gstreamer/gst-libs/gst/gl/gstglmemorypbo.c

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/*
* GStreamer
* Copyright (C) 2012 Matthew Waters <ystreet00@gmail.com>
* Copyright (C) 2015 Matthew Waters <matthew@centricular.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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/video/video.h>
#include <gst/gl/gstglmemorypbo.h>
/**
* SECTION:gstglmemorypbo
* @title: GstGLMemoryPBO
* @short_description: memory subclass for GL textures
* @see_also: #GstMemory, #GstAllocator, #GstGLBufferPool
*
* #GstGLMemoryPBO is created or wrapped through gst_gl_base_memory_alloc()
* with #GstGLVideoAllocationParams.
*
* Data is uploaded or downloaded from the GPU as is necessary.
*/
/* Implementation notes
*
* PBO transfer's are implemented using GstGLBuffer. We just need to
* ensure that the texture data is written/read to/from before/after calling
* map (mem->pbo, READ) which performs the pbo buffer transfer.
*/
#define USING_OPENGL(context) (gst_gl_context_check_gl_version (context, GST_GL_API_OPENGL, 1, 0))
#define USING_OPENGL3(context) (gst_gl_context_check_gl_version (context, GST_GL_API_OPENGL3, 3, 1))
#define USING_GLES(context) (gst_gl_context_check_gl_version (context, GST_GL_API_GLES, 1, 0))
#define USING_GLES2(context) (gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 2, 0))
#define USING_GLES3(context) (gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 3, 0))
#define GL_MEM_HEIGHT(gl_mem) _get_plane_height (&gl_mem->mem.info, gl_mem->mem.plane)
#define GL_MEM_STRIDE(gl_mem) GST_VIDEO_INFO_PLANE_STRIDE (&gl_mem->mem.info, gl_mem->mem.plane)
#define CONTEXT_SUPPORTS_PBO_UPLOAD(context) \
(gst_gl_context_check_gl_version (context, \
GST_GL_API_OPENGL | GST_GL_API_OPENGL3, 2, 1) \
|| gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 3, 0))
#define CONTEXT_SUPPORTS_PBO_DOWNLOAD(context) \
(gst_gl_context_check_gl_version (context, \
GST_GL_API_OPENGL | GST_GL_API_OPENGL3 | GST_GL_API_GLES2, 3, 0))
GST_DEBUG_CATEGORY_STATIC (GST_CAT_GL_MEMORY);
#define GST_CAT_DEFAULT GST_CAT_GL_MEMORY
static GstAllocator *_gl_allocator;
/* compatability definitions... */
#ifndef GL_PIXEL_PACK_BUFFER
#define GL_PIXEL_PACK_BUFFER 0x88EB
#endif
#ifndef GL_PIXEL_UNPACK_BUFFER
#define GL_PIXEL_UNPACK_BUFFER 0x88EC
#endif
#ifndef GL_STREAM_READ
#define GL_STREAM_READ 0x88E1
#endif
#ifndef GL_STREAM_DRAW
#define GL_STREAM_DRAW 0x88E0
#endif
#ifndef GL_STREAM_COPY
#define GL_STREAM_COPY 0x88E2
#endif
#ifndef GL_UNPACK_ROW_LENGTH
#define GL_UNPACK_ROW_LENGTH 0x0CF2
#endif
#ifndef GL_TEXTURE_RECTANGLE
#define GL_TEXTURE_RECTANGLE 0x84F5
#endif
#ifndef GL_TEXTURE_EXTERNAL_OES
#define GL_TEXTURE_EXTERNAL_OES 0x8D65
#endif
#define parent_class gst_gl_memory_pbo_allocator_parent_class
G_DEFINE_TYPE (GstGLMemoryPBOAllocator, gst_gl_memory_pbo_allocator,
GST_TYPE_GL_MEMORY_ALLOCATOR);
typedef struct
{
/* in */
GstGLMemoryPBO *src;
GstGLFormat out_format;
guint out_width, out_height;
guint out_stride;
gboolean respecify;
GstGLTextureTarget tex_target;
/* inout */
guint tex_id;
/* out */
gboolean result;
} GstGLMemoryPBOCopyParams;
static inline guint
_get_plane_height (GstVideoInfo * info, guint plane)
{
if (GST_VIDEO_INFO_IS_YUV (info))
/* For now component width and plane width are the same and the
* plane-component mapping matches
*/
return GST_VIDEO_INFO_COMP_HEIGHT (info, plane);
else /* RGB, GRAY */
return GST_VIDEO_INFO_HEIGHT (info);
}
static void
_upload_pbo_memory (GstGLMemoryPBO * gl_mem, GstMapInfo * info,
GstGLBuffer * pbo, GstMapInfo * pbo_info)
{
GstGLContext *context = gl_mem->mem.mem.context;
const GstGLFuncs *gl;
guint pbo_id;
if (!GST_MEMORY_FLAG_IS_SET (gl_mem, GST_GL_BASE_MEMORY_TRANSFER_NEED_UPLOAD))
return;
g_return_if_fail (CONTEXT_SUPPORTS_PBO_UPLOAD (context));
gl = context->gl_vtable;
pbo_id = *(guint *) pbo_info->data;
GST_CAT_LOG (GST_CAT_GL_MEMORY, "upload for texture id:%u, with pbo %u %ux%u",
gl_mem->mem.tex_id, pbo_id, gl_mem->mem.tex_width,
GL_MEM_HEIGHT (gl_mem));
gl->BindBuffer (GL_PIXEL_UNPACK_BUFFER, pbo_id);
gst_gl_memory_texsubimage (GST_GL_MEMORY_CAST (gl_mem), NULL);
gl->BindBuffer (GL_PIXEL_UNPACK_BUFFER, 0);
}
static guint
_new_texture (GstGLContext * context, guint target, guint internal_format,
guint format, guint type, guint width, guint height)
{
const GstGLFuncs *gl = context->gl_vtable;
guint tex_id;
gl->GenTextures (1, &tex_id);
gl->BindTexture (target, tex_id);
if (target == GL_TEXTURE_2D || target == GL_TEXTURE_RECTANGLE)
gl->TexImage2D (target, 0, internal_format, width, height, 0, format, type,
NULL);
gl->TexParameteri (target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
gl->BindTexture (target, 0);
return tex_id;
}
static gboolean
_gl_mem_create (GstGLMemoryPBO * gl_mem, GError ** error)
{
GstGLContext *context = gl_mem->mem.mem.context;
GstGLBaseMemoryAllocatorClass *alloc_class;
alloc_class = GST_GL_BASE_MEMORY_ALLOCATOR_CLASS (parent_class);
if (!alloc_class->create ((GstGLBaseMemory *) gl_mem, error))
return FALSE;
if (CONTEXT_SUPPORTS_PBO_DOWNLOAD (context)
|| CONTEXT_SUPPORTS_PBO_UPLOAD (context)) {
GstAllocationParams alloc_params =
{ 0, GST_MEMORY_CAST (gl_mem)->align, 0, 0 };
GstGLBaseMemoryAllocator *buf_allocator;
GstGLBufferAllocationParams *params;
buf_allocator =
GST_GL_BASE_MEMORY_ALLOCATOR (gst_allocator_find
(GST_GL_BUFFER_ALLOCATOR_NAME));
params =
gst_gl_buffer_allocation_params_new (context,
GST_MEMORY_CAST (gl_mem)->size, &alloc_params, GL_PIXEL_UNPACK_BUFFER,
GL_STREAM_DRAW);
/* FIXME: lazy init this for resource constrained platforms
* Will need to fix pbo detection based on the existence of the mem.id then */
gl_mem->pbo = (GstGLBuffer *) gst_gl_base_memory_alloc (buf_allocator,
(GstGLAllocationParams *) params);
gst_gl_allocation_params_free ((GstGLAllocationParams *) params);
gst_object_unref (buf_allocator);
GST_CAT_LOG (GST_CAT_GL_MEMORY, "generated pbo %u", gl_mem->pbo->id);
}
return TRUE;
}
static gboolean
_read_pixels_to_pbo (GstGLMemoryPBO * gl_mem)
{
if (!gl_mem->pbo || !CONTEXT_SUPPORTS_PBO_DOWNLOAD (gl_mem->mem.mem.context)
|| gl_mem->mem.tex_format == GST_GL_LUMINANCE
|| gl_mem->mem.tex_format == GST_GL_LUMINANCE_ALPHA)
/* unsupported */
return FALSE;
if (GST_MEMORY_FLAG_IS_SET (gl_mem,
GST_GL_BASE_MEMORY_TRANSFER_NEED_DOWNLOAD)) {
/* copy texture data into into the pbo and map that */
gsize plane_start;
GstMapInfo pbo_info;
plane_start =
gst_gl_get_plane_start (&gl_mem->mem.info, &gl_mem->mem.valign,
gl_mem->mem.plane) + GST_MEMORY_CAST (gl_mem)->offset;
gl_mem->pbo->target = GL_PIXEL_PACK_BUFFER;
if (!gst_memory_map (GST_MEMORY_CAST (gl_mem->pbo), &pbo_info,
GST_MAP_WRITE | GST_MAP_GL)) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Failed to map pbo for writing");
return FALSE;
}
if (!gst_gl_memory_read_pixels ((GstGLMemory *) gl_mem,
(gpointer) plane_start)) {
gst_memory_unmap (GST_MEMORY_CAST (gl_mem->pbo), &pbo_info);
return FALSE;
}
gst_memory_unmap (GST_MEMORY_CAST (gl_mem->pbo), &pbo_info);
}
return TRUE;
}
static gpointer
_pbo_download_transfer (GstGLMemoryPBO * gl_mem, GstMapInfo * info, gsize size)
{
GstMapInfo *pbo_info;
gl_mem->pbo->target = GL_PIXEL_PACK_BUFFER;
/* texture -> pbo */
if (info->flags & GST_MAP_READ
&& GST_MEMORY_FLAG_IS_SET (gl_mem,
GST_GL_BASE_MEMORY_TRANSFER_NEED_DOWNLOAD)) {
GstMapInfo info;
GST_CAT_TRACE (GST_CAT_GL_MEMORY,
"attempting download of texture %u " "using pbo %u", gl_mem->mem.tex_id,
gl_mem->pbo->id);
if (!gst_memory_map (GST_MEMORY_CAST (gl_mem->pbo), &info,
GST_MAP_WRITE | GST_MAP_GL)) {
GST_CAT_WARNING (GST_CAT_GL_MEMORY, "Failed to write to PBO");
return NULL;
}
if (!_read_pixels_to_pbo (gl_mem)) {
gst_memory_unmap (GST_MEMORY_CAST (gl_mem->pbo), &info);
return NULL;
}
gst_memory_unmap (GST_MEMORY_CAST (gl_mem->pbo), &info);
}
pbo_info = g_new0 (GstMapInfo, 1);
/* pbo -> data */
/* get a cpu accessible mapping from the pbo */
if (!gst_memory_map (GST_MEMORY_CAST (gl_mem->pbo), pbo_info, info->flags)) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Failed to map pbo");
g_free (pbo_info);
return NULL;
}
info->user_data[0] = pbo_info;
return pbo_info->data;
}
static gpointer
_gl_mem_map_cpu_access (GstGLMemoryPBO * gl_mem, GstMapInfo * info, gsize size)
{
gpointer data = NULL;
gst_gl_base_memory_alloc_data ((GstGLBaseMemory *) gl_mem);
if (!data && gl_mem->pbo
&& CONTEXT_SUPPORTS_PBO_DOWNLOAD (gl_mem->mem.mem.context))
data = _pbo_download_transfer (gl_mem, info, size);
if (!data) {
GstGLMemoryAllocatorClass *alloc_class;
alloc_class = GST_GL_MEMORY_ALLOCATOR_CLASS (parent_class);
data = alloc_class->map ((GstGLBaseMemory *) gl_mem, info, size);
}
return data;
}
static gpointer
_gl_mem_map_gpu_access (GstGLMemoryPBO * gl_mem, GstMapInfo * info, gsize size)
{
gpointer data = &gl_mem->mem.tex_id;
if ((info->flags & GST_MAP_READ) == GST_MAP_READ) {
if (gl_mem->pbo && CONTEXT_SUPPORTS_PBO_UPLOAD (gl_mem->mem.mem.context)) {
GstMapInfo pbo_info;
/* data -> pbo */
if (!gst_memory_map (GST_MEMORY_CAST (gl_mem->pbo), &pbo_info,
GST_MAP_READ | GST_MAP_GL)) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Failed to map pbo");
return NULL;
}
/* pbo -> texture */
_upload_pbo_memory (gl_mem, info, gl_mem->pbo, &pbo_info);
gst_memory_unmap (GST_MEMORY_CAST (gl_mem->pbo), &pbo_info);
} else {
GstGLMemoryAllocatorClass *alloc_class;
alloc_class = GST_GL_MEMORY_ALLOCATOR_CLASS (parent_class);
data = alloc_class->map ((GstGLBaseMemory *) gl_mem, info, size);
}
}
return data;
}
static gpointer
_gl_mem_map (GstGLMemoryPBO * gl_mem, GstMapInfo * info, gsize maxsize)
{
gpointer data;
if ((info->flags & GST_MAP_GL) == GST_MAP_GL) {
if (gl_mem->mem.tex_target == GST_GL_TEXTURE_TARGET_EXTERNAL_OES)
return &gl_mem->mem.tex_id;
data = _gl_mem_map_gpu_access (gl_mem, info, maxsize);
} else { /* not GL */
if (gl_mem->mem.tex_target == GST_GL_TEXTURE_TARGET_EXTERNAL_OES) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Cannot map External OES textures");
return NULL;
}
data = _gl_mem_map_cpu_access (gl_mem, info, maxsize);
}
return data;
}
static void
_gl_mem_unmap_cpu_access (GstGLMemoryPBO * gl_mem, GstMapInfo * info)
{
if (!gl_mem->pbo || !CONTEXT_SUPPORTS_PBO_DOWNLOAD (gl_mem->mem.mem.context))
/* PBO's not supported */
return;
gl_mem->pbo->target = GL_PIXEL_PACK_BUFFER;
gst_memory_unmap (GST_MEMORY_CAST (gl_mem->pbo),
(GstMapInfo *) info->user_data[0]);
g_free (info->user_data[0]);
}
static void
_gl_mem_unmap (GstGLMemoryPBO * gl_mem, GstMapInfo * info)
{
if ((info->flags & GST_MAP_GL) == 0) {
_gl_mem_unmap_cpu_access (gl_mem, info);
}
}
static void
_gl_mem_copy_thread (GstGLContext * context, gpointer data)
{
const GstGLFuncs *gl;
GstGLMemoryPBOCopyParams *copy_params;
GstGLMemoryPBO *src;
guint tex_id;
guint out_tex_target;
GLuint fboId;
gsize out_width, out_height, out_stride;
GLuint out_gl_format, out_gl_type;
GLuint in_gl_format, in_gl_type;
gsize in_size, out_size;
copy_params = (GstGLMemoryPBOCopyParams *) data;
src = copy_params->src;
tex_id = copy_params->tex_id;
out_tex_target = gst_gl_texture_target_to_gl (copy_params->tex_target);
out_width = copy_params->out_width;
out_height = copy_params->out_height;
out_stride = copy_params->out_stride;
gl = context->gl_vtable;
out_gl_format = copy_params->out_format;
out_gl_type = GL_UNSIGNED_BYTE;
if (copy_params->out_format == GST_GL_RGB565)
out_gl_type = GL_UNSIGNED_SHORT_5_6_5;
in_gl_format = src->mem.tex_format;
in_gl_type = GL_UNSIGNED_BYTE;
if (src->mem.tex_format == GST_GL_RGB565)
in_gl_type = GL_UNSIGNED_SHORT_5_6_5;
if (!gl->GenFramebuffers) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY,
"Context, EXT_framebuffer_object not supported");
goto error;
}
in_size = GL_MEM_HEIGHT (src) * GL_MEM_STRIDE (src);
out_size = out_height * out_stride;
if (copy_params->respecify) {
if (in_size != out_size) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Cannot copy between textures with "
"backing data of different sizes. input %" G_GSIZE_FORMAT " output %"
G_GSIZE_FORMAT, in_size, out_size);
goto error;
}
}
if (!tex_id) {
guint internal_format;
guint out_gl_type;
out_gl_type = GL_UNSIGNED_BYTE;
if (copy_params->out_format == GST_GL_RGB565)
out_gl_type = GL_UNSIGNED_SHORT_5_6_5;
internal_format =
gst_gl_sized_gl_format_from_gl_format_type (context, out_gl_format,
out_gl_type);
tex_id =
_new_texture (context, out_tex_target,
internal_format, out_gl_format, out_gl_type, copy_params->out_width,
copy_params->out_height);
}
if (!tex_id) {
GST_WARNING ("Could not create GL texture with context:%p", context);
}
GST_LOG ("copying memory %p, tex %u into texture %i",
src, src->mem.tex_id, tex_id);
/* FIXME: try and avoid creating and destroying fbo's every copy... */
/* create a framebuffer object */
gl->GenFramebuffers (1, &fboId);
gl->BindFramebuffer (GL_FRAMEBUFFER, fboId);
gl->FramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
gst_gl_texture_target_to_gl (src->mem.tex_target), src->mem.tex_id, 0);
// if (!gst_gl_context_check_framebuffer_status (src->mem.mem.context))
// goto fbo_error;
gl->BindTexture (out_tex_target, tex_id);
if (copy_params->respecify) {
GstMapInfo pbo_info;
if (!gl->GenBuffers || !src->pbo) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Cannot reinterpret texture contents "
"without pixel buffer objects");
gl->BindTexture (out_tex_target, 0);
goto fbo_error;
}
if (gst_gl_context_get_gl_api (context) & GST_GL_API_GLES2
&& (in_gl_format != GL_RGBA || in_gl_type != GL_UNSIGNED_BYTE)) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Cannot copy non RGBA/UNSIGNED_BYTE "
"textures on GLES2");
gl->BindTexture (out_tex_target, 0);
goto fbo_error;
}
GST_TRACE ("copying texture data with size of %u*%u*%u",
gst_gl_format_type_n_bytes (in_gl_format, in_gl_type),
src->mem.tex_width, GL_MEM_HEIGHT (src));
/* copy tex */
_read_pixels_to_pbo (src);
src->pbo->target = GL_PIXEL_UNPACK_BUFFER;
if (!gst_memory_map (GST_MEMORY_CAST (src->pbo), &pbo_info,
GST_MAP_READ | GST_MAP_GL)) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Failed to map pbo for reading");
goto fbo_error;
}
gl->TexSubImage2D (out_tex_target, 0, 0, 0, out_width, out_height,
out_gl_format, out_gl_type, 0);
gst_memory_unmap (GST_MEMORY_CAST (src->pbo), &pbo_info);
} else { /* different sizes */
gst_gl_memory_copy_teximage (GST_GL_MEMORY_CAST (src),
tex_id, copy_params->tex_target, copy_params->out_format, out_width,
out_height);
}
gl->BindTexture (out_tex_target, 0);
gl->BindFramebuffer (GL_FRAMEBUFFER, 0);
gl->DeleteFramebuffers (1, &fboId);
copy_params->tex_id = tex_id;
copy_params->result = TRUE;
return;
/* ERRORS */
fbo_error:
{
gl->DeleteFramebuffers (1, &fboId);
copy_params->tex_id = 0;
copy_params->result = FALSE;
return;
}
error:
{
copy_params->result = FALSE;
return;
}
}
static GstMemory *
_gl_mem_copy (GstGLMemoryPBO * src, gssize offset, gssize size)
{
GstAllocationParams params = { 0, GST_MEMORY_CAST (src)->align, 0, 0 };
GstGLBaseMemoryAllocator *base_mem_allocator;
GstAllocator *allocator;
GstMemory *dest = NULL;
allocator = GST_MEMORY_CAST (src)->allocator;
base_mem_allocator = (GstGLBaseMemoryAllocator *) allocator;
if (src->mem.tex_target == GST_GL_TEXTURE_TARGET_EXTERNAL_OES) {
GST_CAT_ERROR (GST_CAT_GL_MEMORY, "Cannot copy External OES textures");
return NULL;
}
/* If not doing a full copy, then copy to sysmem, the 2D represention of the
* texture would become wrong */
if (offset > 0 || size < GST_MEMORY_CAST (src)->size) {
return base_mem_allocator->fallback_mem_copy (GST_MEMORY_CAST (src), offset,
size);
}
dest = (GstMemory *) g_new0 (GstGLMemoryPBO, 1);
gst_gl_memory_init (GST_GL_MEMORY_CAST (dest), allocator, NULL,
src->mem.mem.context, src->mem.tex_target, src->mem.tex_format, &params,
&src->mem.info, src->mem.plane, &src->mem.valign, NULL, NULL);
if (!GST_MEMORY_FLAG_IS_SET (src, GST_GL_BASE_MEMORY_TRANSFER_NEED_UPLOAD)) {
GstMapInfo dinfo;
if (!gst_memory_map (GST_MEMORY_CAST (dest), &dinfo,
GST_MAP_WRITE | GST_MAP_GL)) {
GST_CAT_WARNING (GST_CAT_GL_MEMORY,
"Failed not map destination " "for writing");
gst_memory_unref (GST_MEMORY_CAST (dest));
return NULL;
}
if (!gst_gl_memory_copy_into ((GstGLMemory *) src,
((GstGLMemory *) dest)->tex_id, src->mem.tex_target,
src->mem.tex_format, src->mem.tex_width, GL_MEM_HEIGHT (src))) {
GST_CAT_WARNING (GST_CAT_GL_MEMORY, "Could not copy GL Memory");
gst_memory_unmap (GST_MEMORY_CAST (dest), &dinfo);
goto memcpy;
}
gst_memory_unmap (GST_MEMORY_CAST (dest), &dinfo);
} else {
memcpy:
if (!gst_gl_base_memory_memcpy ((GstGLBaseMemory *) src,
(GstGLBaseMemory *) dest, offset, size)) {
GST_CAT_WARNING (GST_CAT_GL_MEMORY, "Could not copy GL Memory");
gst_memory_unref (GST_MEMORY_CAST (dest));
return NULL;
}
}
return dest;
}
static GstMemory *
_gl_mem_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params)
{
g_warning ("Use gst_gl_base_memory_alloc () to allocate from this "
"GstGLMemoryPBO allocator");
return NULL;
}
static void
_gl_mem_destroy (GstGLMemoryPBO * gl_mem)
{
if (gl_mem->pbo)
gst_memory_unref (GST_MEMORY_CAST (gl_mem->pbo));
gl_mem->pbo = NULL;
GST_GL_BASE_MEMORY_ALLOCATOR_CLASS (parent_class)->destroy ((GstGLBaseMemory
*) gl_mem);
}
static GstGLMemoryPBO *
_gl_mem_pbo_alloc (GstGLBaseMemoryAllocator * allocator,
GstGLVideoAllocationParams * params)
{
GstGLMemoryPBO *mem;
guint alloc_flags;
alloc_flags = params->parent.alloc_flags;
g_return_val_if_fail (alloc_flags & GST_GL_ALLOCATION_PARAMS_ALLOC_FLAG_VIDEO,
NULL);
mem = g_new0 (GstGLMemoryPBO, 1);
if (alloc_flags & GST_GL_ALLOCATION_PARAMS_ALLOC_FLAG_WRAP_GPU_HANDLE) {
mem->mem.tex_id = GPOINTER_TO_UINT (params->parent.gl_handle);
mem->mem.texture_wrapped = TRUE;
}
gst_gl_memory_init (GST_GL_MEMORY_CAST (mem), GST_ALLOCATOR_CAST (allocator),
NULL, params->parent.context, params->target, params->tex_format,
params->parent.alloc_params, params->v_info, params->plane,
params->valign, params->parent.user_data, params->parent.notify);
if (alloc_flags & GST_GL_ALLOCATION_PARAMS_ALLOC_FLAG_WRAP_GPU_HANDLE) {
GST_MINI_OBJECT_FLAG_SET (mem, GST_GL_BASE_MEMORY_TRANSFER_NEED_DOWNLOAD);
}
if (alloc_flags & GST_GL_ALLOCATION_PARAMS_ALLOC_FLAG_WRAP_SYSMEM) {
GST_MINI_OBJECT_FLAG_SET (mem, GST_GL_BASE_MEMORY_TRANSFER_NEED_UPLOAD);
if (mem->pbo) {
GST_MINI_OBJECT_FLAG_SET (mem->pbo,
GST_GL_BASE_MEMORY_TRANSFER_NEED_UPLOAD);
mem->pbo->mem.data = params->parent.wrapped_data;
}
mem->mem.mem.data = params->parent.wrapped_data;
}
return mem;
}
static void
gst_gl_memory_pbo_allocator_class_init (GstGLMemoryPBOAllocatorClass * klass)
{
GstGLBaseMemoryAllocatorClass *gl_base;
GstGLMemoryAllocatorClass *gl_tex;
GstAllocatorClass *allocator_class;
gl_tex = (GstGLMemoryAllocatorClass *) klass;
gl_base = (GstGLBaseMemoryAllocatorClass *) klass;
allocator_class = (GstAllocatorClass *) klass;
gl_base->alloc = (GstGLBaseMemoryAllocatorAllocFunction) _gl_mem_pbo_alloc;
gl_base->create = (GstGLBaseMemoryAllocatorCreateFunction) _gl_mem_create;
gl_tex->map = (GstGLBaseMemoryAllocatorMapFunction) _gl_mem_map;
gl_tex->unmap = (GstGLBaseMemoryAllocatorUnmapFunction) _gl_mem_unmap;
gl_tex->copy = (GstGLBaseMemoryAllocatorCopyFunction) _gl_mem_copy;
gl_base->destroy = (GstGLBaseMemoryAllocatorDestroyFunction) _gl_mem_destroy;
allocator_class->alloc = _gl_mem_alloc;
}
static void
gst_gl_memory_pbo_allocator_init (GstGLMemoryPBOAllocator * allocator)
{
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
alloc->mem_type = GST_GL_MEMORY_PBO_ALLOCATOR_NAME;
GST_OBJECT_FLAG_SET (allocator, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
}
/**
* gst_gl_memory_pbo_copy_into_texture:
* @gl_mem:a #GstGLMemoryPBO
* @tex_id: the destination texture id
* @target: the destination #GstGLTextureTarget
* @tex_format: the destination #GstGLFormat
* @width: width of @tex_id
* @height: height of @tex_id
* @stride: stride of the backing texture data
* @respecify: whether to copy the data or copy per texel
*
* Copies @gl_mem into the texture specfified by @tex_id. The format of @tex_id
* is specified by @tex_format, @width and @height.
*
* If @respecify is %TRUE, then the copy is performed in terms of the texture
* data. This is useful for splitting RGBA textures into RG or R textures or
* vice versa. The requirement for this to succeed is that the backing texture
* data must be the same size, i.e. say a RGBA8 texture is converted into a RG8
* texture, then the RG texture must have twice as many pixels available for
* output as the RGBA texture.
*
* Otherwise, if @respecify is %FALSE, then the copy is performed per texel
* using glCopyTexImage. See the OpenGL specification for details on the
* mappings between texture formats.
*
* Returns: Whether the copy suceeded
*
* Since: 1.8
*/
gboolean
gst_gl_memory_pbo_copy_into_texture (GstGLMemoryPBO * gl_mem, guint tex_id,
GstGLTextureTarget target, GstGLFormat tex_format, gint width,
gint height, gint stride, gboolean respecify)
{
GstGLMemoryPBOCopyParams copy_params;
copy_params.src = gl_mem;
copy_params.tex_target = target;
copy_params.tex_id = tex_id;
copy_params.out_format = tex_format;
copy_params.out_width = width;
copy_params.out_height = height;
copy_params.out_stride = stride;
copy_params.respecify = respecify;
gst_gl_context_thread_add (gl_mem->mem.mem.context, _gl_mem_copy_thread,
&copy_params);
return copy_params.result;
}
static void
_download_transfer (GstGLContext * context, GstGLMemoryPBO * gl_mem)
{
GstGLBaseMemory *mem = (GstGLBaseMemory *) gl_mem;
g_mutex_lock (&mem->lock);
if (_read_pixels_to_pbo (gl_mem)) {
GST_CAT_TRACE (GST_CAT_GL_MEMORY, "optimistic download of texture %u "
"using pbo %u", gl_mem->mem.tex_id, gl_mem->pbo->id);
GST_MEMORY_FLAG_UNSET (gl_mem, GST_GL_BASE_MEMORY_TRANSFER_NEED_DOWNLOAD);
}
g_mutex_unlock (&mem->lock);
}
/**
* gst_gl_memory_pbo_download_transfer:
* @gl_mem: a #GstGLMemoryPBO
*
* Transfer the texture data from the texture into the PBO if necessary.
*
* Since: 1.8
*/
void
gst_gl_memory_pbo_download_transfer (GstGLMemoryPBO * gl_mem)
{
g_return_if_fail (gst_is_gl_memory ((GstMemory *) gl_mem));
gst_gl_context_thread_add (gl_mem->mem.mem.context,
(GstGLContextThreadFunc) _download_transfer, gl_mem);
}
static void
_upload_transfer (GstGLContext * context, GstGLMemoryPBO * gl_mem)
{
GstGLBaseMemory *mem = (GstGLBaseMemory *) gl_mem;
GstMapInfo info;
g_mutex_lock (&mem->lock);
gl_mem->pbo->target = GL_PIXEL_UNPACK_BUFFER;
if (!gst_memory_map (GST_MEMORY_CAST (gl_mem->pbo), &info,
GST_MAP_READ | GST_MAP_GL)) {
GST_CAT_WARNING (GST_CAT_GL_MEMORY, "Failed to map pbo for reading");
} else {
gst_memory_unmap (GST_MEMORY_CAST (gl_mem->pbo), &info);
}
g_mutex_unlock (&mem->lock);
}
/**
* gst_gl_memory_pbo_upload_transfer:
* @gl_mem: a #GstGLMemoryPBO
*
* Transfer the texture data from the PBO into the texture if necessary.
*
* Since: 1.8
*/
void
gst_gl_memory_pbo_upload_transfer (GstGLMemoryPBO * gl_mem)
{
g_return_if_fail (gst_is_gl_memory ((GstMemory *) gl_mem));
if (gl_mem->pbo && CONTEXT_SUPPORTS_PBO_UPLOAD (gl_mem->mem.mem.context))
gst_gl_context_thread_add (gl_mem->mem.mem.context,
(GstGLContextThreadFunc) _upload_transfer, gl_mem);
}
/**
* gst_gl_memory_pbo_init:
*
* Initializes the GL Memory allocator. It is safe to call this function
* multiple times. This must be called before any other GstGLMemoryPBO operation.
*/
void
gst_gl_memory_pbo_init_once (void)
{
static volatile gsize _init = 0;
if (g_once_init_enter (&_init)) {
gst_gl_memory_init_once ();
GST_DEBUG_CATEGORY_INIT (GST_CAT_GL_MEMORY, "glmemory", 0, "OpenGL Memory");
_gl_allocator = g_object_new (GST_TYPE_GL_MEMORY_PBO_ALLOCATOR, NULL);
/* The allocator is never unreffed */
GST_OBJECT_FLAG_SET (_gl_allocator, GST_OBJECT_FLAG_MAY_BE_LEAKED);
gst_allocator_register (GST_GL_MEMORY_PBO_ALLOCATOR_NAME,
gst_object_ref (_gl_allocator));
g_once_init_leave (&_init, 1);
}
}
/**
* gst_is_gl_memory_pbo:
* @mem:a #GstMemory
*
* Returns: whether the memory at @mem is a #GstGLMemoryPBO
*
* Since: 1.8
*/
gboolean
gst_is_gl_memory_pbo (GstMemory * mem)
{
return mem != NULL && mem->allocator != NULL
&& g_type_is_a (G_OBJECT_TYPE (mem->allocator),
GST_TYPE_GL_MEMORY_PBO_ALLOCATOR);
}