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interlace: Add pattern offset property

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This property allows one to start at any point within the field pattern after
a discontinuity (whenever gst_interlace_reset () is called). Thus with the
2:3:3:2 pattern, for example, one can start at offset 2 and achieve 3:2:2:3
or offset 1 and achieve 3:3:2:2.
This commit is contained in:
Robert Swain 2010-11-22 10:27:22 +01:00
parent 5c2f805199
commit bea13ef43b
1 changed files with 23 additions and 6 deletions
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29
gst/interlace/gstinterlace.c
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@ -106,7 +106,7 @@ struct _GstInterlace
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
@ -119,6 +119,7 @@ enum
PROP_0,
PROP_TOP_FIELD_FIRST,
PROP_PATTERN,
PROP_PATTERN_OFFSET,
PROP_ALLOW_RFF
};
@ -255,6 +256,11 @@ gst_interlace_class_init (GstInterlaceClass * klass)
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",
@ -265,7 +271,7 @@ gst_interlace_class_init (GstInterlaceClass * klass)
static void
gst_interlace_reset (GstInterlace * interlace)
{
interlace->phase_index = 0;
interlace->phase_index = interlace->pattern_offset;
interlace->timebase = GST_CLOCK_TIME_NONE;
interlace->field_index = 0;
}
@ -291,6 +297,7 @@ gst_interlace_init (GstInterlace * interlace)
interlace->top_field_first = FALSE;
interlace->allow_rff = FALSE;
interlace->pattern = GST_INTERLACE_PATTERN_2_3;
interlace->pattern_offset = 0;
gst_interlace_reset (interlace);
}
@ -498,6 +505,8 @@ gst_interlace_setcaps (GstPad * pad, GstCaps * caps)
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;
@ -664,18 +673,20 @@ gst_interlace_chain (GstPad * pad, GstBuffer * buffer)
format = &formats[interlace->pattern];
if (interlace->stored_fields == 0 && interlace->phase_index == 0
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;
}
current_fields = format->n_fields[interlace->phase_index];
/* increment the phase index */
interlace->phase_index++;
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;
@ -769,6 +780,9 @@ gst_interlace_set_property (GObject * object,
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;
@ -791,6 +805,9 @@ gst_interlace_get_property (GObject * object,
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;