVTEncFrame);
frame->buf = gst_buffer_ref (buf);
if (!gst_video_frame_map (&frame->videoframe, video_info, buf, GST_MAP_READ)) {
gst_buffer_unref (frame->buf);
g_slice_free (GstVTEncFrame, frame);
return NULL;
}
return frame;
}
static void
gst_vtenc_frame_free (GstVTEncFrame * frame)
{
gst_video_frame_unmap (&frame->videoframe);
gst_buffer_unref (frame->buf);
g_slice_free (GstVTEncFrame, frame);
}
static void
gst_pixel_buffer_release_cb (void *releaseRefCon, const void *dataPtr,
size_t dataSize, size_t numberOfPlanes, const void *planeAddresses[])
{
GstVTEncFrame *frame = (GstVTEncFrame *) releaseRefCon;
gst_vtenc_frame_free (frame);
}
#endif
static void
gst_vtenc_register (GstPlugin * plugin,
const GstVTEncoderDetails * codec_details)
{
GTypeInfo type_info = {
sizeof (GstVTEncClass),
(GBaseInitFunc) gst_vtenc_base_init,
NULL,
(GClassInitFunc) gst_vtenc_class_init,
NULL,
NULL,
sizeof (GstVTEnc),
0,
(GInstanceInitFunc) gst_vtenc_init,
};
gchar *type_name;
GType type;
gboolean result;
type_name = g_strdup_printf ("vtenc_%s", codec_details->element_name);
type =
g_type_register_static (GST_TYPE_VIDEO_ENCODER, type_name, &type_info, 0);
g_type_set_qdata (type, GST_VTENC_CODEC_DETAILS_QDATA,
(gpointer) codec_details);
result = gst_element_register (plugin, type_name, GST_RANK_PRIMARY, type);
if (!result) {
GST_ERROR_OBJECT (plugin, "failed to register element %s", type_name);
}
g_free (type_name);
}
static const GstVTEncoderDetails gst_vtenc_codecs[] = {
{"H.264", "h264", "video/x-h264", kCMVideoCodecType_H264, FALSE},
{"H.265/HEVC", "h265", "video/x-h265", kCMVideoCodecType_HEVC, FALSE},
{"H.265/HEVC with alpha", "h265a", "video/x-h265",
kCMVideoCodecType_HEVCWithAlpha, FALSE},
#ifndef HAVE_IOS
{"H.264 (HW only)", "h264_hw", "video/x-h264", kCMVideoCodecType_H264, TRUE},
{"H.265/HEVC (HW only)", "h265_hw", "video/x-h265", kCMVideoCodecType_HEVC,
TRUE},
{"H.265/HEVC with alpha (HW only)", "h265a_hw", "video/x-h265",
kCMVideoCodecType_HEVCWithAlpha, TRUE},
#endif
{"Apple ProRes", "prores", "video/x-prores",
GST_kCMVideoCodecType_Some_AppleProRes, FALSE},
};
void
gst_vtenc_register_elements (GstPlugin * plugin)
{
guint i;
GST_DEBUG_CATEGORY_INIT (gst_vtenc_debug, "vtenc",
0, "Apple VideoToolbox Encoder Wrapper");
for (i = 0; i != G_N_ELEMENTS (gst_vtenc_codecs); i++)
gst_vtenc_register (plugin, &gst_vtenc_codecs[i]);
}
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