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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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b4654f537f
As per Apple's docs, this may improve performance by avoiding redundant invalidations of existing caches of the buffer contents.
128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/*
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* Copyright (C) 2009 Ole André Vadla Ravnås <oravnas@cisco.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "coremediabuffer.h"
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G_DEFINE_TYPE (GstCoreMediaBuffer, gst_core_media_buffer, GST_TYPE_BUFFER);
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static void
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gst_core_media_buffer_init (GstCoreMediaBuffer * self)
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{
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GST_BUFFER_FLAG_SET (self, GST_BUFFER_FLAG_READONLY);
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}
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static void
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gst_core_media_buffer_finalize (GstMiniObject * mini_object)
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{
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GstCoreMediaBuffer *self = GST_CORE_MEDIA_BUFFER_CAST (mini_object);
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if (self->image_buf != NULL) {
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GstCVApi *cv = self->ctx->cv;
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cv->CVPixelBufferUnlockBaseAddress (self->image_buf,
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kCVPixelBufferLock_ReadOnly);
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}
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self->ctx->cm->FigSampleBufferRelease (self->sample_buf);
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g_object_unref (self->ctx);
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GST_MINI_OBJECT_CLASS (gst_core_media_buffer_parent_class)->finalize
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(mini_object);
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}
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GstBuffer *
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gst_core_media_buffer_new (GstCoreMediaCtx * ctx, CMSampleBufferRef sample_buf)
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{
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GstCVApi *cv = ctx->cv;
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GstCMApi *cm = ctx->cm;
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CVImageBufferRef image_buf;
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CVPixelBufferRef pixel_buf;
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CMBlockBufferRef block_buf;
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Byte *data = NULL;
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UInt32 size;
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OSStatus status;
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GstCoreMediaBuffer *buf;
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image_buf = cm->CMSampleBufferGetImageBuffer (sample_buf);
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pixel_buf = NULL;
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block_buf = cm->CMSampleBufferGetDataBuffer (sample_buf);
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if (image_buf != NULL &&
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CFGetTypeID (image_buf) == cv->CVPixelBufferGetTypeID ()) {
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pixel_buf = (CVPixelBufferRef) image_buf;
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if (cv->CVPixelBufferLockBaseAddress (pixel_buf,
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kCVPixelBufferLock_ReadOnly) != kCVReturnSuccess) {
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goto error;
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}
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if (cv->CVPixelBufferIsPlanar (pixel_buf)) {
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gint plane_count, plane_idx;
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data = cv->CVPixelBufferGetBaseAddressOfPlane (pixel_buf, 0);
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size = 0;
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plane_count = cv->CVPixelBufferGetPlaneCount (pixel_buf);
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for (plane_idx = 0; plane_idx != plane_count; plane_idx++) {
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size += cv->CVPixelBufferGetBytesPerRowOfPlane (pixel_buf, plane_idx) *
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cv->CVPixelBufferGetHeightOfPlane (pixel_buf, plane_idx);
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}
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} else {
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data = cv->CVPixelBufferGetBaseAddress (pixel_buf);
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size = cv->CVPixelBufferGetBytesPerRow (pixel_buf) *
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cv->CVPixelBufferGetHeight (pixel_buf);
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}
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} else if (block_buf != NULL) {
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status = cm->CMBlockBufferGetDataPointer (block_buf, 0, 0, 0, &data);
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if (status != noErr)
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goto error;
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size = cm->CMBlockBufferGetDataLength (block_buf);
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} else {
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goto error;
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}
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buf =
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GST_CORE_MEDIA_BUFFER (gst_mini_object_new (GST_TYPE_CORE_MEDIA_BUFFER));
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buf->ctx = g_object_ref (ctx);
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buf->sample_buf = cm->FigSampleBufferRetain (sample_buf);
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buf->image_buf = image_buf;
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buf->pixel_buf = pixel_buf;
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buf->block_buf = block_buf;
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GST_BUFFER_DATA (buf) = data;
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GST_BUFFER_SIZE (buf) = size;
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return GST_BUFFER_CAST (buf);
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error:
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return NULL;
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}
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CVPixelBufferRef
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gst_core_media_buffer_get_pixel_buffer (GstCoreMediaBuffer * buf)
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{
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return buf->ctx->cv->CVPixelBufferRetain (buf->pixel_buf);
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}
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static void
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gst_core_media_buffer_class_init (GstCoreMediaBufferClass * klass)
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{
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GstMiniObjectClass *miniobject_class = GST_MINI_OBJECT_CLASS (klass);
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miniobject_class->finalize = gst_core_media_buffer_finalize;
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}
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