static void
gst_core_media_meta_add (GstBuffer * buffer, CMSampleBufferRef sample_buf,
CVImageBufferRef image_buf, CMBlockBufferRef block_buf)
{
GstCoreMediaMeta *meta;
meta =
(GstCoreMediaMeta *) gst_buffer_add_meta (buffer,
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->block_buf = block_buf;
if (image_buf != NULL && CFGetTypeID (image_buf) == CVPixelBufferGetTypeID ())
meta->pixel_buf = (CVPixelBufferRef) image_buf;
else
meta->pixel_buf = NULL;
}
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_media_buffer_new (CMSampleBufferRef sample_buf,
gboolean use_video_meta, gboolean map)
{
CVImageBufferRef image_buf;
CMBlockBufferRef block_buf;
GstCoreMediaMeta *meta;
GstBuffer *buf;
image_buf = CMSampleBufferGetImageBuffer (sample_buf);
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 = NULL;
meta->block_buf = block_buf;
if (image_buf != NULL && CFGetTypeID (image_buf) == CVPixelBufferGetTypeID ()) {
GstVideoInfo info;
gboolean has_padding = FALSE;
meta->pixel_buf = (CVPixelBufferRef) image_buf;
if (!gst_video_info_init_from_pixel_buffer (&info, meta->pixel_buf)) {
goto error;
}
if (!gst_core_media_buffer_wrap_pixel_buffer (buf, &info, meta->pixel_buf,
&has_padding, map)) {
goto error;
}
/* If the video meta API is not supported, remove padding by
* copying the core media buffer to a system memory buffer */
if (map && 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 (map && !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;
}
