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gstreamer/gst/interlace/gstinterlace.c
Robert Swain 0de362f248 interlace: Fix buffer timestamp and duration 
The field rate is twice the frame rate of the src pad and so the duration of
one output buffer is src_fps_d / (2 * src_fps_n).
2010-11-24 12:09:16 +01:00

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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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-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.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc pattern=ball ! interlace ! xvimagesink
* ]|
* This pipeline illustrates the combing effects caused by displaying
* two interlaced fields as one progressive frame.
* |[
* gst-launch -v filesrc location=/path/to/file ! decodebin ! videorate !
* videoscale ! video/x-raw-yuv,format=\(fourcc\)I420,width=720,height=480,
* framerate=60000/1001,pixel-aspect-ratio=11/10 !
* interlace top-field-first=false ! ...
* ]|
* This pipeline converts a progressive video stream into an interlaced
* stream suitable for standard definition NTSC.
* |[
* gst-launch -v videotestsrc pattern=ball ! video/x-raw-yuv,
* format=\(fourcc\)I420,width=720,height=480,framerate=24000/1001,
* pixel-aspect-ratio=11/10 ! interlace pattern=2:3 !
* ...
* ]|
* 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.
* </refsect2>
*/
#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;
GstCaps *srccaps;
/* properties */
gboolean top_field_first;
gint pattern;
gboolean allow_rff;
/* state */
int width;
int height;
GstVideoFormat format;
int src_fps_n;
int src_fps_d;
GstBuffer *stored_frame;
gint stored_fields;
gint phase_index;
int field_index; /* index of the next field to push, 0=top 1=bottom */
GstClockTime timebase;
int fields_since_timebase;
guint pattern_offset; /* initial offset into the pattern */
};
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
} 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", "1:1"},
{GST_INTERLACE_PATTERN_2_2, "2:2", "2:2"},
{GST_INTERLACE_PATTERN_2_3, "2:3", "2:3"},
{GST_INTERLACE_PATTERN_2_3_3_2, "2:3:3:2", "2:3:3:2"},
{GST_INTERLACE_PATTERN_EURO, "Euro 2-11:3", "2-11:3"},
{0, NULL, NULL}
};
if (!interlace_pattern_type) {
interlace_pattern_type =
g_enum_register_static ("GstInterlacePattern", pattern_types);
}
return interlace_pattern_type;
}
static GstStaticPadTemplate gst_interlace_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV
("{AYUV,YUY2,UYVY,I420,YV12,Y42B,Y444,NV12,NV21}")
",interlaced=TRUE")
);
static GstStaticPadTemplate gst_interlace_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV
("{AYUV,YUY2,UYVY,I420,YV12,Y42B,Y444,NV12,NV21}")
",interlaced=FALSE")
);
static void gst_interlace_base_init (gpointer g_class);
static void gst_interlace_class_init (GstInterlaceClass * klass);
static void gst_interlace_init (GstInterlace * interlace);
static gboolean gst_interlace_sink_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_interlace_chain (GstPad * pad, GstBuffer * buffer);
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_setcaps (GstPad * pad, GstCaps * caps);
static GstCaps *gst_interlace_getcaps (GstPad * pad);
static GstStateChangeReturn gst_interlace_change_state (GstElement * element,
GstStateChange transition);
static GstElementClass *parent_class = NULL;
static GType
gst_interlace_get_type (void)
{
static GType interlace_type = 0;
if (!interlace_type) {
static const GTypeInfo interlace_info = {
sizeof (GstInterlaceClass),
gst_interlace_base_init,
NULL,
(GClassInitFunc) gst_interlace_class_init,
NULL,
NULL,
sizeof (GstInterlace),
0,
(GInstanceInitFunc) gst_interlace_init,
};
interlace_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstInterlace", &interlace_info, 0);
}
return interlace_type;
}
static void
gst_interlace_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class,
"Interlace filter", "Filter/Video",
"Creates an interlaced video from progressive frames",
"David Schleef <ds@schleef.org>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_interlace_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_interlace_src_template));
}
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;
element_class->change_state = gst_interlace_change_state;
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));
}
static void
gst_interlace_reset (GstInterlace * interlace)
{
interlace->phase_index = interlace->pattern_offset;
interlace->timebase = GST_CLOCK_TIME_NONE;
interlace->field_index = 0;
}
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_element_add_pad (GST_ELEMENT (interlace), interlace->sinkpad);
gst_pad_set_chain_function (interlace->sinkpad, gst_interlace_chain);
gst_pad_set_setcaps_function (interlace->sinkpad, gst_interlace_setcaps);
gst_pad_set_getcaps_function (interlace->sinkpad, gst_interlace_getcaps);
gst_pad_set_event_function (interlace->sinkpad, gst_interlace_sink_event);
interlace->srcpad =
gst_pad_new_from_static_template (&gst_interlace_src_template, "src");
gst_element_add_pad (GST_ELEMENT (interlace), interlace->srcpad);
gst_pad_set_setcaps_function (interlace->srcpad, gst_interlace_setcaps);
gst_pad_set_getcaps_function (interlace->srcpad, gst_interlace_getcaps);
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,}}
};
static void
gst_interlace_decorate_buffer (GstInterlace * interlace, GstBuffer * buf,
int n_fields)
{
/* field duration = src_fps_d / (2 * src_fps_n) */
GST_BUFFER_TIMESTAMP (buf) = interlace->timebase +
gst_util_uint64_scale (GST_SECOND,
interlace->src_fps_d * interlace->fields_since_timebase,
interlace->src_fps_n * 2);
GST_BUFFER_DURATION (buf) =
gst_util_uint64_scale (GST_SECOND, interlace->src_fps_d * n_fields,
interlace->src_fps_n * 2);
/* increment the buffer timestamp by duration for the next buffer */
gst_buffer_set_caps (buf, interlace->srccaps);
if (interlace->field_index == 0) {
GST_BUFFER_FLAG_SET (buf, GST_VIDEO_BUFFER_TFF);
}
if (n_fields == 3) {
GST_BUFFER_FLAG_SET (buf, GST_VIDEO_BUFFER_RFF);
}
if (n_fields == 1) {
GST_BUFFER_FLAG_SET (buf, GST_VIDEO_BUFFER_ONEFIELD);
}
}
static gboolean
gst_interlace_sink_event (GstPad * pad, GstEvent * event)
{
gboolean ret;
GstInterlace *interlace;
interlace = GST_INTERLACE (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (interlace, "handling FLUSH_START");
if (interlace->stored_frame) {
gst_buffer_unref (interlace->stored_frame);
interlace->stored_frame = NULL;
}
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);
/* 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;
default:
ret = gst_pad_push_event (interlace->srcpad, event);
break;
}
g_object_unref (interlace);
return ret;
}
static GstCaps *
gst_interlace_getcaps (GstPad * pad)
{
GstInterlace *interlace;
GstPad *otherpad;
GstCaps *othercaps;
GstCaps *icaps;
interlace = GST_INTERLACE (gst_pad_get_parent (pad));
otherpad =
(pad == interlace->srcpad) ? interlace->sinkpad : interlace->srcpad;
othercaps = gst_pad_peer_get_caps (otherpad);
if (othercaps == NULL) {
icaps = gst_caps_copy (gst_pad_get_pad_template_caps (otherpad));
} else {
icaps = gst_caps_intersect (othercaps,
gst_pad_get_pad_template_caps (otherpad));
gst_caps_unref (othercaps);
}
gst_caps_set_simple (icaps, "interlaced", G_TYPE_BOOLEAN,
pad == interlace->srcpad ? TRUE : FALSE, NULL);
return icaps;
}
static gboolean
gst_interlace_setcaps (GstPad * pad, GstCaps * caps)
{
GstInterlace *interlace;
gboolean ret;
int width, height;
GstVideoFormat format;
gboolean interlaced = TRUE;
int fps_n, fps_d;
GstPad *otherpad;
GstCaps *othercaps;
const PulldownFormat *pdformat;
interlace = GST_INTERLACE (gst_pad_get_parent (pad));
otherpad =
(pad == interlace->srcpad) ? interlace->sinkpad : interlace->srcpad;
ret = gst_video_format_parse_caps (caps, &format, &width, &height);
gst_video_format_parse_caps_interlaced (caps, &interlaced);
ret &= gst_video_parse_caps_framerate (caps, &fps_n, &fps_d);
if (!ret)
goto error;
othercaps = gst_caps_copy (caps);
pdformat = &formats[interlace->pattern];
if (pad == interlace->srcpad) {
gst_caps_set_simple (othercaps, "interlaced", G_TYPE_BOOLEAN, FALSE, NULL);
gst_caps_set_simple (othercaps, "framerate", GST_TYPE_FRACTION,
fps_n * pdformat->ratio_d, fps_d * pdformat->ratio_n, NULL);
} else {
gst_caps_set_simple (othercaps, "interlaced", G_TYPE_BOOLEAN, TRUE, NULL);
gst_caps_set_simple (othercaps, "framerate", GST_TYPE_FRACTION,
fps_n * pdformat->ratio_n, fps_d * pdformat->ratio_d, NULL);
}
ret = gst_pad_set_caps (otherpad, othercaps);
if (!ret)
goto error;
interlace->format = format;
interlace->width = width;
interlace->height = height;
interlace->phase_index = interlace->pattern_offset;
if (pad == interlace->sinkpad) {
gst_caps_replace (&interlace->srccaps, othercaps);
interlace->src_fps_n = fps_n * pdformat->ratio_n;
interlace->src_fps_d = fps_d * pdformat->ratio_d;
} else {
gst_caps_replace (&interlace->srccaps, caps);
interlace->src_fps_n = fps_n;
interlace->src_fps_d = fps_d;
}
error:
g_object_unref (interlace);
return ret;
}
static void
copy_field (GstInterlace * interlace, GstBuffer * d, GstBuffer * s,
int field_index)
{
int j;
guint8 *dest;
guint8 *src;
int width = interlace->width;
int height = interlace->height;
if (interlace->format == GST_VIDEO_FORMAT_I420 ||
interlace->format == GST_VIDEO_FORMAT_YV12) {
/* planar 4:2:0 */
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + j * width;
src = GST_BUFFER_DATA (s) + j * width;
memcpy (dest, src, width);
}
for (j = field_index; j < height / 2; j += 2) {
dest = GST_BUFFER_DATA (d) + width * height + j * width / 2;
src = GST_BUFFER_DATA (s) + width * height + j * width / 2;
memcpy (dest, src, width / 2);
}
for (j = field_index; j < height / 2; j += 2) {
dest =
GST_BUFFER_DATA (d) + width * height + width / 2 * height / 2 +
j * width / 2;
src =
GST_BUFFER_DATA (s) + width * height + width / 2 * height / 2 +
j * width / 2;
memcpy (dest, src, width / 2);
}
} else if (interlace->format == GST_VIDEO_FORMAT_UYVY ||
interlace->format == GST_VIDEO_FORMAT_YUY2) {
/* packed 4:2:2 */
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + j * width * 2;
src = GST_BUFFER_DATA (s) + j * width * 2;
memcpy (dest, src, width * 2);
}
} else if (interlace->format == GST_VIDEO_FORMAT_AYUV) {
/* packed 4:4:4 */
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + j * width * 4;
src = GST_BUFFER_DATA (s) + j * width * 4;
memcpy (dest, src, width * 4);
}
} else if (interlace->format == GST_VIDEO_FORMAT_Y42B) {
/* planar 4:2:2 */
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + j * width;
src = GST_BUFFER_DATA (s) + j * width;
memcpy (dest, src, width);
}
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + width * height + j * width / 2;
src = GST_BUFFER_DATA (s) + width * height + j * width / 2;
memcpy (dest, src, width / 2);
}
for (j = field_index; j < height; j += 2) {
dest =
GST_BUFFER_DATA (d) + width * height + width / 2 * height +
j * width / 2;
src =
GST_BUFFER_DATA (s) + width * height + width / 2 * height +
j * width / 2;
memcpy (dest, src, width / 2);
}
} else if (interlace->format == GST_VIDEO_FORMAT_Y444) {
/* planar 4:4:4 */
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + j * width;
src = GST_BUFFER_DATA (s) + j * width;
memcpy (dest, src, width);
}
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + width * height + j * width;
src = GST_BUFFER_DATA (s) + width * height + j * width;
memcpy (dest, src, width);
}
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + width * height + width * height + j * width;
src = GST_BUFFER_DATA (s) + width * height + width * height + j * width;
memcpy (dest, src, width);
}
} else if (interlace->format == GST_VIDEO_FORMAT_NV12 ||
interlace->format == GST_VIDEO_FORMAT_NV21) {
/* planar/packed 4:2:0 */
for (j = field_index; j < height; j += 2) {
dest = GST_BUFFER_DATA (d) + j * width;
src = GST_BUFFER_DATA (s) + j * width;
memcpy (dest, src, width);
}
for (j = field_index; j < height / 2; j += 2) {
dest = GST_BUFFER_DATA (d) + width * height + j * width;
src = GST_BUFFER_DATA (s) + width * height + j * width;
memcpy (dest, src, width);
}
} else {
g_assert_not_reached ();
}
}
static GstFlowReturn
gst_interlace_chain (GstPad * pad, GstBuffer * buffer)
{
GstInterlace *interlace = GST_INTERLACE (gst_pad_get_parent (pad));
GstFlowReturn ret = GST_FLOW_OK;
gint num_fields = 0;
int current_fields;
const PulldownFormat *format;
GST_DEBUG ("Received buffer at %u:%02u:%02u:%09u",
(guint) (GST_BUFFER_TIMESTAMP (buffer) / (GST_SECOND * 60 * 60)),
(guint) ((GST_BUFFER_TIMESTAMP (buffer) / (GST_SECOND * 60)) % 60),
(guint) ((GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND) % 60),
(guint) (GST_BUFFER_TIMESTAMP (buffer) % GST_SECOND));
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_TFF) ? "tff" : "",
(GST_BUFFER_FLAGS (buffer) & GST_VIDEO_BUFFER_RFF) ? "rff" : "",
(GST_BUFFER_FLAGS (buffer) & GST_VIDEO_BUFFER_ONEFIELD) ? "onefield" :
"");
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 = GST_BUFFER_TIMESTAMP (buffer);
}
format = &formats[interlace->pattern];
if (interlace->stored_fields == 0
&& interlace->phase_index == interlace->pattern_offset
&& GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buffer))) {
interlace->timebase = GST_BUFFER_TIMESTAMP (buffer);
interlace->fields_since_timebase = 0;
}
if (!format->n_fields[interlace->phase_index]) {
interlace->phase_index = 0;
}
current_fields = format->n_fields[interlace->phase_index];
/* increment the phase index */
interlace->phase_index++;
GST_DEBUG ("incoming buffer assigned %d fields", current_fields);
num_fields = interlace->stored_fields + current_fields;
while (num_fields >= 2) {
GstBuffer *output_buffer;
int n_output_fields;
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");
output_buffer = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buffer));
/* take the first field from the stored frame */
copy_field (interlace, output_buffer, interlace->stored_frame,
interlace->field_index);
interlace->stored_fields--;
/* take the second field from the incoming buffer */
copy_field (interlace, output_buffer, buffer, interlace->field_index ^ 1);
current_fields--;
n_output_fields = 2;
} else {
output_buffer =
gst_buffer_make_metadata_writable (gst_buffer_ref (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;
gst_interlace_decorate_buffer (interlace, output_buffer, n_output_fields);
interlace->fields_since_timebase += n_output_fields;
interlace->field_index ^= (n_output_fields & 1);
GST_DEBUG_OBJECT (interlace, "output timestamp %" GST_TIME_FORMAT
" duration %" GST_TIME_FORMAT " flags %04x %s %s %s",
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (output_buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (output_buffer)),
GST_BUFFER_FLAGS (output_buffer),
(GST_BUFFER_FLAGS (output_buffer) & GST_VIDEO_BUFFER_TFF) ? "tff" : "",
(GST_BUFFER_FLAGS (output_buffer) & GST_VIDEO_BUFFER_RFF) ? "rff" : "",
(GST_BUFFER_FLAGS (output_buffer) & GST_VIDEO_BUFFER_ONEFIELD) ?
"onefield" : "");
ret = gst_pad_push (interlace->srcpad, output_buffer);
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (interlace, "Failed to push buffer %p", output_buffer);
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);
}
gst_object_unref (interlace);
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;
}
if (parent_class->change_state)
return parent_class->change_state (element, transition);
return GST_STATE_CHANGE_SUCCESS;
}
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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