static gboolean
gst_vtenc_negotiate_downstream (GstVTEnc * self, CMSampleBufferRef sbuf)
{
gboolean result;
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_pad_get_pad_template_caps (self->srcpad);
caps = gst_caps_make_writable (caps);
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;
gpointer codec_data;
gsize codec_data_size;
GstBuffer *codec_data_buf;
fmt = CMSampleBufferGetFormatDescription (sbuf);
atoms = CMFormatDescriptionGetExtension (fmt,
kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms);
avccKey = CFStringCreateWithCString (NULL, "avcC", kCFStringEncodingUTF8);
avcc = CFDictionaryGetValue (atoms, avccKey);
CFRelease (avccKey);
codec_data_size = CFDataGetLength (avcc);
codec_data = g_malloc (codec_data_size);
CFDataGetBytes (avcc, 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);
gst_buffer_unref (codec_data_buf);
}
result = gst_pad_push_event (self->srcpad, gst_event_new_caps (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;
}
OSStatus CMPVideoFormatDescriptionCopyExtradata(CFAllocatorRef allocator, CMVideoFormatDescriptionRef formatDescription, CFDataRef *outExtradata)
{
const FourCharCode mediaSubType = CMFormatDescriptionGetMediaSubType(formatDescription);
if(mediaSubType == kCMVideoCodecType_MPEG4Video || mediaSubType == kCMVideoCodecType_H264)
{
CFDictionaryRef atoms = CMFormatDescriptionGetExtension(formatDescription, kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms);
CFDataRef extradata = CFDictionaryGetValue(atoms, CFSTR("avcC"));
if(extradata == nil)
{
return CMPParameterError;
}
*outExtradata = CFDataCreateCopy(allocator, extradata);
return noErr;
}
else
{
*outExtradata = NULL;
return noErr;
}
}
