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gstreamer/subprojects/gst-plugins-bad/sys/applemedia/vtdec.c
Piotr Brzeziński e5b5d223b4 vtdec: Use GST_VIDEO_DECODER_ERROR instead of aborting when frame has an ERROR flag 
This was already being used in handle_frame() for errors that happen when queueing a frame for decoding,
let's do the same when a frame is flagged with an error in the output callback.
From quick testing, this makes seeking more reliable (previously, it would sometimes cause a decoding error
and shut the whole decoder down due to GST_FLOW_ERROR).

Also manually sets the max error count to actually stop processing if too many errors occur.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6446>
2024-06-17 12:42:53 +00:00

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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: vtdec
*
* Apple VideoToolbox based decoder which might use a HW or a SW
* implementation depending on the device.
*
* ## 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.
*
*/
/**
* SECTION:element-vtdec_hw
* @title: vtdec_hw
*
* Apple VideoToolbox based HW-only decoder.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v filesrc location=file.mov ! qtdemux ! queue ! h264parse ! vtdec_hw ! 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 "helpers.h"
#include "corevideobuffer.h"
#include "coremediabuffer.h"
#include "videotexturecache-gl.h"
#if defined(APPLEMEDIA_MOLTENVK)
#include "videotexturecache-vulkan.h"
#endif
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),
VTDEC_FRAME_FLAG_ERROR = (1 << 12),
};
static void gst_vtdec_finalize (GObject * object);
static gboolean gst_vtdec_start (GstVideoDecoder * decoder);
static gboolean gst_vtdec_stop (GstVideoDecoder * decoder);
static void gst_vtdec_output_loop (GstVtdec * self);
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 gboolean gst_vtdec_sink_event (GstVideoDecoder * decoder,
GstEvent * event);
static GstStateChangeReturn gst_vtdec_change_state (GstElement * element,
GstStateChange transition);
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_drain_decoder (GstVideoDecoder * decoder,
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_size (GstVtdec * vtdec,
GstBuffer * codec_data, int *length);
static gboolean compute_hevc_decode_picture_buffer_size (GstVtdec * vtdec,
GstBuffer * codec_data, int *length);
static gboolean gst_vtdec_compute_dpb_size (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/x-h265, stream-format=(string){ hev1, hvc1 }, alignment=au,"
" width=(int)[1, MAX], height=(int)[1, MAX];"
"video/mpeg, mpegversion=2, systemstream=false, parsed=true;"
"image/jpeg;"
"video/x-prores, variant = { (string)standard, (string)hq, (string)lt,"
" (string)proxy, (string)4444, (string)4444xq };")
);
/* 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_FORMATS "{ NV12, AYUV64, ARGB64_BE }"
#define VIDEO_SRC_CAPS_NATIVE \
GST_VIDEO_CAPS_MAKE(VIDEO_SRC_CAPS_FORMATS) ";" \
GST_VIDEO_CAPS_MAKE_WITH_FEATURES(GST_CAPS_FEATURE_MEMORY_GL_MEMORY,\
VIDEO_SRC_CAPS_FORMATS) ", " \
"texture-target = (string) rectangle "
#if defined(APPLEMEDIA_MOLTENVK)
#define VIDEO_SRC_CAPS VIDEO_SRC_CAPS_NATIVE "; " \
GST_VIDEO_CAPS_MAKE_WITH_FEATURES(GST_CAPS_FEATURE_MEMORY_VULKAN_IMAGE, \
VIDEO_SRC_CAPS_FORMATS)
#else
#define VIDEO_SRC_CAPS VIDEO_SRC_CAPS_NATIVE
#endif
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);
{
GstCaps *caps = gst_caps_from_string (VIDEO_SRC_CAPS);
/* RGBA64_LE is kCVPixelFormatType_64RGBALE, only available on macOS 11.3+ */
if (GST_APPLEMEDIA_HAVE_64RGBALE)
caps = gst_vtutil_caps_append_video_format (caps, "RGBA64_LE");
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, caps));
}
gst_element_class_set_static_metadata (element_class,
"Apple VideoToolbox decoder",
"Codec/Decoder/Video/Hardware",
"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;
element_class->change_state = gst_vtdec_change_state;
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);
video_decoder_class->sink_event = GST_DEBUG_FUNCPTR (gst_vtdec_sink_event);
}
static void
gst_vtdec_init (GstVtdec * vtdec)
{
g_mutex_init (&vtdec->queue_mutex);
g_cond_init (&vtdec->queue_cond);
}
void
gst_vtdec_finalize (GObject * object)
{
GstVtdec *vtdec = GST_VTDEC (object);
GST_DEBUG_OBJECT (vtdec, "finalize");
g_mutex_clear (&vtdec->queue_mutex);
g_cond_clear (&vtdec->queue_cond);
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");
vtdec->is_flushing = FALSE;
vtdec->is_draining = FALSE;
vtdec->downstream_ret = GST_FLOW_OK;
vtdec->reorder_queue = gst_vec_deque_new (0);
/* Create the output task, but pause it immediately */
vtdec->pause_task = TRUE;
if (!gst_pad_start_task (GST_VIDEO_DECODER_SRC_PAD (decoder),
(GstTaskFunction) gst_vtdec_output_loop, vtdec, NULL)) {
GST_ERROR_OBJECT (vtdec, "failed to start output thread");
return FALSE;
}
/* This blocks until the loop actually pauses */
gst_pad_pause_task (GST_VIDEO_DECODER_SRC_PAD (decoder));
vtdec->pause_task = FALSE;
if (!vtdec->ctxh)
vtdec->ctxh = gst_gl_context_helper_new (GST_ELEMENT (decoder));
return TRUE;
}
static gboolean
gst_vtdec_stop (GstVideoDecoder * decoder)
{
GstVideoCodecFrame *frame;
GstVtdec *vtdec = GST_VTDEC (decoder);
GST_DEBUG_OBJECT (vtdec, "stop");
gst_vtdec_drain_decoder (GST_VIDEO_DECODER_CAST (vtdec), TRUE);
vtdec->downstream_ret = GST_FLOW_FLUSHING;
while ((frame = gst_vec_deque_pop_head (vtdec->reorder_queue))) {
gst_video_decoder_release_frame (decoder, frame);
}
gst_vec_deque_free (vtdec->reorder_queue);
vtdec->reorder_queue = NULL;
gst_pad_stop_task (GST_VIDEO_DECODER_SRC_PAD (decoder));
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)
g_object_unref (vtdec->texture_cache);
vtdec->texture_cache = NULL;
if (vtdec->ctxh)
gst_gl_context_helper_free (vtdec->ctxh);
vtdec->ctxh = NULL;
if (vtdec->format_description)
CFRelease (vtdec->format_description);
vtdec->format_description = NULL;
#if defined(APPLEMEDIA_MOLTENVK)
gst_clear_object (&vtdec->device);
gst_clear_object (&vtdec->instance);
#endif
return TRUE;
}
static void
gst_vtdec_output_loop (GstVtdec * vtdec)
{
GstVideoCodecFrame *frame;
GstFlowReturn ret = GST_FLOW_OK;
GstVideoDecoder *decoder = GST_VIDEO_DECODER (vtdec);
gboolean is_flushing;
g_mutex_lock (&vtdec->queue_mutex);
while (gst_vec_deque_is_empty (vtdec->reorder_queue)
&& !vtdec->pause_task && !vtdec->is_flushing && !vtdec->is_draining) {
g_cond_wait (&vtdec->queue_cond, &vtdec->queue_mutex);
}
if (vtdec->pause_task) {
g_mutex_unlock (&vtdec->queue_mutex);
gst_pad_pause_task (GST_VIDEO_DECODER_SRC_PAD (decoder));
return;
}
/* push a buffer if there are enough frames to guarantee
* that we push in PTS order, or if we're draining/flushing */
while ((gst_vec_deque_get_length (vtdec->reorder_queue) >=
vtdec->dbp_size) || vtdec->is_flushing || vtdec->is_draining) {
frame = gst_vec_deque_pop_head (vtdec->reorder_queue);
is_flushing = vtdec->is_flushing;
g_cond_signal (&vtdec->queue_cond);
g_mutex_unlock (&vtdec->queue_mutex);
/* we need to check this in case dpb_size=0 (jpeg for
* example) or we're draining/flushing */
if (frame) {
GST_VIDEO_DECODER_STREAM_LOCK (vtdec);
if (frame->flags & VTDEC_FRAME_FLAG_ERROR) {
GST_VIDEO_DECODER_ERROR (vtdec, 1, STREAM, DECODE,
("Got frame %d with an error flag", frame->system_frame_number),
(NULL), ret);
gst_video_decoder_release_frame (decoder, frame);
} else if (is_flushing || (frame->flags & VTDEC_FRAME_FLAG_SKIP)) {
GST_LOG_OBJECT (vtdec, "flushing frame %d", frame->system_frame_number);
gst_video_decoder_release_frame (decoder, frame);
} else if (frame->flags & VTDEC_FRAME_FLAG_DROP) {
GST_LOG_OBJECT (vtdec, "dropping frame %d", frame->system_frame_number);
gst_video_decoder_drop_frame (decoder, frame);
} else {
GST_TRACE_OBJECT (vtdec, "pushing frame %d",
frame->system_frame_number);
ret = gst_video_decoder_finish_frame (decoder, frame);
}
GST_VIDEO_DECODER_STREAM_UNLOCK (vtdec);
}
g_mutex_lock (&vtdec->queue_mutex);
if (!frame || ret != GST_FLOW_OK)
break;
}
g_mutex_unlock (&vtdec->queue_mutex);
GST_VIDEO_DECODER_STREAM_LOCK (vtdec);
vtdec->downstream_ret = ret;
/* We need to empty the queue immediately so that session_output_callback()
* can push out the current buffer, otherwise it can deadlock */
if (ret != GST_FLOW_OK) {
g_mutex_lock (&vtdec->queue_mutex);
while ((frame = gst_vec_deque_pop_head (vtdec->reorder_queue))) {
GST_LOG_OBJECT (vtdec, "flushing frame %d", frame->system_frame_number);
gst_video_decoder_release_frame (decoder, frame);
}
g_cond_signal (&vtdec->queue_cond);
g_mutex_unlock (&vtdec->queue_mutex);
}
GST_VIDEO_DECODER_STREAM_UNLOCK (vtdec);
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (vtdec, "pausing output task: %s",
gst_flow_get_name (ret));
gst_pad_pause_task (GST_VIDEO_DECODER_SRC_PAD (decoder));
}
}
static gboolean
gst_vtdec_ensure_output_loop (GstVtdec * vtdec)
{
GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (vtdec);
GstTask *task = GST_PAD_TASK (pad);
return gst_task_resume (task);
}
static void
gst_vtdec_pause_output_loop (GstVtdec * vtdec)
{
g_mutex_lock (&vtdec->queue_mutex);
vtdec->pause_task = TRUE;
g_cond_signal (&vtdec->queue_cond);
g_mutex_unlock (&vtdec->queue_mutex);
gst_pad_pause_task (GST_VIDEO_DECODER_SRC_PAD (vtdec));
GST_DEBUG_OBJECT (vtdec, "paused output thread");
g_mutex_lock (&vtdec->queue_mutex);
vtdec->pause_task = FALSE;
g_mutex_unlock (&vtdec->queue_mutex);
}
static void
setup_texture_cache (GstVtdec * vtdec, GstVideoFormat format)
{
GstVideoCodecState *output_state;
GST_INFO_OBJECT (vtdec, "setting up texture cache");
output_state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (vtdec));
gst_video_texture_cache_set_format (vtdec->texture_cache, format,
output_state->caps);
gst_video_codec_state_unref (output_state);
}
/*
* Unconditionally output a high bit-depth + alpha format when decoding Apple
* ProRes video if downstream supports it.
* TODO: read src_pix_fmt to get the preferred output format
* https://wiki.multimedia.cx/index.php/Apple_ProRes#Frame_header
*/
static GstVideoFormat
get_preferred_video_format (GstStructure * s, gboolean prores)
{
const GValue *list = gst_structure_get_value (s, "format");
guint i, size = gst_value_list_get_size (list);
for (i = 0; i < size; i++) {
const GValue *value = gst_value_list_get_value (list, i);
const char *fmt = g_value_get_string (value);
GstVideoFormat vfmt = gst_video_format_from_string (fmt);
switch (vfmt) {
case GST_VIDEO_FORMAT_NV12:
if (!prores)
return vfmt;
break;
case GST_VIDEO_FORMAT_AYUV64:
case GST_VIDEO_FORMAT_ARGB64_BE:
if (prores)
return vfmt;
break;
case GST_VIDEO_FORMAT_RGBA64_LE:
if (GST_APPLEMEDIA_HAVE_64RGBALE) {
if (prores)
return vfmt;
} else {
/* Codepath will never be hit on macOS older than Big Sur (11.3) */
g_warn_if_reached ();
}
break;
default:
break;
}
}
return GST_VIDEO_FORMAT_UNKNOWN;
}
static gboolean
gst_vtdec_negotiate (GstVideoDecoder * decoder)
{
GstVideoCodecState *output_state = NULL;
GstCaps *peercaps = NULL, *caps = NULL, *templcaps = NULL, *prevcaps = NULL;
GstVideoFormat format = GST_VIDEO_FORMAT_UNKNOWN;
GstVtdec *vtdec;
OSStatus err = noErr;
GstCapsFeatures *features = NULL;
gboolean output_textures = FALSE;
#if defined(APPLEMEDIA_MOLTENVK)
gboolean output_vulkan = FALSE;
#endif
vtdec = GST_VTDEC (decoder);
if (vtdec->session)
gst_vtdec_drain_decoder (GST_VIDEO_DECODER_CAST (vtdec), 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);
}
templcaps =
gst_pad_get_pad_template_caps (GST_VIDEO_DECODER_SRC_PAD (decoder));
peercaps =
gst_pad_peer_query_caps (GST_VIDEO_DECODER_SRC_PAD (vtdec), templcaps);
gst_caps_unref (templcaps);
if (gst_caps_is_empty (peercaps)) {
GST_INFO_OBJECT (vtdec, "empty peer caps, can't negotiate");
gst_caps_unref (peercaps);
if (prevcaps)
gst_caps_unref (prevcaps);
return FALSE;
}
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);
gst_caps_unref (peercaps);
} else {
caps = peercaps;
}
caps = gst_caps_truncate (gst_caps_make_writable (caps));
/* Try to use whatever video format downstream prefers */
{
GstStructure *s = gst_caps_get_structure (caps, 0);
if (gst_structure_has_field_typed (s, "format", GST_TYPE_LIST)) {
GstStructure *is = gst_caps_get_structure (vtdec->input_state->caps, 0);
const char *name = gst_structure_get_name (is);
format = get_preferred_video_format (s,
g_strcmp0 (name, "video/x-prores") == 0);
}
if (format == GST_VIDEO_FORMAT_UNKNOWN) {
const char *fmt;
gst_structure_fixate_field (s, "format");
fmt = gst_structure_get_string (s, "format");
if (fmt)
format = gst_video_format_from_string (fmt);
else
/* If all fails, just use NV12 */
format = GST_VIDEO_FORMAT_NV12;
}
}
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);
#if defined(APPLEMEDIA_MOLTENVK)
output_vulkan =
gst_caps_features_contains (features,
GST_CAPS_FEATURE_MEMORY_VULKAN_IMAGE);
#endif
}
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
&& ((GST_IS_VIDEO_TEXTURE_CACHE_GL (vtdec->texture_cache)
&& !output_textures)
#if defined(APPLEMEDIA_MOLTENVK)
|| (GST_IS_VIDEO_TEXTURE_CACHE_VULKAN (vtdec->texture_cache)
&& !output_vulkan)
#endif
)) {
g_object_unref (vtdec->texture_cache);
vtdec->texture_cache = NULL;
}
if (err == noErr) {
if (output_textures) {
GstVideoTextureCacheGL *cache_gl = NULL;
if (vtdec->texture_cache)
cache_gl = GST_VIDEO_TEXTURE_CACHE_GL (vtdec->texture_cache);
/* 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 GL textures, context %p old context %p",
vtdec->ctxh->context, cache_gl ? cache_gl->ctx : NULL);
if (cache_gl && cache_gl->ctx != vtdec->ctxh->context) {
g_object_unref (vtdec->texture_cache);
vtdec->texture_cache = NULL;
}
if (!vtdec->texture_cache) {
vtdec->texture_cache =
gst_video_texture_cache_gl_new (vtdec->ctxh->context);
setup_texture_cache (vtdec, format);
}
}
#if defined(APPLEMEDIA_MOLTENVK)
if (output_vulkan) {
GstVideoTextureCacheVulkan *cache_vulkan = NULL;
if (vtdec->texture_cache)
cache_vulkan = GST_VIDEO_TEXTURE_CACHE_VULKAN (vtdec->texture_cache);
gst_vulkan_ensure_element_data (GST_ELEMENT (vtdec), NULL,
&vtdec->instance);
if (!gst_vulkan_device_run_context_query (GST_ELEMENT (vtdec),
&vtdec->device)) {
GError *error = NULL;
GST_DEBUG_OBJECT (vtdec, "No device retrieved from peer elements");
if (!(vtdec->device =
gst_vulkan_instance_create_device (vtdec->instance, &error))) {
GST_ELEMENT_ERROR (vtdec, RESOURCE, NOT_FOUND,
("Failed to create vulkan device"), ("%s", error->message));
g_clear_error (&error);
return FALSE;
}
}
GST_INFO_OBJECT (vtdec, "pushing vulkan images, device %" GST_PTR_FORMAT
" old device %" GST_PTR_FORMAT, vtdec->device,
cache_vulkan ? cache_vulkan->device : NULL);
if (cache_vulkan && cache_vulkan->device != vtdec->device) {
g_object_unref (vtdec->texture_cache);
vtdec->texture_cache = NULL;
}
if (!vtdec->texture_cache) {
vtdec->texture_cache =
gst_video_texture_cache_vulkan_new (vtdec->device);
setup_texture_cache (vtdec, format);
}
}
#endif
}
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/x-h265")) {
cm_format = kCMVideoCodecType_HEVC;
} else if (!strcmp (caps_name, "video/mpeg")) {
cm_format = kCMVideoCodecType_MPEG2Video;
} else if (!strcmp (caps_name, "image/jpeg")) {
cm_format = kCMVideoCodecType_JPEG;
} else if (!strcmp (caps_name, "video/x-prores")) {
const char *variant = gst_structure_get_string (structure, "variant");
if (variant)
cm_format = gst_vtutil_codec_type_from_prores_variant (variant);
if (cm_format == GST_kCMVideoCodecType_Some_AppleProRes) {
GST_ERROR_OBJECT (vtdec, "Invalid ProRes variant %s", variant);
return FALSE;
}
}
if ((cm_format == kCMVideoCodecType_H264
|| cm_format == kCMVideoCodecType_HEVC)
&& 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_dpb_size (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_vtdec_negotiate (decoder);
}
static gboolean
gst_vtdec_flush (GstVideoDecoder * decoder)
{
GstVtdec *vtdec = GST_VTDEC (decoder);
GST_DEBUG_OBJECT (vtdec, "flush");
return gst_vtdec_drain_decoder (GST_VIDEO_DECODER_CAST (vtdec),
TRUE) == GST_FLOW_OK;
}
static GstFlowReturn
gst_vtdec_finish (GstVideoDecoder * decoder)
{
GstVtdec *vtdec = GST_VTDEC (decoder);
GST_DEBUG_OBJECT (vtdec, "finish");
return gst_vtdec_drain_decoder (GST_VIDEO_DECODER_CAST (vtdec), FALSE);
}
static gboolean
gst_vtdec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
{
GstVtdec *vtdec = GST_VTDEC (decoder);
GstEventType type = GST_EVENT_TYPE (event);
gboolean ret;
switch (type) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (vtdec, "flush start received, setting flushing flag");
g_mutex_lock (&vtdec->queue_mutex);
vtdec->is_flushing = TRUE;
g_cond_signal (&vtdec->queue_cond);
g_mutex_unlock (&vtdec->queue_mutex);
break;
default:
break;
}
ret =
GST_VIDEO_DECODER_CLASS (gst_vtdec_parent_class)->sink_event (decoder,
event);
switch (type) {
case GST_EVENT_FLUSH_STOP:
/* The base class handles this event and calls _flush().
* We can then safely reset the flushing flag. */
GST_DEBUG_OBJECT (vtdec, "flush stop received, removing flushing flag");
g_mutex_lock (&vtdec->queue_mutex);
vtdec->is_flushing = FALSE;
g_mutex_unlock (&vtdec->queue_mutex);
break;
default:
break;
}
return ret;
}
static GstStateChangeReturn
gst_vtdec_change_state (GstElement * element, GstStateChange transition)
{
GstVtdec *self = GST_VTDEC (element);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
GST_DEBUG_OBJECT (self, "pausing output loop on PAUSED->READY");
gst_vtdec_pause_output_loop (self);
}
return GST_ELEMENT_CLASS (gst_vtdec_parent_class)->change_state (element,
transition);
}
static GstFlowReturn
gst_vtdec_handle_frame (GstVideoDecoder * decoder, GstVideoCodecFrame * frame)
{
OSStatus status;
CMSampleBufferRef cm_sample_buffer = NULL;
VTDecodeFrameFlags input_flags;
GstVtdec *vtdec = GST_VTDEC (decoder);
GstFlowReturn ret = GST_FLOW_OK;
int decode_frame_number = frame->decode_frame_number;
GstTaskState task_state;
gboolean is_flushing;
if (vtdec->format_description == NULL) {
ret = GST_FLOW_NOT_NEGOTIATED;
goto drop;
}
/* Negotiate now so that we know whether we need to use the GL upload meta or not.
* gst_vtenc_negotiate() will drain before attempting to negotiate. */
if (gst_pad_check_reconfigure (decoder->srcpad)) {
if (!gst_vtdec_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;
goto drop;
}
}
task_state = gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (vtdec));
if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
/* Abort if our loop failed to push frames downstream... */
if (vtdec->downstream_ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (vtdec,
"Output loop stopped because of %s, ignoring frame",
gst_flow_get_name (vtdec->downstream_ret));
ret = vtdec->downstream_ret;
goto drop;
}
/* ...or if it stopped because of the flushing flag while the queue
* was empty, in which case we didn't get GST_FLOW_FLUSHING... */
g_mutex_lock (&vtdec->queue_mutex);
is_flushing = vtdec->is_flushing;
g_mutex_unlock (&vtdec->queue_mutex);
if (is_flushing) {
GST_DEBUG_OBJECT (vtdec, "Flushing flag set, ignoring frame");
ret = GST_FLOW_FLUSHING;
goto drop;
}
/* .. or if it refuses to resume - e.g. it was stopped instead of paused */
if (!gst_vtdec_ensure_output_loop (vtdec)) {
GST_ERROR_OBJECT (vtdec, "Output loop failed to resume");
ret = GST_FLOW_ERROR;
goto drop;
}
}
GST_LOG_OBJECT (vtdec, "got input frame %d", decode_frame_number);
/* 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;
cm_sample_buffer =
cm_sample_buffer_from_gst_buffer (vtdec, frame->input_buffer);
/* We need to unlock the stream lock here because
* the decode call can wait until gst_vtdec_session_output_callback()
* is finished, which in turn can wait until there's space in the
* output queue, which is being handled by the output loop,
* which also uses the stream lock... */
GST_VIDEO_DECODER_STREAM_UNLOCK (vtdec);
status = VTDecompressionSessionDecodeFrame (vtdec->session, cm_sample_buffer,
input_flags, frame, NULL);
GST_VIDEO_DECODER_STREAM_LOCK (vtdec);
if (status != noErr) {
GST_VIDEO_DECODER_ERROR (vtdec, 1, STREAM, DECODE,
("Failed to decode frame"),
("VTDecompressionSessionDecodeFrame returned %d", (int) status), ret);
goto out;
}
GST_LOG_OBJECT (vtdec, "submitted input frame %d", decode_frame_number);
frame = NULL;
out:
if (cm_sample_buffer)
CFRelease (cm_sample_buffer);
return ret;
drop:
gst_video_decoder_release_frame (decoder, frame);
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 = gst_video_format_to_cvpixelformat (format);
g_return_val_if_fail (vtdec->session == NULL, FALSE);
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);
if (videoDecoderSpecification)
CFRelease (videoDecoderSpecification);
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);
if (cm_format == kCMVideoCodecType_HEVC)
gst_vtutil_dict_set_data (atoms, CFSTR ("hvcC"), map.data, map.size);
else
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 (extensions)
CFRelease (extensions);
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;
gboolean push_anyway = FALSE;
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) {
switch (status) {
case kVTVideoDecoderReferenceMissingErr:
/* ReferenceMissingErr is not critical, when it occurs the frame
* usually has the kVTDecodeInfo_FrameDropped flag set. Log only for debugging purposes. */
GST_DEBUG_OBJECT (vtdec, "ReferenceMissingErr when decoding frame %d",
frame->decode_frame_number);
break;
#ifndef HAVE_IOS
case codecBadDataErr: /* SW decoder on macOS uses a different code from the hardware one... */
#endif
case kVTVideoDecoderBadDataErr:
/* BadDataErr also shouldn't cause an error to be displayed immediately.
* Set the error flag so the output loop will log a warning
* and only error out if this happens too many times. */
GST_DEBUG_OBJECT (vtdec, "BadDataErr when decoding frame %d",
frame->decode_frame_number);
frame->flags |= VTDEC_FRAME_FLAG_ERROR;
break;
default:
GST_ERROR_OBJECT (vtdec, "Error decoding frame %d: %d",
frame->decode_frame_number, (int) status);
frame->flags |= VTDEC_FRAME_FLAG_ERROR;
break;
}
}
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 %d dropped by VideoToolbox (%p)",
frame->decode_frame_number, frame);
frame->flags |= VTDEC_FRAME_FLAG_DROP;
} else {
GST_DEBUG_OBJECT (vtdec, "Decoded frame is NULL");
frame->flags |= VTDEC_FRAME_FLAG_SKIP;
}
}
/* Limit the amount of frames in our output queue
* to avoid processing too many frames ahead.
* The DPB * 2 size limit is completely arbitrary. */
g_mutex_lock (&vtdec->queue_mutex);
/* If negotiate() gets called from the output loop (via finish_frame()),
* it can attempt to drain and call VTDecompressionSessionWaitForAsynchronousFrames,
* which will lock up if we decide to wait in this callback, creating a deadlock. */
push_anyway = vtdec->is_flushing || vtdec->is_draining;
while (!push_anyway
&& gst_vec_deque_get_length (vtdec->reorder_queue) >
vtdec->dbp_size * 2 + 1) {
g_cond_wait (&vtdec->queue_cond, &vtdec->queue_mutex);
push_anyway = vtdec->is_flushing || vtdec->is_draining;
}
gst_vec_deque_push_sorted (vtdec->reorder_queue, frame, sort_frames_by_pts,
NULL);
GST_LOG ("pushed frame %d, queue length %" G_GSIZE_FORMAT,
frame->decode_frame_number,
gst_vec_deque_get_length (vtdec->reorder_queue));
g_cond_signal (&vtdec->queue_cond);
g_mutex_unlock (&vtdec->queue_mutex);
}
static GstFlowReturn
gst_vtdec_drain_decoder (GstVideoDecoder * decoder, gboolean flush)
{
GstVtdec *vtdec = GST_VTDEC (decoder);
OSStatus vt_status;
GST_DEBUG_OBJECT (vtdec, "drain_decoder, flushing: %d", flush);
/* In case of EOS before the first buffer/caps */
if (vtdec->session == NULL)
return GST_FLOW_OK;
/* Only early-return here if we're draining (as that needs to output frames).
* Flushing doesn't care about errors from downstream. */
if (!flush && vtdec->downstream_ret != GST_FLOW_OK
&& vtdec->downstream_ret != GST_FLOW_FLUSHING) {
GST_WARNING_OBJECT (vtdec, "Output loop stopped with error (%s), leaving",
gst_flow_get_name (vtdec->downstream_ret));
return vtdec->downstream_ret;
}
g_mutex_lock (&vtdec->queue_mutex);
if (flush)
vtdec->is_flushing = TRUE;
else
vtdec->is_draining = TRUE;
g_cond_signal (&vtdec->queue_cond);
g_mutex_unlock (&vtdec->queue_mutex);
if (!gst_vtdec_ensure_output_loop (vtdec)) {
GST_ERROR_OBJECT (vtdec, "Output loop failed to resume");
return GST_FLOW_ERROR;
}
GST_VIDEO_DECODER_STREAM_UNLOCK (vtdec);
vt_status = VTDecompressionSessionWaitForAsynchronousFrames (vtdec->session);
if (vt_status != noErr) {
GST_WARNING_OBJECT (vtdec,
"VTDecompressionSessionWaitForAsynchronousFrames returned %d",
(int) vt_status);
}
gst_vtdec_pause_output_loop (vtdec);
GST_VIDEO_DECODER_STREAM_LOCK (vtdec);
/* Only reset the draining flag here,
* is_flushing will be reset in sink_event() */
if (vtdec->is_draining)
vtdec->is_draining = FALSE;
if (vtdec->downstream_ret == GST_FLOW_OK)
GST_DEBUG_OBJECT (vtdec, "buffer queue cleaned");
else
GST_DEBUG_OBJECT (vtdec,
"buffer queue not cleaned, output thread returned %s",
gst_flow_get_name (vtdec->downstream_ret));
return vtdec->downstream_ret;
}
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_dpb_size (GstVtdec * vtdec,
CMVideoCodecType cm_format, GstBuffer * codec_data)
{
if (cm_format == kCMVideoCodecType_H264) {
if (!compute_h264_decode_picture_buffer_size (vtdec, codec_data,
&vtdec->dbp_size)) {
return FALSE;
}
} else if (cm_format == kCMVideoCodecType_HEVC) {
if (!compute_hevc_decode_picture_buffer_size (vtdec, codec_data,
&vtdec->dbp_size)) {
return FALSE;
}
} else {
vtdec->dbp_size = 0;
}
GST_DEBUG_OBJECT (vtdec, "Calculated DPB size: %d", vtdec->dbp_size);
return TRUE;
}
static gboolean
parse_h264_decoder_config_record (GstVtdec * vtdec, GstBuffer * codec_data,
GstH264DecoderConfigRecord ** config)
{
GstH264NalParser *parser = gst_h264_nal_parser_new ();
GstMapInfo map;
gboolean ret = TRUE;
gst_buffer_map (codec_data, &map, GST_MAP_READ);
if (gst_h264_parser_parse_decoder_config_record (parser, map.data, map.size,
config) != GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (vtdec, "Failed to parse codec-data");
ret = FALSE;
}
gst_h264_nal_parser_free (parser);
gst_buffer_unmap (codec_data, &map);
return ret;
}
static gboolean
get_h264_dpb_size_from_sps (GstVtdec * vtdec, GstH264NalUnit * nalu,
gint * dpb_size)
{
GstH264ParserResult result;
GstH264SPS sps;
gint width_mb, height_mb;
gint max_dpb_frames, max_dpb_size, max_dpb_mbs;
result = gst_h264_parse_sps (nalu, &sps);
if (result != GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (vtdec, "Failed to parse SPS, result %d", result);
return FALSE;
}
max_dpb_mbs = get_dpb_max_mb_s_from_level (vtdec, sps.level_idc);
if (max_dpb_mbs == -1) {
GST_ELEMENT_ERROR (vtdec, STREAM, DECODE, (NULL),
("invalid level found in SPS, could not compute max_dpb_mbs"));
gst_h264_sps_clear (&sps);
return FALSE;
}
/* This formula is specified in sections A.3.1.h and A.3.2.f of the 2009
* edition of the standard */
width_mb = sps.width / 16;
height_mb = sps.height / 16;
max_dpb_frames = MIN (max_dpb_mbs / (width_mb * height_mb),
GST_VTDEC_DPB_MAX_SIZE);
if (sps.vui_parameters_present_flag
&& sps.vui_parameters.bitstream_restriction_flag)
max_dpb_frames = MAX (1, sps.vui_parameters.max_dec_frame_buffering);
/* Some non-conforming H264 streams may request a number of frames
* larger than the calculated limit.
* See https://chromium-review.googlesource.com/c/chromium/src/+/760276/
*/
max_dpb_size = MAX (max_dpb_frames, sps.num_ref_frames);
if (max_dpb_size > GST_VTDEC_DPB_MAX_SIZE) {
GST_WARNING_OBJECT (vtdec, "Too large calculated DPB size %d",
max_dpb_size);
max_dpb_size = GST_VTDEC_DPB_MAX_SIZE;
}
*dpb_size = max_dpb_size;
gst_h264_sps_clear (&sps);
return TRUE;
}
static gboolean
compute_h264_decode_picture_buffer_size (GstVtdec * vtdec,
GstBuffer * codec_data, gint * length)
{
GstH264DecoderConfigRecord *config = NULL;
GstH264NalUnit *nalu;
guint8 profile, level;
gboolean ret = TRUE;
gint new_length;
guint i;
*length = 0;
if (vtdec->video_info.width == 0 || vtdec->video_info.height == 0)
return FALSE;
if (!parse_h264_decoder_config_record (vtdec, codec_data, &config))
return FALSE;
profile = config->profile_indication;
level = config->level_indication;
GST_INFO_OBJECT (vtdec, "parsed profile %d, level %d", profile, level);
if (profile == 66) {
/* baseline or constrained-baseline, we don't need to reorder */
goto out;
}
for (i = 0; i < config->sps->len; i++) {
nalu = &g_array_index (config->sps, GstH264NalUnit, i);
if (nalu->type != GST_H264_NAL_SPS)
continue;
if (!get_h264_dpb_size_from_sps (vtdec, nalu, &new_length))
GST_WARNING_OBJECT (vtdec, "Failed to get DPB size from SPS");
else
*length = MAX (*length, new_length);
}
out:
gst_h264_decoder_config_record_free (config);
return ret;
}
static gboolean
compute_hevc_decode_picture_buffer_size (GstVtdec * vtdec,
GstBuffer * codec_data, int *length)
{
/* This value should be level dependent (table A.8)
* but let's assume the maximum possible one for simplicity. */
const gint max_luma_ps = 35651584;
const gint max_dpb_pic_buf = 6;
gint max_dbp_size, pic_size_samples_y;
if (vtdec->video_info.width == 0 || vtdec->video_info.height == 0)
return FALSE;
/* A.4.2 */
pic_size_samples_y = vtdec->video_info.width * vtdec->video_info.height;
if (pic_size_samples_y <= (max_luma_ps >> 2))
max_dbp_size = max_dpb_pic_buf * 4;
else if (pic_size_samples_y <= (max_luma_ps >> 1))
max_dbp_size = max_dpb_pic_buf * 2;
else if (pic_size_samples_y <= ((3 * max_luma_ps) >> 2))
max_dbp_size = (max_dpb_pic_buf * 4) / 3;
else
max_dbp_size = max_dpb_pic_buf;
*length = MIN (max_dbp_size, 16);
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->dbp_size;
GST_INFO_OBJECT (vtdec, "setting latency frames:%d time:%" GST_TIME_FORMAT,
vtdec->dbp_size, 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);
#if defined (APPLEMEDIA_MOLTENVK)
gst_vulkan_handle_set_context (element, context, NULL, &vtdec->instance);
#endif
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/Hardware",
"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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