gstreamer/sys/applemedia/vtdec.c

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/*
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* Copyright (C) 2010, 2013 Ole André Vadla Ravnås <oleavr@soundrop.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.
*/
#include "vtdec.h"
#include "corevideobuffer.h"
#include "vtutil.h"
GST_DEBUG_CATEGORY (gst_vtdec_debug);
#define GST_CAT_DEFAULT (gst_vtdec_debug)
#define GST_VTDEC_CODEC_DETAILS_QDATA \
g_quark_from_static_string ("vtdec-codec-details")
static GstElementClass *parent_class = NULL;
static GstStateChangeReturn gst_vtdec_change_state (GstElement * element,
GstStateChange transition);
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static gboolean gst_vtdec_sink_setcaps (GstVTDec * dec, GstCaps * caps);
static GstFlowReturn gst_vtdec_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static CMFormatDescriptionRef gst_vtdec_create_format_description
(GstVTDec * self);
static CMFormatDescriptionRef
gst_vtdec_create_format_description_from_codec_data (GstVTDec * self,
GstBuffer * codec_data);
static VTDecompressionSessionRef gst_vtdec_create_session (GstVTDec * self,
CMFormatDescriptionRef fmt_desc);
static void gst_vtdec_destroy_session (GstVTDec * self,
VTDecompressionSessionRef * session);
static GstFlowReturn gst_vtdec_decode_buffer (GstVTDec * self, GstBuffer * buf);
static void gst_vtdec_enqueue_frame (void *data, gsize unk1, VTStatus result,
gsize unk2, CVBufferRef cvbuf);
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static gboolean gst_vtdec_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static CMSampleBufferRef gst_vtdec_sample_buffer_from (GstVTDec * self,
GstBuffer * buf);
static void
gst_vtdec_base_init (GstVTDecClass * klass)
{
const GstVTDecoderDetails *codec_details =
GST_VTDEC_CLASS_GET_CODEC_DETAILS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
const int min_width = 1, max_width = G_MAXINT;
const int min_height = 1, max_height = G_MAXINT;
const int min_fps_n = 0, max_fps_n = G_MAXINT;
const int min_fps_d = 1, max_fps_d = 1;
GstPadTemplate *sink_template, *src_template;
GstCaps *sink_caps;
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gchar *longname, *description;
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longname = g_strdup_printf ("%s decoder", codec_details->name);
description = g_strdup_printf ("%s decoder", codec_details->name);
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gst_element_class_set_metadata (element_class, longname,
"Codec/Decoder/Video", description,
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"Ole André Vadla Ravnås <oleavr@soundrop.com>");
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g_free (longname);
g_free (description);
sink_caps = gst_caps_new_simple (codec_details->mimetype,
"width", GST_TYPE_INT_RANGE, min_width, max_width,
"height", GST_TYPE_INT_RANGE, min_height, max_height,
"framerate", GST_TYPE_FRACTION_RANGE,
min_fps_n, min_fps_d, max_fps_n, max_fps_d, NULL);
if (codec_details->format_id == kVTFormatH264) {
gst_structure_set (gst_caps_get_structure (sink_caps, 0),
"stream-format", G_TYPE_STRING, "avc", NULL);
}
sink_template = gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
sink_caps);
gst_element_class_add_pad_template (element_class, sink_template);
src_template = gst_pad_template_new ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
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gst_caps_new_simple ("video/x-raw",
"format", G_TYPE_STRING, "NV12",
"width", GST_TYPE_INT_RANGE, min_width, max_width,
"height", GST_TYPE_INT_RANGE, min_height, max_height,
"framerate", GST_TYPE_FRACTION_RANGE,
min_fps_n, min_fps_d, max_fps_n, max_fps_d, NULL));
gst_element_class_add_pad_template (element_class, src_template);
}
static void
gst_vtdec_class_init (GstVTDecClass * klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gstelement_class->change_state = gst_vtdec_change_state;
}
static void
gst_vtdec_init (GstVTDec * self)
{
GstVTDecClass *klass = (GstVTDecClass *) G_OBJECT_GET_CLASS (self);
GstElementClass *element_klass = GST_ELEMENT_CLASS (klass);
GstElement *element = GST_ELEMENT (self);
self->details = GST_VTDEC_CLASS_GET_CODEC_DETAILS (klass);
self->sinkpad = gst_pad_new_from_template
(gst_element_class_get_pad_template (element_klass, "sink"), "sink");
gst_element_add_pad (element, self->sinkpad);
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gst_pad_set_event_function (self->sinkpad, gst_vtdec_sink_event);
gst_pad_set_chain_function (self->sinkpad, gst_vtdec_chain);
self->srcpad = gst_pad_new_from_template
(gst_element_class_get_pad_template (element_klass, "src"), "src");
gst_element_add_pad (element, self->srcpad);
}
static GstStateChangeReturn
gst_vtdec_change_state (GstElement * element, GstStateChange transition)
{
GstVTDec *self = GST_VTDEC_CAST (element);
GError *error = NULL;
GstStateChangeReturn ret;
if (transition == GST_STATE_CHANGE_NULL_TO_READY) {
self->ctx = gst_core_media_ctx_new (GST_API_CORE_VIDEO | GST_API_CORE_MEDIA
| GST_API_VIDEO_TOOLBOX, &error);
if (error != NULL)
goto api_error;
self->cur_outbufs = g_ptr_array_new ();
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (transition == GST_STATE_CHANGE_READY_TO_NULL) {
gst_vtdec_destroy_session (self, &self->session);
self->ctx->cm->FigFormatDescriptionRelease (self->fmt_desc);
self->fmt_desc = NULL;
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gst_video_info_init (&self->vinfo);
g_ptr_array_free (self->cur_outbufs, TRUE);
self->cur_outbufs = NULL;
g_object_unref (self->ctx);
self->ctx = NULL;
}
return ret;
api_error:
{
GST_ELEMENT_ERROR (self, RESOURCE, FAILED, ("API error"),
("%s", error->message));
g_clear_error (&error);
return GST_STATE_CHANGE_FAILURE;
}
}
static gboolean
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gst_vtdec_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstVTDec *self = GST_VTDEC_CAST (parent);
gboolean forward = TRUE;
gboolean res = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
res = gst_vtdec_sink_setcaps (self, caps);
}
default:
break;
}
if (forward)
res = gst_pad_event_default (pad, parent, event);
return res;
}
static gboolean
gst_vtdec_sink_setcaps (GstVTDec * self, GstCaps * caps)
{
GstStructure *structure;
CMFormatDescriptionRef fmt_desc = NULL;
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GstVideoFormat format = GST_VIDEO_FORMAT_NV12;
gint width, height;
gint fps_n, fps_d;
gint par_n, par_d;
structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "width", &width))
goto incomplete_caps;
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if (!gst_structure_get_int (structure, "height", &height))
goto incomplete_caps;
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gst_video_info_init (&self->vinfo);
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gst_video_info_set_format (&self->vinfo, format, width, height);
if (gst_structure_get_fraction (structure, "framerate", &fps_n, &fps_d)) {
if (fps_n == 0) {
/* variable framerate */
self->vinfo.flags |= GST_VIDEO_FLAG_VARIABLE_FPS;
/* see if we have a max-framerate */
gst_structure_get_fraction (structure, "max-framerate", &fps_n, &fps_d);
}
self->vinfo.fps_n = fps_n;
self->vinfo.fps_d = fps_d;
} else {
/* unspecified is variable framerate */
self->vinfo.fps_n = 0;
self->vinfo.fps_d = 1;
}
if (gst_structure_get_fraction (structure, "pixel-aspect-ratio",
&par_n, &par_d)) {
self->vinfo.par_n = par_n;
self->vinfo.par_d = par_d;
} else {
self->vinfo.par_n = 1;
self->vinfo.par_d = 1;
}
if (self->details->format_id == kVTFormatH264) {
const GValue *codec_data_value;
codec_data_value = gst_structure_get_value (structure, "codec_data");
if (codec_data_value != NULL) {
fmt_desc = gst_vtdec_create_format_description_from_codec_data (self,
gst_value_get_buffer (codec_data_value));
} else {
GST_DEBUG_OBJECT (self, "no codec_data in caps, awaiting future setcaps");
}
} else {
fmt_desc = gst_vtdec_create_format_description (self);
}
if (fmt_desc != NULL) {
gst_vtdec_destroy_session (self, &self->session);
self->ctx->cm->FigFormatDescriptionRelease (self->fmt_desc);
self->fmt_desc = fmt_desc;
self->session = gst_vtdec_create_session (self, fmt_desc);
if (self->session == NULL)
goto session_create_error;
}
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/* renegotiate when upstream caps change */
gst_pad_mark_reconfigure (self->srcpad);
return TRUE;
/* ERRORS */
incomplete_caps:
{
return TRUE;
}
session_create_error:
{
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
("failed to create session"), (NULL));
return FALSE;
}
}
static gboolean
gst_vtdec_is_negotiated (GstVTDec * self)
{
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return self->vinfo.width != 0;
}
static gboolean
gst_vtdec_negotiate_downstream (GstVTDec * self)
{
gboolean result;
GstCaps *caps;
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if (!gst_pad_check_reconfigure (self->srcpad))
return TRUE;
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caps = gst_video_info_to_caps (&self->vinfo);
result = gst_pad_push_event (self->srcpad, gst_event_new_caps (caps));
gst_caps_unref (caps);
return result;
}
static GstFlowReturn
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gst_vtdec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
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GstVTDec *self = GST_VTDEC_CAST (parent);
if (!gst_vtdec_is_negotiated (self))
goto not_negotiated;
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if (self->session == NULL)
goto pending_caps;
return gst_vtdec_decode_buffer (self, buf);
not_negotiated:
GST_DEBUG_OBJECT (self, "chain called while not negotiated");
gst_buffer_unref (buf);
return GST_FLOW_NOT_NEGOTIATED;
pending_caps:
gst_buffer_unref (buf);
GST_DEBUG_OBJECT (self, "dropped buffer %p (waiting for complete caps)", buf);
return GST_FLOW_OK;
}
static CMFormatDescriptionRef
gst_vtdec_create_format_description (GstVTDec * self)
{
CMFormatDescriptionRef fmt_desc;
OSStatus status;
status = self->ctx->cm->CMVideoFormatDescriptionCreate (NULL,
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self->details->format_id, self->vinfo.width, self->vinfo.height,
NULL, &fmt_desc);
if (status == noErr)
return fmt_desc;
else
return NULL;
}
static CMFormatDescriptionRef
gst_vtdec_create_format_description_from_codec_data (GstVTDec * self,
GstBuffer * codec_data)
{
CMFormatDescriptionRef fmt_desc;
OSStatus status;
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GstMapInfo map;
gst_buffer_map (codec_data, &map, GST_MAP_READ);
status =
self->ctx->cm->
FigVideoFormatDescriptionCreateWithSampleDescriptionExtensionAtom (NULL,
self->details->format_id, self->vinfo.width, self->vinfo.height, 'avcC',
map.data, map.size, NULL, &fmt_desc);
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gst_buffer_unmap (codec_data, &map);
if (status == noErr)
return fmt_desc;
else
return NULL;
}
static VTDecompressionSessionRef
gst_vtdec_create_session (GstVTDec * self, CMFormatDescriptionRef fmt_desc)
{
VTDecompressionSessionRef session = NULL;
GstCVApi *cv = self->ctx->cv;
CFMutableDictionaryRef pb_attrs;
VTDecompressionOutputCallback callback;
VTStatus status;
pb_attrs = CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
gst_vtutil_dict_set_i32 (pb_attrs, *(cv->kCVPixelBufferPixelFormatTypeKey),
kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange);
gst_vtutil_dict_set_i32 (pb_attrs, *(cv->kCVPixelBufferWidthKey),
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self->vinfo.width);
gst_vtutil_dict_set_i32 (pb_attrs, *(cv->kCVPixelBufferHeightKey),
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self->vinfo.height);
gst_vtutil_dict_set_i32 (pb_attrs,
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*(cv->kCVPixelBufferBytesPerRowAlignmentKey), 2 * self->vinfo.width);
callback.func = gst_vtdec_enqueue_frame;
callback.data = self;
status = self->ctx->vt->VTDecompressionSessionCreate (NULL, fmt_desc,
NULL, pb_attrs, &callback, &session);
GST_INFO_OBJECT (self, "VTDecompressionSessionCreate for %d x %d => %d",
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self->vinfo.width, self->vinfo.height, status);
CFRelease (pb_attrs);
return session;
}
static void
gst_vtdec_destroy_session (GstVTDec * self, VTDecompressionSessionRef * session)
{
self->ctx->vt->VTDecompressionSessionInvalidate (*session);
if (*session != NULL) {
CFRelease (*session);
*session = NULL;
}
}
static GstFlowReturn
gst_vtdec_decode_buffer (GstVTDec * self, GstBuffer * buf)
{
GstVTApi *vt = self->ctx->vt;
CMSampleBufferRef sbuf;
VTStatus status;
GstFlowReturn ret = GST_FLOW_OK;
guint i;
self->cur_inbuf = buf;
sbuf = gst_vtdec_sample_buffer_from (self, buf);
status = vt->VTDecompressionSessionDecodeFrame (self->session, sbuf, 0, 0, 0);
if (status != 0) {
GST_WARNING_OBJECT (self, "VTDecompressionSessionDecodeFrame returned %d",
status);
}
status = vt->VTDecompressionSessionWaitForAsynchronousFrames (self->session);
if (status != 0) {
GST_WARNING_OBJECT (self,
"VTDecompressionSessionWaitForAsynchronousFrames returned %d", status);
}
self->ctx->cm->FigSampleBufferRelease (sbuf);
self->cur_inbuf = NULL;
gst_buffer_unref (buf);
if (self->cur_outbufs->len > 0) {
if (!gst_vtdec_negotiate_downstream (self))
ret = GST_FLOW_NOT_NEGOTIATED;
}
for (i = 0; i != self->cur_outbufs->len; i++) {
GstBuffer *buf = g_ptr_array_index (self->cur_outbufs, i);
if (ret == GST_FLOW_OK) {
ret = gst_pad_push (self->srcpad, buf);
} else {
gst_buffer_unref (buf);
}
}
g_ptr_array_set_size (self->cur_outbufs, 0);
return ret;
}
static void
gst_vtdec_enqueue_frame (void *data, gsize unk1, VTStatus result, gsize unk2,
CVBufferRef cvbuf)
{
GstVTDec *self = GST_VTDEC_CAST (data);
GstBuffer *buf;
if (result != kVTSuccess)
goto beach;
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buf = gst_core_video_buffer_new (self->ctx, cvbuf, &self->vinfo);
gst_buffer_copy_into (buf, self->cur_inbuf, GST_BUFFER_COPY_METADATA, 0, -1);
g_ptr_array_add (self->cur_outbufs, buf);
beach:
return;
}
static CMSampleBufferRef
gst_vtdec_sample_buffer_from (GstVTDec * self, GstBuffer * buf)
{
GstCMApi *cm = self->ctx->cm;
OSStatus status;
CMBlockBufferRef bbuf = NULL;
CMSampleBufferRef sbuf = NULL;
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GstMapInfo map;
g_assert (self->fmt_desc != NULL);
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gst_buffer_map (buf, &map, GST_MAP_READ);
status = cm->CMBlockBufferCreateWithMemoryBlock (NULL,
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map.data, (gint64) map.size, kCFAllocatorNull, NULL, 0, (gint64) map.size,
FALSE, &bbuf);
gst_buffer_unmap (buf, &map);
if (status != noErr)
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goto error;
status = cm->CMSampleBufferCreate (NULL, bbuf, TRUE, 0, 0, self->fmt_desc,
1, 0, NULL, 0, NULL, &sbuf);
if (status != noErr)
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goto error;
beach:
cm->FigBlockBufferRelease (bbuf);
return sbuf;
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error:
GST_ERROR_OBJECT (self, "err %d", status);
goto beach;
}
static void
gst_vtdec_register (GstPlugin * plugin,
const GstVTDecoderDetails * codec_details)
{
GTypeInfo type_info = {
sizeof (GstVTDecClass),
(GBaseInitFunc) gst_vtdec_base_init,
NULL,
(GClassInitFunc) gst_vtdec_class_init,
NULL,
NULL,
sizeof (GstVTDecClass),
0,
(GInstanceInitFunc) gst_vtdec_init,
};
gchar *type_name;
GType type;
gboolean result;
type_name = g_strdup_printf ("vtdec_%s", codec_details->element_name);
type = g_type_register_static (GST_TYPE_ELEMENT, type_name, &type_info, 0);
g_type_set_qdata (type, GST_VTDEC_CODEC_DETAILS_QDATA,
(gpointer) codec_details);
result = gst_element_register (plugin, type_name, GST_RANK_NONE, type);
if (!result) {
GST_ERROR_OBJECT (plugin, "failed to register element %s", type_name);
}
g_free (type_name);
}
static const GstVTDecoderDetails gst_vtdec_codecs[] = {
{"H.264", "h264", "video/x-h264", kVTFormatH264},
{"JPEG", "jpeg", "image/jpeg", kVTFormatJPEG}
};
void
gst_vtdec_register_elements (GstPlugin * plugin)
{
guint i;
GST_DEBUG_CATEGORY_INIT (gst_vtdec_debug, "vtdec",
0, "Apple VideoToolbox Decoder Wrapper");
for (i = 0; i != G_N_ELEMENTS (gst_vtdec_codecs); i++)
gst_vtdec_register (plugin, &gst_vtdec_codecs[i]);
}