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gstreamer/sys/applemedia/vtdec.c
Matthew Waters dc6c4ea5c2 vtdec: destroy and create the GL context on start()/stop() 
Removes a reference count loop
2017-10-30 17:19:40 +11:00

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/* GStreamer
* Copyright (C) 2010, 2013 Ole André Vadla Ravnås <oleavr@soundrop.com>
* Copyright (C) 2012-2016 Alessandro Decina <alessandro.d@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 Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-vtdec
* @title: gstvtdec
*
* Apple VideoToolbox based decoder.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v filesrc location=file.mov ! qtdemux ! queue ! h264parse ! vtdec ! videoconvert ! autovideosink
* ]|
* Decode h264 video from a mov file.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/gstvideodecoder.h>
#include <gst/gl/gstglcontext.h>
#include "vtdec.h"
#include "vtutil.h"
#include "corevideobuffer.h"
#include "coremediabuffer.h"
GST_DEBUG_CATEGORY_STATIC (gst_vtdec_debug_category);
#define GST_CAT_DEFAULT gst_vtdec_debug_category
enum
{
/* leave some headroom for new GstVideoCodecFrameFlags flags */
VTDEC_FRAME_FLAG_SKIP = (1 << 10),
VTDEC_FRAME_FLAG_DROP = (1 << 11),
};
static void gst_vtdec_finalize (GObject * object);
static gboolean gst_vtdec_start (GstVideoDecoder * decoder);
static gboolean gst_vtdec_stop (GstVideoDecoder * decoder);
static gboolean gst_vtdec_negotiate (GstVideoDecoder * decoder);
static gboolean gst_vtdec_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state);
static gboolean gst_vtdec_flush (GstVideoDecoder * decoder);
static GstFlowReturn gst_vtdec_finish (GstVideoDecoder * decoder);
static GstFlowReturn gst_vtdec_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame);
static OSStatus gst_vtdec_create_session (GstVtdec * vtdec,
GstVideoFormat format, gboolean enable_hardware);
static void gst_vtdec_invalidate_session (GstVtdec * vtdec);
static CMSampleBufferRef cm_sample_buffer_from_gst_buffer (GstVtdec * vtdec,
GstBuffer * buf);
static GstFlowReturn gst_vtdec_push_frames_if_needed (GstVtdec * vtdec,
gboolean drain, gboolean flush);
static CMFormatDescriptionRef create_format_description (GstVtdec * vtdec,
CMVideoCodecType cm_format);
static CMFormatDescriptionRef
create_format_description_from_codec_data (GstVtdec * vtdec,
CMVideoCodecType cm_format, GstBuffer * codec_data);
static void gst_vtdec_session_output_callback (void
*decompression_output_ref_con, void *source_frame_ref_con, OSStatus status,
VTDecodeInfoFlags info_flags, CVImageBufferRef image_buffer, CMTime pts,
CMTime duration);
static gboolean compute_h264_decode_picture_buffer_length (GstVtdec * vtdec,
GstBuffer * codec_data, int *length);
static gboolean gst_vtdec_compute_reorder_queue_length (GstVtdec * vtdec,
CMVideoCodecType cm_format, GstBuffer * codec_data);
static void gst_vtdec_set_latency (GstVtdec * vtdec);
static void gst_vtdec_set_context (GstElement * element, GstContext * context);
static GstStaticPadTemplate gst_vtdec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264, stream-format=avc, alignment=au,"
" width=(int)[1, MAX], height=(int)[1, MAX];"
"video/mpeg, mpegversion=2, systemstream=false, parsed=true;"
"image/jpeg")
);
/* define EnableHardwareAcceleratedVideoDecoder in < 10.9 */
#if defined(MAC_OS_X_VERSION_MAX_ALLOWED) && MAC_OS_X_VERSION_MAX_ALLOWED < 1090
const CFStringRef
kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder =
CFSTR ("EnableHardwareAcceleratedVideoDecoder");
const CFStringRef
kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder =
CFSTR ("RequireHardwareAcceleratedVideoDecoder");
#endif
#define VIDEO_SRC_CAPS \
GST_VIDEO_CAPS_MAKE("NV12") ";" \
GST_VIDEO_CAPS_MAKE_WITH_FEATURES(GST_CAPS_FEATURE_MEMORY_GL_MEMORY,\
"NV12") ", " \
"texture-target = (string) rectangle;"
G_DEFINE_TYPE (GstVtdec, gst_vtdec, GST_TYPE_VIDEO_DECODER);
static void
gst_vtdec_class_init (GstVtdecClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstVideoDecoderClass *video_decoder_class = GST_VIDEO_DECODER_CLASS (klass);
/* Setting up pads and setting metadata should be moved to
base_class_init if you intend to subclass this class. */
gst_element_class_add_static_pad_template (element_class,
&gst_vtdec_sink_template);
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_caps_from_string (VIDEO_SRC_CAPS)));
gst_element_class_set_static_metadata (element_class,
"Apple VideoToolbox decoder",
"Codec/Decoder/Video",
"Apple VideoToolbox Decoder",
"Ole André Vadla Ravnås <oleavr@soundrop.com>; "
"Alessandro Decina <alessandro.d@gmail.com>");
gobject_class->finalize = gst_vtdec_finalize;
element_class->set_context = gst_vtdec_set_context;
video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_vtdec_start);
video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_vtdec_stop);
video_decoder_class->negotiate = GST_DEBUG_FUNCPTR (gst_vtdec_negotiate);
video_decoder_class->set_format = GST_DEBUG_FUNCPTR (gst_vtdec_set_format);
video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_vtdec_flush);
video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_vtdec_finish);
video_decoder_class->handle_frame =
GST_DEBUG_FUNCPTR (gst_vtdec_handle_frame);
}
static void
gst_vtdec_init (GstVtdec * vtdec)
{
vtdec->reorder_queue = g_async_queue_new ();
}
void
gst_vtdec_finalize (GObject * object)
{
GstVtdec *vtdec = GST_VTDEC (object);
GST_DEBUG_OBJECT (vtdec, "finalize");
g_async_queue_unref (vtdec->reorder_queue);
G_OBJECT_CLASS (gst_vtdec_parent_class)->finalize (object);
}
static gboolean
gst_vtdec_start (GstVideoDecoder * decoder)
{
GstVtdec *vtdec = GST_VTDEC (decoder);
GST_DEBUG_OBJECT (vtdec, "start");
if (!vtdec->ctxh)
vtdec->ctxh = gst_gl_context_helper_new (GST_ELEMENT (decoder));
return TRUE;
}
static gboolean
gst_vtdec_stop (GstVideoDecoder * decoder)
{
GstVtdec *vtdec = GST_VTDEC (decoder);
gst_vtdec_push_frames_if_needed (vtdec, TRUE, TRUE);
if (vtdec->input_state)
gst_video_codec_state_unref (vtdec->input_state);
vtdec->input_state = NULL;
if (vtdec->session)
gst_vtdec_invalidate_session (vtdec);
if (vtdec->texture_cache)
gst_video_texture_cache_free (vtdec->texture_cache);
vtdec->texture_cache = NULL;
if (vtdec->ctxh)
gst_gl_context_helper_free (vtdec->ctxh);
vtdec->ctxh = NULL;
GST_DEBUG_OBJECT (vtdec, "stop");
return TRUE;
}
static void
setup_texture_cache (GstVtdec * vtdec, GstGLContext * context)
{
GstVideoCodecState *output_state;
g_return_if_fail (vtdec->texture_cache == NULL);
output_state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (vtdec));
vtdec->texture_cache = gst_video_texture_cache_new (context);
gst_video_texture_cache_set_format (vtdec->texture_cache,
GST_VIDEO_FORMAT_NV12, output_state->caps);
gst_video_codec_state_unref (output_state);
}
static gboolean
gst_vtdec_negotiate (GstVideoDecoder * decoder)
{
GstVideoCodecState *output_state = NULL;
GstCaps *peercaps = NULL, *caps = NULL, *templcaps = NULL, *prevcaps = NULL;
GstVideoFormat format;
GstStructure *structure;
const gchar *s;
GstVtdec *vtdec;
OSStatus err = noErr;
GstCapsFeatures *features = NULL;
gboolean output_textures;
vtdec = GST_VTDEC (decoder);
if (vtdec->session)
gst_vtdec_push_frames_if_needed (vtdec, TRUE, FALSE);
output_state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (vtdec));
if (output_state) {
prevcaps = gst_caps_ref (output_state->caps);
gst_video_codec_state_unref (output_state);
}
peercaps = gst_pad_peer_query_caps (GST_VIDEO_DECODER_SRC_PAD (vtdec), NULL);
if (prevcaps && gst_caps_can_intersect (prevcaps, peercaps)) {
/* The hardware decoder can become (temporarily) unavailable across
* VTDecompressionSessionCreate/Destroy calls. So if the currently configured
* caps are still accepted by downstream we keep them so we don't have to
* destroy and recreate the session.
*/
GST_INFO_OBJECT (vtdec,
"current and peer caps are compatible, keeping current caps");
caps = gst_caps_ref (prevcaps);
} else {
templcaps =
gst_pad_get_pad_template_caps (GST_VIDEO_DECODER_SRC_PAD (decoder));
caps =
gst_caps_intersect_full (peercaps, templcaps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (templcaps);
}
gst_caps_unref (peercaps);
caps = gst_caps_truncate (gst_caps_make_writable (caps));
structure = gst_caps_get_structure (caps, 0);
s = gst_structure_get_string (structure, "format");
format = gst_video_format_from_string (s);
features = gst_caps_get_features (caps, 0);
if (features)
features = gst_caps_features_copy (features);
output_state = gst_video_decoder_set_output_state (GST_VIDEO_DECODER (vtdec),
format, vtdec->video_info.width, vtdec->video_info.height,
vtdec->input_state);
output_state->caps = gst_video_info_to_caps (&output_state->info);
if (features) {
gst_caps_set_features (output_state->caps, 0, features);
output_textures =
gst_caps_features_contains (features,
GST_CAPS_FEATURE_MEMORY_GL_MEMORY);
if (output_textures)
gst_caps_set_simple (output_state->caps, "texture-target", G_TYPE_STRING,
#if !HAVE_IOS
GST_GL_TEXTURE_TARGET_RECTANGLE_STR,
#else
GST_GL_TEXTURE_TARGET_2D_STR,
#endif
NULL);
}
gst_caps_unref (caps);
if (!prevcaps || !gst_caps_is_equal (prevcaps, output_state->caps)) {
gboolean renegotiating = vtdec->session != NULL;
GST_INFO_OBJECT (vtdec,
"negotiated output format %" GST_PTR_FORMAT " previous %"
GST_PTR_FORMAT, output_state->caps, prevcaps);
if (vtdec->session)
gst_vtdec_invalidate_session (vtdec);
err = gst_vtdec_create_session (vtdec, format, TRUE);
if (err == noErr) {
GST_INFO_OBJECT (vtdec, "using hardware decoder");
} else if (err == kVTVideoDecoderNotAvailableNowErr && renegotiating) {
GST_WARNING_OBJECT (vtdec, "hw decoder not available anymore");
err = gst_vtdec_create_session (vtdec, format, FALSE);
}
if (err != noErr) {
GST_ELEMENT_ERROR (vtdec, RESOURCE, FAILED, (NULL),
("VTDecompressionSessionCreate returned %d", (int) err));
}
}
if (vtdec->texture_cache != NULL && !output_textures) {
gst_video_texture_cache_free (vtdec->texture_cache);
vtdec->texture_cache = NULL;
}
if (err == noErr && output_textures) {
/* call this regardless of whether caps have changed or not since a new
* local context could have become available
*/
if (!vtdec->ctxh)
vtdec->ctxh = gst_gl_context_helper_new (GST_ELEMENT (vtdec));
gst_gl_context_helper_ensure_context (vtdec->ctxh);
GST_INFO_OBJECT (vtdec, "pushing textures, context %p old context %p",
vtdec->ctxh->context,
vtdec->texture_cache ? vtdec->texture_cache->ctx : NULL);
if (vtdec->texture_cache
&& vtdec->texture_cache->ctx != vtdec->ctxh->context) {
gst_video_texture_cache_free (vtdec->texture_cache);
vtdec->texture_cache = NULL;
}
if (!vtdec->texture_cache)
setup_texture_cache (vtdec, vtdec->ctxh->context);
}
if (prevcaps)
gst_caps_unref (prevcaps);
if (err != noErr)
return FALSE;
return GST_VIDEO_DECODER_CLASS (gst_vtdec_parent_class)->negotiate (decoder);
}
static gboolean
gst_vtdec_set_format (GstVideoDecoder * decoder, GstVideoCodecState * state)
{
GstStructure *structure;
CMVideoCodecType cm_format = 0;
CMFormatDescriptionRef format_description = NULL;
const char *caps_name;
GstVtdec *vtdec = GST_VTDEC (decoder);
GST_DEBUG_OBJECT (vtdec, "set_format");
structure = gst_caps_get_structure (state->caps, 0);
caps_name = gst_structure_get_name (structure);
if (!strcmp (caps_name, "video/x-h264")) {
cm_format = kCMVideoCodecType_H264;
} else if (!strcmp (caps_name, "video/mpeg")) {
cm_format = kCMVideoCodecType_MPEG2Video;
} else if (!strcmp (caps_name, "image/jpeg")) {
cm_format = kCMVideoCodecType_JPEG;
}
if (cm_format == kCMVideoCodecType_H264 && state->codec_data == NULL) {
GST_INFO_OBJECT (vtdec, "no codec data, wait for one");
return TRUE;
}
gst_video_info_from_caps (&vtdec->video_info, state->caps);
if (!gst_vtdec_compute_reorder_queue_length (vtdec, cm_format,
state->codec_data))
return FALSE;
gst_vtdec_set_latency (vtdec);
if (state->codec_data) {
format_description = create_format_description_from_codec_data (vtdec,
cm_format, state->codec_data);
} else {
format_description = create_format_description (vtdec, cm_format);
}
if (vtdec->format_description)
CFRelease (vtdec->format_description);
vtdec->format_description = format_description;
if (vtdec->input_state)
gst_video_codec_state_unref (vtdec->input_state);
vtdec->input_state = gst_video_codec_state_ref (state);
return gst_video_decoder_negotiate (decoder);
}
static gboolean
gst_vtdec_flush (GstVideoDecoder * decoder)
{
GstVtdec *vtdec = GST_VTDEC (decoder);
GST_DEBUG_OBJECT (vtdec, "flush");
gst_vtdec_push_frames_if_needed (vtdec, FALSE, TRUE);
return TRUE;
}
static GstFlowReturn
gst_vtdec_finish (GstVideoDecoder * decoder)
{
GstVtdec *vtdec = GST_VTDEC (decoder);
GST_DEBUG_OBJECT (vtdec, "finish");
return gst_vtdec_push_frames_if_needed (vtdec, TRUE, FALSE);
}
static GstFlowReturn
gst_vtdec_handle_frame (GstVideoDecoder * decoder, GstVideoCodecFrame * frame)
{
OSStatus status;
CMSampleBufferRef cm_sample_buffer = NULL;
VTDecodeFrameFlags input_flags, output_flags;
GstVtdec *vtdec = GST_VTDEC (decoder);
GstFlowReturn ret = GST_FLOW_OK;
int decode_frame_number = frame->decode_frame_number;
if (vtdec->format_description == NULL) {
ret = GST_FLOW_NOT_NEGOTIATED;
goto out;
}
GST_LOG_OBJECT (vtdec, "got input frame %d", decode_frame_number);
ret = gst_vtdec_push_frames_if_needed (vtdec, FALSE, FALSE);
if (ret != GST_FLOW_OK)
return ret;
/* don't bother enabling kVTDecodeFrame_EnableTemporalProcessing at all since
* it's not mandatory for the underlying VT codec to respect it. KISS and do
* reordering ourselves.
*/
input_flags = kVTDecodeFrame_EnableAsynchronousDecompression;
output_flags = 0;
cm_sample_buffer =
cm_sample_buffer_from_gst_buffer (vtdec, frame->input_buffer);
status =
VTDecompressionSessionDecodeFrame (vtdec->session, cm_sample_buffer,
input_flags, frame, NULL);
if (status != noErr && FALSE)
goto error;
GST_LOG_OBJECT (vtdec, "submitted input frame %d", decode_frame_number);
out:
if (cm_sample_buffer)
CFRelease (cm_sample_buffer);
return ret;
error:
GST_ELEMENT_ERROR (vtdec, STREAM, DECODE, (NULL),
("VTDecompressionSessionDecodeFrame returned %d", (int) status));
ret = GST_FLOW_ERROR;
goto out;
}
static void
gst_vtdec_invalidate_session (GstVtdec * vtdec)
{
g_return_if_fail (vtdec->session);
VTDecompressionSessionInvalidate (vtdec->session);
CFRelease (vtdec->session);
vtdec->session = NULL;
}
static OSStatus
gst_vtdec_create_session (GstVtdec * vtdec, GstVideoFormat format,
gboolean enable_hardware)
{
CFMutableDictionaryRef output_image_buffer_attrs;
VTDecompressionOutputCallbackRecord callback;
CFMutableDictionaryRef videoDecoderSpecification;
OSStatus status;
guint32 cv_format = 0;
g_return_val_if_fail (vtdec->session == NULL, FALSE);
switch (format) {
case GST_VIDEO_FORMAT_NV12:
cv_format = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
break;
case GST_VIDEO_FORMAT_UYVY:
cv_format = kCVPixelFormatType_422YpCbCr8;
break;
case GST_VIDEO_FORMAT_RGBA:
cv_format = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
break;
default:
g_warn_if_reached ();
break;
}
videoDecoderSpecification =
CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
/* This is the default on iOS and the key does not exist there */
#ifndef HAVE_IOS
gst_vtutil_dict_set_boolean (videoDecoderSpecification,
kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder,
enable_hardware);
if (enable_hardware && vtdec->require_hardware)
gst_vtutil_dict_set_boolean (videoDecoderSpecification,
kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
TRUE);
#endif
output_image_buffer_attrs =
CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
gst_vtutil_dict_set_i32 (output_image_buffer_attrs,
kCVPixelBufferPixelFormatTypeKey, cv_format);
gst_vtutil_dict_set_i32 (output_image_buffer_attrs, kCVPixelBufferWidthKey,
vtdec->video_info.width);
gst_vtutil_dict_set_i32 (output_image_buffer_attrs, kCVPixelBufferHeightKey,
vtdec->video_info.height);
callback.decompressionOutputCallback = gst_vtdec_session_output_callback;
callback.decompressionOutputRefCon = vtdec;
status = VTDecompressionSessionCreate (NULL, vtdec->format_description,
videoDecoderSpecification, output_image_buffer_attrs, &callback,
&vtdec->session);
CFRelease (output_image_buffer_attrs);
return status;
}
static CMFormatDescriptionRef
create_format_description (GstVtdec * vtdec, CMVideoCodecType cm_format)
{
OSStatus status;
CMFormatDescriptionRef format_description;
status = CMVideoFormatDescriptionCreate (NULL,
cm_format, vtdec->video_info.width, vtdec->video_info.height,
NULL, &format_description);
if (status != noErr)
return NULL;
return format_description;
}
static CMFormatDescriptionRef
create_format_description_from_codec_data (GstVtdec * vtdec,
CMVideoCodecType cm_format, GstBuffer * codec_data)
{
CMFormatDescriptionRef fmt_desc;
CFMutableDictionaryRef extensions, par, atoms;
GstMapInfo map;
OSStatus status;
/* Extensions dict */
extensions =
CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
gst_vtutil_dict_set_string (extensions,
CFSTR ("CVImageBufferChromaLocationBottomField"), "left");
gst_vtutil_dict_set_string (extensions,
CFSTR ("CVImageBufferChromaLocationTopField"), "left");
gst_vtutil_dict_set_boolean (extensions, CFSTR ("FullRangeVideo"), FALSE);
/* CVPixelAspectRatio dict */
par = CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
gst_vtutil_dict_set_i32 (par, CFSTR ("HorizontalSpacing"),
vtdec->video_info.par_n);
gst_vtutil_dict_set_i32 (par, CFSTR ("VerticalSpacing"),
vtdec->video_info.par_d);
gst_vtutil_dict_set_object (extensions, CFSTR ("CVPixelAspectRatio"),
(CFTypeRef *) par);
/* SampleDescriptionExtensionAtoms dict */
gst_buffer_map (codec_data, &map, GST_MAP_READ);
atoms = CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
gst_vtutil_dict_set_data (atoms, CFSTR ("avcC"), map.data, map.size);
gst_vtutil_dict_set_object (extensions,
CFSTR ("SampleDescriptionExtensionAtoms"), (CFTypeRef *) atoms);
gst_buffer_unmap (codec_data, &map);
status = CMVideoFormatDescriptionCreate (NULL,
cm_format, vtdec->video_info.width, vtdec->video_info.height,
extensions, &fmt_desc);
if (status == noErr)
return fmt_desc;
else
return NULL;
}
/* Custom FreeBlock function for CMBlockBuffer */
static void
cm_block_buffer_freeblock (void *refCon, void *doomedMemoryBlock,
size_t sizeInBytes)
{
GstMapInfo *info = (GstMapInfo *) refCon;
gst_memory_unmap (info->memory, info);
gst_memory_unref (info->memory);
g_slice_free (GstMapInfo, info);
}
static CMBlockBufferRef
cm_block_buffer_from_gst_buffer (GstBuffer * buf, GstMapFlags flags)
{
OSStatus status;
CMBlockBufferRef bbuf;
CMBlockBufferCustomBlockSource blockSource;
guint memcount, i;
/* Initialize custom block source structure */
blockSource.version = kCMBlockBufferCustomBlockSourceVersion;
blockSource.AllocateBlock = NULL;
blockSource.FreeBlock = cm_block_buffer_freeblock;
/* Determine number of memory blocks */
memcount = gst_buffer_n_memory (buf);
status = CMBlockBufferCreateEmpty (NULL, memcount, 0, &bbuf);
if (status != kCMBlockBufferNoErr) {
GST_ERROR ("CMBlockBufferCreateEmpty returned %d", (int) status);
return NULL;
}
/* Go over all GstMemory objects and add them to the CMBlockBuffer */
for (i = 0; i < memcount; ++i) {
GstMemory *mem;
GstMapInfo *info;
mem = gst_buffer_get_memory (buf, i);
info = g_slice_new (GstMapInfo);
if (!gst_memory_map (mem, info, flags)) {
GST_ERROR ("failed mapping memory");
g_slice_free (GstMapInfo, info);
gst_memory_unref (mem);
CFRelease (bbuf);
return NULL;
}
blockSource.refCon = info;
status =
CMBlockBufferAppendMemoryBlock (bbuf, info->data, info->size, NULL,
&blockSource, 0, info->size, 0);
if (status != kCMBlockBufferNoErr) {
GST_ERROR ("CMBlockBufferAppendMemoryBlock returned %d", (int) status);
gst_memory_unmap (mem, info);
g_slice_free (GstMapInfo, info);
gst_memory_unref (mem);
CFRelease (bbuf);
return NULL;
}
}
return bbuf;
}
static CMSampleBufferRef
cm_sample_buffer_from_gst_buffer (GstVtdec * vtdec, GstBuffer * buf)
{
OSStatus status;
CMBlockBufferRef bbuf = NULL;
CMSampleBufferRef sbuf = NULL;
CMSampleTimingInfo sample_timing;
CMSampleTimingInfo time_array[1];
g_return_val_if_fail (vtdec->format_description, NULL);
/* create a block buffer */
bbuf = cm_block_buffer_from_gst_buffer (buf, GST_MAP_READ);
if (bbuf == NULL) {
GST_ELEMENT_ERROR (vtdec, RESOURCE, FAILED, (NULL),
("failed creating CMBlockBuffer"));
return NULL;
}
/* create a sample buffer */
if (GST_BUFFER_DURATION_IS_VALID (buf))
sample_timing.duration = CMTimeMake (GST_BUFFER_DURATION (buf), GST_SECOND);
else
sample_timing.duration = kCMTimeInvalid;
if (GST_BUFFER_PTS_IS_VALID (buf))
sample_timing.presentationTimeStamp =
CMTimeMake (GST_BUFFER_PTS (buf), GST_SECOND);
else
sample_timing.presentationTimeStamp = kCMTimeInvalid;
if (GST_BUFFER_DTS_IS_VALID (buf))
sample_timing.decodeTimeStamp =
CMTimeMake (GST_BUFFER_DTS (buf), GST_SECOND);
else
sample_timing.decodeTimeStamp = kCMTimeInvalid;
time_array[0] = sample_timing;
status =
CMSampleBufferCreate (NULL, bbuf, TRUE, 0, 0, vtdec->format_description,
1, 1, time_array, 0, NULL, &sbuf);
CFRelease (bbuf);
if (status != noErr) {
GST_ELEMENT_ERROR (vtdec, RESOURCE, FAILED, (NULL),
("CMSampleBufferCreate returned %d", (int) status));
return NULL;
}
return sbuf;
}
static gint
sort_frames_by_pts (gconstpointer f1, gconstpointer f2, gpointer user_data)
{
GstVideoCodecFrame *frame1, *frame2;
GstClockTime pts1, pts2;
frame1 = (GstVideoCodecFrame *) f1;
frame2 = (GstVideoCodecFrame *) f2;
pts1 = pts2 = GST_CLOCK_TIME_NONE;
if (frame1->output_buffer)
pts1 = GST_BUFFER_PTS (frame1->output_buffer);
if (frame2->output_buffer)
pts2 = GST_BUFFER_PTS (frame2->output_buffer);
if (!GST_CLOCK_TIME_IS_VALID (pts1) || !GST_CLOCK_TIME_IS_VALID (pts2))
return 0;
if (pts1 < pts2)
return -1;
else if (pts1 == pts2)
return 0;
else
return 1;
}
static void
gst_vtdec_session_output_callback (void *decompression_output_ref_con,
void *source_frame_ref_con, OSStatus status, VTDecodeInfoFlags info_flags,
CVImageBufferRef image_buffer, CMTime pts, CMTime duration)
{
GstVtdec *vtdec = (GstVtdec *) decompression_output_ref_con;
GstVideoCodecFrame *frame = (GstVideoCodecFrame *) source_frame_ref_con;
GstVideoCodecState *state;
GST_LOG_OBJECT (vtdec, "got output frame %p %d and VT buffer %p", frame,
frame->decode_frame_number, image_buffer);
frame->output_buffer = NULL;
if (status != noErr) {
GST_ERROR_OBJECT (vtdec, "Error decoding frame %d", (int) status);
}
if (image_buffer) {
GstBuffer *buf = NULL;
/* FIXME: use gst_video_decoder_allocate_output_buffer */
state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (vtdec));
if (state == NULL) {
GST_WARNING_OBJECT (vtdec, "Output state not configured, release buffer");
frame->flags &= VTDEC_FRAME_FLAG_SKIP;
} else {
buf =
gst_core_video_buffer_new (image_buffer, &state->info,
vtdec->texture_cache);
gst_video_codec_state_unref (state);
GST_BUFFER_PTS (buf) = pts.value;
GST_BUFFER_DURATION (buf) = duration.value;
frame->output_buffer = buf;
}
} else {
if (info_flags & kVTDecodeInfo_FrameDropped) {
GST_DEBUG_OBJECT (vtdec, "Frame dropped by video toolbox %p %d",
frame, frame->decode_frame_number);
frame->flags |= VTDEC_FRAME_FLAG_DROP;
} else {
GST_DEBUG_OBJECT (vtdec, "Decoded frame is NULL");
frame->flags |= VTDEC_FRAME_FLAG_SKIP;
}
}
g_async_queue_push_sorted (vtdec->reorder_queue, frame,
sort_frames_by_pts, NULL);
}
static GstFlowReturn
gst_vtdec_push_frames_if_needed (GstVtdec * vtdec, gboolean drain,
gboolean flush)
{
GstVideoCodecFrame *frame;
GstFlowReturn ret = GST_FLOW_OK;
GstVideoDecoder *decoder = GST_VIDEO_DECODER (vtdec);
/* negotiate now so that we know whether we need to use the GL upload meta or
* not */
if (gst_pad_check_reconfigure (decoder->srcpad)) {
if (!gst_video_decoder_negotiate (decoder)) {
gst_pad_mark_reconfigure (decoder->srcpad);
if (GST_PAD_IS_FLUSHING (decoder->srcpad))
ret = GST_FLOW_FLUSHING;
else
ret = GST_FLOW_NOT_NEGOTIATED;
return ret;
}
}
if (drain)
VTDecompressionSessionWaitForAsynchronousFrames (vtdec->session);
/* push a buffer if there are enough frames to guarantee that we push in PTS
* order
*/
while ((g_async_queue_length (vtdec->reorder_queue) >=
vtdec->reorder_queue_length) || drain || flush) {
frame = (GstVideoCodecFrame *) g_async_queue_try_pop (vtdec->reorder_queue);
/* we need to check this in case reorder_queue_length=0 (jpeg for
* example) or we're draining/flushing
*/
if (frame) {
if (flush || frame->flags & VTDEC_FRAME_FLAG_SKIP)
gst_video_decoder_release_frame (decoder, frame);
else if (frame->flags & VTDEC_FRAME_FLAG_DROP)
gst_video_decoder_drop_frame (decoder, frame);
else
ret = gst_video_decoder_finish_frame (decoder, frame);
}
if (!frame || ret != GST_FLOW_OK)
break;
}
return ret;
}
static gboolean
parse_h264_profile_and_level_from_codec_data (GstVtdec * vtdec,
GstBuffer * codec_data, int *profile, int *level)
{
GstMapInfo map;
guint8 *data;
gint size;
gboolean ret = TRUE;
gst_buffer_map (codec_data, &map, GST_MAP_READ);
data = map.data;
size = map.size;
/* parse the avcC data */
if (size < 7)
goto avcc_too_small;
/* parse the version, this must be 1 */
if (data[0] != 1)
goto wrong_version;
/* AVCProfileIndication */
/* profile_compat */
/* AVCLevelIndication */
if (profile)
*profile = data[1];
if (level)
*level = data[3];
out:
gst_buffer_unmap (codec_data, &map);
return ret;
avcc_too_small:
GST_ELEMENT_ERROR (vtdec, STREAM, DECODE, (NULL),
("invalid codec_data buffer length"));
ret = FALSE;
goto out;
wrong_version:
GST_ELEMENT_ERROR (vtdec, STREAM, DECODE, (NULL),
("wrong avcC version in codec_data"));
ret = FALSE;
goto out;
}
static int
get_dpb_max_mb_s_from_level (GstVtdec * vtdec, int level)
{
switch (level) {
case 10:
/* 1b?? */
return 396;
case 11:
return 900;
case 12:
case 13:
case 20:
return 2376;
case 21:
return 4752;
case 22:
case 30:
return 8100;
case 31:
return 18000;
case 32:
return 20480;
case 40:
case 41:
return 32768;
case 42:
return 34816;
case 50:
return 110400;
case 51:
case 52:
return 184320;
default:
GST_ERROR_OBJECT (vtdec, "unknown level %d", level);
return -1;
}
}
static gboolean
gst_vtdec_compute_reorder_queue_length (GstVtdec * vtdec,
CMVideoCodecType cm_format, GstBuffer * codec_data)
{
if (cm_format == kCMVideoCodecType_H264) {
if (!compute_h264_decode_picture_buffer_length (vtdec, codec_data,
&vtdec->reorder_queue_length)) {
return FALSE;
}
} else {
vtdec->reorder_queue_length = 0;
}
return TRUE;
}
static gboolean
compute_h264_decode_picture_buffer_length (GstVtdec * vtdec,
GstBuffer * codec_data, int *length)
{
int profile, level;
int dpb_mb_size = 16;
int max_dpb_size_frames = 16;
int max_dpb_mb_s = -1;
int width_in_mb_s = GST_ROUND_UP_16 (vtdec->video_info.width) / dpb_mb_size;
int height_in_mb_s = GST_ROUND_UP_16 (vtdec->video_info.height) / dpb_mb_size;
*length = 0;
if (!parse_h264_profile_and_level_from_codec_data (vtdec, codec_data,
&profile, &level))
return FALSE;
if (vtdec->video_info.width == 0 || vtdec->video_info.height == 0)
return FALSE;
GST_INFO_OBJECT (vtdec, "parsed profile %d, level %d", profile, level);
if (profile == 66) {
/* baseline or constrained-baseline, we don't need to reorder */
return TRUE;
}
max_dpb_mb_s = get_dpb_max_mb_s_from_level (vtdec, level);
if (max_dpb_mb_s == -1) {
GST_ELEMENT_ERROR (vtdec, STREAM, DECODE, (NULL),
("invalid level in codec_data, could not compute max_dpb_mb_s"));
return FALSE;
}
/* this formula is specified in sections A.3.1.h and A.3.2.f of the 2009
* edition of the standard */
*length = MIN (floor (max_dpb_mb_s / (width_in_mb_s * height_in_mb_s)),
max_dpb_size_frames);
return TRUE;
}
static void
gst_vtdec_set_latency (GstVtdec * vtdec)
{
GstClockTime frame_duration;
GstClockTime latency;
if (vtdec->video_info.fps_n == 0) {
GST_INFO_OBJECT (vtdec, "Framerate not known, can't set latency");
return;
}
frame_duration = gst_util_uint64_scale (GST_SECOND,
vtdec->video_info.fps_d, vtdec->video_info.fps_n);
latency = frame_duration * vtdec->reorder_queue_length;
GST_INFO_OBJECT (vtdec, "setting latency frames:%d time:%" GST_TIME_FORMAT,
vtdec->reorder_queue_length, GST_TIME_ARGS (latency));
gst_video_decoder_set_latency (GST_VIDEO_DECODER (vtdec), latency, latency);
}
static void
gst_vtdec_set_context (GstElement * element, GstContext * context)
{
GstVtdec *vtdec = GST_VTDEC (element);
GST_INFO_OBJECT (element, "setting context %s",
gst_context_get_context_type (context));
if (!vtdec->ctxh)
vtdec->ctxh = gst_gl_context_helper_new (element);
gst_gl_handle_set_context (element, context,
&vtdec->ctxh->display, &vtdec->ctxh->other_context);
GST_ELEMENT_CLASS (gst_vtdec_parent_class)->set_context (element, context);
}
#ifndef HAVE_IOS
#define GST_TYPE_VTDEC_HW (gst_vtdec_hw_get_type())
#define GST_VTDEC_HW(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VTDEC_HW,GstVtdecHw))
#define GST_VTDEC_HW_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VTDEC_HW,GstVtdecHwClass))
#define GST_IS_VTDEC_HW(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VTDEC_HW))
#define GST_IS_VTDEC_HW_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VTDEC_HW))
typedef GstVtdec GstVtdecHw;
typedef GstVtdecClass GstVtdecHwClass;
GType gst_vtdec_hw_get_type (void);
G_DEFINE_TYPE (GstVtdecHw, gst_vtdec_hw, GST_TYPE_VTDEC);
static void
gst_vtdec_hw_class_init (GstVtdecHwClass * klass)
{
gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
"Apple VideoToolbox decoder (hardware only)",
"Codec/Decoder/Video",
"Apple VideoToolbox Decoder",
"Ole André Vadla Ravnås <oleavr@soundrop.com>; "
"Alessandro Decina <alessandro.d@gmail.com>");
}
static void
gst_vtdec_hw_init (GstVtdecHw * vtdec)
{
GST_VTDEC (vtdec)->require_hardware = TRUE;
}
#endif
void
gst_vtdec_register_elements (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_vtdec_debug_category, "vtdec", 0,
"debug category for vtdec element");
#ifdef HAVE_IOS
gst_element_register (plugin, "vtdec", GST_RANK_PRIMARY, GST_TYPE_VTDEC);
#else
gst_element_register (plugin, "vtdec_hw", GST_RANK_PRIMARY + 1,
GST_TYPE_VTDEC_HW);
gst_element_register (plugin, "vtdec", GST_RANK_SECONDARY, GST_TYPE_VTDEC);
#endif
}
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