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gstreamer/gst-libs/gst/gl/gstglmemory.c
Matthew Waters 0b5c7e8b49 gl/docs: update some doc comments
2017-12-09 19:31:58 +00:00

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/*
* GStreamer
* Copyright (C) 2012 Matthew Waters <ystreet00@gmail.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 "gstglmemory.h"
#include "gstglutils.h"
/**
* SECTION:gstglmemory
* @short_description: memory subclass for GL textures
* @see_also: #GstMemory, #GstAllocator, #GstGLBufferPool
*
* GstGLMemory is a #GstMemory subclass providing support for the mapping of
* GL textures.
*
* #GstGLMemory is created through gst_gl_memory_alloc() or system memory can
* be wrapped through gst_gl_memory_wrapped().
*
* Data is uploaded or downloaded from the GPU as is necessary.
*/
#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_WIDTH(gl_mem) _get_plane_width (&gl_mem->info, gl_mem->plane)
#define GL_MEM_HEIGHT(gl_mem) _get_plane_height (&gl_mem->info, gl_mem->plane)
#define GL_MEM_STRIDE(gl_mem) GST_VIDEO_INFO_PLANE_STRIDE (&gl_mem->info, gl_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_RED
#define GL_RED 0x1903
#endif
#ifndef GL_RG
#define GL_RG 0x8227
#endif
#ifndef GL_R8
#define GL_R8 0x8229
#endif
#ifndef GL_RG8
#define GL_RG8 0x822B
#endif
#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_MAP_READ_BIT
#define GL_MAP_READ_BIT 0x0001
#endif
#ifndef GL_MAP_WRITE_BIT
#define GL_MAP_WRITE_BIT 0x0002
#endif
typedef struct
{
/* in */
GstGLMemory *src;
GstVideoGLTextureType out_format;
guint out_width, out_height;
guint out_stride;
gboolean respecify;
guint tex_target;
/* inout */
guint tex_id;
/* out */
gboolean result;
} GstGLMemoryCopyParams;
static inline guint
_gl_format_n_components (guint format)
{
switch (format) {
case GST_VIDEO_GL_TEXTURE_TYPE_RGBA:
case GL_RGBA:
return 4;
case GST_VIDEO_GL_TEXTURE_TYPE_RGB:
case GST_VIDEO_GL_TEXTURE_TYPE_RGB16:
case GL_RGB:
return 3;
case GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE_ALPHA:
case GST_VIDEO_GL_TEXTURE_TYPE_RG:
case GL_LUMINANCE_ALPHA:
case GL_RG:
return 2;
case GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE:
case GST_VIDEO_GL_TEXTURE_TYPE_R:
case GL_LUMINANCE:
case GL_RED:
return 1;
default:
return 0;
}
}
static inline guint
_gl_type_n_components (guint type)
{
switch (type) {
case GL_UNSIGNED_BYTE:
return 1;
case GL_UNSIGNED_SHORT_5_6_5:
return 3;
default:
g_assert_not_reached ();
return 0;
}
}
static inline guint
_gl_type_n_bytes (guint type)
{
switch (type) {
case GL_UNSIGNED_BYTE:
return 1;
case GL_UNSIGNED_SHORT_5_6_5:
return 2;
default:
g_assert_not_reached ();
return 0;
}
}
static inline guint
_gl_format_type_n_bytes (guint format, guint type)
{
return _gl_format_n_components (format) / _gl_type_n_components (type) *
_gl_type_n_bytes (type);
}
static inline GLenum
_gst_gl_format_from_gl_texture_type (GstVideoGLTextureType tex_format)
{
switch (tex_format) {
case GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE_ALPHA:
return GL_LUMINANCE_ALPHA;
case GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE:
return GL_LUMINANCE;
case GST_VIDEO_GL_TEXTURE_TYPE_RGBA:
return GL_RGBA;
case GST_VIDEO_GL_TEXTURE_TYPE_RGB:
case GST_VIDEO_GL_TEXTURE_TYPE_RGB16:
return GL_RGB;
case GST_VIDEO_GL_TEXTURE_TYPE_RG:
return GL_RG;
case GST_VIDEO_GL_TEXTURE_TYPE_R:
return GL_RED;
default:
return GST_VIDEO_GL_TEXTURE_TYPE_RGBA;
}
}
static inline guint
_gl_texture_type_n_bytes (GstVideoGLTextureType tex_format)
{
guint format, type;
format = _gst_gl_format_from_gl_texture_type (tex_format);
type = GL_UNSIGNED_BYTE;
if (tex_format == GST_VIDEO_GL_TEXTURE_TYPE_RGB16)
type = GL_UNSIGNED_SHORT_5_6_5;
return _gl_format_type_n_bytes (format, type);
}
GstVideoGLTextureType
gst_gl_texture_type_from_format (GstGLContext * context,
GstVideoFormat v_format, guint plane)
{
#if GST_GL_HAVE_PLATFORM_EAGL
gboolean texture_rg = FALSE;
#else
gboolean texture_rg =
gst_gl_context_check_feature (context, "GL_EXT_texture_rg")
|| gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 3, 0)
|| gst_gl_context_check_feature (context, "GL_ARB_texture_rg")
|| gst_gl_context_check_gl_version (context, GST_GL_API_OPENGL3, 3, 0);
#endif
guint n_plane_components;
switch (v_format) {
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_AYUV:
n_plane_components = 4;
break;
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
n_plane_components = 3;
break;
case GST_VIDEO_FORMAT_RGB16:
case GST_VIDEO_FORMAT_BGR16:
return GST_VIDEO_GL_TEXTURE_TYPE_RGB16;
case GST_VIDEO_FORMAT_GRAY16_BE:
case GST_VIDEO_FORMAT_GRAY16_LE:
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
n_plane_components = 2;
break;
case GST_VIDEO_FORMAT_NV12:
case GST_VIDEO_FORMAT_NV21:
n_plane_components = plane == 0 ? 1 : 2;
break;
case GST_VIDEO_FORMAT_GRAY8:
case GST_VIDEO_FORMAT_Y444:
case GST_VIDEO_FORMAT_Y42B:
case GST_VIDEO_FORMAT_Y41B:
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
n_plane_components = 1;
break;
default:
n_plane_components = 4;
g_assert_not_reached ();
break;
}
switch (n_plane_components) {
case 4:
return GST_VIDEO_GL_TEXTURE_TYPE_RGBA;
break;
case 3:
return GST_VIDEO_GL_TEXTURE_TYPE_RGB;
break;
case 2:
return texture_rg ? GST_VIDEO_GL_TEXTURE_TYPE_RG :
GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE_ALPHA;
break;
case 1:
return texture_rg ? GST_VIDEO_GL_TEXTURE_TYPE_R :
GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE;
break;
default:
g_assert_not_reached ();
break;
}
return GST_VIDEO_GL_TEXTURE_TYPE_RGBA;
}
static inline GLenum
_sized_gl_format_from_gl_format_type (GstGLContext * context, GLenum format,
GLenum type)
{
gboolean ext_texture_rg =
gst_gl_context_check_feature (context, "GL_EXT_texture_rg");
switch (format) {
case GL_RGBA:
switch (type) {
case GL_UNSIGNED_BYTE:
return GL_RGBA8;
break;
}
break;
case GL_RGB:
switch (type) {
case GL_UNSIGNED_BYTE:
return GL_RGB8;
break;
case GL_UNSIGNED_SHORT_5_6_5:
return GL_RGB;
break;
}
break;
case GL_RG:
switch (type) {
case GL_UNSIGNED_BYTE:
if (ext_texture_rg)
return GL_RG;
return GL_RG8;
break;
}
break;
case GL_RED:
switch (type) {
case GL_UNSIGNED_BYTE:
if (ext_texture_rg)
return GL_RED;
return GL_R8;
break;
}
break;
case GL_LUMINANCE:
return GL_LUMINANCE;
break;
case GL_LUMINANCE_ALPHA:
return GL_LUMINANCE_ALPHA;
break;
case GL_ALPHA:
return GL_ALPHA;
break;
default:
break;
}
g_assert_not_reached ();
return 0;
}
static inline guint
_get_plane_width (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_WIDTH (info, plane);
else /* RGB, GRAY */
return GST_VIDEO_INFO_WIDTH (info);
}
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);
}
typedef struct _GenTexture
{
guint width, height;
GLenum gl_target;
GLenum gl_format;
GLenum gl_type;
guint result;
} GenTexture;
static void
_generate_texture (GstGLContext * context, GenTexture * data)
{
const GstGLFuncs *gl = context->gl_vtable;
GLenum internal_format;
GST_TRACE ("Generating texture format:%u type:%u dimensions:%ux%u",
data->gl_format, data->gl_type, data->width, data->height);
internal_format =
_sized_gl_format_from_gl_format_type (context, data->gl_format,
data->gl_type);
gl->GenTextures (1, &data->result);
gl->BindTexture (data->gl_target, data->result);
gl->TexImage2D (data->gl_target, 0, internal_format, data->width,
data->height, 0, data->gl_format, data->gl_type, NULL);
gl->TexParameteri (data->gl_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (data->gl_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (data->gl_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (data->gl_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
GST_LOG ("generated texture id:%d", data->result);
}
/* find the difference between the start of the plane and where the video
* data starts in the plane */
static gsize
_find_plane_frame_start (GstGLMemory * gl_mem)
{
gsize plane_start;
gint i;
/* find the start of the plane data including padding */
plane_start = 0;
for (i = 0; i < gl_mem->plane; i++) {
plane_start +=
gst_gl_get_plane_data_size (&gl_mem->info, &gl_mem->valign, i);
}
/* offset between the plane data start and where the video frame starts */
return (GST_VIDEO_INFO_PLANE_OFFSET (&gl_mem->info,
gl_mem->plane)) - plane_start + gl_mem->mem.offset;
}
static void
_upload_memory (GstGLContext * context, GstGLMemory * gl_mem)
{
const GstGLFuncs *gl;
GLenum gl_format, gl_type, gl_target;
gpointer data;
gsize plane_start;
if (!GST_GL_MEMORY_FLAG_IS_SET (gl_mem, GST_GL_MEMORY_FLAG_NEED_UPLOAD)) {
return;
}
gl = context->gl_vtable;
gl_type = GL_UNSIGNED_BYTE;
if (gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_RGB16)
gl_type = GL_UNSIGNED_SHORT_5_6_5;
gl_format = _gst_gl_format_from_gl_texture_type (gl_mem->tex_type);
gl_target = gl_mem->tex_target;
if (USING_OPENGL (context) || USING_GLES3 (context)
|| USING_OPENGL3 (context)) {
gl->PixelStorei (GL_UNPACK_ROW_LENGTH, gl_mem->unpack_length);
} else if (USING_GLES2 (context)) {
gl->PixelStorei (GL_UNPACK_ALIGNMENT, gl_mem->unpack_length);
}
GST_LOG ("upload for texture id:%u, with pbo %u %ux%u",
gl_mem->tex_id, gl_mem->transfer_pbo, gl_mem->tex_width,
GL_MEM_HEIGHT (gl_mem));
/* find the start of the plane data including padding */
plane_start = _find_plane_frame_start (gl_mem);
if (gl_mem->transfer_pbo && CONTEXT_SUPPORTS_PBO_UPLOAD (context)) {
gl->BindBuffer (GL_PIXEL_UNPACK_BUFFER, gl_mem->transfer_pbo);
data = (void *) plane_start;
} else {
data = (gpointer) ((gintptr) plane_start + (gintptr) gl_mem->data);
}
gl->BindTexture (gl_target, gl_mem->tex_id);
gl->TexSubImage2D (gl_target, 0, 0, 0, gl_mem->tex_width,
GL_MEM_HEIGHT (gl_mem), gl_format, gl_type, data);
if (gl_mem->transfer_pbo && CONTEXT_SUPPORTS_PBO_UPLOAD (context))
gl->BindBuffer (GL_PIXEL_UNPACK_BUFFER, 0);
/* Reset to default values */
if (USING_OPENGL (context) || USING_GLES3 (context)) {
gl->PixelStorei (GL_UNPACK_ROW_LENGTH, 0);
} else if (USING_GLES2 (context)) {
gl->PixelStorei (GL_UNPACK_ALIGNMENT, 4);
}
gl->BindTexture (gl_target, 0);
GST_GL_MEMORY_FLAG_UNSET (gl_mem, GST_GL_MEMORY_FLAG_NEED_UPLOAD);
}
static inline void
_calculate_unpack_length (GstGLMemory * gl_mem)
{
guint n_gl_bytes;
gl_mem->tex_scaling[0] = 1.0f;
gl_mem->tex_scaling[1] = 1.0f;
gl_mem->unpack_length = 1;
gl_mem->tex_width = GL_MEM_WIDTH (gl_mem);
n_gl_bytes = _gl_texture_type_n_bytes (gl_mem->tex_type);
if (n_gl_bytes == 0) {
GST_ERROR ("Unsupported texture type %d", gl_mem->tex_type);
return;
}
if (USING_OPENGL (gl_mem->context) || USING_GLES3 (gl_mem->context)
|| USING_OPENGL3 (gl_mem->context)) {
gl_mem->unpack_length = GL_MEM_STRIDE (gl_mem) / n_gl_bytes;
} else if (USING_GLES2 (gl_mem->context)) {
guint j = 8;
while (j >= n_gl_bytes) {
/* GST_ROUND_UP_j(GL_MEM_WIDTH (gl_mem) * n_gl_bytes) */
guint round_up_j =
((GL_MEM_WIDTH (gl_mem) * n_gl_bytes) + j - 1) & ~(j - 1);
if (round_up_j == GL_MEM_STRIDE (gl_mem)) {
GST_LOG ("Found alignment of %u based on width "
"(with plane width:%u, plane stride:%u and pixel stride:%u. "
"RU%u(%u*%u) = %u)", j, GL_MEM_WIDTH (gl_mem),
GL_MEM_STRIDE (gl_mem), n_gl_bytes, j, GL_MEM_WIDTH (gl_mem),
n_gl_bytes, round_up_j);
gl_mem->unpack_length = j;
break;
}
j >>= 1;
}
if (j < n_gl_bytes) {
/* Failed to find a suitable alignment, try based on plane_stride and
* scale in the shader. Useful for alignments that are greater than 8.
*/
j = 8;
while (j >= n_gl_bytes) {
/* GST_ROUND_UP_j((GL_MEM_STRIDE (gl_mem)) */
guint round_up_j = ((GL_MEM_STRIDE (gl_mem)) + j - 1) & ~(j - 1);
if (round_up_j == (GL_MEM_STRIDE (gl_mem))) {
GST_LOG ("Found alignment of %u based on "
"stride (with plane stride:%u and pixel stride:%u. "
"RU%u(%u) = %u)", j, GL_MEM_STRIDE (gl_mem), n_gl_bytes, j,
GL_MEM_STRIDE (gl_mem), round_up_j);
gl_mem->unpack_length = j;
gl_mem->tex_scaling[0] =
(gfloat) (GL_MEM_WIDTH (gl_mem) * n_gl_bytes) /
(gfloat) GL_MEM_STRIDE (gl_mem);
gl_mem->tex_width = GL_MEM_STRIDE (gl_mem) / n_gl_bytes;
break;
}
j >>= 1;
}
if (j < n_gl_bytes) {
GST_ERROR
("Failed to find matching alignment. Image may "
"look corrupted. plane width:%u, plane stride:%u and pixel "
"stride:%u", GL_MEM_WIDTH (gl_mem), GL_MEM_STRIDE (gl_mem),
n_gl_bytes);
}
}
}
}
static void
_transfer_download (GstGLContext * context, GstGLMemory * gl_mem)
{
const GstGLFuncs *gl;
gsize plane_start;
gsize size;
guint format, type;
guint fboId;
if (!CONTEXT_SUPPORTS_PBO_DOWNLOAD (context)
|| gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE
|| gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE_ALPHA)
/* not supported */
return;
gl = context->gl_vtable;
if (!gl_mem->transfer_pbo)
gl->GenBuffers (1, &gl_mem->transfer_pbo);
GST_DEBUG ("downloading texture %u using pbo %u",
gl_mem->tex_id, gl_mem->transfer_pbo);
size = gst_gl_get_plane_data_size (&gl_mem->info, &gl_mem->valign,
gl_mem->plane);
plane_start = _find_plane_frame_start (gl_mem);
format = _gst_gl_format_from_gl_texture_type (gl_mem->tex_type);
type = GL_UNSIGNED_BYTE;
if (gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_RGB16)
type = GL_UNSIGNED_SHORT_5_6_5;
gl->BindBuffer (GL_PIXEL_PACK_BUFFER, gl_mem->transfer_pbo);
gl->BufferData (GL_PIXEL_PACK_BUFFER, size, NULL, GL_STREAM_READ);
/* FIXME: try and avoid creating and destroying fbo's every download... */
/* create a framebuffer object */
gl->GenFramebuffers (1, &fboId);
gl->BindFramebuffer (GL_FRAMEBUFFER, fboId);
gl->FramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, gl_mem->tex_id, 0);
if (!gst_gl_context_check_framebuffer_status (context)) {
GST_ERROR ("failed to download texture");
goto fbo_error;
}
gl->ReadPixels (0, 0, gl_mem->tex_width, GL_MEM_HEIGHT (gl_mem), format,
type, (void *) plane_start);
fbo_error:
gl->BindFramebuffer (GL_FRAMEBUFFER, 0);
gl->DeleteFramebuffers (1, &fboId);
gl->BindBuffer (GL_PIXEL_PACK_BUFFER, 0);
}
static void
_download_memory (GstGLContext * context, GstGLMemory * gl_mem)
{
const GstGLFuncs *gl;
guint format, type;
GLuint fboId;
gl = context->gl_vtable;
format = _gst_gl_format_from_gl_texture_type (gl_mem->tex_type);
type = GL_UNSIGNED_BYTE;
if (gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_RGB16)
type = GL_UNSIGNED_SHORT_5_6_5;
if (!gl->GenFramebuffers) {
gst_gl_context_set_error (context, "Cannot download GL texture "
"without support for Framebuffers");
goto error;
}
if (gst_gl_context_get_gl_api (context) & GST_GL_API_GLES2
&& (gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE
|| gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE_ALPHA)) {
gst_gl_context_set_error (context, "Cannot download GL luminance/"
"luminance alpha textures");
goto error;
}
GST_LOG ("downloading memory %p, tex %u into %p",
gl_mem, gl_mem->tex_id, gl_mem->data);
if (gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE
|| gl_mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_LUMINANCE_ALPHA) {
gl->BindTexture (gl_mem->tex_target, gl_mem->tex_id);
gl->GetTexImage (gl_mem->tex_target, 0, format, type, gl_mem->data);
gl->BindTexture (gl_mem->tex_target, 0);
} else if (gl_mem->transfer_pbo && CONTEXT_SUPPORTS_PBO_DOWNLOAD (context)) {
gsize size, plane_start;
gpointer map_data = NULL;
size = gst_gl_get_plane_data_size (&gl_mem->info, &gl_mem->valign,
gl_mem->plane);
gl->BindBuffer (GL_PIXEL_PACK_BUFFER, gl_mem->transfer_pbo);
map_data =
gl->MapBufferRange (GL_PIXEL_PACK_BUFFER, 0, size, GL_MAP_READ_BIT);
if (!map_data) {
GST_WARNING ("error mapping buffer for download");
gl->BindBuffer (GL_PIXEL_PACK_BUFFER, 0);
goto read_pixels;
}
/* FIXME: COPY! use glMapBuffer + glSync everywhere to remove this */
plane_start = _find_plane_frame_start (gl_mem);
memcpy ((guint8 *) gl_mem->data + plane_start, map_data, size);
gl->UnmapBuffer (GL_PIXEL_PACK_BUFFER);
gl->BindBuffer (GL_PIXEL_PACK_BUFFER, 0);
} else {
read_pixels:
/* FIXME: try and avoid creating and destroying fbo's every download... */
/* create a framebuffer object */
gl->GenFramebuffers (1, &fboId);
gl->BindFramebuffer (GL_FRAMEBUFFER, fboId);
gl->FramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
gl_mem->tex_target, gl_mem->tex_id, 0);
if (!gst_gl_context_check_framebuffer_status (context))
goto fbo_error;
gl->ReadPixels (0, 0, gl_mem->tex_width, GL_MEM_HEIGHT (gl_mem), format,
type, gl_mem->data);
gl->BindFramebuffer (GL_FRAMEBUFFER, 0);
fbo_error:
gl->DeleteFramebuffers (1, &fboId);
}
error:
return;
}
static void
_gl_mem_init (GstGLMemory * mem, GstAllocator * allocator, GstMemory * parent,
GstGLContext * context, GstAllocationParams * params, GstVideoInfo * info,
GstVideoAlignment * valign, guint plane, gpointer user_data,
GDestroyNotify notify)
{
gsize size, maxsize;
gsize align = gst_memory_alignment, offset = 0;
g_return_if_fail (plane < GST_VIDEO_INFO_N_PLANES (info));
mem->info = *info;
if (valign)
mem->valign = *valign;
else
gst_video_alignment_reset (&mem->valign);
size = maxsize = gst_gl_get_plane_data_size (info, valign, plane);
if (params) {
align |= params->align;
offset = params->prefix;
maxsize += params->prefix + params->padding + align;
}
gst_memory_init (GST_MEMORY_CAST (mem), 0, allocator, parent, maxsize, align,
offset, size);
mem->context = gst_object_ref (context);
mem->tex_type =
gst_gl_texture_type_from_format (context, GST_VIDEO_INFO_FORMAT (info),
plane);
/* we always operate on 2D textures unless we're dealing with wrapped textures */
mem->tex_target = GL_TEXTURE_2D;
mem->plane = plane;
mem->notify = notify;
mem->user_data = user_data;
mem->texture_wrapped = FALSE;
g_mutex_init (&mem->lock);
_calculate_unpack_length (mem);
GST_DEBUG ("new GL texture context:%" GST_PTR_FORMAT " memory:%p format:%u "
"dimensions:%ux%u stride:%u size:%" G_GSIZE_FORMAT, context, mem,
mem->tex_type, mem->tex_width, GL_MEM_HEIGHT (mem), GL_MEM_STRIDE (mem),
maxsize);
}
static GstGLMemory *
_gl_mem_new (GstAllocator * allocator, GstMemory * parent,
GstGLContext * context, GstAllocationParams * params, GstVideoInfo * info,
GstVideoAlignment * valign, guint plane, gpointer user_data,
GDestroyNotify notify)
{
GstGLMemory *mem;
GenTexture data = { 0, };
mem = g_slice_new0 (GstGLMemory);
_gl_mem_init (mem, allocator, parent, context, params, info, valign, plane,
user_data, notify);
data.width = mem->tex_width;
data.height = GL_MEM_HEIGHT (mem);
data.gl_format = _gst_gl_format_from_gl_texture_type (mem->tex_type);
data.gl_type = GL_UNSIGNED_BYTE;
data.gl_target = mem->tex_target;
if (mem->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_RGB16)
data.gl_type = GL_UNSIGNED_SHORT_5_6_5;
gst_gl_context_thread_add (context,
(GstGLContextThreadFunc) _generate_texture, &data);
if (!data.result) {
GST_WARNING ("Could not create GL texture with context:%" GST_PTR_FORMAT,
context);
}
GST_TRACE ("created texture %u", data.result);
mem->tex_id = data.result;
mem->tex_target = data.gl_target;
return mem;
}
static GstGLMemory *
_gl_mem_alloc_data (GstGLMemory * mem)
{
guint8 *data;
gsize align, aoffset;
data = g_try_malloc (mem->mem.maxsize);
mem->alloc_data = mem->data = data;
if (data == NULL) {
gst_memory_unref ((GstMemory *) mem);
return NULL;
}
/* do alignment */
align = mem->mem.align;
if ((aoffset = ((guintptr) data & align))) {
aoffset = (align + 1) - aoffset;
data += aoffset;
mem->mem.maxsize -= aoffset;
mem->data = data;
}
return mem;
}
static gpointer
_gl_mem_map (GstGLMemory * gl_mem, gsize maxsize, GstMapFlags flags)
{
gpointer data;
g_return_val_if_fail (maxsize == gl_mem->mem.maxsize, NULL);
g_mutex_lock (&gl_mem->lock);
if ((flags & GST_MAP_GL) == GST_MAP_GL) {
if ((flags & GST_MAP_READ) == GST_MAP_READ) {
GST_TRACE ("mapping GL texture:%u for reading", gl_mem->tex_id);
if (GST_GL_MEMORY_FLAG_IS_SET (gl_mem, GST_GL_MEMORY_FLAG_NEED_UPLOAD)) {
gst_gl_context_thread_add (gl_mem->context,
(GstGLContextThreadFunc) _upload_memory, gl_mem);
GST_GL_MEMORY_FLAG_UNSET (gl_mem, GST_GL_MEMORY_FLAG_NEED_UPLOAD);
}
}
if ((flags & GST_MAP_WRITE) == GST_MAP_WRITE) {
GST_TRACE ("mapping GL texture:%u for writing", gl_mem->tex_id);
GST_GL_MEMORY_FLAG_SET (gl_mem, GST_GL_MEMORY_FLAG_NEED_DOWNLOAD);
GST_GL_MEMORY_FLAG_UNSET (gl_mem, GST_GL_MEMORY_FLAG_NEED_UPLOAD);
}
data = &gl_mem->tex_id;
} else { /* not GL */
if ((flags & GST_MAP_READ) == GST_MAP_READ) {
GST_TRACE ("mapping GL texture:%u for reading from system memory",
gl_mem->tex_id);
if (GST_GL_MEMORY_FLAG_IS_SET (gl_mem, GST_GL_MEMORY_FLAG_NEED_DOWNLOAD)) {
gst_gl_context_thread_add (gl_mem->context,
(GstGLContextThreadFunc) _download_memory, gl_mem);
GST_GL_MEMORY_FLAG_UNSET (gl_mem, GST_GL_MEMORY_FLAG_NEED_DOWNLOAD);
}
}
if ((flags & GST_MAP_WRITE) == GST_MAP_WRITE) {
GST_TRACE ("mapping GL texture:%u for writing to system memory",
gl_mem->tex_id);
GST_GL_MEMORY_FLAG_SET (gl_mem, GST_GL_MEMORY_FLAG_NEED_UPLOAD);
GST_GL_MEMORY_FLAG_UNSET (gl_mem, GST_GL_MEMORY_FLAG_NEED_DOWNLOAD);
}
data = gl_mem->data;
}
/* only store the first map flags, subsequent maps must be a subset of this */
if (gl_mem->map_count++ == 0)
gl_mem->map_flags = flags;
g_mutex_unlock (&gl_mem->lock);
return data;
}
void
gst_gl_memory_download_transfer (GstGLMemory * gl_mem)
{
g_mutex_lock (&gl_mem->lock);
gst_gl_context_thread_add (gl_mem->context,
(GstGLContextThreadFunc) _transfer_download, gl_mem);
g_mutex_unlock (&gl_mem->lock);
}
static void
_gl_mem_unmap (GstGLMemory * gl_mem)
{
g_mutex_lock (&gl_mem->lock);
if (--gl_mem->map_count <= 0)
gl_mem->map_flags = 0;
g_mutex_unlock (&gl_mem->lock);
}
static void
_gl_mem_copy_thread (GstGLContext * context, gpointer data)
{
const GstGLFuncs *gl;
GstGLMemoryCopyParams *copy_params;
GstGLMemory *src;
guint tex_id;
GLuint 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 = (GstGLMemoryCopyParams *) data;
src = copy_params->src;
tex_id = copy_params->tex_id;
out_tex_target = copy_params->tex_target;
out_width = copy_params->out_width;
out_height = copy_params->out_height;
out_stride = copy_params->out_stride;
gl = src->context->gl_vtable;
out_gl_format = _gst_gl_format_from_gl_texture_type (copy_params->out_format);
out_gl_type = GL_UNSIGNED_BYTE;
if (copy_params->out_format == GST_VIDEO_GL_TEXTURE_TYPE_RGB16)
out_gl_type = GL_UNSIGNED_SHORT_5_6_5;
in_gl_format = _gst_gl_format_from_gl_texture_type (src->tex_type);
in_gl_type = GL_UNSIGNED_BYTE;
if (src->tex_type == GST_VIDEO_GL_TEXTURE_TYPE_RGB16)
in_gl_type = GL_UNSIGNED_SHORT_5_6_5;
if (!gl->GenFramebuffers) {
gst_gl_context_set_error (src->context,
"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_ERROR ("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) {
GenTexture data = { 0, };
data.width = copy_params->out_width;
data.height = copy_params->out_height;
data.gl_target = out_tex_target;
data.gl_format = out_gl_format;
data.gl_type = GL_UNSIGNED_BYTE;
if (copy_params->out_format == GST_VIDEO_GL_TEXTURE_TYPE_RGB16)
data.gl_type = GL_UNSIGNED_SHORT_5_6_5;
_generate_texture (context, &data);
tex_id = data.result;
}
if (!tex_id) {
GST_WARNING ("Could not create GL texture with context:%p", src->context);
}
GST_LOG ("copying memory %p, tex %u into texture %i",
src, src->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,
src->tex_target, src->tex_id, 0);
// if (!gst_gl_context_check_framebuffer_status (src->context))
// goto fbo_error;
gl->BindTexture (out_tex_target, tex_id);
if (copy_params->respecify) {
if (!gl->GenBuffers) {
gst_gl_context_set_error (context, "Cannot reinterpret texture contents "
"without 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_gl_context_set_error (context, "Cannot copy non RGBA/UNSIGNED_BYTE "
"textures on GLES2");
gl->BindTexture (out_tex_target, 0);
goto fbo_error;
}
if (!src->pbo)
gl->GenBuffers (1, &src->pbo);
GST_TRACE ("copying texture data with size of %u*%u*%u",
_gl_format_type_n_bytes (in_gl_format, in_gl_type), src->tex_width,
GL_MEM_HEIGHT (src));
/* copy tex */
gl->BindBuffer (GL_PIXEL_PACK_BUFFER, src->pbo);
gl->BufferData (GL_PIXEL_PACK_BUFFER, in_size, NULL, GL_STREAM_COPY);
gl->ReadPixels (0, 0, src->tex_width, GL_MEM_HEIGHT (src), in_gl_format,
in_gl_type, 0);
gl->BindBuffer (GL_PIXEL_PACK_BUFFER, 0);
gl->BindBuffer (GL_PIXEL_UNPACK_BUFFER, src->pbo);
gl->TexSubImage2D (out_tex_target, 0, 0, 0, out_width, out_height,
out_gl_format, out_gl_type, 0);
gl->BindBuffer (GL_PIXEL_UNPACK_BUFFER, 0);
} else { /* different sizes */
gl->CopyTexImage2D (out_tex_target, 0, out_gl_format, 0, 0, out_width,
out_height, 0);
}
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 (GstGLMemory * src, gssize offset, gssize size)
{
GstGLAllocator *allocator = (GstGLAllocator *) src->mem.allocator;
GstMemory *ret = NULL;
g_mutex_lock (&((GstGLMemory *) src)->lock);
/* If not doing a full copy, then copy to sysmem, the 2D represention of the
* texture would become wrong */
if (offset > 0 || size < src->mem.size) {
ret = allocator->fallback_mem_copy (&src->mem, offset, size);
} else if (GST_GL_MEMORY_FLAG_IS_SET (src, GST_GL_MEMORY_FLAG_NEED_UPLOAD)) {
GstAllocationParams params = { 0, src->mem.align, 0, 0 };
GstGLMemory *dest;
dest = _gl_mem_new (src->mem.allocator, NULL, src->context, &params,
&src->info, &src->valign, src->plane, NULL, NULL);
dest = _gl_mem_alloc_data (dest);
if (dest == NULL) {
GST_WARNING ("Could not copy GL Memory");
gst_memory_unref ((GstMemory *) dest);
goto done;
}
memcpy (dest->data, (guint8 *) src->data + src->mem.offset, src->mem.size);
GST_GL_MEMORY_FLAG_SET (dest, GST_GL_MEMORY_FLAG_NEED_UPLOAD);
ret = (GstMemory *) dest;
} else {
GstAllocationParams params = { 0, src->mem.align, 0, 0 };
GstGLMemoryCopyParams copy_params;
GstGLMemory *dest;
copy_params.src = src;
copy_params.tex_id = 0;
copy_params.out_format = src->tex_type;
copy_params.tex_target = src->tex_target;
copy_params.out_width = src->tex_width;
copy_params.out_height = GL_MEM_HEIGHT (src);
copy_params.out_stride = GL_MEM_STRIDE (src);
copy_params.respecify = FALSE;
gst_gl_context_thread_add (src->context, _gl_mem_copy_thread, &copy_params);
if (!copy_params.result) {
GST_WARNING ("Could not copy GL Memory");
goto done;
}
dest = g_slice_new0 (GstGLMemory);
_gl_mem_init (dest, src->mem.allocator, NULL, src->context, &params,
&src->info, &src->valign, src->plane, NULL, NULL);
dest->tex_id = copy_params.tex_id;
dest->tex_target = copy_params.tex_target;
dest = _gl_mem_alloc_data (dest);
GST_GL_MEMORY_FLAG_SET (dest, GST_GL_MEMORY_FLAG_NEED_DOWNLOAD);
ret = (GstMemory *) dest;
}
done:
g_mutex_unlock (&((GstGLMemory *) src)->lock);
return ret;
}
static GstMemory *
_gl_mem_share (GstGLMemory * mem, gssize offset, gssize size)
{
return NULL;
}
static gboolean
_gl_mem_is_span (GstGLMemory * mem1, GstGLMemory * mem2, gsize * offset)
{
return FALSE;
}
static GstMemory *
_gl_mem_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params)
{
g_warning ("use gst_gl_memory_alloc () to allocate from this "
"GstGLMemory allocator");
return NULL;
}
static void
_destroy_gl_objects (GstGLContext * context, GstGLMemory * gl_mem)
{
const GstGLFuncs *gl = context->gl_vtable;
if (gl_mem->tex_id && !gl_mem->texture_wrapped)
gl->DeleteTextures (1, &gl_mem->tex_id);
if (gl_mem->pbo)
gl->DeleteBuffers (1, &gl_mem->pbo);
if (gl_mem->transfer_pbo)
gl->DeleteBuffers (1, &gl_mem->transfer_pbo);
}
static void
_gl_mem_free (GstAllocator * allocator, GstMemory * mem)
{
GstGLMemory *gl_mem = (GstGLMemory *) mem;
GST_TRACE ("freeing texture %u", gl_mem->tex_id);
gst_gl_context_thread_add (gl_mem->context,
(GstGLContextThreadFunc) _destroy_gl_objects, gl_mem);
if (gl_mem->notify)
gl_mem->notify (gl_mem->user_data);
if (gl_mem->alloc_data) {
g_free (gl_mem->alloc_data);
gl_mem->alloc_data = NULL;
gl_mem->data = NULL;
}
g_mutex_clear (&gl_mem->lock);
gst_object_unref (gl_mem->context);
g_slice_free (GstGLMemory, gl_mem);
}
/**
* gst_gl_memory_copy_into_texture:
* @gl_mem:a #GstGLMemory
* @tex_id:OpenGL texture id
* @tex_type: a #GstVideoGLTextureType
* @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_type, @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
*/
gboolean
gst_gl_memory_copy_into_texture (GstGLMemory * gl_mem, guint tex_id,
GstVideoGLTextureType tex_type, gint width, gint height, gint stride,
gboolean respecify)
{
GstGLMemoryCopyParams copy_params;
copy_params.src = gl_mem;
copy_params.tex_target = gl_mem->tex_target;
copy_params.tex_id = tex_id;
copy_params.out_format = tex_type;
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->context, _gl_mem_copy_thread,
&copy_params);
return copy_params.result;
}
/**
* gst_gl_memory_wrapped_texture:
* @context: a #GstGLContext
* @texture_id: the GL texture handle
* @texture_target: the GL texture target
* @info: the #GstVideoInfo of the memory
* @plane: The plane this memory will represent
* @user_data: user data
* @notify: Destroy callback for the user data
*
* Wraps a texture handle into a #GstGLMemory.
*
* Returns: a newly allocated #GstGLMemory
*/
GstGLMemory *
gst_gl_memory_wrapped_texture (GstGLContext * context,
guint texture_id, guint texture_target,
GstVideoInfo * info, guint plane, GstVideoAlignment * valign,
gpointer user_data, GDestroyNotify notify)
{
GstGLMemory *mem;
mem = g_slice_new0 (GstGLMemory);
_gl_mem_init (mem, _gl_allocator, NULL, context, NULL, info, valign, plane,
user_data, notify);
mem->tex_id = texture_id;
mem->tex_target = texture_target;
mem->texture_wrapped = TRUE;
mem = _gl_mem_alloc_data (mem);
GST_GL_MEMORY_FLAG_SET (mem, GST_GL_MEMORY_FLAG_NEED_DOWNLOAD);
return mem;
}
/**
* gst_gl_memory_alloc:
* @context:a #GstGLContext
* @params: a #GstAllocationParams
* @info: the #GstVideoInfo of the memory
* @plane: the plane this memory will represent
* @valign: the #GstVideoAlignment applied to @info
*
* Allocated a new #GstGlMemory.
*
* Returns: a #GstMemory object with a GL texture specified by @vinfo
* from @context
*/
GstMemory *
gst_gl_memory_alloc (GstGLContext * context, GstAllocationParams * params,
GstVideoInfo * info, guint plane, GstVideoAlignment * valign)
{
GstGLMemory *mem;
mem = _gl_mem_new (_gl_allocator, NULL, context, params, info, valign, plane,
NULL, NULL);
mem = _gl_mem_alloc_data (mem);
return (GstMemory *) mem;
}
/**
* gst_gl_memory_wrapped:
* @context:a #GstGLContext
* @info: the #GstVideoInfo of the memory and data
* @plane: the plane this memory will represent
* @valign: the #GstVideoAlignment applied to @info
* @data: the data to wrap
* @user_data: data called with for @notify
* @notify: function called with @user_data when @data needs to be freed
*
* Wrapped @data into a #GstGLMemory. This version will account for padding
* added to the allocation and expressed through @valign.
*
* Returns: a #GstGLMemory object with a GL texture specified by @v_info
* from @context and contents specified by @data
*/
GstGLMemory *
gst_gl_memory_wrapped (GstGLContext * context, GstVideoInfo * info,
guint plane, GstVideoAlignment * valign, gpointer data, gpointer user_data,
GDestroyNotify notify)
{
GstGLMemory *mem;
mem = _gl_mem_new (_gl_allocator, NULL, context, NULL, info, valign, plane,
user_data, notify);
mem->data = data;
GST_GL_MEMORY_FLAG_SET (mem, GST_GL_MEMORY_FLAG_NEED_UPLOAD);
return mem;
}
gint
gst_gl_memory_get_texture_width (GstGLMemory * gl_mem)
{
g_return_val_if_fail (gst_is_gl_memory ((GstMemory *) gl_mem), 0);
return gl_mem->tex_width;
}
gint
gst_gl_memory_get_texture_height (GstGLMemory * gl_mem)
{
g_return_val_if_fail (gst_is_gl_memory ((GstMemory *) gl_mem), 0);
return _get_plane_height (&gl_mem->info, gl_mem->plane);
}
G_DEFINE_TYPE (GstGLAllocator, gst_gl_allocator, GST_TYPE_ALLOCATOR);
static void
gst_gl_allocator_class_init (GstGLAllocatorClass * klass)
{
GstAllocatorClass *allocator_class;
allocator_class = (GstAllocatorClass *) klass;
allocator_class->alloc = _gl_mem_alloc;
allocator_class->free = _gl_mem_free;
}
static void
gst_gl_allocator_init (GstGLAllocator * allocator)
{
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
/* Keep the fallback copy function around, we will need it when copying with
* at an offset or smaller size */
allocator->fallback_mem_copy = alloc->mem_copy;
alloc->mem_type = GST_GL_MEMORY_ALLOCATOR;
alloc->mem_map = (GstMemoryMapFunction) _gl_mem_map;
alloc->mem_unmap = (GstMemoryUnmapFunction) _gl_mem_unmap;
alloc->mem_copy = (GstMemoryCopyFunction) _gl_mem_copy;
alloc->mem_share = (GstMemoryShareFunction) _gl_mem_share;
alloc->mem_is_span = (GstMemoryIsSpanFunction) _gl_mem_is_span;
GST_OBJECT_FLAG_SET (allocator, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
}
/**
* gst_gl_memory_init:
*
* Initializes the GL Memory allocator. It is safe to call this function
* multiple times. This must be called before any other GstGLMemory operation.
*/
void
gst_gl_memory_init (void)
{
static volatile gsize _init = 0;
if (g_once_init_enter (&_init)) {
GST_DEBUG_CATEGORY_INIT (GST_CAT_GL_MEMORY, "glmemory", 0, "OpenGL Memory");
_gl_allocator = g_object_new (gst_gl_allocator_get_type (), NULL);
gst_allocator_register (GST_GL_MEMORY_ALLOCATOR,
gst_object_ref (_gl_allocator));
g_once_init_leave (&_init, 1);
}
}
/**
* gst_is_gl_memory:
* @mem:a #GstMemory
*
* Returns: whether the memory at @mem is a #GstGLMemory
*/
gboolean
gst_is_gl_memory (GstMemory * mem)
{
return mem != NULL && mem->allocator == _gl_allocator;
}
/**
* gst_gl_memory_setup_buffer:
* @context: a #GstGLContext
* @params: a #GstAllocationParams
* @info: a #GstVideoInfo
* @valign: the #GstVideoAlignment applied to @info
* @buffer: a #GstBuffer
*
* Adds the required #GstGLMemory<!-- -->s with the correct configuration to
* @buffer based on @info. This version handles padding through @valign.
*
* Returns: whether the memory's were sucessfully added.
*/
gboolean
gst_gl_memory_setup_buffer (GstGLContext * context,
GstAllocationParams * params, GstVideoInfo * info,
GstVideoAlignment * valign, GstBuffer * buffer)
{
GstGLMemory *gl_mem[GST_VIDEO_MAX_PLANES] = { NULL, };
guint n_mem, i;
n_mem = GST_VIDEO_INFO_N_PLANES (info);
for (i = 0; i < n_mem; i++) {
gl_mem[i] =
(GstGLMemory *) gst_gl_memory_alloc (context, params, info, i, valign);
if (gl_mem[i] == NULL)
return FALSE;
gst_buffer_append_memory (buffer, (GstMemory *) gl_mem[i]);
}
gst_buffer_add_video_meta_full (buffer, 0,
GST_VIDEO_INFO_FORMAT (info), GST_VIDEO_INFO_WIDTH (info),
GST_VIDEO_INFO_HEIGHT (info), n_mem, info->offset, info->stride);
return TRUE;
}
/**
* gst_gl_memory_setup_wrapped:
* @context: a #GstGLContext
* @info: a #GstVideoInfo
* @valign: a #GstVideoInfo
* @data: a list of per plane data pointers
* @textures: (transfer out): a list of #GstGLMemory
*
* Wraps per plane data pointer in @data into the corresponding entry in
* @textures based on @info and padding from @valign.
*
* Returns: whether the memory's were sucessfully created.
*/
gboolean
gst_gl_memory_setup_wrapped (GstGLContext * context, GstVideoInfo * info,
GstVideoAlignment * valign, gpointer data[GST_VIDEO_MAX_PLANES],
GstGLMemory * textures[GST_VIDEO_MAX_PLANES])
{
gint i;
for (i = 0; i < GST_VIDEO_INFO_N_PLANES (info); i++) {
textures[i] = (GstGLMemory *) gst_gl_memory_wrapped (context, info, i,
valign, data[i], NULL, NULL);
}
return TRUE;
}
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