GstBuffer *
gst_core_media_buffer_new (GstCoreMediaCtx * ctx, CMSampleBufferRef sample_buf)
{
GstCVApi *cv = ctx->cv;
GstCMApi *cm = ctx->cm;
CVImageBufferRef image_buf;
CVPixelBufferRef pixel_buf;
CMBlockBufferRef block_buf;
Byte *data = NULL;
UInt32 size;
OSStatus status;
GstBuffer *buf;
GstCoreMediaMeta *meta;
image_buf = cm->CMSampleBufferGetImageBuffer (sample_buf);
pixel_buf = NULL;
block_buf = cm->CMSampleBufferGetDataBuffer (sample_buf);
if (image_buf != NULL &&
CFGetTypeID (image_buf) == cv->CVPixelBufferGetTypeID ()) {
pixel_buf = (CVPixelBufferRef) image_buf;
if (cv->CVPixelBufferLockBaseAddress (pixel_buf,
kCVPixelBufferLock_ReadOnly) != kCVReturnSuccess) {
goto error;
}
if (cv->CVPixelBufferIsPlanar (pixel_buf)) {
gint plane_count, plane_idx;
data = cv->CVPixelBufferGetBaseAddressOfPlane (pixel_buf, 0);
size = 0;
plane_count = cv->CVPixelBufferGetPlaneCount (pixel_buf);
for (plane_idx = 0; plane_idx != plane_count; plane_idx++) {
size += cv->CVPixelBufferGetBytesPerRowOfPlane (pixel_buf, plane_idx) *
cv->CVPixelBufferGetHeightOfPlane (pixel_buf, plane_idx);
}
} else {
data = cv->CVPixelBufferGetBaseAddress (pixel_buf);
size = cv->CVPixelBufferGetBytesPerRow (pixel_buf) *
cv->CVPixelBufferGetHeight (pixel_buf);
}
} else if (block_buf != NULL) {
status = cm->CMBlockBufferGetDataPointer (block_buf, 0, 0, 0, &data);
if (status != noErr)
goto error;
size = cm->CMBlockBufferGetDataLength (block_buf);
} else {
goto error;
}
buf = gst_buffer_new ();
meta = (GstCoreMediaMeta *) gst_buffer_add_meta (buf,
gst_core_media_meta_get_info (), NULL);
meta->ctx = g_object_ref (ctx);
meta->sample_buf = cm->FigSampleBufferRetain (sample_buf);
meta->image_buf = image_buf;
meta->pixel_buf = pixel_buf;
meta->block_buf = block_buf;
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE, data,
size, 0, size, NULL, NULL));
return buf;
error:
return NULL;
}
GstBuffer *
gst_core_video_buffer_new (GstCoreMediaCtx * ctx, CVBufferRef cvbuf,
GstVideoInfo * vinfo)
{
GstCVApi *cv = ctx->cv;
void *data;
size_t size;
CVPixelBufferRef pixbuf = NULL;
GstBuffer *buf;
GstCoreVideoMeta *meta;
guint width, height, n_planes, i;
gsize offset[GST_VIDEO_MAX_PLANES];
gint stride[GST_VIDEO_MAX_PLANES];
if (CFGetTypeID (cvbuf) != cv->CVPixelBufferGetTypeID ())
/* TODO: Do we need to handle other buffer types? */
goto error;
pixbuf = (CVPixelBufferRef) cvbuf;
if (cv->CVPixelBufferLockBaseAddress (pixbuf,
kCVPixelBufferLock_ReadOnly) != kCVReturnSuccess) {
goto error;
}
buf = gst_buffer_new ();
/* add the corevideo meta to free the underlying corevideo buffer */
meta = (GstCoreVideoMeta *) gst_buffer_add_meta (buf,
gst_core_video_meta_get_info (), NULL);
meta->ctx = g_object_ref (ctx);
meta->cvbuf = cv->CVBufferRetain (cvbuf);
meta->pixbuf = pixbuf;
/* set stride, offset and size */
memset (&offset, 0, sizeof (offset));
memset (&stride, 0, sizeof (stride));
data = cv->CVPixelBufferGetBaseAddress (pixbuf);
height = cv->CVPixelBufferGetHeight (pixbuf);
if (cv->CVPixelBufferIsPlanar (pixbuf)) {
GstVideoInfo tmp_vinfo;
n_planes = cv->CVPixelBufferGetPlaneCount (pixbuf);
for (i = 0; i < n_planes; ++i)
stride[i] = cv->CVPixelBufferGetBytesPerRowOfPlane (pixbuf, i);
/* FIXME: don't hardcode NV12 */
gst_video_info_init (&tmp_vinfo);
gst_video_info_set_format (&tmp_vinfo,
GST_VIDEO_FORMAT_NV12, stride[0], height);
offset[1] = tmp_vinfo.offset[1];
size = tmp_vinfo.size;
} else {
n_planes = 1;
size = cv->CVPixelBufferGetBytesPerRow (pixbuf) * height;
}
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE, data,
size, 0, size, NULL, NULL));
if (vinfo) {
GstVideoMeta *video_meta;
width = vinfo->width;
video_meta =
gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_FORMAT_NV12, width, height, n_planes, offset, stride);
}
return buf;
error:
return NULL;
}
