gstreamer/sys/applemedia/coremediabuffer.c
Sebastian Dröge bee1477f08 applemedia: We need to map the coremedia buffers in non-readonly mode
Our buffers claim to be writable so other elements expect to be able
to write there without losing their changes.
2014-09-19 14:47:04 +03:00

318 lines
8.4 KiB
C

/*
* Copyright (C) 2009 Ole André Vadla Ravnås <oleavr@soundrop.com>
* Copyright (C) 2014 Collabora Ltd.
* Authors: Matthieu Bouron <matthieu.bouron@collabora.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "coremediabuffer.h"
static void
gst_core_media_meta_free (GstCoreMediaMeta * meta, GstBuffer * buf)
{
if (meta->image_buf != NULL) {
CVPixelBufferUnlockBaseAddress (meta->image_buf, 0);
CVBufferRelease (meta->image_buf);
}
if (meta->block_buf != NULL) {
CFRelease (meta->block_buf);
}
CFRelease (meta->sample_buf);
}
GType
gst_core_media_meta_api_get_type (void)
{
static volatile GType type;
static const gchar *tags[] = { "memory", NULL };
if (g_once_init_enter (&type)) {
GType _type = gst_meta_api_type_register ("GstCoreMediaMetaAPI", tags);
g_once_init_leave (&type, _type);
}
return type;
}
static const GstMetaInfo *
gst_core_media_meta_get_info (void)
{
static const GstMetaInfo *core_media_meta_info = NULL;
if (g_once_init_enter (&core_media_meta_info)) {
const GstMetaInfo *meta = gst_meta_register (GST_CORE_MEDIA_META_API_TYPE,
"GstCoreMediaMeta", sizeof (GstCoreMediaMeta),
(GstMetaInitFunction) NULL,
(GstMetaFreeFunction) gst_core_media_meta_free,
(GstMetaTransformFunction) NULL);
g_once_init_leave (&core_media_meta_info, meta);
}
return core_media_meta_info;
}
static GstVideoFormat
gst_core_media_buffer_get_video_format (OSType format)
{
switch (format) {
case kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange:
return GST_VIDEO_FORMAT_NV12;
case kCVPixelFormatType_422YpCbCr8_yuvs:
return GST_VIDEO_FORMAT_YUY2;
case kCVPixelFormatType_422YpCbCr8:
return GST_VIDEO_FORMAT_UYVY;
case kCVPixelFormatType_32BGRA:
return GST_VIDEO_FORMAT_BGRA;
default:
GST_WARNING ("Unknown OSType format: %d", (gint) format);
return GST_VIDEO_FORMAT_UNKNOWN;
}
}
static gboolean
gst_core_media_buffer_wrap_pixel_buffer (GstBuffer * buf, GstVideoInfo * info,
CVPixelBufferRef pixel_buf, gboolean * has_padding)
{
guint n_planes;
gsize offset[GST_VIDEO_MAX_PLANES] = { 0 };
gint stride[GST_VIDEO_MAX_PLANES] = { 0 };
GstVideoMeta *video_meta;
UInt32 size;
if (CVPixelBufferLockBaseAddress (pixel_buf, 0) != kCVReturnSuccess) {
GST_ERROR ("Could not lock pixel buffer base address");
return FALSE;
}
*has_padding = FALSE;
if (CVPixelBufferIsPlanar (pixel_buf)) {
gint i, size = 0, plane_offset = 0;
n_planes = CVPixelBufferGetPlaneCount (pixel_buf);
for (i = 0; i < n_planes; i++) {
stride[i] = CVPixelBufferGetBytesPerRowOfPlane (pixel_buf, i);
if (stride[i] != GST_VIDEO_INFO_PLANE_STRIDE (info, i)) {
*has_padding = TRUE;
}
size = stride[i] * CVPixelBufferGetHeightOfPlane (pixel_buf, i);
offset[i] = plane_offset;
plane_offset += size;
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
CVPixelBufferGetBaseAddressOfPlane (pixel_buf, i), size, 0, size,
NULL, NULL));
}
} else {
n_planes = 1;
stride[0] = CVPixelBufferGetBytesPerRow (pixel_buf);
offset[0] = 0;
size = stride[0] * CVPixelBufferGetHeight (pixel_buf);
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
CVPixelBufferGetBaseAddress (pixel_buf), size, 0, size, NULL,
NULL));
}
video_meta =
gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_INFO_FORMAT (info), info->width, info->height, n_planes, offset,
stride);
return TRUE;
}
static gboolean
gst_core_media_buffer_wrap_block_buffer (GstBuffer * buf,
CMBlockBufferRef block_buf)
{
OSStatus status;
gchar *data = NULL;
UInt32 size;
status = CMBlockBufferGetDataPointer (block_buf, 0, 0, 0, &data);
if (status != noErr) {
return FALSE;
}
size = CMBlockBufferGetDataLength (block_buf);
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE, data,
size, 0, size, NULL, NULL));
return TRUE;
}
static GstBuffer *
gst_core_media_buffer_new_from_buffer (GstBuffer * buf, GstVideoInfo * info)
{
gboolean ret;
GstBuffer *copy_buf;
GstVideoFrame dest, src;
GstAllocator *allocator;
allocator = gst_allocator_find (GST_ALLOCATOR_SYSMEM);
if (!allocator) {
GST_ERROR ("Could not find SYSMEM allocator");
return NULL;
}
copy_buf = gst_buffer_new_allocate (allocator, info->size, NULL);
gst_object_unref (allocator);
if (!gst_video_frame_map (&dest, info, copy_buf, GST_MAP_WRITE)) {
GST_ERROR ("Could not map destination frame");
goto error;
}
if (!gst_video_frame_map (&src, info, buf, GST_MAP_READ)) {
GST_ERROR ("Could not map source frame");
gst_video_frame_unmap (&dest);
goto error;
}
ret = gst_video_frame_copy (&dest, &src);
gst_video_frame_unmap (&dest);
gst_video_frame_unmap (&src);
if (!ret) {
GST_ERROR ("Could not copy frame");
goto error;
}
return copy_buf;
error:
if (copy_buf) {
gst_buffer_unref (copy_buf);
}
return NULL;
}
static gboolean
gst_video_info_init_from_pixel_buffer (GstVideoInfo * info,
CVPixelBufferRef pixel_buf)
{
size_t width, height;
OSType format_type;
GstVideoFormat video_format;
width = CVPixelBufferGetWidth (pixel_buf);
height = CVPixelBufferGetHeight (pixel_buf);
format_type = CVPixelBufferGetPixelFormatType (pixel_buf);
video_format = gst_core_media_buffer_get_video_format (format_type);
if (video_format == GST_VIDEO_FORMAT_UNKNOWN) {
return FALSE;
}
gst_video_info_init (info);
gst_video_info_set_format (info, video_format, width, height);
return TRUE;
}
GstBuffer *
gst_core_media_buffer_new (CMSampleBufferRef sample_buf,
gboolean use_video_meta)
{
CVImageBufferRef image_buf;
CVPixelBufferRef pixel_buf;
CMBlockBufferRef block_buf;
GstCoreMediaMeta *meta;
GstBuffer *buf;
image_buf = CMSampleBufferGetImageBuffer (sample_buf);
pixel_buf = NULL;
block_buf = CMSampleBufferGetDataBuffer (sample_buf);
buf = gst_buffer_new ();
meta = (GstCoreMediaMeta *) gst_buffer_add_meta (buf,
gst_core_media_meta_get_info (), NULL);
CFRetain (sample_buf);
if (image_buf)
CVBufferRetain (image_buf);
if (block_buf)
CFRetain (block_buf);
meta->sample_buf = sample_buf;
meta->image_buf = image_buf;
meta->pixel_buf = pixel_buf;
meta->block_buf = block_buf;
if (image_buf != NULL && CFGetTypeID (image_buf) == CVPixelBufferGetTypeID ()) {
GstVideoInfo info;
gboolean has_padding = FALSE;
pixel_buf = (CVPixelBufferRef) image_buf;
if (!gst_video_info_init_from_pixel_buffer (&info, pixel_buf)) {
goto error;
}
if (!gst_core_media_buffer_wrap_pixel_buffer (buf, &info, pixel_buf,
&has_padding)) {
goto error;
}
/* If the video meta API is not supported, remove padding by
* copying the core media buffer to a system memory buffer */
if (has_padding && !use_video_meta) {
GstBuffer *copy_buf;
copy_buf = gst_core_media_buffer_new_from_buffer (buf, &info);
if (!copy_buf) {
goto error;
}
gst_buffer_unref (buf);
buf = copy_buf;
}
} else if (block_buf != NULL) {
if (!gst_core_media_buffer_wrap_block_buffer (buf, block_buf)) {
goto error;
}
} else {
goto error;
}
return buf;
error:
if (buf) {
gst_buffer_unref (buf);
}
return NULL;
}
CVPixelBufferRef
gst_core_media_buffer_get_pixel_buffer (GstBuffer * buf)
{
GstCoreMediaMeta *meta = (GstCoreMediaMeta *) gst_buffer_get_meta (buf,
GST_CORE_MEDIA_META_API_TYPE);
g_return_val_if_fail (meta != NULL, NULL);
return CVPixelBufferRetain (meta->pixel_buf);
}