mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-23 08:46:40 +00:00
applemedia: implement GstAppleCoreVideoMemory
Implement a new memory type wrapping CVPixelBuffer.
There are two immediate advantages:
a) Make the GstMemory itself retain the CVPixelBuffer. Previously,
the containing GstBuffer was solely responsible for the lifetime of
the backing CVPixelBuffer.
With this change, we remove the GST_MEMORY_FLAG_NO_SHARE so that
GstMemory objects be referenced by multiple GstBuffers (doing away
with the need to copy.)
b) Delay locking CVPixelBuffer into CPU memory until it's actually
mapped -- possibly never.
The CVPixelBuffer object is shared among references, shares and
(in planar formats) planes, so a wrapper GstAppleCoreVideoPixelBuffer
structure was introduced to manage locking.
https://bugzilla.gnome.org/show_bug.cgi?id=747216
This commit is contained in:
Ilya Konstantinov
Alessandro Decina
parent
ed7df2da3c
commit
936b2fdfbc
7 changed files with 659 additions and 127 deletions
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@ -3,6 +3,7 @@ plugin_LTLIBRARIES = libgstapplemedia.la
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libgstapplemedia_la_SOURCES = \
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plugin.m \
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vtutil.c \
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corevideomemory.c \
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corevideobuffer.c \
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coremediabuffer.c \
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videotexturecache.m \
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@ -19,13 +19,14 @@
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* Boston, MA 02110-1301, USA.
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*/
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#include "corevideobuffer.h"
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#include "coremediabuffer.h"
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#include "corevideomemory.h"
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static void
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gst_core_media_meta_free (GstCoreMediaMeta * meta, GstBuffer * buf)
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{
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if (meta->image_buf != NULL) {
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CVPixelBufferUnlockBaseAddress (meta->image_buf, 0);
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CVBufferRelease (meta->image_buf);
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}
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if (meta->block_buf != NULL) {
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@ -84,68 +85,6 @@ gst_core_media_buffer_get_video_format (OSType format)
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}
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}
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static gboolean
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gst_core_media_buffer_wrap_pixel_buffer (GstBuffer * buf, GstVideoInfo * info,
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CVPixelBufferRef pixel_buf, gboolean * has_padding, gboolean map)
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{
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guint n_planes;
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gsize offset[GST_VIDEO_MAX_PLANES] = { 0 };
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gint stride[GST_VIDEO_MAX_PLANES] = { 0 };
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GstVideoMeta *video_meta;
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UInt32 size;
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if (map && CVPixelBufferLockBaseAddress (pixel_buf, 0) != kCVReturnSuccess) {
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GST_ERROR ("Could not lock pixel buffer base address");
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return FALSE;
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}
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*has_padding = FALSE;
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if (CVPixelBufferIsPlanar (pixel_buf)) {
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gint i, size = 0, plane_offset = 0;
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n_planes = CVPixelBufferGetPlaneCount (pixel_buf);
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for (i = 0; i < n_planes; i++) {
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stride[i] = CVPixelBufferGetBytesPerRowOfPlane (pixel_buf, i);
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if (stride[i] != GST_VIDEO_INFO_PLANE_STRIDE (info, i)) {
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*has_padding = TRUE;
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}
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size = stride[i] * CVPixelBufferGetHeightOfPlane (pixel_buf, i);
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offset[i] = plane_offset;
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plane_offset += size;
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if (map) {
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gst_buffer_append_memory (buf,
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gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
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CVPixelBufferGetBaseAddressOfPlane (pixel_buf, i), size, 0,
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size, NULL, NULL));
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}
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}
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} else {
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n_planes = 1;
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stride[0] = CVPixelBufferGetBytesPerRow (pixel_buf);
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offset[0] = 0;
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size = stride[0] * CVPixelBufferGetHeight (pixel_buf);
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if (map) {
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gst_buffer_append_memory (buf,
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gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
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CVPixelBufferGetBaseAddress (pixel_buf), size, 0, size, NULL,
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NULL));
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}
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}
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video_meta =
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gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
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GST_VIDEO_INFO_FORMAT (info), info->width, info->height, n_planes, offset,
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stride);
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return TRUE;
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}
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static gboolean
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gst_core_media_buffer_wrap_block_buffer (GstBuffer * buf,
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CMBlockBufferRef block_buf)
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@ -280,10 +219,8 @@ gst_core_media_buffer_new (CMSampleBufferRef sample_buf,
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goto error;
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}
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if (!gst_core_media_buffer_wrap_pixel_buffer (buf, &info, meta->pixel_buf,
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&has_padding, map)) {
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goto error;
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}
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gst_core_video_wrap_pixel_buffer (buf, &info, meta->pixel_buf, &has_padding,
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map);
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/* If the video meta API is not supported, remove padding by
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* copying the core media buffer to a system memory buffer */
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@ -18,14 +18,11 @@
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*/
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#include "corevideobuffer.h"
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#include "corevideomemory.h"
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static void
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gst_core_video_meta_free (GstCoreVideoMeta * meta, GstBuffer * buf)
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{
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if (meta->pixbuf != NULL) {
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CVPixelBufferUnlockBaseAddress (meta->pixbuf, 0);
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}
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CVBufferRelease (meta->cvbuf);
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}
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@ -58,6 +55,74 @@ gst_core_video_meta_get_info (void)
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return core_video_meta_info;
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}
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void
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gst_core_video_wrap_pixel_buffer (GstBuffer * buf, GstVideoInfo * info,
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CVPixelBufferRef pixel_buf, gboolean * has_padding, gboolean map)
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{
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guint n_planes;
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gsize offset[GST_VIDEO_MAX_PLANES] = { 0 };
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gint stride[GST_VIDEO_MAX_PLANES] = { 0 };
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UInt32 size;
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*has_padding = FALSE;
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if (CVPixelBufferIsPlanar (pixel_buf)) {
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gint i, size = 0, plane_offset = 0;
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GstAppleCoreVideoPixelBuffer *gpixbuf;
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if (map) {
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gpixbuf = gst_apple_core_video_pixel_buffer_new (pixel_buf);
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}
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n_planes = CVPixelBufferGetPlaneCount (pixel_buf);
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for (i = 0; i < n_planes; i++) {
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stride[i] = CVPixelBufferGetBytesPerRowOfPlane (pixel_buf, i);
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if (stride[i] != GST_VIDEO_INFO_PLANE_STRIDE (info, i)) {
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*has_padding = TRUE;
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}
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size = stride[i] * CVPixelBufferGetHeightOfPlane (pixel_buf, i);
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offset[i] = plane_offset;
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plane_offset += size;
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if (map) {
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gst_buffer_append_memory (buf,
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gst_apple_core_video_memory_new_wrapped (gpixbuf, i, size));
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}
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}
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if (map) {
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gst_apple_core_video_pixel_buffer_unref (gpixbuf);
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}
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} else {
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n_planes = 1;
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stride[0] = CVPixelBufferGetBytesPerRow (pixel_buf);
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offset[0] = 0;
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size = stride[0] * CVPixelBufferGetHeight (pixel_buf);
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if (map) {
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GstAppleCoreVideoPixelBuffer *gpixbuf;
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gpixbuf = gst_apple_core_video_pixel_buffer_new (pixel_buf);
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gst_buffer_append_memory (buf,
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gst_apple_core_video_memory_new_wrapped (gpixbuf,
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GST_APPLE_CORE_VIDEO_NO_PLANE, size));
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gst_apple_core_video_pixel_buffer_unref (gpixbuf);
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}
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}
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if (info) {
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GstVideoMeta *video_meta;
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video_meta =
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gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
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GST_VIDEO_INFO_FORMAT (info), info->width, info->height, n_planes,
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offset, stride);
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}
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}
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GstBuffer *
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gst_core_video_buffer_new (CVBufferRef cvbuf, GstVideoInfo * vinfo,
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gboolean map)
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@ -65,20 +130,14 @@ gst_core_video_buffer_new (CVBufferRef cvbuf, GstVideoInfo * vinfo,
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CVPixelBufferRef pixbuf = NULL;
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GstBuffer *buf;
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GstCoreVideoMeta *meta;
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guint n_planes;
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gsize offset[GST_VIDEO_MAX_PLANES];
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gint stride[GST_VIDEO_MAX_PLANES];
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gboolean has_padding; /* not used for now */
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if (CFGetTypeID (cvbuf) != CVPixelBufferGetTypeID ())
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/* TODO: Do we need to handle other buffer types? */
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goto error;
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return NULL;
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pixbuf = (CVPixelBufferRef) cvbuf;
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if (map && CVPixelBufferLockBaseAddress (pixbuf, 0) != kCVReturnSuccess) {
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goto error;
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}
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buf = gst_buffer_new ();
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/* add the corevideo meta to free the underlying corevideo buffer */
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@ -87,54 +146,7 @@ gst_core_video_buffer_new (CVBufferRef cvbuf, GstVideoInfo * vinfo,
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meta->cvbuf = CVBufferRetain (cvbuf);
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meta->pixbuf = pixbuf;
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/* set stride, offset and size */
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memset (&offset, 0, sizeof (offset));
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memset (&stride, 0, sizeof (stride));
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if (CVPixelBufferIsPlanar (pixbuf)) {
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int i, size, off;
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n_planes = CVPixelBufferGetPlaneCount (pixbuf);
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off = 0;
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for (i = 0; i < n_planes; ++i) {
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stride[i] = CVPixelBufferGetBytesPerRowOfPlane (pixbuf, i);
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size = stride[i] * CVPixelBufferGetHeightOfPlane (pixbuf, i);
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offset[i] = off;
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off += size;
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if (map) {
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gst_buffer_append_memory (buf,
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gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
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CVPixelBufferGetBaseAddressOfPlane (pixbuf, i), size, 0, size,
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NULL, NULL));
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}
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}
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} else {
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int size;
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n_planes = 1;
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stride[0] = CVPixelBufferGetBytesPerRow (pixbuf);
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offset[0] = 0;
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size = stride[0] * CVPixelBufferGetHeight (pixbuf);
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if (map) {
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gst_buffer_append_memory (buf,
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gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
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CVPixelBufferGetBaseAddress (pixbuf), size, 0, size, NULL, NULL));
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}
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}
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if (vinfo) {
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GstVideoMeta *video_meta;
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video_meta =
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gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
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vinfo->finfo->format, CVPixelBufferGetWidth (pixbuf),
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CVPixelBufferGetHeight (pixbuf), n_planes, offset, stride);
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}
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gst_core_video_wrap_pixel_buffer (buf, vinfo, pixbuf, &has_padding, map);
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return buf;
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error:
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return NULL;
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}
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@ -43,6 +43,11 @@ typedef struct _GstCoreVideoMeta
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GstBuffer * gst_core_video_buffer_new (CVBufferRef cvbuf,
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GstVideoInfo *info,
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gboolean map);
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void gst_core_video_wrap_pixel_buffer (GstBuffer * buf,
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GstVideoInfo * info,
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CVPixelBufferRef pixel_buf,
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gboolean * has_padding,
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gboolean map);
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GType gst_core_video_meta_api_get_type (void);
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G_END_DECLS
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465
sys/applemedia/corevideomemory.c
Normal file
465
sys/applemedia/corevideomemory.c
Normal file
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@ -0,0 +1,465 @@
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/* GStreamer Apple Core Video memory
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* Copyright (C) 2015 Ilya Konstantinov
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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 mordetails.
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "corevideomemory.h"
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_APPLE_CORE_VIDEO_MEMORY);
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#define GST_CAT_DEFAULT GST_CAT_APPLE_CORE_VIDEO_MEMORY
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static const char *_lock_state_names[] = {
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"Unlocked", "Locked Read-Only", "Locked Read-Write"
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};
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/**
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* gst_apple_core_video_pixel_buffer_new:
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* @buf: an unlocked CVPixelBuffer
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*
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* Initializes a wrapper to manage locking state for a CVPixelBuffer.
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* This function expects to receive unlocked CVPixelBuffer, and further assumes
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* that no one else will lock it (as long as the wrapper exists).
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*
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* This function retains @buf.
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*
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* Returns: The wrapped @buf.
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*/
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GstAppleCoreVideoPixelBuffer *
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gst_apple_core_video_pixel_buffer_new (CVPixelBufferRef buf)
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{
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GstAppleCoreVideoPixelBuffer *gpixbuf =
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g_slice_new (GstAppleCoreVideoPixelBuffer);
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gpixbuf->refcount = 1;
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g_mutex_init (&gpixbuf->mutex);
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gpixbuf->buf = CVPixelBufferRetain (buf);
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gpixbuf->lock_state = GST_APPLE_CORE_VIDEO_MEMORY_UNLOCKED;
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gpixbuf->lock_count = 0;
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return gpixbuf;
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}
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GstAppleCoreVideoPixelBuffer *
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gst_apple_core_video_pixel_buffer_ref (GstAppleCoreVideoPixelBuffer * gpixbuf)
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{
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g_atomic_int_inc (&gpixbuf->refcount);
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return gpixbuf;
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}
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void
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gst_apple_core_video_pixel_buffer_unref (GstAppleCoreVideoPixelBuffer * gpixbuf)
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{
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if (g_atomic_int_dec_and_test (&gpixbuf->refcount)) {
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if (gpixbuf->lock_state != GST_APPLE_CORE_VIDEO_MEMORY_UNLOCKED) {
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GST_ERROR
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("%p: CVPixelBuffer memory still locked (lock_count = %d), likely forgot to unmap GstAppleCoreVideoMemory",
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gpixbuf, gpixbuf->lock_count);
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}
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CVPixelBufferRelease (gpixbuf->buf);
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g_mutex_clear (&gpixbuf->mutex);
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g_slice_free (GstAppleCoreVideoPixelBuffer, gpixbuf);
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}
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}
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/**
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* gst_apple_core_video_pixel_buffer_lock:
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* @gpixbuf: the wrapped CVPixelBuffer
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* @flags: mapping flags for either read-only or read-write locking
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*
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* Locks the pixel buffer into CPU memory for reading only, or
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* reading and writing. The desired lock mode is deduced from @flags.
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*
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* For planar buffers, each plane's #GstAppleCoreVideoMemory will reference
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* the same #GstAppleCoreVideoPixelBuffer; therefore this function will be
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* called multiple times for the same @gpixbuf. Each call to this function
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* should be matched by a call to gst_apple_core_video_pixel_buffer_unlock().
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*
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* Notes:
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*
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* - Read-only locking improves performance by preventing Core Video
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* from invalidating existing caches of the buffer’s contents.
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*
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* - Only the first call actually locks; subsequent calls succeed
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* as long as their requested flags are compatible with how the buffer
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* is already locked.
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*
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* For example, the following code will succeed:
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* |[<!-- language="C" -->
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* gst_memory_map(plane1, GST_MAP_READWRITE);
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* gst_memory_map(plane2, GST_MAP_READ);
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* ]|
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* while the ƒollowing code will fail:
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* |[<!-- language="C" -->
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* gst_memory_map(plane1, GST_MAP_READ);
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* gst_memory_map(plane2, GST_MAP_READWRITE); /<!-- -->* ERROR: already locked for read-only *<!-- -->/
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* ]|
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*
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* Returns: %TRUE if the buffer was locked as requested
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*/
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static gboolean
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gst_apple_core_video_pixel_buffer_lock (GstAppleCoreVideoPixelBuffer * gpixbuf,
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GstMapFlags flags)
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{
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CVReturn cvret;
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CVOptionFlags lockFlags;
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g_mutex_lock (&gpixbuf->mutex);
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switch (gpixbuf->lock_state) {
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case GST_APPLE_CORE_VIDEO_MEMORY_UNLOCKED:
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lockFlags = (flags & GST_MAP_WRITE) ? 0 : kCVPixelBufferLock_ReadOnly;
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cvret = CVPixelBufferLockBaseAddress (gpixbuf->buf, lockFlags);
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if (cvret != kCVReturnSuccess) {
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g_mutex_unlock (&gpixbuf->mutex);
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/* TODO: Map kCVReturnError etc. into strings */
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GST_ERROR ("%p: unable to lock base address for pixbuf %p: %d", gpixbuf,
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gpixbuf->buf, cvret);
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return FALSE;
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}
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gpixbuf->lock_state =
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(flags & GST_MAP_WRITE) ?
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GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READ_WRITE :
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GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READONLY;
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break;
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case GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READONLY:
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if (flags & GST_MAP_WRITE) {
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g_mutex_unlock (&gpixbuf->mutex);
|
||||
GST_ERROR ("%p: pixel buffer %p already locked for read-only access",
|
||||
gpixbuf, gpixbuf->buf);
|
||||
return FALSE;
|
||||
}
|
||||
break;
|
||||
|
||||
case GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READ_WRITE:
|
||||
break; /* nothing to do, already most permissive mapping */
|
||||
}
|
||||
|
||||
g_atomic_int_inc (&gpixbuf->lock_count);
|
||||
|
||||
g_mutex_unlock (&gpixbuf->mutex);
|
||||
|
||||
GST_DEBUG ("%p: pixbuf %p, %s (%d times)",
|
||||
gpixbuf,
|
||||
gpixbuf->buf,
|
||||
_lock_state_names[gpixbuf->lock_state], gpixbuf->lock_count);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
/**
|
||||
* gst_apple_core_video_pixel_buffer_unlock:
|
||||
* @gpixbuf: the wrapped CVPixelBuffer
|
||||
*
|
||||
* Unlocks the pixel buffer from CPU memory. Should be called
|
||||
* for every gst_apple_core_video_pixel_buffer_lock() call.
|
||||
*/
|
||||
static gboolean
|
||||
gst_apple_core_video_pixel_buffer_unlock (GstAppleCoreVideoPixelBuffer *
|
||||
gpixbuf)
|
||||
{
|
||||
CVOptionFlags lockFlags;
|
||||
CVReturn cvret;
|
||||
|
||||
if (gpixbuf->lock_state == GST_APPLE_CORE_VIDEO_MEMORY_UNLOCKED) {
|
||||
GST_ERROR ("%p: pixel buffer %p not locked", gpixbuf, gpixbuf->buf);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
if (!g_atomic_int_dec_and_test (&gpixbuf->lock_count)) {
|
||||
return TRUE; /* still locked, by current and/or other callers */
|
||||
}
|
||||
|
||||
g_mutex_lock (&gpixbuf->mutex);
|
||||
|
||||
lockFlags =
|
||||
(gpixbuf->lock_state ==
|
||||
GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READONLY) ? kCVPixelBufferLock_ReadOnly
|
||||
: 0;
|
||||
cvret = CVPixelBufferUnlockBaseAddress (gpixbuf->buf, lockFlags);
|
||||
if (cvret != kCVReturnSuccess) {
|
||||
g_mutex_unlock (&gpixbuf->mutex);
|
||||
g_atomic_int_inc (&gpixbuf->lock_count);
|
||||
/* TODO: Map kCVReturnError etc. into strings */
|
||||
GST_ERROR ("%p: unable to unlock base address for pixbuf %p: %d", gpixbuf,
|
||||
gpixbuf->buf, cvret);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
gpixbuf->lock_state = GST_APPLE_CORE_VIDEO_MEMORY_UNLOCKED;
|
||||
|
||||
g_mutex_unlock (&gpixbuf->mutex);
|
||||
|
||||
GST_DEBUG ("%p: pixbuf %p, %s (%d locks remaining)",
|
||||
gpixbuf,
|
||||
gpixbuf->buf,
|
||||
_lock_state_names[gpixbuf->lock_state], gpixbuf->lock_count);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
/*
|
||||
* GstAppleCoreVideoAllocator
|
||||
*/
|
||||
|
||||
struct _GstAppleCoreVideoAllocatorClass
|
||||
{
|
||||
GstAllocatorClass parent_class;
|
||||
};
|
||||
|
||||
typedef struct _GstAppleCoreVideoAllocatorClass GstAppleCoreVideoAllocatorClass;
|
||||
|
||||
struct _GstAppleCoreVideoAllocator
|
||||
{
|
||||
GstAllocator parent_instance;
|
||||
};
|
||||
|
||||
typedef struct _GstAppleCoreVideoAllocator GstAppleCoreVideoAllocator;
|
||||
|
||||
/* GType for GstAppleCoreVideoAllocator */
|
||||
GType gst_apple_core_video_allocator_get_type (void);
|
||||
#define GST_TYPE_APPLE_CORE_VIDEO_ALLOCATOR (gst_apple_core_video_allocator_get_type())
|
||||
#define GST_IS_APPLE_CORE_VIDEO_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_APPLE_CORE_VIDEO_ALLOCATOR))
|
||||
#define GST_IS_APPLE_CORE_VIDEO_ALLOCATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_APPLE_CORE_VIDEO_ALLOCATOR))
|
||||
#define GST_APPLE_CORE_VIDEO_ALLOCATOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_APPLE_CORE_VIDEO_ALLOCATOR, GstAppleCoreVideoAllocatorClass))
|
||||
#define GST_APPLE_CORE_VIDEO_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_APPLE_CORE_VIDEO_ALLOCATOR, GstAppleCoreVideoAllocator))
|
||||
#define GST_APPLE_CORE_VIDEO_ALLOCATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_APPLE_CORE_VIDEO_ALLOCATOR, GstAppleCoreVideoAllocatorClass))
|
||||
|
||||
G_DEFINE_TYPE (GstAppleCoreVideoAllocator, gst_apple_core_video_allocator,
|
||||
GST_TYPE_ALLOCATOR);
|
||||
|
||||
/* Name for allocator registration */
|
||||
#define GST_APPLE_CORE_VIDEO_ALLOCATOR_NAME "AppleCoreVideoMemory"
|
||||
|
||||
/* Singleton instance of GstAppleCoreVideoAllocator */
|
||||
static GstAppleCoreVideoAllocator *_apple_core_video_allocator;
|
||||
|
||||
/**
|
||||
* gst_apple_core_video_memory_init:
|
||||
*
|
||||
* Initializes the Core Video Memory allocator. This function must be called
|
||||
* before #GstAppleCoreVideoMemory can be created.
|
||||
*
|
||||
* It is safe to call this function multiple times.
|
||||
*/
|
||||
void
|
||||
gst_apple_core_video_memory_init (void)
|
||||
{
|
||||
static volatile gsize _init = 0;
|
||||
|
||||
if (g_once_init_enter (&_init)) {
|
||||
GST_DEBUG_CATEGORY_INIT (GST_CAT_APPLE_CORE_VIDEO_MEMORY, "corevideomemory",
|
||||
0, "Apple Core Video Memory");
|
||||
|
||||
_apple_core_video_allocator =
|
||||
g_object_new (GST_TYPE_APPLE_CORE_VIDEO_ALLOCATOR, NULL);
|
||||
|
||||
gst_allocator_register (GST_APPLE_CORE_VIDEO_ALLOCATOR_NAME,
|
||||
gst_object_ref (_apple_core_video_allocator));
|
||||
g_once_init_leave (&_init, 1);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* gst_is_apple_core_video_memory:
|
||||
* @mem: #GstMemory
|
||||
*
|
||||
* Checks whether @mem is backed by a CVPixelBuffer.
|
||||
* This has limited use since #GstAppleCoreVideoMemory is transparently
|
||||
* mapped into CPU memory on request.
|
||||
*
|
||||
* Returns: %TRUE when @mem is backed by a CVPixelBuffer
|
||||
*/
|
||||
gboolean
|
||||
gst_is_apple_core_video_memory (GstMemory * mem)
|
||||
{
|
||||
g_return_val_if_fail (mem != NULL, FALSE);
|
||||
|
||||
return GST_IS_APPLE_CORE_VIDEO_ALLOCATOR (mem->allocator);
|
||||
}
|
||||
|
||||
/**
|
||||
* gst_apple_core_video_memory_new:
|
||||
*
|
||||
* Helper function for gst_apple_core_video_mem_share().
|
||||
* Users should call gst_apple_core_video_memory_new_wrapped() instead.
|
||||
*/
|
||||
static GstMemory *
|
||||
gst_apple_core_video_memory_new (GstMemoryFlags flags, GstMemory * parent,
|
||||
GstAppleCoreVideoPixelBuffer * gpixbuf, gsize plane, gsize maxsize,
|
||||
gsize align, gsize offset, gsize size)
|
||||
{
|
||||
GstAppleCoreVideoMemory *mem;
|
||||
|
||||
g_return_val_if_fail (gpixbuf != NULL, NULL);
|
||||
|
||||
mem = g_slice_new0 (GstAppleCoreVideoMemory);
|
||||
gst_memory_init (GST_MEMORY_CAST (mem), flags,
|
||||
GST_ALLOCATOR_CAST (_apple_core_video_allocator), parent, maxsize, align,
|
||||
offset, size);
|
||||
|
||||
mem->gpixbuf = gst_apple_core_video_pixel_buffer_ref (gpixbuf);
|
||||
mem->plane = plane;
|
||||
|
||||
GST_DEBUG ("%p: gpixbuf %p, plane: %" G_GSSIZE_FORMAT ", size %"
|
||||
G_GSIZE_FORMAT, mem, mem->gpixbuf, mem->plane, mem->mem.size);
|
||||
|
||||
return (GstMemory *) mem;
|
||||
}
|
||||
|
||||
/**
|
||||
* gst_apple_core_video_memory_new_wrapped:
|
||||
* @gpixbuf: the backing #GstAppleCoreVideoPixelBuffer
|
||||
* @plane: the plane this memory will represent, or #GST_APPLE_CORE_VIDEO_NO_PLANE for non-planar buffer
|
||||
* @size: the size of the buffer or specific plane
|
||||
*
|
||||
* Returns: a newly allocated #GstAppleCoreVideoMemory
|
||||
*/
|
||||
GstMemory *
|
||||
gst_apple_core_video_memory_new_wrapped (GstAppleCoreVideoPixelBuffer * gpixbuf,
|
||||
gsize plane, gsize size)
|
||||
{
|
||||
return gst_apple_core_video_memory_new (0, NULL, gpixbuf, plane, size, 0, 0,
|
||||
size);
|
||||
}
|
||||
|
||||
static gpointer
|
||||
gst_apple_core_video_mem_map (GstMemory * gmem, gsize maxsize,
|
||||
GstMapFlags flags)
|
||||
{
|
||||
GstAppleCoreVideoMemory *mem = (GstAppleCoreVideoMemory *) gmem;
|
||||
gpointer ret;
|
||||
|
||||
if (!gst_apple_core_video_pixel_buffer_lock (mem->gpixbuf, flags))
|
||||
return NULL;
|
||||
|
||||
if (mem->plane != GST_APPLE_CORE_VIDEO_NO_PLANE) {
|
||||
ret = CVPixelBufferGetBaseAddressOfPlane (mem->gpixbuf->buf, mem->plane);
|
||||
|
||||
if (ret != NULL)
|
||||
GST_DEBUG ("%p: pixbuf %p plane %" G_GSIZE_FORMAT
|
||||
" flags %08x: mapped %p", mem, mem->gpixbuf->buf, mem->plane, flags,
|
||||
ret);
|
||||
else
|
||||
GST_ERROR ("%p: invalid plane base address (NULL) for pixbuf %p plane %"
|
||||
G_GSIZE_FORMAT, mem, mem->gpixbuf->buf, mem->plane);
|
||||
} else {
|
||||
ret = CVPixelBufferGetBaseAddress (mem->gpixbuf->buf);
|
||||
|
||||
if (ret != NULL)
|
||||
GST_DEBUG ("%p: pixbuf %p flags %08x: mapped %p", mem, mem->gpixbuf->buf,
|
||||
flags, ret);
|
||||
else
|
||||
GST_ERROR ("%p: invalid base address (NULL) for pixbuf %p"
|
||||
G_GSIZE_FORMAT, mem, mem->gpixbuf->buf);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void
|
||||
gst_apple_core_video_mem_unmap (GstMemory * gmem)
|
||||
{
|
||||
GstAppleCoreVideoMemory *mem = (GstAppleCoreVideoMemory *) gmem;
|
||||
(void) gst_apple_core_video_pixel_buffer_unlock (mem->gpixbuf);
|
||||
if (mem->plane != GST_APPLE_CORE_VIDEO_NO_PLANE)
|
||||
GST_DEBUG ("%p: pixbuf %p plane %" G_GSIZE_FORMAT, mem,
|
||||
mem->gpixbuf->buf, mem->plane);
|
||||
else
|
||||
GST_DEBUG ("%p: pixbuf %p", mem, mem->gpixbuf->buf);
|
||||
}
|
||||
|
||||
static GstMemory *
|
||||
gst_apple_core_video_mem_share (GstMemory * gmem, gssize offset, gssize size)
|
||||
{
|
||||
GstAppleCoreVideoMemory *mem;
|
||||
GstMemory *parent, *sub;
|
||||
|
||||
mem = (GstAppleCoreVideoMemory *) gmem;
|
||||
|
||||
/* find the real parent */
|
||||
parent = gmem->parent;
|
||||
if (parent == NULL)
|
||||
parent = gmem;
|
||||
|
||||
if (size == -1)
|
||||
size = gmem->size - offset;
|
||||
|
||||
/* the shared memory is always readonly */
|
||||
sub =
|
||||
gst_apple_core_video_memory_new (GST_MINI_OBJECT_FLAGS (parent) |
|
||||
GST_MINI_OBJECT_FLAG_LOCK_READONLY, parent, mem->gpixbuf, mem->plane,
|
||||
gmem->maxsize, gmem->align, gmem->offset + offset, size);
|
||||
|
||||
return sub;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
gst_apple_core_video_mem_is_span (GstMemory * mem1, GstMemory * mem2,
|
||||
gsize * offset)
|
||||
{
|
||||
/* We may only return FALSE since:
|
||||
* 1) Core Video gives no guarantees about planes being consecutive.
|
||||
* We may only know this after mapping.
|
||||
* 2) GstAppleCoreVideoMemory instances for planes do not share a common
|
||||
* parent -- i.e. they're not offsets into the same parent
|
||||
* memory instance.
|
||||
*
|
||||
* It's not unlikely that planes will be stored in consecutive memory
|
||||
* but it should be checked by the user after mapping.
|
||||
*/
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
static void
|
||||
gst_apple_core_video_mem_free (GstAllocator * allocator, GstMemory * gmem)
|
||||
{
|
||||
GstAppleCoreVideoMemory *mem = (GstAppleCoreVideoMemory *) gmem;
|
||||
|
||||
gst_apple_core_video_pixel_buffer_unref (mem->gpixbuf);
|
||||
|
||||
g_slice_free (GstAppleCoreVideoMemory, mem);
|
||||
}
|
||||
|
||||
static void
|
||||
gst_apple_core_video_allocator_class_init (GstAppleCoreVideoAllocatorClass *
|
||||
klass)
|
||||
{
|
||||
GstAllocatorClass *allocator_class;
|
||||
|
||||
allocator_class = (GstAllocatorClass *) klass;
|
||||
|
||||
/* we don't do allocations, only wrap existing pixel buffers */
|
||||
allocator_class->alloc = NULL;
|
||||
allocator_class->free = gst_apple_core_video_mem_free;
|
||||
}
|
||||
|
||||
static void
|
||||
gst_apple_core_video_allocator_init (GstAppleCoreVideoAllocator * allocator)
|
||||
{
|
||||
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
|
||||
|
||||
alloc->mem_type = GST_APPLE_CORE_VIDEO_ALLOCATOR_NAME;
|
||||
alloc->mem_map = gst_apple_core_video_mem_map;
|
||||
alloc->mem_unmap = gst_apple_core_video_mem_unmap;
|
||||
alloc->mem_share = gst_apple_core_video_mem_share;
|
||||
alloc->mem_is_span = gst_apple_core_video_mem_is_span;
|
||||
|
||||
GST_OBJECT_FLAG_SET (allocator, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
|
||||
}
|
||||
109
sys/applemedia/corevideomemory.h
Normal file
109
sys/applemedia/corevideomemory.h
Normal file
|
|
@ -0,0 +1,109 @@
|
|||
/* GStreamer Apple Core Video memory
|
||||
* Copyright (C) 2015 Ilya Konstantinov
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef __GST_APPLE_CORE_VIDEO_MEMORY_H__
|
||||
#define __GST_APPLE_CORE_VIDEO_MEMORY_H__
|
||||
|
||||
#include <gst/gst.h>
|
||||
|
||||
#include "CoreVideo/CoreVideo.h"
|
||||
|
||||
G_BEGIN_DECLS
|
||||
|
||||
/**
|
||||
* GstAppleCoreVideoLockState:
|
||||
*
|
||||
* Specifies whether the backing CVPixelBuffer is locked for read-only
|
||||
* or read-write.
|
||||
*
|
||||
* Locking for reading only improves performance by preventing
|
||||
* Core Video from invalidating existing caches of the buffer’s contents.
|
||||
*/
|
||||
typedef enum
|
||||
{
|
||||
GST_APPLE_CORE_VIDEO_MEMORY_UNLOCKED,
|
||||
GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READONLY,
|
||||
GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READ_WRITE
|
||||
} GstAppleCoreVideoLockState;
|
||||
|
||||
/**
|
||||
* GstAppleCoreVideoPixelBuffer:
|
||||
*
|
||||
* This structure wraps CVPixelBuffer, managing its lock states and reference count.
|
||||
* It will be referenced by one or more #GstAppleCoreVideoMemory.
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
guint refcount;
|
||||
GMutex mutex;
|
||||
CVPixelBufferRef buf;
|
||||
/* Allows mem_map to refuse Read-Write locking a buffer that was previously
|
||||
* locked for Read-Only. */
|
||||
GstAppleCoreVideoLockState lock_state;
|
||||
/* Counts the number of times the buffer was locked.
|
||||
* Only the first lock affects whether it's just for reading
|
||||
* or for reading and writing, as reflected in @lock_state. */
|
||||
guint lock_count;
|
||||
} GstAppleCoreVideoPixelBuffer;
|
||||
|
||||
/**
|
||||
* GST_APPLE_CORE_VIDEO_NO_PLANE:
|
||||
*
|
||||
* Indicates a non-planar pixel buffer.
|
||||
*/
|
||||
#define GST_APPLE_CORE_VIDEO_NO_PLANE ((size_t)-1)
|
||||
|
||||
/**
|
||||
* GstAppleCoreVideoMemory:
|
||||
*
|
||||
* Represents a video plane or an entire (non-planar) video image,
|
||||
* backed by a CVPixelBuffer.
|
||||
*
|
||||
* This structure shares a #GstAppleCoreVideoPixelBuffer instance
|
||||
* with other instances.
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
GstMemory mem;
|
||||
|
||||
GstAppleCoreVideoPixelBuffer *gpixbuf;
|
||||
size_t plane;
|
||||
} GstAppleCoreVideoMemory;
|
||||
|
||||
void
|
||||
gst_apple_core_video_memory_init (void);
|
||||
|
||||
GstAppleCoreVideoPixelBuffer *
|
||||
gst_apple_core_video_pixel_buffer_new (CVPixelBufferRef pixbuf);
|
||||
|
||||
GstAppleCoreVideoPixelBuffer *
|
||||
gst_apple_core_video_pixel_buffer_ref (GstAppleCoreVideoPixelBuffer * shared);
|
||||
|
||||
void
|
||||
gst_apple_core_video_pixel_buffer_unref (GstAppleCoreVideoPixelBuffer * shared);
|
||||
|
||||
gboolean
|
||||
gst_is_apple_core_video_memory (GstMemory * mem);
|
||||
|
||||
GstMemory *
|
||||
gst_apple_core_video_memory_new_wrapped (GstAppleCoreVideoPixelBuffer * shared, gsize plane, gsize size);
|
||||
|
||||
G_END_DECLS
|
||||
|
||||
#endif /* __GST_APPLE_CORE_VIDEO_MEMORY_H__ */
|
||||
|
|
@ -22,6 +22,7 @@
|
|||
#endif
|
||||
|
||||
#include <Foundation/Foundation.h>
|
||||
#include "corevideomemory.h"
|
||||
#ifdef HAVE_IOS
|
||||
#include "iosassetsrc.h"
|
||||
#else
|
||||
|
|
@ -63,6 +64,8 @@ plugin_init (GstPlugin * plugin)
|
|||
{
|
||||
gboolean res = TRUE;
|
||||
|
||||
gst_apple_core_video_memory_init ();
|
||||
|
||||
#ifdef HAVE_IOS
|
||||
res &= gst_element_register (plugin, "iosassetsrc", GST_RANK_SECONDARY,
|
||||
GST_TYPE_IOS_ASSET_SRC);
|
||||
|
|
|
|||
Loading…
Reference in a new issue