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gstreamer/gst/interlace/gstinterlace.c
Vivia Nikolaidou 76ce67e70b interlace: Add field switching mode for 2:2 field pattern 
In the 2:2 field pattern, interlace can switch from bottom-field-first
to top-field-first.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1349>
2020-06-24 11:15:48 +03:00

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/* GStreamer
* Copyright (C) 2010 David A. Schleef <ds@schleef.org>
* Copyright (C) 2010 Robert Swain <robert.swain@collabora.co.uk>
*
* 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.
*/
/**
* SECTION:element-interlace
* @title: interlace
*
* The interlace element takes a non-interlaced raw video stream as input,
* creates fields out of each frame, then combines fields into interlaced
* frames to output as an interlaced video stream. It can also produce
* telecined streams from progressive input.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v videotestsrc pattern=ball ! interlace ! xvimagesink
* ]|
* This pipeline illustrates the combing effects caused by displaying
* two interlaced fields as one progressive frame.
* |[
* gst-launch-1.0 -v filesrc location=/path/to/file ! decodebin ! videorate !
* videoscale ! video/x-raw,format=\(string\)I420,width=720,height=480,
* framerate=60000/1001,pixel-aspect-ratio=11/10 !
* interlace top-field-first=false ! autovideosink
* ]|
* This pipeline converts a progressive video stream into an interlaced
* stream suitable for standard definition NTSC.
* |[
* gst-launch-1.0 -v videotestsrc pattern=ball ! video/x-raw,
* format=\(string\)I420,width=720,height=480,framerate=24000/1001,
* pixel-aspect-ratio=11/10 ! interlace !
* autovideosink
* ]|
* This pipeline converts a 24 frames per second progressive film stream into a
* 30000/1001 2:3:2:3... pattern telecined stream suitable for displaying film
* content on NTSC.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
GST_DEBUG_CATEGORY (gst_interlace_debug);
#define GST_CAT_DEFAULT gst_interlace_debug
#define GST_TYPE_INTERLACE \
(gst_interlace_get_type())
#define GST_INTERLACE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_INTERLACE,GstInterlace))
#define GST_INTERLACE_DEC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_INTERLACE,GstInterlaceClass))
#define GST_IS_GST_INTERLACE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_INTERLACE))
#define GST_IS_GST_INTERLACE_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_INTERLACE))
typedef struct _GstInterlace GstInterlace;
typedef struct _GstInterlaceClass GstInterlaceClass;
struct _GstInterlace
{
GstElement element;
GstPad *srcpad;
GstPad *sinkpad;
/* properties */
gboolean top_field_first;
gint pattern;
gboolean allow_rff;
/* state */
GstVideoInfo info;
GstVideoInfo out_info;
int src_fps_n;
int src_fps_d;
GstBuffer *stored_frame;
guint stored_fields;
guint phase_index;
guint field_index; /* index of the next field to push, 0=top 1=bottom */
GstClockTime timebase;
guint fields_since_timebase;
guint pattern_offset; /* initial offset into the pattern */
gboolean passthrough;
gboolean switch_fields;
};
struct _GstInterlaceClass
{
GstElementClass element_class;
};
enum
{
PROP_0,
PROP_TOP_FIELD_FIRST,
PROP_PATTERN,
PROP_PATTERN_OFFSET,
PROP_ALLOW_RFF
};
typedef enum
{
GST_INTERLACE_PATTERN_1_1,
GST_INTERLACE_PATTERN_2_2,
GST_INTERLACE_PATTERN_2_3,
GST_INTERLACE_PATTERN_2_3_3_2,
GST_INTERLACE_PATTERN_EURO,
GST_INTERLACE_PATTERN_3_4R3,
GST_INTERLACE_PATTERN_3R7_4,
GST_INTERLACE_PATTERN_3_3_4,
GST_INTERLACE_PATTERN_3_3,
GST_INTERLACE_PATTERN_3_2R4,
GST_INTERLACE_PATTERN_1_2R4,
} GstInterlacePattern;
#define GST_INTERLACE_PATTERN (gst_interlace_pattern_get_type ())
static GType
gst_interlace_pattern_get_type (void)
{
static GType interlace_pattern_type = 0;
static const GEnumValue pattern_types[] = {
{GST_INTERLACE_PATTERN_1_1, "1:1 (e.g. 60p -> 60i)", "1:1"},
{GST_INTERLACE_PATTERN_2_2, "2:2 (e.g. 30p -> 60i)", "2:2"},
{GST_INTERLACE_PATTERN_2_3, "2:3 (e.g. 24p -> 60i telecine)", "2:3"},
{GST_INTERLACE_PATTERN_2_3_3_2, "2:3:3:2 (e.g. 24p -> 60i telecine)",
"2:3:3:2"},
{GST_INTERLACE_PATTERN_EURO, "Euro 2-11:3 (e.g. 24p -> 50i telecine)",
"2-11:3"},
{GST_INTERLACE_PATTERN_3_4R3, "3:4-3 (e.g. 16p -> 60i telecine)", "3:4-3"},
{GST_INTERLACE_PATTERN_3R7_4, "3-7:4 (e.g. 16p -> 50i telecine)", "3-7:4"},
{GST_INTERLACE_PATTERN_3_3_4, "3:3:4 (e.g. 18p -> 60i telecine)", "3:3:4"},
{GST_INTERLACE_PATTERN_3_3, "3:3 (e.g. 20p -> 60i telecine)", "3:3"},
{GST_INTERLACE_PATTERN_3_2R4, "3:2-4 (e.g. 27.5p -> 60i telecine)",
"3:2-4"},
{GST_INTERLACE_PATTERN_1_2R4, "1:2-4 (e.g. 27.5p -> 50i telecine)",
"1:2-4"},
{0, NULL, NULL}
};
if (!interlace_pattern_type) {
interlace_pattern_type =
g_enum_register_static ("GstInterlacePattern", pattern_types);
}
return interlace_pattern_type;
}
#define VIDEO_FORMATS "{AYUV,YUY2,UYVY,I420,YV12,Y42B,Y444,NV12,NV21}"
static GstStaticPadTemplate gst_interlace_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (VIDEO_FORMATS)
",interlace-mode={interleaved,mixed} ;"
GST_VIDEO_CAPS_MAKE_WITH_FEATURES (GST_CAPS_FEATURE_FORMAT_INTERLACED,
VIDEO_FORMATS)
",interlace-mode=alternate")
);
static GstStaticPadTemplate gst_interlace_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE
("{AYUV,YUY2,UYVY,I420,YV12,Y42B,Y444,NV12,NV21}")
)
);
GType gst_interlace_get_type (void);
static void gst_interlace_finalize (GObject * obj);
static void gst_interlace_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_interlace_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static gboolean gst_interlace_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_interlace_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstFlowReturn gst_interlace_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static gboolean gst_interlace_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstStateChangeReturn gst_interlace_change_state (GstElement * element,
GstStateChange transition);
#define gst_interlace_parent_class parent_class
G_DEFINE_TYPE (GstInterlace, gst_interlace, GST_TYPE_ELEMENT);
static void
gst_interlace_class_init (GstInterlaceClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->set_property = gst_interlace_set_property;
object_class->get_property = gst_interlace_get_property;
object_class->finalize = gst_interlace_finalize;
g_object_class_install_property (object_class, PROP_TOP_FIELD_FIRST,
g_param_spec_boolean ("top-field-first", "top field first",
"Interlaced stream should be top field first", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_PATTERN,
g_param_spec_enum ("field-pattern", "Field pattern",
"The output field pattern", GST_INTERLACE_PATTERN,
GST_INTERLACE_PATTERN_2_3,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_PATTERN_OFFSET,
g_param_spec_uint ("pattern-offset", "Pattern offset",
"The initial field pattern offset. Counts from 0.",
0, 12, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_ALLOW_RFF,
g_param_spec_boolean ("allow-rff", "Allow Repeat-First-Field flags",
"Allow generation of buffers with RFF flag set, i.e., duration of 3 fields",
FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (element_class,
"Interlace filter", "Filter/Video",
"Creates an interlaced video from progressive frames",
"David Schleef <ds@schleef.org>");
gst_element_class_add_static_pad_template (element_class,
&gst_interlace_sink_template);
gst_element_class_add_static_pad_template (element_class,
&gst_interlace_src_template);
element_class->change_state = gst_interlace_change_state;
gst_type_mark_as_plugin_api (GST_INTERLACE_PATTERN, 0);
}
static void
gst_interlace_finalize (GObject * obj)
{
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gst_interlace_reset (GstInterlace * interlace)
{
interlace->phase_index = interlace->pattern_offset;
interlace->timebase = GST_CLOCK_TIME_NONE;
interlace->field_index = 0;
interlace->passthrough = FALSE;
interlace->switch_fields = FALSE;
if (interlace->stored_frame) {
gst_buffer_unref (interlace->stored_frame);
interlace->stored_frame = NULL;
}
}
static void
gst_interlace_init (GstInterlace * interlace)
{
GST_DEBUG ("gst_interlace_init");
interlace->sinkpad =
gst_pad_new_from_static_template (&gst_interlace_sink_template, "sink");
gst_pad_set_chain_function (interlace->sinkpad, gst_interlace_chain);
gst_pad_set_event_function (interlace->sinkpad, gst_interlace_sink_event);
gst_pad_set_query_function (interlace->sinkpad, gst_interlace_sink_query);
gst_element_add_pad (GST_ELEMENT (interlace), interlace->sinkpad);
interlace->srcpad =
gst_pad_new_from_static_template (&gst_interlace_src_template, "src");
gst_pad_set_query_function (interlace->srcpad, gst_interlace_src_query);
gst_element_add_pad (GST_ELEMENT (interlace), interlace->srcpad);
interlace->top_field_first = FALSE;
interlace->allow_rff = FALSE;
interlace->pattern = GST_INTERLACE_PATTERN_2_3;
interlace->pattern_offset = 0;
gst_interlace_reset (interlace);
}
typedef struct _PulldownFormat PulldownFormat;
struct _PulldownFormat
{
const gchar *name;
/* ratio between outgoing field rate / 2 and incoming frame rate.
* I.e., 24p -> 60i is 1.25 */
int ratio_n, ratio_d;
int n_fields[13];
};
static const PulldownFormat formats[] = {
/* 60p -> 60i or 50p -> 50i */
{"1:1", 1, 2, {1}},
/* 30p -> 60i or 25p -> 50i */
{"2:2", 1, 1, {2}},
/* 24p -> 60i telecine */
{"2:3", 5, 4, {2, 3,}},
{"2:3:3:2", 5, 4, {2, 3, 3, 2,}},
/* 24p -> 50i Euro pulldown */
{"2-11:3", 25, 24, {2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3,}},
/* 16p (16000/1001) -> 60i (NTSC 30000/1001) */
{"3:4-3", 15, 8, {3, 4, 4, 4,}},
/* 16p -> 50i (PAL) */
{"3-7:4", 25, 16, {3, 3, 3, 3, 3, 3, 3, 4,}},
/* 18p to NTSC 60i */
{"3:3:4", 5, 3, {3, 3, 4,}},
/* 20p to NTSC 60i */
{"3:3", 3, 2, {3, 3,}},
/* 27.5 to NTSC 60i */
{"3:2-4", 11, 10, {3, 2, 2, 2, 2,}},
/* 27.5 to PAL 50i */
{"1:2-4", 9, 10, {1, 2, 2, 2, 2,}},
};
static void
gst_interlace_decorate_buffer_ts (GstInterlace * interlace, GstBuffer * buf,
int n_fields)
{
/* field duration = src_fps_d / (2 * src_fps_n) */
if (interlace->src_fps_n == 0) {
/* If we don't know the fps, we can't generate timestamps/durations */
GST_BUFFER_DTS (buf) = GST_CLOCK_TIME_NONE;
GST_BUFFER_PTS (buf) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (buf) = GST_CLOCK_TIME_NONE;
} else {
GST_BUFFER_DTS (buf) = interlace->timebase +
gst_util_uint64_scale (GST_SECOND,
interlace->src_fps_d * interlace->fields_since_timebase,
interlace->src_fps_n * 2);
GST_BUFFER_PTS (buf) = GST_BUFFER_DTS (buf);
GST_BUFFER_DURATION (buf) =
gst_util_uint64_scale (GST_SECOND, interlace->src_fps_d * n_fields,
interlace->src_fps_n * 2);
}
}
static void
gst_interlace_decorate_buffer (GstInterlace * interlace, GstBuffer * buf,
int n_fields, gboolean interlaced)
{
gst_interlace_decorate_buffer_ts (interlace, buf, n_fields);
if (interlace->field_index == 0) {
GST_BUFFER_FLAG_SET (buf, GST_VIDEO_BUFFER_FLAG_TFF);
}
if (n_fields == 3) {
GST_BUFFER_FLAG_SET (buf, GST_VIDEO_BUFFER_FLAG_RFF);
}
if (n_fields == 1) {
GST_BUFFER_FLAG_SET (buf, GST_VIDEO_BUFFER_FLAG_ONEFIELD);
}
if (interlace->pattern > GST_INTERLACE_PATTERN_2_2 && n_fields == 2
&& interlaced) {
GST_BUFFER_FLAG_SET (buf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
}
}
static const gchar *
interlace_mode_from_pattern (GstInterlace * interlace)
{
if (interlace->pattern > GST_INTERLACE_PATTERN_2_2)
return "mixed";
else
return "interleaved";
}
static GstCaps *
dup_caps_with_alternate (GstCaps * caps)
{
GstCaps *with_alternate;
GstCapsFeatures *features;
with_alternate = gst_caps_copy (caps);
features = gst_caps_features_new (GST_CAPS_FEATURE_FORMAT_INTERLACED, NULL);
gst_caps_set_features_simple (with_alternate, features);
gst_caps_set_simple (with_alternate, "interlace-mode", G_TYPE_STRING,
"alternate", NULL);
return with_alternate;
}
static gboolean
gst_interlace_setcaps (GstInterlace * interlace, GstCaps * caps)
{
gboolean ret;
GstVideoInfo info, out_info;
GstCaps *othercaps, *src_peer_caps;
const PulldownFormat *pdformat;
gboolean alternate;
int i;
if (!gst_video_info_from_caps (&info, caps))
goto caps_error;
/* Check if downstream prefers alternate mode */
othercaps = gst_caps_copy (caps);
gst_caps_set_simple (othercaps, "interlace-mode", G_TYPE_STRING,
interlace_mode_from_pattern (interlace), NULL);
gst_caps_append (othercaps, dup_caps_with_alternate (othercaps));
if (interlace->pattern == GST_INTERLACE_PATTERN_2_2) {
for (i = 0; i < gst_caps_get_size (othercaps); ++i) {
GstStructure *s;
s = gst_caps_get_structure (othercaps, i);
gst_structure_remove_field (s, "field-order");
}
}
src_peer_caps = gst_pad_peer_query_caps (interlace->srcpad, othercaps);
gst_caps_unref (othercaps);
othercaps = gst_caps_fixate (src_peer_caps);
if (gst_caps_is_empty (othercaps)) {
gst_caps_unref (othercaps);
goto caps_error;
}
if (!gst_video_info_from_caps (&out_info, othercaps)) {
gst_caps_unref (othercaps);
goto caps_error;
}
alternate =
GST_VIDEO_INFO_INTERLACE_MODE (&out_info) ==
GST_VIDEO_INTERLACE_MODE_ALTERNATE;
pdformat = &formats[interlace->pattern];
interlace->phase_index = interlace->pattern_offset;
interlace->src_fps_n = info.fps_n * pdformat->ratio_n;
interlace->src_fps_d = info.fps_d * pdformat->ratio_d;
if (alternate) {
GST_DEBUG_OBJECT (interlace,
"producing alternate stream as requested downstream");
}
interlace->switch_fields = FALSE;
if (gst_caps_can_intersect (caps, othercaps)) {
/* FIXME: field-order is optional in the caps. This means that, if we're
* in a non-telecine mode and we have TFF upstream and
* top-field-first=FALSE in interlace (or the other way around), AND
* field-order isn't mentioned in the caps, we will do passthrough here
* and end up outptuting wrong data. Must detect missing field-order info
* and not do passthrough in that case, but instead check the
* GstVideoBufferFlags at the switch_fields check */
interlace->passthrough = TRUE;
} else {
if (GST_VIDEO_INFO_IS_INTERLACED (&info)) {
if (interlace->pattern == GST_INTERLACE_PATTERN_2_2) {
/* There is a chance we'd have to switch fields when in fact doing
* passthrough - see FIXME comment above, basically it would
* auto-negotiate to passthrough (because field-order is missing from
* the caps) */
GstCaps *clonedcaps = gst_caps_copy (othercaps);
for (i = 0; i < gst_caps_get_size (clonedcaps); ++i) {
GstStructure *s = gst_caps_get_structure (clonedcaps, i);
gst_structure_remove_field (s, "field-order");
}
if (gst_caps_can_intersect (caps, clonedcaps)) {
interlace->switch_fields = TRUE;
gst_caps_unref (clonedcaps);
} else {
gst_caps_unref (clonedcaps);
GST_ERROR_OBJECT (interlace,
"Caps %" GST_PTR_FORMAT " not compatible with %" GST_PTR_FORMAT,
caps, othercaps);
gst_caps_unref (othercaps);
goto caps_error;
}
} else {
GST_ERROR_OBJECT (interlace,
"Caps %" GST_PTR_FORMAT " not compatible with %" GST_PTR_FORMAT,
caps, othercaps);
gst_caps_unref (othercaps);
goto caps_error;
}
}
interlace->passthrough = FALSE;
gst_caps_set_simple (othercaps, "framerate", GST_TYPE_FRACTION,
interlace->src_fps_n, interlace->src_fps_d, NULL);
if (interlace->pattern <= GST_INTERLACE_PATTERN_2_2 || alternate) {
gst_caps_set_simple (othercaps, "field-order", G_TYPE_STRING,
interlace->top_field_first ? "top-field-first" : "bottom-field-first",
NULL);
}
/* outcaps changed, regenerate out_info */
gst_video_info_from_caps (&out_info, othercaps);
}
GST_DEBUG_OBJECT (interlace->sinkpad, "set caps %" GST_PTR_FORMAT, caps);
GST_DEBUG_OBJECT (interlace->srcpad, "set caps %" GST_PTR_FORMAT, othercaps);
ret = gst_pad_set_caps (interlace->srcpad, othercaps);
gst_caps_unref (othercaps);
interlace->info = info;
interlace->out_info = out_info;
return ret;
caps_error:
{
GST_DEBUG_OBJECT (interlace, "error parsing caps");
return FALSE;
}
}
static gboolean
gst_interlace_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean ret;
GstInterlace *interlace;
interlace = GST_INTERLACE (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (interlace, "handling FLUSH_START");
ret = gst_pad_push_event (interlace->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
GST_DEBUG_OBJECT (interlace, "handling FLUSH_STOP");
gst_interlace_reset (interlace);
ret = gst_pad_push_event (interlace->srcpad, event);
break;
case GST_EVENT_EOS:
#if 0
/* FIXME revive this when we output ONEFIELD and RFF buffers */
{
gint num_fields;
const PulldownFormat *format = &formats[interlace->pattern];
num_fields =
format->n_fields[interlace->phase_index] -
interlace->stored_fields_pushed;
interlace->stored_fields_pushed = 0;
/* on EOS we want to push as many sane frames as are left */
while (num_fields > 1) {
GstBuffer *output_buffer;
/* make metadata writable before editing it */
interlace->stored_frame =
gst_buffer_make_metadata_writable (interlace->stored_frame);
num_fields -= 2;
gst_interlace_decorate_buffer (interlace, interlace->stored_frame,
n_fields, FALSE);
/* ref output_buffer/stored frame because we want to keep it for now
* and pushing gives away a ref */
output_buffer = gst_buffer_ref (interlace->stored_frame);
if (gst_pad_push (interlace->srcpad, output_buffer)) {
GST_DEBUG_OBJECT (interlace, "Failed to push buffer %p",
output_buffer);
return FALSE;
}
output_buffer = NULL;
if (num_fields <= 1) {
gst_buffer_unref (interlace->stored_frame);
interlace->stored_frame = NULL;
break;
}
}
/* increment the phase index */
interlace->phase_index++;
if (!format->n_fields[interlace->phase_index]) {
interlace->phase_index = 0;
}
}
#endif
ret = gst_pad_push_event (interlace->srcpad, event);
break;
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_interlace_setcaps (interlace, caps);
gst_event_unref (event);
break;
}
default:
ret = gst_pad_push_event (interlace->srcpad, event);
break;
}
return ret;
}
static gboolean
gst_interlace_fraction_double (gint * n_out, gint * d_out, gboolean half)
{
gint n, d, gcd;
n = *n_out;
d = *d_out;
if (d == 0)
return FALSE;
if (n == 0)
return TRUE;
gcd = gst_util_greatest_common_divisor (n, d);
n /= gcd;
d /= gcd;
if (half) {
if (G_MAXINT / 2 >= ABS (d)) {
d *= 2;
} else if (n >= 2 && n != G_MAXINT) {
n /= 2;
} else {
d = G_MAXINT;
}
} else {
if (G_MAXINT / 2 >= ABS (n)) {
n *= 2;
} else if (d >= 2 && d != G_MAXINT) {
d /= 2;
} else {
n = G_MAXINT;
}
}
*n_out = n;
*d_out = d;
return TRUE;
}
static GstCaps *
gst_interlace_caps_double_framerate (GstCaps * caps, gboolean half)
{
guint len;
for (len = gst_caps_get_size (caps); len > 0; len--) {
GstStructure *s = gst_caps_get_structure (caps, len - 1);
const GValue *val;
val = gst_structure_get_value (s, "framerate");
if (!val)
continue;
if (G_VALUE_TYPE (val) == GST_TYPE_FRACTION) {
gint n, d;
n = gst_value_get_fraction_numerator (val);
d = gst_value_get_fraction_denominator (val);
if (!gst_interlace_fraction_double (&n, &d, half)) {
gst_caps_remove_structure (caps, len - 1);
continue;
}
gst_structure_set (s, "framerate", GST_TYPE_FRACTION, n, d, NULL);
} else if (G_VALUE_TYPE (val) == GST_TYPE_FRACTION_RANGE) {
const GValue *min, *max;
GValue nrange = { 0, }, nmin = {
0,}, nmax = {
0,};
gint n, d;
g_value_init (&nrange, GST_TYPE_FRACTION_RANGE);
g_value_init (&nmin, GST_TYPE_FRACTION);
g_value_init (&nmax, GST_TYPE_FRACTION);
min = gst_value_get_fraction_range_min (val);
max = gst_value_get_fraction_range_max (val);
n = gst_value_get_fraction_numerator (min);
d = gst_value_get_fraction_denominator (min);
if (!gst_interlace_fraction_double (&n, &d, half)) {
g_value_unset (&nrange);
g_value_unset (&nmax);
g_value_unset (&nmin);
gst_caps_remove_structure (caps, len - 1);
continue;
}
gst_value_set_fraction (&nmin, n, d);
n = gst_value_get_fraction_numerator (max);
d = gst_value_get_fraction_denominator (max);
if (!gst_interlace_fraction_double (&n, &d, half)) {
g_value_unset (&nrange);
g_value_unset (&nmax);
g_value_unset (&nmin);
gst_caps_remove_structure (caps, len - 1);
continue;
}
gst_value_set_fraction (&nmax, n, d);
gst_value_set_fraction_range (&nrange, &nmin, &nmax);
gst_structure_take_value (s, "framerate", &nrange);
g_value_unset (&nmin);
g_value_unset (&nmax);
} else if (G_VALUE_TYPE (val) == GST_TYPE_LIST) {
const GValue *lval;
GValue nlist = { 0, };
GValue nval = { 0, };
gint i;
g_value_init (&nlist, GST_TYPE_LIST);
for (i = gst_value_list_get_size (val); i > 0; i--) {
gint n, d;
lval = gst_value_list_get_value (val, i - 1);
if (G_VALUE_TYPE (lval) != GST_TYPE_FRACTION)
continue;
n = gst_value_get_fraction_numerator (lval);
d = gst_value_get_fraction_denominator (lval);
/* Double/Half the framerate but if this fails simply
* skip this value from the list */
if (!gst_interlace_fraction_double (&n, &d, half)) {
continue;
}
g_value_init (&nval, GST_TYPE_FRACTION);
gst_value_set_fraction (&nval, n, d);
gst_value_list_append_and_take_value (&nlist, &nval);
}
gst_structure_take_value (s, "framerate", &nlist);
}
}
return caps;
}
static GstCaps *
gst_interlace_getcaps (GstPad * pad, GstInterlace * interlace, GstCaps * filter)
{
GstPad *otherpad;
GstCaps *othercaps, *tcaps;
GstCaps *icaps;
GstCaps *clean_filter = NULL;
const char *mode;
guint i;
otherpad =
(pad == interlace->srcpad) ? interlace->sinkpad : interlace->srcpad;
if (filter != NULL) {
clean_filter = gst_caps_copy (filter);
if (interlace->pattern == GST_INTERLACE_PATTERN_1_1) {
clean_filter =
gst_interlace_caps_double_framerate (clean_filter,
(pad == interlace->sinkpad));
} else if (interlace->pattern != GST_INTERLACE_PATTERN_2_2) {
GST_FIXME_OBJECT (interlace,
"Add calculations for telecine framerate conversions");
for (i = 0; i < gst_caps_get_size (clean_filter); ++i) {
GstStructure *s = gst_caps_get_structure (clean_filter, i);
gst_structure_remove_field (s, "framerate");
}
}
if (pad == interlace->sinkpad) {
/* @filter may contain the different formats supported upstream.
* Those will be used to filter the src pad caps as this element
* is not supposed to do any video format conversion.
* Add a variant of the filter with the Interlaced feature as we want
* to be able to negotiate it if needed.
*/
gst_caps_append (clean_filter, dup_caps_with_alternate (clean_filter));
}
for (i = 0; i < gst_caps_get_size (clean_filter); ++i) {
GstStructure *s;
s = gst_caps_get_structure (clean_filter, i);
gst_structure_remove_field (s, "interlace-mode");
if (interlace->pattern == GST_INTERLACE_PATTERN_2_2
&& pad == interlace->sinkpad) {
gst_structure_remove_field (s, "field-order");
}
}
}
tcaps = gst_pad_get_pad_template_caps (otherpad);
othercaps = gst_pad_peer_query_caps (otherpad, clean_filter);
if (othercaps) {
if (interlace->pattern == GST_INTERLACE_PATTERN_2_2) {
for (i = 0; i < gst_caps_get_size (othercaps); ++i) {
GstStructure *s = gst_caps_get_structure (othercaps, i);
if (pad == interlace->srcpad) {
gst_structure_set (s, "field-order", G_TYPE_STRING,
interlace->top_field_first ? "top-field-first" :
"bottom-field-first", NULL);
} else {
gst_structure_remove_field (s, "field-order");
}
}
}
icaps = gst_caps_intersect (othercaps, tcaps);
gst_caps_unref (othercaps);
gst_caps_unref (tcaps);
} else {
icaps = tcaps;
}
if (clean_filter) {
othercaps = gst_caps_intersect (icaps, clean_filter);
gst_caps_unref (icaps);
icaps = othercaps;
}
icaps = gst_caps_make_writable (icaps);
mode = interlace_mode_from_pattern (interlace);
if (pad == interlace->srcpad) {
/* Set interlace-mode to what the element will produce, so either
* mixed/interleaved or alternate if the caps feature is present. */
gst_caps_set_simple (icaps, "interlace-mode", G_TYPE_STRING, mode, NULL);
icaps = gst_caps_merge (icaps, dup_caps_with_alternate (icaps));
} else {
GstCaps *interlaced, *alternate;
/* Sink pad is supposed to receive a progressive stream so remove the
* Interlaced feature and set interlace-mode=progressive */
for (i = 0; i < gst_caps_get_size (icaps); ++i) {
GstCapsFeatures *features;
features = gst_caps_get_features (icaps, i);
gst_caps_features_remove (features, GST_CAPS_FEATURE_FORMAT_INTERLACED);
}
gst_caps_set_simple (icaps, "interlace-mode", G_TYPE_STRING,
"progressive", NULL);
/* Now add variants of the same caps with the interlace-mode and Interlaced
* caps so we can operate in passthrough if needed. */
interlaced = gst_caps_copy (icaps);
gst_caps_set_simple (interlaced, "interlace-mode", G_TYPE_STRING, mode,
NULL);
alternate = dup_caps_with_alternate (icaps);
icaps = gst_caps_merge (icaps, interlaced);
icaps = gst_caps_merge (icaps, alternate);
}
if (interlace->pattern == GST_INTERLACE_PATTERN_1_1) {
icaps =
gst_interlace_caps_double_framerate (icaps, (pad == interlace->srcpad));
} else if (interlace->pattern != GST_INTERLACE_PATTERN_2_2) {
GST_FIXME_OBJECT (interlace,
"Add calculations for telecine framerate conversions");
for (i = 0; i < gst_caps_get_size (icaps); ++i) {
GstStructure *s = gst_caps_get_structure (icaps, i);
gst_structure_remove_field (s, "framerate");
}
}
if (clean_filter)
gst_caps_unref (clean_filter);
GST_DEBUG_OBJECT (pad, "caps: %" GST_PTR_FORMAT, icaps);
return icaps;
}
static gboolean
gst_interlace_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean ret;
GstInterlace *interlace;
interlace = GST_INTERLACE (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_interlace_getcaps (pad, interlace, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
ret = TRUE;
break;
}
default:
ret = gst_pad_query_default (pad, parent, query);
break;
}
return ret;
}
static gboolean
gst_interlace_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean ret;
GstInterlace *interlace;
interlace = GST_INTERLACE (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_interlace_getcaps (pad, interlace, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
ret = TRUE;
break;
}
default:
ret = gst_pad_query_default (pad, parent, query);
break;
}
return ret;
}
static void
copy_fields (GstInterlace * interlace, GstBuffer * dest, GstBuffer * src,
int field_index)
{
GstVideoInfo *info = &interlace->info;
gint i, j, n_planes;
guint8 *d, *s;
GstVideoFrame dframe, sframe;
if (!gst_video_frame_map (&dframe, info, dest, GST_MAP_WRITE))
goto dest_map_failed;
if (!gst_video_frame_map (&sframe, info, src, GST_MAP_READ))
goto src_map_failed;
n_planes = GST_VIDEO_FRAME_N_PLANES (&dframe);
for (i = 0; i < n_planes; i++) {
gint cheight, cwidth;
gint ss, ds;
d = GST_VIDEO_FRAME_PLANE_DATA (&dframe, i);
s = GST_VIDEO_FRAME_PLANE_DATA (&sframe, i);
ds = GST_VIDEO_FRAME_PLANE_STRIDE (&dframe, i);
ss = GST_VIDEO_FRAME_PLANE_STRIDE (&sframe, i);
d += field_index * ds;
if (!interlace->switch_fields) {
s += field_index * ss;
} else {
s += (field_index ^ 1) * ss;
}
cheight = GST_VIDEO_FRAME_COMP_HEIGHT (&dframe, i);
cwidth = MIN (ABS (ss), ABS (ds));
for (j = field_index; j < cheight; j += 2) {
memcpy (d, s, cwidth);
d += ds * 2;
s += ss * 2;
}
}
gst_video_frame_unmap (&dframe);
gst_video_frame_unmap (&sframe);
return;
dest_map_failed:
{
GST_ERROR_OBJECT (interlace, "failed to map dest");
return;
}
src_map_failed:
{
GST_ERROR_OBJECT (interlace, "failed to map src");
gst_video_frame_unmap (&dframe);
return;
}
}
static GstBuffer *
copy_field (GstInterlace * interlace, GstBuffer * src, int field_index)
{
gint i, j, n_planes;
GstVideoFrame dframe, sframe;
GstBuffer *dest;
dest =
gst_buffer_new_allocate (NULL,
GST_VIDEO_INFO_SIZE (&interlace->out_info), NULL);
if (!gst_video_frame_map (&dframe, &interlace->out_info, dest, GST_MAP_WRITE))
goto dest_map_failed;
if (!gst_video_frame_map (&sframe, &interlace->info, src, GST_MAP_READ))
goto src_map_failed;
n_planes = GST_VIDEO_FRAME_N_PLANES (&dframe);
for (i = 0; i < n_planes; i++) {
guint8 *d, *s;
gint cheight, cwidth;
gint ss, ds;
d = GST_VIDEO_FRAME_PLANE_DATA (&dframe, i);
s = GST_VIDEO_FRAME_PLANE_DATA (&sframe, i);
ds = GST_VIDEO_FRAME_PLANE_STRIDE (&dframe, i);
ss = GST_VIDEO_FRAME_PLANE_STRIDE (&sframe, i);
cheight = GST_VIDEO_FRAME_COMP_HEIGHT (&sframe, i);
cwidth = MIN (ABS (ss), ABS (ds));
for (j = field_index; j < cheight; j += 2) {
memcpy (d, s, cwidth);
d += ds;
s += ss * 2;
}
}
gst_video_frame_unmap (&dframe);
gst_video_frame_unmap (&sframe);
return dest;
dest_map_failed:
{
GST_ELEMENT_ERROR (interlace, CORE, FAILED,
("Failed to write map buffer"),
("Failed to map dest buffer for field %d", field_index));
gst_buffer_unref (dest);
return NULL;
}
src_map_failed:
{
GST_ELEMENT_ERROR (interlace, CORE, FAILED, ("Failed to read map buffer"),
("Failed to map source buffer for field %d", field_index));
gst_buffer_unref (dest);
gst_video_frame_unmap (&dframe);
return NULL;
}
}
static GstFlowReturn
gst_interlace_push_buffer (GstInterlace * interlace, GstBuffer * buffer)
{
GST_DEBUG_OBJECT (interlace, "output timestamp %" GST_TIME_FORMAT
" duration %" GST_TIME_FORMAT " flags %04x %s %s %s",
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)),
GST_BUFFER_FLAGS (buffer),
(GST_BUFFER_FLAGS (buffer) & GST_VIDEO_BUFFER_FLAG_TFF) ? "tff" :
"",
(GST_BUFFER_FLAGS (buffer) & GST_VIDEO_BUFFER_FLAG_RFF) ? "rff" :
"",
(GST_BUFFER_FLAGS (buffer) & GST_VIDEO_BUFFER_FLAG_ONEFIELD) ?
"onefield" : "");
return gst_pad_push (interlace->srcpad, buffer);
}
static GstFlowReturn
gst_interlace_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstInterlace *interlace = GST_INTERLACE (parent);
GstFlowReturn ret = GST_FLOW_OK;
gint num_fields = 0;
guint current_fields;
const PulldownFormat *format;
GstClockTime timestamp;
gboolean alternate;
timestamp = GST_BUFFER_TIMESTAMP (buffer);
GST_DEBUG ("Received buffer at %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));
GST_DEBUG ("duration %" GST_TIME_FORMAT " flags %04x %s %s %s",
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)),
GST_BUFFER_FLAGS (buffer),
(GST_BUFFER_FLAGS (buffer) & GST_VIDEO_BUFFER_FLAG_TFF) ? "tff" : "",
(GST_BUFFER_FLAGS (buffer) & GST_VIDEO_BUFFER_FLAG_RFF) ? "rff" : "",
(GST_BUFFER_FLAGS (buffer) & GST_VIDEO_BUFFER_FLAG_ONEFIELD) ?
"onefield" : "");
if (interlace->passthrough) {
return gst_pad_push (interlace->srcpad, buffer);
}
if (GST_BUFFER_FLAGS (buffer) & GST_BUFFER_FLAG_DISCONT) {
GST_DEBUG ("discont");
if (interlace->stored_frame) {
gst_buffer_unref (interlace->stored_frame);
}
interlace->stored_frame = NULL;
interlace->stored_fields = 0;
if (interlace->top_field_first) {
interlace->field_index = 0;
} else {
interlace->field_index = 1;
}
}
if (interlace->timebase == GST_CLOCK_TIME_NONE) {
/* get the initial ts */
interlace->timebase = timestamp;
}
format = &formats[interlace->pattern];
if (interlace->stored_fields == 0
&& interlace->phase_index == interlace->pattern_offset
&& GST_CLOCK_TIME_IS_VALID (timestamp)) {
interlace->timebase = timestamp;
interlace->fields_since_timebase = 0;
}
current_fields = format->n_fields[interlace->phase_index];
/* increment the phase index */
interlace->phase_index++;
g_assert (interlace->phase_index < G_N_ELEMENTS (format->n_fields));
if (!format->n_fields[interlace->phase_index]) {
interlace->phase_index = 0;
}
if (interlace->switch_fields && !interlace->stored_frame) {
/* When switching fields, we want to skip the very first field of the very
* first frame, then take one field from the stored frame and one from the
* current one. This happens in the code when we do not have enough fields
* available on current_fields, so we decrement the number, which is what
* would happen if we had used one field. This way, the current frame
* will be stored and then its other field will be used the next time the
* chain function is called */
current_fields--;
}
GST_DEBUG ("incoming buffer assigned %d fields", current_fields);
alternate =
GST_VIDEO_INFO_INTERLACE_MODE (&interlace->out_info) ==
GST_VIDEO_INTERLACE_MODE_ALTERNATE;
num_fields = interlace->stored_fields + current_fields;
while (num_fields >= 2) {
GstBuffer *output_buffer, *output_buffer2 = NULL;
guint n_output_fields;
gboolean interlaced = FALSE;
GST_DEBUG ("have %d fields, %d current, %d stored",
num_fields, current_fields, interlace->stored_fields);
if (interlace->stored_fields > 0) {
GST_DEBUG ("1 field from stored, 1 from current");
if (alternate) {
/* take the first field from the stored frame */
output_buffer = copy_field (interlace, interlace->stored_frame,
interlace->field_index);
if (!output_buffer)
return GST_FLOW_ERROR;
/* take the second field from the incoming buffer */
output_buffer2 = copy_field (interlace, buffer,
interlace->field_index ^ 1);
if (!output_buffer2)
return GST_FLOW_ERROR;
} else {
output_buffer = gst_buffer_new_and_alloc (gst_buffer_get_size (buffer));
/* take the first field from the stored frame */
copy_fields (interlace, output_buffer, interlace->stored_frame,
interlace->field_index);
/* take the second field from the incoming buffer */
copy_fields (interlace, output_buffer, buffer,
interlace->field_index ^ 1);
}
interlace->stored_fields--;
current_fields--;
n_output_fields = 2;
interlaced = TRUE;
} else {
if (alternate) {
output_buffer = copy_field (interlace, buffer, interlace->field_index);
if (!output_buffer)
return GST_FLOW_ERROR;
output_buffer2 =
copy_field (interlace, buffer, interlace->field_index ^ 1);
if (!output_buffer2)
return GST_FLOW_ERROR;
} else {
output_buffer = gst_buffer_copy (buffer);
}
if (num_fields >= 3 && interlace->allow_rff) {
GST_DEBUG ("3 fields from current");
/* take both fields from incoming buffer */
current_fields -= 3;
n_output_fields = 3;
} else {
GST_DEBUG ("2 fields from current");
/* take both buffers from incoming buffer */
current_fields -= 2;
n_output_fields = 2;
}
}
num_fields -= n_output_fields;
if (!alternate) {
g_assert (!output_buffer2);
gst_interlace_decorate_buffer (interlace, output_buffer,
n_output_fields, interlaced);
} else {
g_assert (output_buffer2);
gst_interlace_decorate_buffer_ts (interlace, output_buffer,
n_output_fields);
/* Both fields share the same ts */
GST_BUFFER_PTS (output_buffer2) = GST_BUFFER_PTS (output_buffer);
GST_BUFFER_DTS (output_buffer2) = GST_BUFFER_DTS (output_buffer);
GST_BUFFER_DURATION (output_buffer2) =
GST_BUFFER_DURATION (output_buffer);
if (interlace->field_index == 0) {
GST_BUFFER_FLAG_SET (output_buffer, GST_VIDEO_BUFFER_FLAG_TOP_FIELD);
GST_BUFFER_FLAG_SET (output_buffer2,
GST_VIDEO_BUFFER_FLAG_BOTTOM_FIELD);
} else {
GST_BUFFER_FLAG_SET (output_buffer, GST_VIDEO_BUFFER_FLAG_BOTTOM_FIELD);
GST_BUFFER_FLAG_SET (output_buffer2, GST_VIDEO_BUFFER_FLAG_TOP_FIELD);
}
GST_BUFFER_FLAG_SET (output_buffer, GST_VIDEO_BUFFER_FLAG_INTERLACED);
GST_BUFFER_FLAG_SET (output_buffer2, GST_VIDEO_BUFFER_FLAG_INTERLACED);
}
/* Guard against overflows here. If this ever happens, resetting the phase
* above would never happen because of some bugs */
g_assert (interlace->fields_since_timebase <= G_MAXUINT - n_output_fields);
interlace->fields_since_timebase += n_output_fields;
interlace->field_index ^= (n_output_fields & 1);
ret = gst_interlace_push_buffer (interlace, output_buffer);
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (interlace, "Failed to push buffer %p", output_buffer);
break;
}
if (output_buffer2) {
ret = gst_interlace_push_buffer (interlace, output_buffer2);
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (interlace, "Failed to push buffer %p",
output_buffer2);
break;
}
}
}
GST_DEBUG ("done. %d fields remaining", current_fields);
if (interlace->stored_frame) {
gst_buffer_unref (interlace->stored_frame);
interlace->stored_frame = NULL;
interlace->stored_fields = 0;
}
if (current_fields > 0) {
interlace->stored_frame = buffer;
interlace->stored_fields = current_fields;
} else {
gst_buffer_unref (buffer);
}
return ret;
}
static void
gst_interlace_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstInterlace *interlace = GST_INTERLACE (object);
switch (prop_id) {
case PROP_TOP_FIELD_FIRST:
interlace->top_field_first = g_value_get_boolean (value);
break;
case PROP_PATTERN:
interlace->pattern = g_value_get_enum (value);
break;
case PROP_PATTERN_OFFSET:
interlace->pattern_offset = g_value_get_uint (value);
break;
case PROP_ALLOW_RFF:
interlace->allow_rff = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_interlace_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstInterlace *interlace = GST_INTERLACE (object);
switch (prop_id) {
case PROP_TOP_FIELD_FIRST:
g_value_set_boolean (value, interlace->top_field_first);
break;
case PROP_PATTERN:
g_value_set_enum (value, interlace->pattern);
break;
case PROP_PATTERN_OFFSET:
g_value_set_uint (value, interlace->pattern_offset);
break;
case PROP_ALLOW_RFF:
g_value_set_boolean (value, interlace->allow_rff);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_interlace_change_state (GstElement * element, GstStateChange transition)
{
//GstInterlace *interlace = GST_INTERLACE (element);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
//gst_interlace_reset (interlace);
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_interlace_debug, "interlace", 0,
"interlace element");
return gst_element_register (plugin, "interlace", GST_RANK_NONE,
GST_TYPE_INTERLACE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
interlace,
"Create an interlaced video stream",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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