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v4l2: add alternate interlace mode
When using this mode each frame is split in two fields, each one being transferred using its own buffer. This is implemented with the V4L2_FIELD_ALTERNATE field format in v4l2. This mode is enabled using a caps filter such as "v4l2src ! video/x-raw\(format:Interlaced\)" Here are the main changes related to this feature: - use the INTERLACED caps feature with this mode. - in this mode both fields of a given frame have the same sequence/offset so adjust the algorithm checking for lost field/frame accordingly. - double pool's min number of buffers as each frame requires 2 buffers. Fix #504 Co-authored-by: Zeeshan Ali <zeenix@collabora.co.uk>
This commit is contained in:
Guillaume Desmottes
Guillaume Desmottes
parent
0834ef15ce
commit
d1501f0952
5 changed files with 184 additions and 47 deletions
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@ -1149,22 +1149,12 @@ gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf,
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if (V4L2_TYPE_IS_OUTPUT (obj->type)) {
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enum v4l2_field field;
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/* Except when field is set to alternate, buffer field is the same as
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* the one defined in format */
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/* Buffer field is the same as the one defined in format */
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if (V4L2_TYPE_IS_MULTIPLANAR (obj->type))
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field = obj->format.fmt.pix_mp.field;
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else
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field = obj->format.fmt.pix.field;
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/* NB: At this moment, we can't have alternate mode because it not handled
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* yet */
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if (field == V4L2_FIELD_ALTERNATE) {
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if (GST_BUFFER_FLAG_IS_SET (buf, GST_VIDEO_FRAME_FLAG_TFF))
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field = V4L2_FIELD_TOP;
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else
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field = V4L2_FIELD_BOTTOM;
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}
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group->buffer.field = field;
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}
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@ -1303,6 +1293,14 @@ gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool, GstBuffer ** buffer,
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GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
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GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
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break;
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case V4L2_FIELD_TOP:
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GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
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GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_TOP_FIELD);
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break;
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case V4L2_FIELD_BOTTOM:
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GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
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GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_BOTTOM_FIELD);
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break;
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case V4L2_FIELD_INTERLACED_TB:
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GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
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GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
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@ -1617,6 +1617,25 @@ done:
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return template;
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}
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/* Add an 'alternate' variant of the caps with the feature */
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static void
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add_alternate_variant (GstV4l2Object * v4l2object, GstCaps * caps,
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GstStructure * structure)
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{
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GstStructure *alt_s;
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if (v4l2object && v4l2object->never_interlaced)
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return;
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if (!gst_structure_has_name (structure, "video/x-raw"))
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return;
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alt_s = gst_structure_copy (structure);
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gst_structure_set (alt_s, "interlace-mode", G_TYPE_STRING, "alternate", NULL);
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gst_caps_append_structure_full (caps, alt_s,
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gst_caps_features_new (GST_CAPS_FEATURE_FORMAT_INTERLACED, NULL));
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}
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static GstCaps *
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gst_v4l2_object_get_caps_helper (GstV4L2FormatFlags flags)
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@ -1660,6 +1679,8 @@ gst_v4l2_object_get_caps_helper (GstV4L2FormatFlags flags)
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if (alt_s)
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gst_caps_append_structure (caps, alt_s);
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add_alternate_variant (NULL, caps, structure);
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}
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}
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@ -1984,6 +2005,9 @@ gst_v4l2_object_get_interlace_mode (enum v4l2_field field,
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case V4L2_FIELD_INTERLACED_BT:
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*interlace_mode = GST_VIDEO_INTERLACE_MODE_INTERLEAVED;
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return TRUE;
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case V4L2_FIELD_ALTERNATE:
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*interlace_mode = GST_VIDEO_INTERLACE_MODE_ALTERNATE;
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return TRUE;
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default:
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GST_ERROR ("Unknown enum v4l2_field %d", field);
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return FALSE;
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@ -2214,7 +2238,9 @@ gst_v4l2_object_add_interlace_mode (GstV4l2Object * v4l2object,
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{
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struct v4l2_format fmt;
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GValue interlace_formats = { 0, };
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enum v4l2_field formats[] = { V4L2_FIELD_NONE, V4L2_FIELD_INTERLACED };
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enum v4l2_field formats[] = { V4L2_FIELD_NONE,
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V4L2_FIELD_INTERLACED, V4L2_FIELD_ALTERNATE
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};
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gsize i;
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GstVideoInterlaceMode interlace_mode, prev = -1;
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@ -2228,7 +2254,7 @@ gst_v4l2_object_add_interlace_mode (GstV4l2Object * v4l2object,
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g_value_init (&interlace_formats, GST_TYPE_LIST);
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/* Try twice - once for NONE, once for INTERLACED. */
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/* Try thrice - once for NONE, once for INTERLACED and once for ALTERNATE. */
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for (i = 0; i < G_N_ELEMENTS (formats); i++) {
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memset (&fmt, 0, sizeof (fmt));
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fmt.type = v4l2object->type;
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@ -2237,8 +2263,19 @@ gst_v4l2_object_add_interlace_mode (GstV4l2Object * v4l2object,
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fmt.fmt.pix.pixelformat = pixelformat;
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fmt.fmt.pix.field = formats[i];
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if (gst_v4l2_object_try_fmt (v4l2object, &fmt) == 0 &&
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gst_v4l2_object_get_interlace_mode (fmt.fmt.pix.field, &interlace_mode)
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if (fmt.fmt.pix.field == V4L2_FIELD_ALTERNATE)
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fmt.fmt.pix.height /= 2;
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/* if skip_try_fmt_probes is set it's up to the caller to filter out the
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* formats from the formats requested by peer.
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* For this negotiation to work with 'alternate' we need the caps to contain
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* the feature so we have an intersection with downstream caps.
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*/
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if (!v4l2object->skip_try_fmt_probes
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&& gst_v4l2_object_try_fmt (v4l2object, &fmt) != 0)
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continue;
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if (gst_v4l2_object_get_interlace_mode (fmt.fmt.pix.field, &interlace_mode)
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&& prev != interlace_mode) {
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GValue interlace_enum = { 0, };
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const gchar *mode_string;
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@ -2574,6 +2611,54 @@ sort_by_frame_size (GstStructure * s1, GstStructure * s2)
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return ((w2 * h2) - (w1 * h1));
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}
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static void
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check_alternate_and_append_struct (GstCaps * caps, GstStructure * s)
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{
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const GValue *mode;
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mode = gst_structure_get_value (s, "interlace-mode");
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if (!mode)
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goto done;
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if (G_VALUE_HOLDS_STRING (mode)) {
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/* Add the INTERLACED feature if the mode is alternate */
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if (!g_strcmp0 (gst_structure_get_string (s, "interlace-mode"),
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"alternate")) {
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GstCapsFeatures *feat;
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feat = gst_caps_features_new (GST_CAPS_FEATURE_FORMAT_INTERLACED, NULL);
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gst_caps_set_features (caps, gst_caps_get_size (caps) - 1, feat);
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}
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} else if (GST_VALUE_HOLDS_LIST (mode)) {
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/* If the mode is a list containing alternate, remove it from the list and add a
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* variant with interlace-mode=alternate and the INTERLACED feature. */
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GValue alter = G_VALUE_INIT;
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GValue inter = G_VALUE_INIT;
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g_value_init (&alter, G_TYPE_STRING);
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g_value_set_string (&alter, "alternate");
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/* Cannot use gst_value_can_intersect() as it requires args to have the
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* same type. */
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if (gst_value_intersect (&inter, mode, &alter)) {
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GValue minus_alter = G_VALUE_INIT;
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GstStructure *copy;
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gst_value_subtract (&minus_alter, mode, &alter);
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gst_structure_take_value (s, "interlace-mode", &minus_alter);
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copy = gst_structure_copy (s);
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gst_structure_take_value (copy, "interlace-mode", &inter);
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gst_caps_append_structure_full (caps, copy,
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gst_caps_features_new (GST_CAPS_FEATURE_FORMAT_INTERLACED, NULL));
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}
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g_value_unset (&alter);
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}
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done:
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gst_caps_append_structure (caps, s);
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}
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static void
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gst_v4l2_object_update_and_append (GstV4l2Object * v4l2object,
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guint32 format, GstCaps * caps, GstStructure * s)
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@ -2612,10 +2697,11 @@ gst_v4l2_object_update_and_append (GstV4l2Object * v4l2object,
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}
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}
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gst_caps_append_structure (caps, s);
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check_alternate_and_append_struct (caps, s);
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if (alt_s)
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gst_caps_append_structure (caps, alt_s);
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if (alt_s) {
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check_alternate_and_append_struct (caps, alt_s);
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}
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}
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static GstCaps *
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@ -2850,10 +2936,11 @@ default_frame_sizes:
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gst_v4l2_object_add_aspect_ratio (v4l2object, tmp);
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/* We could consider setting interlace mode from min and max. */
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gst_v4l2_object_add_interlace_mode (v4l2object, tmp, max_w, max_h,
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pixelformat);
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if (!v4l2object->skip_try_fmt_probes) {
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/* We could consider setting interlace mode from min and max. */
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gst_v4l2_object_add_interlace_mode (v4l2object, tmp, max_w, max_h,
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pixelformat);
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/* We could consider to check colorspace for min too, in case it depends on
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* the size. But in this case, min and max could not be enough */
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gst_v4l2_object_add_colorspace (v4l2object, tmp, max_w, max_h,
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@ -3220,6 +3307,9 @@ store_info:
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if (info->fps_n > 0 && info->fps_d > 0) {
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v4l2object->duration = gst_util_uint64_scale_int (GST_SECOND, info->fps_d,
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info->fps_n);
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if (GST_VIDEO_INFO_INTERLACE_MODE (info) ==
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GST_VIDEO_INTERLACE_MODE_ALTERNATE)
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v4l2object->duration /= 2;
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} else {
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v4l2object->duration = GST_CLOCK_TIME_NONE;
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}
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@ -3249,6 +3339,27 @@ gst_v4l2_object_extrapolate_stride (const GstVideoFormatInfo * finfo,
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return estride;
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}
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static enum v4l2_field
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get_v4l2_field_for_info (GstVideoInfo * info)
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{
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if (!GST_VIDEO_INFO_IS_INTERLACED (info))
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return V4L2_FIELD_NONE;
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if (GST_VIDEO_INFO_INTERLACE_MODE (info) ==
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GST_VIDEO_INTERLACE_MODE_ALTERNATE)
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return V4L2_FIELD_ALTERNATE;
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switch (GST_VIDEO_INFO_FIELD_ORDER (info)) {
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case GST_VIDEO_FIELD_ORDER_TOP_FIELD_FIRST:
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return V4L2_FIELD_INTERLACED_TB;
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case GST_VIDEO_FIELD_ORDER_BOTTOM_FIELD_FIRST:
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return V4L2_FIELD_INTERLACED_BT;
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case GST_VIDEO_FIELD_ORDER_UNKNOWN:
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default:
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return V4L2_FIELD_INTERLACED;
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}
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}
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static gboolean
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gst_v4l2_video_colorimetry_matches (const GstVideoColorimetry * cinfo,
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const gchar * color)
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@ -3356,16 +3467,11 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
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if (!n_v4l_planes || !v4l2object->prefered_non_contiguous)
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n_v4l_planes = 1;
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if (GST_VIDEO_INFO_IS_INTERLACED (&info)) {
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GST_DEBUG_OBJECT (v4l2object->dbg_obj, "interlaced video");
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/* ideally we would differentiate between types of interlaced video
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* but there is not sufficient information in the caps..
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*/
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field = V4L2_FIELD_INTERLACED;
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} else {
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GST_DEBUG_OBJECT (v4l2object->dbg_obj, "progressive video");
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field = V4L2_FIELD_NONE;
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}
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field = get_v4l2_field_for_info (&info);
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if (field != V4L2_FIELD_NONE)
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GST_DEBUG_OBJECT (v4l2object->element, "interlaced video");
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else
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GST_DEBUG_OBJECT (v4l2object->element, "progressive video");
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/* We first pick the main colorspace from the primaries */
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switch (info.colorimetry.primaries) {
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@ -3675,17 +3781,13 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
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}
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/* In case we have skipped the try_fmt probes, we'll need to set the
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* colorimetry and interlace-mode back into the caps. */
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* colorimetry back into the caps. */
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if (v4l2object->skip_try_fmt_probes) {
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if (!disable_colorimetry && !gst_structure_has_field (s, "colorimetry")) {
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gchar *str = gst_video_colorimetry_to_string (&info.colorimetry);
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gst_structure_set (s, "colorimetry", G_TYPE_STRING, str, NULL);
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g_free (str);
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}
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if (!gst_structure_has_field (s, "interlace-mode"))
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gst_structure_set (s, "interlace-mode", G_TYPE_STRING,
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gst_video_interlace_mode_to_string (info.interlace_mode), NULL);
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}
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if (try_only) /* good enough for trying only */
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@ -3989,6 +4091,7 @@ gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object, GstVideoInfo * info)
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GstVideoFormat format;
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guint width, height;
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GstVideoAlignment align;
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GstVideoInterlaceMode interlace_mode;
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gst_video_info_init (info);
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gst_video_alignment_reset (&align);
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@ -4038,22 +4141,26 @@ gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object, GstVideoInfo * info)
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height = r->height;
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}
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gst_video_info_set_format (info, format, width, height);
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switch (fmt.fmt.pix.field) {
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case V4L2_FIELD_ANY:
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case V4L2_FIELD_NONE:
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info->interlace_mode = GST_VIDEO_INTERLACE_MODE_PROGRESSIVE;
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interlace_mode = GST_VIDEO_INTERLACE_MODE_PROGRESSIVE;
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break;
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case V4L2_FIELD_INTERLACED:
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case V4L2_FIELD_INTERLACED_TB:
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case V4L2_FIELD_INTERLACED_BT:
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info->interlace_mode = GST_VIDEO_INTERLACE_MODE_INTERLEAVED;
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interlace_mode = GST_VIDEO_INTERLACE_MODE_INTERLEAVED;
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break;
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case V4L2_FIELD_ALTERNATE:
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interlace_mode = GST_VIDEO_INTERLACE_MODE_ALTERNATE;
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break;
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default:
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goto unsupported_field;
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}
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gst_video_info_set_interlaced_format (info, format, interlace_mode, width,
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height);
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gst_v4l2_object_get_colorspace (&fmt, &info->colorimetry);
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gst_v4l2_object_save_format (v4l2object, fmtdesc, &fmt, info, &align);
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@ -4322,9 +4429,14 @@ gst_v4l2_object_probe_caps (GstV4l2Object * v4l2object, GstCaps * filter)
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tmp = gst_v4l2_object_probe_caps_for_format (v4l2object,
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format->pixelformat, template);
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if (tmp)
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if (tmp) {
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gst_caps_append (ret, tmp);
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/* Add a variant of the caps with the Interlaced feature so we can negotiate it if needed */
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add_alternate_variant (v4l2object, ret, gst_caps_get_structure (ret,
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gst_caps_get_size (ret) - 1));
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}
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gst_structure_free (template);
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}
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@ -42,8 +42,12 @@ typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
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#include <gstv4l2bufferpool.h>
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/* size of v4l2 buffer pool in streaming case */
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#define GST_V4L2_MIN_BUFFERS(obj) 2
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/* size of v4l2 buffer pool in streaming case, obj->info needs to be valid */
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#define GST_V4L2_MIN_BUFFERS(obj) \
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((GST_VIDEO_INFO_INTERLACE_MODE (&obj->info) == \
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GST_VIDEO_INTERLACE_MODE_ALTERNATE) ? \
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/* 2x buffers needed with each field in its own buffer */ \
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4 : 2)
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/* max frame width/height */
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#define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */
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@ -696,8 +696,11 @@ gst_v4l2src_query (GstBaseSrc * bsrc, GstQuery * query)
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goto done;
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}
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/* min latency is the time to capture one frame */
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/* min latency is the time to capture one frame/field */
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min_latency = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
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if (GST_VIDEO_INFO_INTERLACE_MODE (&obj->info) ==
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GST_VIDEO_INTERLACE_MODE_ALTERNATE)
|
||||
min_latency /= 2;
|
||||
|
||||
/* max latency is total duration of the frame buffer */
|
||||
if (obj->pool != NULL)
|
||||
|
|
@ -739,6 +742,7 @@ gst_v4l2src_start (GstBaseSrc * src)
|
|||
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
|
||||
|
||||
v4l2src->offset = 0;
|
||||
v4l2src->next_offset_same = FALSE;
|
||||
v4l2src->renegotiation_adjust = 0;
|
||||
|
||||
/* activate settings for first frame */
|
||||
|
|
@ -828,6 +832,7 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
|
|||
GstClockTime abs_time, base_time, timestamp, duration;
|
||||
GstClockTime delay;
|
||||
GstMessage *qos_msg;
|
||||
gboolean half_frame;
|
||||
|
||||
do {
|
||||
ret = GST_BASE_SRC_CLASS (parent_class)->alloc (GST_BASE_SRC (src), 0,
|
||||
|
|
@ -920,7 +925,7 @@ retry:
|
|||
" delay %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp),
|
||||
GST_TIME_ARGS (gstnow), GST_TIME_ARGS (delay));
|
||||
} else {
|
||||
/* we assume 1 frame latency otherwise */
|
||||
/* we assume 1 frame/field latency otherwise */
|
||||
if (GST_CLOCK_TIME_IS_VALID (duration))
|
||||
delay = duration;
|
||||
else
|
||||
|
|
@ -956,12 +961,28 @@ retry:
|
|||
GST_LOG_OBJECT (src, "sync to %" GST_TIME_FORMAT " out ts %" GST_TIME_FORMAT,
|
||||
GST_TIME_ARGS (v4l2src->ctrl_time), GST_TIME_ARGS (timestamp));
|
||||
|
||||
if (v4l2src->next_offset_same &&
|
||||
GST_BUFFER_OFFSET_IS_VALID (*buf) &&
|
||||
GST_BUFFER_OFFSET (*buf) != v4l2src->offset) {
|
||||
/* Probably had a lost field then, best to forget about last field. */
|
||||
GST_WARNING_OBJECT (v4l2src,
|
||||
"lost field detected - ts: %" GST_TIME_FORMAT,
|
||||
GST_TIME_ARGS (timestamp));
|
||||
v4l2src->next_offset_same = FALSE;
|
||||
}
|
||||
|
||||
half_frame = (GST_BUFFER_FLAG_IS_SET (*buf, GST_VIDEO_BUFFER_FLAG_ONEFIELD));
|
||||
if (half_frame)
|
||||
v4l2src->next_offset_same = !v4l2src->next_offset_same;
|
||||
|
||||
/* use generated offset values only if there are not already valid ones
|
||||
* set by the v4l2 device */
|
||||
if (!GST_BUFFER_OFFSET_IS_VALID (*buf)
|
||||
|| !GST_BUFFER_OFFSET_END_IS_VALID (*buf)) {
|
||||
GST_BUFFER_OFFSET (*buf) = v4l2src->offset++;
|
||||
GST_BUFFER_OFFSET_END (*buf) = v4l2src->offset;
|
||||
GST_BUFFER_OFFSET (*buf) = v4l2src->offset;
|
||||
GST_BUFFER_OFFSET_END (*buf) = v4l2src->offset + 1;
|
||||
if (!half_frame || !v4l2src->next_offset_same)
|
||||
v4l2src->offset++;
|
||||
} else {
|
||||
/* adjust raw v4l2 device sequence, will restart at null in case of renegotiation
|
||||
* (streamoff/streamon) */
|
||||
|
|
@ -969,6 +990,7 @@ retry:
|
|||
GST_BUFFER_OFFSET_END (*buf) += v4l2src->renegotiation_adjust;
|
||||
/* check for frame loss with given (from v4l2 device) buffer offset */
|
||||
if ((v4l2src->offset != 0)
|
||||
&& (!half_frame || v4l2src->next_offset_same)
|
||||
&& (GST_BUFFER_OFFSET (*buf) != (v4l2src->offset + 1))) {
|
||||
guint64 lost_frame_count = GST_BUFFER_OFFSET (*buf) - v4l2src->offset - 1;
|
||||
GST_WARNING_OBJECT (v4l2src,
|
||||
|
|
|
|||
|
|
@ -56,6 +56,7 @@ struct _GstV4l2Src
|
|||
GstV4l2Object * v4l2object;
|
||||
|
||||
guint64 offset;
|
||||
gboolean next_offset_same;
|
||||
|
||||
/* offset adjust after renegotiation */
|
||||
guint64 renegotiation_adjust;
|
||||
|
|
|
|||
Loading…
Reference in a new issue