gstreamer/gst/videoparsers/gstvp9parse.c

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/* GStreamer
* Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/codecparsers/gstvp9parser.h>
#include <gst/video/video.h>
#include "gstvideoparserselements.h"
#include "gstvp9parse.h"
#include <string.h>
GST_DEBUG_CATEGORY (vp9_parse_debug);
#define GST_CAT_DEFAULT vp9_parse_debug
typedef enum
{
GST_VP9_PARSE_ALIGN_NONE = 0,
GST_VP9_PARSE_ALIGN_SUPER_FRAME,
GST_VP9_PARSE_ALIGN_FRAME,
} GstVp9ParseAligment;
struct _GstVp9Parse
{
GstBaseParse parent;
/* parsed from the last keyframe */
gint width;
gint height;
gint subsampling_x;
gint subsampling_y;
GstVp9ColorSpace color_space;
GstVp9ColorRange color_range;
GstVP9Profile profile;
GstVp9BitDepth bit_depth;
GstVp9ParseAligment in_align;
GstVp9ParseAligment align;
GstVp9Parser *parser;
gboolean update_caps;
/* per frame status */
gboolean discont;
};
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vp9"));
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vp9, parsed = (boolean) true, "
"alignment=(string) { super-frame, frame }"));
#define parent_class gst_vp9_parse_parent_class
G_DEFINE_TYPE (GstVp9Parse, gst_vp9_parse, GST_TYPE_BASE_PARSE);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (vp9parse, "vp9parse", GST_RANK_SECONDARY,
GST_TYPE_VP9_PARSE, videoparsers_element_init (plugin));
static gboolean gst_vp9_parse_start (GstBaseParse * parse);
static gboolean gst_vp9_parse_stop (GstBaseParse * parse);
static GstFlowReturn gst_vp9_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize);
static gboolean gst_vp9_parse_set_sink_caps (GstBaseParse * parse,
GstCaps * caps);
static GstCaps *gst_vp9_parse_get_sink_caps (GstBaseParse * parse,
GstCaps * filter);
static void gst_vp9_parse_update_src_caps (GstVp9Parse * self, GstCaps * caps);
static GstFlowReturn gst_vp9_parse_parse_frame (GstVp9Parse * self,
GstBaseParseFrame * frame, GstVp9FrameHdr * frame_hdr);
static void
gst_vp9_parse_class_init (GstVp9ParseClass * klass)
{
GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
parse_class->start = GST_DEBUG_FUNCPTR (gst_vp9_parse_start);
parse_class->stop = GST_DEBUG_FUNCPTR (gst_vp9_parse_stop);
parse_class->handle_frame = GST_DEBUG_FUNCPTR (gst_vp9_parse_handle_frame);
parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_vp9_parse_set_sink_caps);
parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_vp9_parse_get_sink_caps);
gst_element_class_add_static_pad_template (element_class, &srctemplate);
gst_element_class_add_static_pad_template (element_class, &sinktemplate);
gst_element_class_set_static_metadata (element_class, "VP9 parser",
"Codec/Parser/Converter/Video",
"Parses VP9 streams", "Seungha Yang <seungha@centricular.com>");
GST_DEBUG_CATEGORY_INIT (vp9_parse_debug, "vp9parse", 0, "vp9 parser");
}
static void
gst_vp9_parse_init (GstVp9Parse * self)
{
gst_base_parse_set_pts_interpolation (GST_BASE_PARSE (self), FALSE);
gst_base_parse_set_infer_ts (GST_BASE_PARSE (self), FALSE);
GST_PAD_SET_ACCEPT_INTERSECT (GST_BASE_PARSE_SINK_PAD (self));
GST_PAD_SET_ACCEPT_TEMPLATE (GST_BASE_PARSE_SINK_PAD (self));
}
static void
gst_vp9_parse_reset (GstVp9Parse * self)
{
self->width = 0;
self->height = 0;
self->subsampling_x = -1;
self->subsampling_y = -1;
self->color_space = GST_VP9_CS_UNKNOWN;
self->color_range = GST_VP9_CR_LIMITED;
self->profile = GST_VP9_PROFILE_UNDEFINED;
self->bit_depth = (GstVp9BitDepth) 0;
}
static gboolean
gst_vp9_parse_start (GstBaseParse * parse)
{
GstVp9Parse *self = GST_VP9_PARSE (parse);
GST_DEBUG_OBJECT (self, "start");
self->parser = gst_vp9_parser_new ();
gst_vp9_parse_reset (self);
/* short frame header with one byte */
gst_base_parse_set_min_frame_size (parse, 1);
return TRUE;
}
static gboolean
gst_vp9_parse_stop (GstBaseParse * parse)
{
GstVp9Parse *self = GST_VP9_PARSE (parse);
GST_DEBUG_OBJECT (self, "stop");
g_clear_pointer (&self->parser, gst_vp9_parser_free);
return TRUE;
}
static const gchar *
gst_vp9_parse_profile_to_string (GstVP9Profile profile)
{
switch (profile) {
case GST_VP9_PROFILE_0:
return "0";
case GST_VP9_PROFILE_1:
return "1";
case GST_VP9_PROFILE_2:
return "2";
case GST_VP9_PROFILE_3:
return "3";
default:
break;
}
return NULL;
}
static GstVP9Profile
gst_vp9_parse_profile_from_string (const gchar * profile)
{
if (!profile)
return GST_VP9_PROFILE_UNDEFINED;
if (g_strcmp0 (profile, "0") == 0)
return GST_VP9_PROFILE_0;
else if (g_strcmp0 (profile, "1") == 0)
return GST_VP9_PROFILE_1;
else if (g_strcmp0 (profile, "2") == 0)
return GST_VP9_PROFILE_2;
else if (g_strcmp0 (profile, "3") == 0)
return GST_VP9_PROFILE_3;
return GST_VP9_PROFILE_UNDEFINED;
}
static const gchar *
gst_vp9_parse_alignment_to_string (GstVp9ParseAligment align)
{
switch (align) {
case GST_VP9_PARSE_ALIGN_SUPER_FRAME:
return "super-frame";
case GST_VP9_PARSE_ALIGN_FRAME:
return "frame";
default:
break;
}
return NULL;
}
static GstVp9ParseAligment
gst_vp9_parse_alignment_from_string (const gchar * align)
{
if (!align)
return GST_VP9_PARSE_ALIGN_NONE;
if (g_strcmp0 (align, "super-frame") == 0)
return GST_VP9_PARSE_ALIGN_SUPER_FRAME;
else if (g_strcmp0 (align, "frame") == 0)
return GST_VP9_PARSE_ALIGN_FRAME;
return GST_VP9_PARSE_ALIGN_NONE;
}
static void
gst_vp9_parse_alignment_from_caps (GstCaps * caps, GstVp9ParseAligment * align)
{
*align = GST_VP9_PARSE_ALIGN_NONE;
GST_DEBUG ("parsing caps: %" GST_PTR_FORMAT, caps);
if (caps && gst_caps_get_size (caps) > 0) {
GstStructure *s = gst_caps_get_structure (caps, 0);
const gchar *str = NULL;
if ((str = gst_structure_get_string (s, "alignment"))) {
*align = gst_vp9_parse_alignment_from_string (str);
}
}
}
/* check downstream caps to configure format and alignment */
static void
gst_vp9_parse_negotiate (GstVp9Parse * self, GstVp9ParseAligment in_align,
GstCaps * in_caps)
{
GstCaps *caps;
GstVp9ParseAligment align = self->align;
caps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (self));
GST_DEBUG_OBJECT (self, "allowed caps: %" GST_PTR_FORMAT, caps);
/* concentrate on leading structure, since decodebin parser
* capsfilter always includes parser template caps */
if (caps) {
caps = gst_caps_truncate (caps);
GST_DEBUG_OBJECT (self, "negotiating with caps: %" GST_PTR_FORMAT, caps);
}
if (in_caps && caps) {
if (gst_caps_can_intersect (in_caps, caps)) {
GST_DEBUG_OBJECT (self, "downstream accepts upstream caps");
gst_vp9_parse_alignment_from_caps (in_caps, &align);
gst_clear_caps (&caps);
}
}
/* FIXME We could fail the negotiation immediately if caps are empty */
if (caps && !gst_caps_is_empty (caps)) {
/* fixate to avoid ambiguity with lists when parsing */
caps = gst_caps_fixate (caps);
gst_vp9_parse_alignment_from_caps (caps, &align);
}
/* default */
if (align == GST_VP9_PARSE_ALIGN_NONE)
align = GST_VP9_PARSE_ALIGN_SUPER_FRAME;
GST_DEBUG_OBJECT (self, "selected alignment %s",
gst_vp9_parse_alignment_to_string (align));
self->align = align;
gst_clear_caps (&caps);
}
static gboolean
gst_vp9_parse_process_frame (GstVp9Parse * self, GstVp9FrameHdr * frame_hdr)
{
GstVp9Parser *parser = self->parser;
gint width, height;
/* the resolution might be varying. Update our status per key frame */
if (frame_hdr->frame_type != GST_VP9_KEY_FRAME ||
frame_hdr->show_existing_frame) {
return TRUE;
}
width = frame_hdr->width;
height = frame_hdr->height;
if (frame_hdr->display_size_enabled &&
frame_hdr->display_width > 0 && frame_hdr->display_height) {
width = frame_hdr->display_width;
height = frame_hdr->display_height;
}
if (width != self->width || height != self->height) {
GST_DEBUG_OBJECT (self, "resolution change from %dx%d to %dx%d",
self->width, self->height, width, height);
self->width = width;
self->height = height;
self->update_caps = TRUE;
}
if (self->subsampling_x != parser->subsampling_x ||
self->subsampling_y != parser->subsampling_y) {
GST_DEBUG_OBJECT (self,
"subsampling changed from x: %d, y: %d to x: %d, y: %d",
self->subsampling_x, self->subsampling_y,
parser->subsampling_x, parser->subsampling_y);
self->subsampling_x = parser->subsampling_x;
self->subsampling_y = parser->subsampling_y;
self->update_caps = TRUE;
}
if (parser->color_space != GST_VP9_CS_UNKNOWN &&
parser->color_space != GST_VP9_CS_RESERVED_2 &&
parser->color_space != self->color_space) {
GST_DEBUG_OBJECT (self, "colorspace changed from %d to %d",
self->color_space, parser->color_space);
self->color_space = parser->color_space;
self->update_caps = TRUE;
}
if (parser->color_range != self->color_range) {
GST_DEBUG_OBJECT (self, "color range changed from %d to %d",
self->color_range, parser->color_range);
self->color_range = parser->color_range;
self->update_caps = TRUE;
}
if (frame_hdr->profile != GST_VP9_PROFILE_UNDEFINED &&
frame_hdr->profile != self->profile) {
GST_DEBUG_OBJECT (self, "profile changed from %d to %d", self->profile,
frame_hdr->profile);
self->profile = frame_hdr->profile;
self->update_caps = TRUE;
}
if (parser->bit_depth != self->bit_depth) {
GST_DEBUG_OBJECT (self, "bit-depth changed from %d to %d",
self->bit_depth, parser->bit_depth);
self->bit_depth = parser->bit_depth;
self->update_caps = TRUE;
}
return TRUE;
}
static GstFlowReturn
gst_vp9_parse_handle_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
gint * skipsize)
{
GstVp9Parse *self = GST_VP9_PARSE (parse);
GstBuffer *buffer = frame->buffer;
GstFlowReturn ret = GST_FLOW_OK;
GstVp9ParserResult parse_res = GST_VP9_PARSER_ERROR;
GstMapInfo map;
gsize offset = 0;
GstVp9SuperframeInfo superframe_info;
guint i;
GstVp9FrameHdr frame_hdr;
if (GST_BUFFER_FLAG_IS_SET (frame->buffer, GST_BUFFER_FLAG_DISCONT))
self->discont = TRUE;
else
self->discont = FALSE;
/* need to save buffer from invalidation upon _finish_frame */
if (self->align == GST_VP9_PARSE_ALIGN_FRAME)
buffer = gst_buffer_copy (frame->buffer);
if (!gst_buffer_map (buffer, &map, GST_MAP_READ)) {
GST_ELEMENT_ERROR (parse, CORE, NOT_IMPLEMENTED, (NULL),
("Couldn't map incoming buffer"));
return GST_FLOW_ERROR;
}
GST_TRACE_OBJECT (self, "processing buffer of size %" G_GSIZE_FORMAT,
map.size);
/* superframe_info will be zero initialized by GstVp9Parser */
parse_res = gst_vp9_parser_parse_superframe_info (self->parser,
&superframe_info, map.data, map.size);
if (parse_res != GST_VP9_PARSER_OK) {
/* just finish this frame anyway, so that we don't too strict
* regarding parsing vp9 stream.
* Downstream might be able to handle this stream even though
* it's very unlikely */
GST_WARNING_OBJECT (self, "Couldn't parse superframe res: %d", parse_res);
goto done;
}
for (i = 0; i < superframe_info.frames_in_superframe; i++) {
guint32 frame_size;
frame_size = superframe_info.frame_sizes[i];
parse_res = gst_vp9_parser_parse_frame_header (self->parser,
&frame_hdr, map.data + offset, frame_size);
if (parse_res != GST_VP9_PARSER_OK) {
GST_WARNING_OBJECT (self, "Parsing error %d", parse_res);
break;
}
gst_vp9_parse_process_frame (self, &frame_hdr);
if (self->align == GST_VP9_PARSE_ALIGN_FRAME) {
GstBaseParseFrame subframe;
gst_base_parse_frame_init (&subframe);
subframe.flags |= frame->flags;
subframe.offset = frame->offset;
subframe.overhead = frame->overhead;
subframe.buffer = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL,
offset, frame_size);
/* note we don't need to come up with a sub-buffer, since
* subsequent code only considers input buffer's metadata.
* Real data is either taken from input by baseclass or
* a replacement output buffer is provided anyway. */
gst_vp9_parse_parse_frame (self, &subframe, &frame_hdr);
ret = gst_base_parse_finish_frame (parse, &subframe, frame_size);
} else {
/* FIXME: need to parse all frames belong to this superframe? */
break;
}
offset += frame_size;
}
done:
gst_buffer_unmap (buffer, &map);
if (self->align != GST_VP9_PARSE_ALIGN_FRAME) {
if (parse_res == GST_VP9_PARSER_OK)
gst_vp9_parse_parse_frame (self, frame, &frame_hdr);
ret = gst_base_parse_finish_frame (parse, frame, map.size);
} else {
gst_buffer_unref (buffer);
if (offset != map.size) {
gsize left = map.size - offset;
if (left != superframe_info.superframe_index_size) {
GST_WARNING_OBJECT (parse,
"Skipping leftover frame data %" G_GSIZE_FORMAT, left);
}
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_DROP;
ret = gst_base_parse_finish_frame (parse, frame, left);
}
}
return ret;
}
static void
gst_vp9_parse_update_src_caps (GstVp9Parse * self, GstCaps * caps)
{
GstCaps *sink_caps, *src_caps;
GstCaps *final_caps = NULL;
GstStructure *s = NULL;
gint width, height;
gint par_n = 0, par_d = 0;
gint fps_n = 0, fps_d = 0;
gint bitdepth = 0;
gchar *colorimetry = NULL;
const gchar *chroma_format = NULL;
const gchar *profile = NULL;
gboolean codec_alpha_allowed = FALSE;
if (!self->update_caps)
return;
/* if this is being called from the first _setcaps call, caps on the sinkpad
* aren't set yet and so they need to be passed as an argument */
if (caps)
sink_caps = gst_caps_ref (caps);
else
sink_caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (self));
/* carry over input caps as much as possible; override with our own stuff */
if (!sink_caps)
sink_caps = gst_caps_new_empty_simple ("video/x-vp9");
else
s = gst_caps_get_structure (sink_caps, 0);
final_caps = gst_caps_copy (sink_caps);
/* frame header should give this but upstream overrides */
if (s && gst_structure_has_field (s, "width") &&
gst_structure_has_field (s, "height")) {
gst_structure_get_int (s, "width", &width);
gst_structure_get_int (s, "height", &height);
} else {
width = self->width;
height = self->height;
}
if (width > 0 && height > 0)
gst_caps_set_simple (final_caps, "width", G_TYPE_INT, width,
"height", G_TYPE_INT, height, NULL);
if (s && gst_structure_get_fraction (s, "pixel-aspect-ratio", &par_n, &par_d)) {
if (par_n != 0 && par_d != 0) {
gst_caps_set_simple (final_caps, "pixel-aspect-ratio",
GST_TYPE_FRACTION, par_n, par_d, NULL);
}
}
if (s && gst_structure_has_field (s, "framerate")) {
gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
}
if (s && gst_structure_has_field (s, "codec-alpha")) {
gst_structure_get_boolean (s, "codec-alpha", &codec_alpha_allowed);
}
if (fps_n > 0 && fps_d > 0) {
gst_caps_set_simple (final_caps, "framerate",
GST_TYPE_FRACTION, fps_n, fps_d, NULL);
gst_base_parse_set_frame_rate (GST_BASE_PARSE (self), fps_n, fps_d, 0, 0);
}
if (self->color_space != GST_VP9_CS_UNKNOWN &&
self->color_space != GST_VP9_CS_RESERVED_2) {
GstVideoColorimetry cinfo;
gboolean have_cinfo = TRUE;
memset (&cinfo, 0, sizeof (GstVideoColorimetry));
switch (self->parser->color_space) {
case GST_VP9_CS_BT_601:
gst_video_colorimetry_from_string (&cinfo, GST_VIDEO_COLORIMETRY_BT601);
break;
case GST_VP9_CS_BT_709:
gst_video_colorimetry_from_string (&cinfo, GST_VIDEO_COLORIMETRY_BT709);
break;
case GST_VP9_CS_SMPTE_170:
gst_video_colorimetry_from_string (&cinfo, GST_VIDEO_COLORIMETRY_BT601);
break;
case GST_VP9_CS_SMPTE_240:
gst_video_colorimetry_from_string (&cinfo,
GST_VIDEO_COLORIMETRY_SMPTE240M);
break;
case GST_VP9_CS_BT_2020:
if (self->parser->bit_depth == GST_VP9_BIT_DEPTH_12) {
gst_video_colorimetry_from_string (&cinfo,
GST_VIDEO_COLORIMETRY_BT2020);
} else {
gst_video_colorimetry_from_string (&cinfo,
GST_VIDEO_COLORIMETRY_BT2020_10);
}
break;
case GST_VP9_CS_SRGB:
gst_video_colorimetry_from_string (&cinfo, GST_VIDEO_COLORIMETRY_SRGB);
break;
default:
have_cinfo = FALSE;
break;
}
if (have_cinfo) {
if (self->parser->color_range == GST_VP9_CR_LIMITED)
cinfo.range = GST_VIDEO_COLOR_RANGE_16_235;
else
cinfo.range = GST_VIDEO_COLOR_RANGE_0_255;
colorimetry = gst_video_colorimetry_to_string (&cinfo);
}
}
if (self->color_space != GST_VP9_CS_SRGB) {
if (self->parser->subsampling_x == 1 && self->parser->subsampling_y == 1)
chroma_format = "4:2:0";
else if (self->parser->subsampling_x == 1 &&
self->parser->subsampling_y == 0)
chroma_format = "4:2:2";
else if (self->parser->subsampling_x == 0 &&
self->parser->subsampling_y == 1)
chroma_format = "4:4:0";
else if (self->parser->subsampling_x == 0 &&
self->parser->subsampling_y == 0)
chroma_format = "4:4:4";
if (chroma_format)
gst_caps_set_simple (final_caps,
"chroma-format", G_TYPE_STRING, chroma_format, NULL);
}
switch (self->bit_depth) {
case GST_VP9_BIT_DEPTH_8:
bitdepth = 8;
break;
case GST_VP9_BIT_DEPTH_10:
bitdepth = 10;
break;
case GST_VP9_BIT_DEPTH_12:
bitdepth = 12;
break;
default:
break;
}
if (bitdepth) {
gst_caps_set_simple (final_caps,
"bit-depth-luma", G_TYPE_UINT, bitdepth,
"bit-depth-chroma", G_TYPE_UINT, bitdepth, NULL);
}
if (colorimetry && (!s || !gst_structure_has_field (s, "colorimetry"))) {
gst_caps_set_simple (final_caps,
"colorimetry", G_TYPE_STRING, colorimetry, NULL);
}
g_free (colorimetry);
gst_caps_set_simple (final_caps, "parsed", G_TYPE_BOOLEAN, TRUE,
"alignment", G_TYPE_STRING,
gst_vp9_parse_alignment_to_string (self->align), NULL);
profile = gst_vp9_parse_profile_to_string (self->profile);
if (profile)
gst_caps_set_simple (final_caps, "profile", G_TYPE_STRING, profile, NULL);
gst_caps_set_simple (final_caps, "codec-alpha", G_TYPE_BOOLEAN,
codec_alpha_allowed, NULL);
src_caps = gst_pad_get_current_caps (GST_BASE_PARSE_SRC_PAD (self));
if (!(src_caps && gst_caps_is_strictly_equal (src_caps, final_caps))) {
GST_DEBUG_OBJECT (self, "Update src caps %" GST_PTR_FORMAT, final_caps);
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (self), final_caps);
}
gst_clear_caps (&src_caps);
gst_caps_unref (final_caps);
gst_caps_unref (sink_caps);
self->update_caps = FALSE;
}
static GstFlowReturn
gst_vp9_parse_parse_frame (GstVp9Parse * self, GstBaseParseFrame * frame,
GstVp9FrameHdr * frame_hdr)
{
GstBuffer *buffer;
buffer = frame->buffer;
gst_vp9_parse_update_src_caps (self, NULL);
if (frame_hdr->frame_type == GST_VP9_KEY_FRAME)
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
if (self->align == GST_VP9_PARSE_ALIGN_FRAME) {
if (!frame_hdr->show_frame)
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DECODE_ONLY);
else
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DECODE_ONLY);
}
if (self->discont) {
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
self->discont = FALSE;
}
return GST_FLOW_OK;
}
static gboolean
gst_vp9_parse_set_sink_caps (GstBaseParse * parse, GstCaps * caps)
{
GstVp9Parse *self = GST_VP9_PARSE (parse);
GstStructure *str;
GstVp9ParseAligment align;
GstCaps *in_caps = NULL;
const gchar *profile;
str = gst_caps_get_structure (caps, 0);
/* accept upstream info if provided */
gst_structure_get_int (str, "width", &self->width);
gst_structure_get_int (str, "height", &self->height);
profile = gst_structure_get_string (str, "profile");
if (profile)
self->profile = gst_vp9_parse_profile_from_string (profile);
/* get upstream align from caps */
gst_vp9_parse_alignment_from_caps (caps, &align);
/* default */
if (align == GST_VP9_PARSE_ALIGN_NONE)
align = GST_VP9_PARSE_ALIGN_SUPER_FRAME;
/* prefer alignment type determined above */
in_caps = gst_caps_copy (caps);
gst_caps_set_simple (in_caps, "alignment", G_TYPE_STRING,
gst_vp9_parse_alignment_to_string (align), NULL);
/* negotiate with downstream, set output align */
gst_vp9_parse_negotiate (self, align, in_caps);
self->update_caps = TRUE;
/* if all of decoder's capability related values are provided
* by upstream, update src caps now */
if (self->width > 0 && self->height > 0 && profile)
gst_vp9_parse_update_src_caps (self, in_caps);
gst_caps_unref (in_caps);
self->in_align = align;
return TRUE;
}
static void
remove_fields (GstCaps * caps, gboolean all)
{
guint i, n;
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (caps, i);
if (all) {
gst_structure_remove_field (s, "alignment");
}
gst_structure_remove_field (s, "parsed");
}
}
static GstCaps *
gst_vp9_parse_get_sink_caps (GstBaseParse * parse, GstCaps * filter)
{
GstCaps *peercaps, *templ;
GstCaps *res, *tmp, *pcopy;
templ = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD (parse));
if (filter) {
GstCaps *fcopy = gst_caps_copy (filter);
/* Remove the fields we convert */
remove_fields (fcopy, TRUE);
peercaps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), fcopy);
gst_caps_unref (fcopy);
} else {
peercaps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), NULL);
}
pcopy = gst_caps_copy (peercaps);
remove_fields (pcopy, TRUE);
res = gst_caps_intersect_full (pcopy, templ, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (pcopy);
gst_caps_unref (templ);
if (filter) {
GstCaps *tmp = gst_caps_intersect_full (res, filter,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (res);
res = tmp;
}
/* Try if we can put the downstream caps first */
pcopy = gst_caps_copy (peercaps);
remove_fields (pcopy, FALSE);
tmp = gst_caps_intersect_full (pcopy, res, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (pcopy);
if (!gst_caps_is_empty (tmp))
res = gst_caps_merge (tmp, res);
else
gst_caps_unref (tmp);
gst_caps_unref (peercaps);
return res;
}