gstreamer/sys/applemedia/vtenc.c

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/*
* Copyright (C) 2010 Ole André Vadla Ravnås <oravnas@cisco.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 the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "vtenc.h"
#include "coremediabuffer.h"
#include "vtutil.h"
#define VTENC_DEFAULT_USAGE 6 /* Profile: Baseline Level: 2.1 */
#define VTENC_DEFAULT_BITRATE 768
#define VTENC_MIN_RESET_INTERVAL (GST_SECOND / 2)
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")
enum
{
PROP_0,
PROP_USAGE,
PROP_BITRATE
};
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 GstStateChangeReturn gst_vtenc_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_vtenc_sink_setcaps (GstPad * pad, GstCaps * caps);
static void gst_vtenc_clear_cached_caps_downstream (GstVTEnc * self);
static GstFlowReturn gst_vtenc_chain (GstPad * pad, GstBuffer * buf);
static gboolean gst_vtenc_src_event (GstPad * pad, 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_usage (GstVTEnc * self,
VTCompressionSessionRef session, gint usage);
static void gst_vtenc_session_configure_expected_framerate (GstVTEnc * self,
VTCompressionSessionRef session, gdouble framerate);
static void gst_vtenc_session_configure_expected_duration (GstVTEnc * self,
VTCompressionSessionRef session, gdouble duration);
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 VTStatus gst_vtenc_session_configure_property_int (GstVTEnc * self,
VTCompressionSessionRef session, CFStringRef name, gint value);
static VTStatus gst_vtenc_session_configure_property_double (GstVTEnc * self,
VTCompressionSessionRef session, CFStringRef name, gdouble value);
static GstFlowReturn gst_vtenc_encode_frame (GstVTEnc * self, GstBuffer * buf);
static VTStatus gst_vtenc_enqueue_buffer (void *data, int a2, int a3, int a4,
CMSampleBufferRef sbuf, int a6, int a7);
static gboolean gst_vtenc_buffer_is_keyframe (GstVTEnc * self,
CMSampleBufferRef sbuf);
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;
GstPadTemplate *sink_template, *src_template;
GstCaps *src_caps;
GstElementDetails details;
details.longname = g_strdup_printf ("%s encoder", codec_details->name);
details.klass = g_strdup_printf ("Codec/Encoder/Video");
details.description = g_strdup_printf ("%s encoder", codec_details->name);
gst_element_class_set_metadata (element_class,
details.longname, details.klass, details.description,
"Ole André Vadla Ravnås <oravnas@cisco.com>");
g_free (details.longname);
g_free (details.klass);
g_free (details.description);
sink_template = gst_pad_template_new ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('N', 'V', '1', '2'),
"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));
gst_element_class_add_pad_template (element_class, sink_template);
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);
if (codec_details->format_id == kVTFormatH264) {
gst_structure_set (gst_caps_get_structure (src_caps, 0),
"stream-format", G_TYPE_STRING, "avc", NULL);
}
src_template = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
src_caps);
gst_element_class_add_pad_template (element_class, src_template);
}
static void
gst_vtenc_class_init (GstVTEncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) 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;
gstelement_class->change_state = gst_vtenc_change_state;
g_object_class_install_property (gobject_class, PROP_USAGE,
g_param_spec_int ("usage", "Usage",
"Usage enumeration value",
G_MININT, G_MAXINT, VTENC_DEFAULT_USAGE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_BITRATE,
g_param_spec_uint ("bitrate", "Bitrate",
"Target video bitrate in kbps",
1, G_MAXUINT, VTENC_DEFAULT_BITRATE,
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);
GstElementClass *element_klass = GST_ELEMENT_CLASS (klass);
GstElement *element = GST_ELEMENT (self);
self->details = GST_VTENC_CLASS_GET_CODEC_DETAILS (klass);
self->sinkpad = gst_pad_new_from_template
(gst_element_class_get_pad_template (element_klass, "sink"), "sink");
gst_element_add_pad (element, self->sinkpad);
gst_pad_set_setcaps_function (self->sinkpad, gst_vtenc_sink_setcaps);
gst_pad_set_chain_function (self->sinkpad, gst_vtenc_chain);
self->srcpad = gst_pad_new_from_template
(gst_element_class_get_pad_template (element_klass, "src"), "src");
gst_pad_set_event_function (self->srcpad, gst_vtenc_src_event);
gst_element_add_pad (element, self->srcpad);
/* These could be controlled by properties later */
self->dump_properties = FALSE;
self->dump_attributes = FALSE;
}
static gint
gst_vtenc_get_usage (GstVTEnc * self)
{
gint result;
GST_OBJECT_LOCK (self);
result = self->usage;
GST_OBJECT_UNLOCK (self);
return result;
}
static void
gst_vtenc_set_usage (GstVTEnc * self, gint usage)
{
GST_OBJECT_LOCK (self);
self->usage = usage;
if (self->session != NULL)
gst_vtenc_session_configure_usage (self, self->session, usage);
GST_OBJECT_UNLOCK (self);
}
static guint
gst_vtenc_get_bitrate (GstVTEnc * self)
{
guint result;
GST_OBJECT_LOCK (self);
result = self->bitrate;
GST_OBJECT_UNLOCK (self);
return result;
}
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_get_property (GObject * obj, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVTEnc *self = GST_VTENC_CAST (obj);
switch (prop_id) {
case PROP_USAGE:
g_value_set_int (value, gst_vtenc_get_usage (self));
break;
case PROP_BITRATE:
g_value_set_uint (value, gst_vtenc_get_bitrate (self) * 8 / 1000);
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_USAGE:
gst_vtenc_set_usage (self, g_value_get_int (value));
break;
case PROP_BITRATE:
gst_vtenc_set_bitrate (self, g_value_get_uint (value) * 1000 / 8);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_vtenc_change_state (GstElement * element, GstStateChange transition)
{
GstVTEnc *self = GST_VTENC_CAST (element);
GError *error = NULL;
GstStateChangeReturn ret;
if (transition == GST_STATE_CHANGE_NULL_TO_READY) {
self->ctx = gst_core_media_ctx_new (GST_API_CORE_VIDEO | GST_API_CORE_MEDIA
| GST_API_VIDEO_TOOLBOX, &error);
if (error != NULL)
goto api_error;
self->cur_outbufs = g_ptr_array_new ();
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (transition == GST_STATE_CHANGE_READY_TO_NULL) {
GST_OBJECT_LOCK (self);
gst_vtenc_destroy_session (self, &self->session);
if (self->options != NULL) {
CFRelease (self->options);
self->options = NULL;
}
self->negotiated_width = self->negotiated_height = 0;
self->negotiated_fps_n = self->negotiated_fps_d = 0;
gst_vtenc_clear_cached_caps_downstream (self);
GST_OBJECT_UNLOCK (self);
g_ptr_array_free (self->cur_outbufs, TRUE);
self->cur_outbufs = NULL;
g_object_unref (self->ctx);
self->ctx = NULL;
}
return ret;
api_error:
{
GST_ELEMENT_ERROR (self, RESOURCE, FAILED, ("API error"),
("%s", error->message));
g_clear_error (&error);
return GST_STATE_CHANGE_FAILURE;
}
}
static gboolean
gst_vtenc_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstVTEnc *self = GST_VTENC_CAST (GST_PAD_PARENT (pad));
GstStructure *structure;
VTCompressionSessionRef session;
GST_OBJECT_LOCK (self);
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "width", &self->negotiated_width);
gst_structure_get_int (structure, "height", &self->negotiated_height);
gst_structure_get_fraction (structure, "framerate",
&self->negotiated_fps_n, &self->negotiated_fps_d);
gst_vtenc_destroy_session (self, &self->session);
GST_OBJECT_UNLOCK (self);
session = gst_vtenc_create_session (self);
GST_OBJECT_LOCK (self);
self->session = session;
if (self->options != NULL)
CFRelease (self->options);
self->options = CFDictionaryCreateMutable (NULL, 0,
&kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
GST_OBJECT_UNLOCK (self);
return TRUE;
}
static gboolean
gst_vtenc_is_negotiated (GstVTEnc * self)
{
return self->negotiated_width != 0;
}
static gboolean
gst_vtenc_negotiate_downstream (GstVTEnc * self, CMSampleBufferRef sbuf)
{
gboolean result;
GstCMApi *cm = self->ctx->cm;
GstCaps *caps;
GstStructure *s;
if (self->caps_width == self->negotiated_width &&
self->caps_height == self->negotiated_height &&
self->caps_fps_n == self->negotiated_fps_n &&
self->caps_fps_d == self->negotiated_fps_d) {
return TRUE;
}
caps = gst_caps_copy (gst_pad_get_pad_template_caps (self->srcpad));
s = gst_caps_get_structure (caps, 0);
gst_structure_set (s,
"width", G_TYPE_INT, self->negotiated_width,
"height", G_TYPE_INT, self->negotiated_height,
"framerate", GST_TYPE_FRACTION,
self->negotiated_fps_n, self->negotiated_fps_d, NULL);
if (self->details->format_id == kVTFormatH264) {
CMFormatDescriptionRef fmt;
CFDictionaryRef atoms;
CFStringRef avccKey;
CFDataRef avcc;
GstBuffer *codec_data;
fmt = cm->CMSampleBufferGetFormatDescription (sbuf);
atoms = cm->CMFormatDescriptionGetExtension (fmt,
*(cm->kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms));
avccKey = CFStringCreateWithCString (NULL, "avcC", kCFStringEncodingUTF8);
avcc = CFDictionaryGetValue (atoms, avccKey);
CFRelease (avccKey);
codec_data = gst_buffer_new_and_alloc (CFDataGetLength (avcc));
CFDataGetBytes (avcc, CFRangeMake (0, CFDataGetLength (avcc)),
GST_BUFFER_DATA (codec_data));
gst_structure_set (s, "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
gst_buffer_unref (codec_data);
}
result = gst_pad_set_caps (self->srcpad, caps);
gst_caps_unref (caps);
self->caps_width = self->negotiated_width;
self->caps_height = self->negotiated_height;
self->caps_fps_n = self->negotiated_fps_n;
self->caps_fps_d = self->negotiated_fps_d;
return result;
}
static void
gst_vtenc_clear_cached_caps_downstream (GstVTEnc * self)
{
self->caps_width = self->caps_height = 0;
self->caps_fps_n = self->caps_fps_d = 0;
}
static GstFlowReturn
gst_vtenc_chain (GstPad * pad, GstBuffer * buf)
{
GstVTEnc *self = GST_VTENC_CAST (GST_PAD_PARENT (pad));
if (!gst_vtenc_is_negotiated (self))
goto not_negotiated;
return gst_vtenc_encode_frame (self, buf);
not_negotiated:
gst_buffer_unref (buf);
return GST_FLOW_NOT_NEGOTIATED;
}
static gboolean
gst_vtenc_src_event (GstPad * pad, GstEvent * event)
{
GstVTEnc *self = GST_VTENC_CAST (GST_PAD_PARENT (pad));
gboolean ret = TRUE;
gboolean handled = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
if (gst_event_has_name (event, "rtcp-pli")) {
GST_OBJECT_LOCK (self);
if (self->options != NULL) {
GST_INFO_OBJECT (self, "received PLI, will force intra");
CFDictionaryAddValue (self->options,
*(self->ctx->vt->kVTEncodeFrameOptionKey_ForceKeyFrame),
kCFBooleanTrue);
} else {
GST_INFO_OBJECT (self,
"received PLI but encode not yet started, ignoring");
}
GST_OBJECT_UNLOCK (self);
handled = TRUE;
}
break;
default:
break;
}
if (handled)
gst_event_unref (event);
else
ret = gst_pad_push_event (self->sinkpad, event);
return ret;
}
static VTCompressionSessionRef
gst_vtenc_create_session (GstVTEnc * self)
{
VTCompressionSessionRef session = NULL;
GstCVApi *cv = self->ctx->cv;
GstVTApi *vt = self->ctx->vt;
CFMutableDictionaryRef pb_attrs;
VTCompressionOutputCallback callback;
VTStatus status;
pb_attrs = CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
gst_vtutil_dict_set_i32 (pb_attrs, *(cv->kCVPixelBufferPixelFormatTypeKey),
kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange);
gst_vtutil_dict_set_i32 (pb_attrs, *(cv->kCVPixelBufferWidthKey),
self->negotiated_width);
gst_vtutil_dict_set_i32 (pb_attrs, *(cv->kCVPixelBufferHeightKey),
self->negotiated_height);
callback.func = gst_vtenc_enqueue_buffer;
callback.data = self;
status = vt->VTCompressionSessionCreate (NULL,
self->negotiated_width, self->negotiated_height,
self->details->format_id, 0, pb_attrs, 0, callback, &session);
GST_INFO_OBJECT (self, "VTCompressionSessionCreate for %d x %d => %d",
self->negotiated_width, self->negotiated_height, status);
if (status != kVTSuccess)
goto beach;
if (self->dump_properties) {
gst_vtenc_session_dump_properties (self, session);
self->dump_properties = FALSE;
}
gst_vtenc_session_configure_usage (self, session, gst_vtenc_get_usage (self));
gst_vtenc_session_configure_expected_framerate (self, session,
(gdouble) self->negotiated_fps_n / (gdouble) self->negotiated_fps_d);
gst_vtenc_session_configure_expected_duration (self, session,
(gdouble) self->negotiated_fps_d / (gdouble) self->negotiated_fps_n);
status = vt->VTCompressionSessionSetProperty (session,
*(vt->kVTCompressionPropertyKey_ProfileLevel),
*(vt->kVTProfileLevel_H264_Baseline_3_0));
GST_DEBUG_OBJECT (self, "kVTCompressionPropertyKey_ProfileLevel => %d",
status);
status = vt->VTCompressionSessionSetProperty (session,
*(vt->kVTCompressionPropertyKey_AllowTemporalCompression),
kCFBooleanTrue);
GST_DEBUG_OBJECT (self,
"kVTCompressionPropertyKey_AllowTemporalCompression => %d", status);
gst_vtenc_session_configure_max_keyframe_interval (self, session, 0);
gst_vtenc_session_configure_max_keyframe_interval_duration (self, session,
G_MAXDOUBLE);
gst_vtenc_session_configure_bitrate (self, session,
gst_vtenc_get_bitrate (self));
beach:
CFRelease (pb_attrs);
return session;
}
static void
gst_vtenc_destroy_session (GstVTEnc * self, VTCompressionSessionRef * session)
{
self->ctx->vt->VTCompressionSessionInvalidate (*session);
self->ctx->vt->VTCompressionSessionRelease (*session);
*session = NULL;
}
typedef struct
{
GstVTEnc *self;
GstVTApi *vt;
VTCompressionSessionRef session;
} GstVTDumpPropCtx;
static void
gst_vtenc_session_dump_property (CFStringRef prop_name,
CFDictionaryRef prop_attrs, GstVTDumpPropCtx * dpc)
{
gchar *name_str;
CFTypeRef prop_value;
VTStatus 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 = dpc->vt->VTCompressionSessionCopyProperty (dpc->session, prop_name,
NULL, &prop_value);
if (status == kVTSuccess) {
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, status);
}
g_free (name_str);
}
static void
gst_vtenc_session_dump_properties (GstVTEnc * self,
VTCompressionSessionRef session)
{
GstVTDumpPropCtx dpc = { self, self->ctx->vt, session };
CFDictionaryRef dict;
VTStatus status;
status = self->ctx->vt->VTCompressionSessionCopySupportedPropertyDictionary
(session, &dict);
if (status != kVTSuccess)
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_usage (GstVTEnc * self,
VTCompressionSessionRef session, gint usage)
{
gst_vtenc_session_configure_property_int (self, session,
*(self->ctx->vt->kVTCompressionPropertyKey_Usage), usage);
}
static void
gst_vtenc_session_configure_expected_framerate (GstVTEnc * self,
VTCompressionSessionRef session, gdouble framerate)
{
gst_vtenc_session_configure_property_double (self, session,
*(self->ctx->vt->kVTCompressionPropertyKey_ExpectedFrameRate), framerate);
}
static void
gst_vtenc_session_configure_expected_duration (GstVTEnc * self,
VTCompressionSessionRef session, gdouble duration)
{
gst_vtenc_session_configure_property_double (self, session,
*(self->ctx->vt->kVTCompressionPropertyKey_ExpectedDuration), duration);
}
static void
gst_vtenc_session_configure_max_keyframe_interval (GstVTEnc * self,
VTCompressionSessionRef session, gint interval)
{
gst_vtenc_session_configure_property_int (self, session,
*(self->ctx->vt->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,
*(self->ctx->vt->kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration),
duration);
}
static void
gst_vtenc_session_configure_bitrate (GstVTEnc * self,
VTCompressionSessionRef session, guint bitrate)
{
gst_vtenc_session_configure_property_int (self, session,
*(self->ctx->vt->kVTCompressionPropertyKey_AverageDataRate), bitrate);
}
static VTStatus
gst_vtenc_session_configure_property_int (GstVTEnc * self,
VTCompressionSessionRef session, CFStringRef name, gint value)
{
CFNumberRef num;
VTStatus status;
gchar name_str[128];
num = CFNumberCreate (NULL, kCFNumberIntType, &value);
status = self->ctx->vt->VTCompressionSessionSetProperty (session, name, num);
CFRelease (num);
CFStringGetCString (name, name_str, sizeof (name_str), kCFStringEncodingUTF8);
GST_DEBUG_OBJECT (self, "%s(%d) => %d", name_str, value, status);
return status;
}
static VTStatus
gst_vtenc_session_configure_property_double (GstVTEnc * self,
VTCompressionSessionRef session, CFStringRef name, gdouble value)
{
CFNumberRef num;
VTStatus status;
gchar name_str[128];
num = CFNumberCreate (NULL, kCFNumberDoubleType, &value);
status = self->ctx->vt->VTCompressionSessionSetProperty (session, name, num);
CFRelease (num);
CFStringGetCString (name, name_str, sizeof (name_str), kCFStringEncodingUTF8);
GST_DEBUG_OBJECT (self, "%s(%f) => %d", name_str, value, status);
return status;
}
static GstFlowReturn
gst_vtenc_encode_frame (GstVTEnc * self, GstBuffer * buf)
{
GstCVApi *cv = self->ctx->cv;
GstVTApi *vt = self->ctx->vt;
CMTime ts, duration;
CVPixelBufferRef pbuf = NULL;
VTStatus vt_status;
GstFlowReturn ret = GST_FLOW_OK;
guint i;
self->cur_inbuf = buf;
ts = self->ctx->cm->CMTimeMake
(GST_TIME_AS_MSECONDS (GST_BUFFER_TIMESTAMP (buf)), 1000);
duration = self->ctx->cm->CMTimeMake
(GST_TIME_AS_MSECONDS (GST_BUFFER_DURATION (buf)), 1000);
if (GST_IS_CORE_MEDIA_BUFFER (buf)) {
GstCoreMediaBuffer *cmbuf = GST_CORE_MEDIA_BUFFER_CAST (buf);
pbuf = gst_core_media_buffer_get_pixel_buffer (cmbuf);
}
if (pbuf == NULL) {
CVReturn cv_ret;
cv_ret = cv->CVPixelBufferCreateWithBytes (NULL,
self->negotiated_width, self->negotiated_height,
kCVPixelFormatType_422YpCbCr8Deprecated, GST_BUFFER_DATA (buf),
self->negotiated_width * 2,
(CVPixelBufferReleaseBytesCallback) gst_buffer_unref, buf, NULL, &pbuf);
if (cv_ret != kCVReturnSuccess)
goto cv_error;
gst_buffer_ref (buf);
}
GST_OBJECT_LOCK (self);
self->expect_keyframe = CFDictionaryContainsKey (self->options,
*(vt->kVTEncodeFrameOptionKey_ForceKeyFrame));
if (self->expect_keyframe)
gst_vtenc_clear_cached_caps_downstream (self);
vt_status = self->ctx->vt->VTCompressionSessionEncodeFrame (self->session,
pbuf, ts, duration, self->options, NULL, NULL);
if (vt_status != 0) {
GST_WARNING_OBJECT (self, "VTCompressionSessionEncodeFrame returned %d",
vt_status);
}
self->ctx->vt->VTCompressionSessionCompleteFrames (self->session,
*(self->ctx->cm->kCMTimeInvalid));
GST_OBJECT_UNLOCK (self);
cv->CVPixelBufferRelease (pbuf);
self->cur_inbuf = NULL;
gst_buffer_unref (buf);
if (self->cur_outbufs->len > 0) {
GstCoreMediaBuffer *cmbuf =
GST_CORE_MEDIA_BUFFER_CAST (g_ptr_array_index (self->cur_outbufs, 0));
if (!gst_vtenc_negotiate_downstream (self, cmbuf->sample_buf))
ret = GST_FLOW_NOT_NEGOTIATED;
}
for (i = 0; i != self->cur_outbufs->len; i++) {
GstBuffer *buf = g_ptr_array_index (self->cur_outbufs, i);
if (ret == GST_FLOW_OK) {
gst_buffer_set_caps (buf, GST_PAD_CAPS (self->srcpad));
ret = gst_pad_push (self->srcpad, buf);
} else {
gst_buffer_unref (buf);
}
}
g_ptr_array_set_size (self->cur_outbufs, 0);
return ret;
cv_error:
{
self->cur_inbuf = NULL;
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static VTStatus
gst_vtenc_enqueue_buffer (void *data, int a2, int a3, int a4,
CMSampleBufferRef sbuf, int a6, int a7)
{
GstVTEnc *self = data;
gboolean is_keyframe;
GstBuffer *buf;
/* This may happen if we don't have enough bitrate */
if (sbuf == NULL)
goto beach;
is_keyframe = gst_vtenc_buffer_is_keyframe (self, sbuf);
if (self->expect_keyframe) {
if (!is_keyframe)
goto beach;
CFDictionaryRemoveValue (self->options,
*(self->ctx->vt->kVTEncodeFrameOptionKey_ForceKeyFrame));
}
self->expect_keyframe = FALSE;
buf = gst_core_media_buffer_new (self->ctx, sbuf);
gst_buffer_copy_metadata (buf, self->cur_inbuf, GST_BUFFER_COPY_TIMESTAMPS);
if (is_keyframe) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
} else {
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
}
g_ptr_array_add (self->cur_outbufs, buf);
beach:
return kVTSuccess;
}
static gboolean
gst_vtenc_buffer_is_keyframe (GstVTEnc * self, CMSampleBufferRef sbuf)
{
gboolean result = FALSE;
CFArrayRef attachments_for_sample;
attachments_for_sample =
self->ctx->cm->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,
*(self->ctx->cm->kCMSampleAttachmentKey_DependsOnOthers));
result = (depends_on_others == kCFBooleanFalse);
}
return result;
}
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 (GstVTEncClass),
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_ELEMENT, 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_NONE, 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", kVTFormatH264},
};
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]);
}