/* * Copyright (C) 2014 Collabora Ltd. * Author: Nicolas Dufresne * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include "gstv4l2transform.h" #include "v4l2_calls.h" #include #include #define DEFAULT_PROP_DEVICE "/dev/video10" #define V4L2_TRANSFORM_QUARK \ g_quark_from_static_string("gst-v4l2-transform-info") GST_DEBUG_CATEGORY_STATIC (gst_v4l2_transform_debug); #define GST_CAT_DEFAULT gst_v4l2_transform_debug enum { PROP_0, V4L2_STD_OBJECT_PROPS }; typedef struct { gchar *device; GstCaps *sink_caps; GstCaps *src_caps; } GstV4l2TransformCData; #define gst_v4l2_transform_parent_class parent_class G_DEFINE_ABSTRACT_TYPE (GstV4l2Transform, gst_v4l2_transform, GST_TYPE_BASE_TRANSFORM); static void gst_v4l2_transform_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (object); switch (prop_id) { case PROP_OUTPUT_IO_MODE: gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value, pspec); break; case PROP_CAPTURE_IO_MODE: gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value, pspec); break; /* By default, only set on output */ default: if (!gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value, pspec)) { G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } break; } } static void gst_v4l2_transform_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (object); switch (prop_id) { case PROP_OUTPUT_IO_MODE: gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value, pspec); break; case PROP_CAPTURE_IO_MODE: gst_v4l2_object_get_property_helper (self->v4l2capture, prop_id, value, pspec); break; /* By default read from output */ default: if (!gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value, pspec)) { G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } break; } } static gboolean gst_v4l2_transform_open (GstV4l2Transform * self) { GST_DEBUG_OBJECT (self, "Opening"); if (!gst_v4l2_object_open (self->v4l2output)) goto failure; if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output)) goto failure; self->probed_sinkcaps = gst_v4l2_object_get_caps (self->v4l2output, gst_v4l2_object_get_raw_caps ()); if (gst_caps_is_empty (self->probed_sinkcaps)) goto no_input_format; self->probed_srccaps = gst_v4l2_object_get_caps (self->v4l2capture, gst_v4l2_object_get_raw_caps ()); if (gst_caps_is_empty (self->probed_srccaps)) goto no_output_format; return TRUE; no_input_format: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, (_("Converter on device %s has no supported input format"), self->v4l2output->videodev), (NULL)); goto failure; no_output_format: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, (_("Converter on device %s has no supported output format"), self->v4l2output->videodev), (NULL)); goto failure; failure: if (GST_V4L2_IS_OPEN (self->v4l2output)) gst_v4l2_object_close (self->v4l2output); if (GST_V4L2_IS_OPEN (self->v4l2capture)) gst_v4l2_object_close (self->v4l2capture); gst_caps_replace (&self->probed_srccaps, NULL); gst_caps_replace (&self->probed_sinkcaps, NULL); return FALSE; } static void gst_v4l2_transform_close (GstV4l2Transform * self) { GST_DEBUG_OBJECT (self, "Closing"); gst_v4l2_object_close (self->v4l2output); gst_v4l2_object_close (self->v4l2capture); gst_caps_replace (&self->probed_srccaps, NULL); gst_caps_replace (&self->probed_sinkcaps, NULL); } static gboolean gst_v4l2_transform_stop (GstBaseTransform * trans) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans); GST_DEBUG_OBJECT (self, "Stop"); gst_v4l2_object_stop (self->v4l2output); gst_v4l2_object_stop (self->v4l2capture); gst_caps_replace (&self->incaps, NULL); gst_caps_replace (&self->outcaps, NULL); return TRUE; } static gboolean gst_v4l2_transform_set_caps (GstBaseTransform * trans, GstCaps * incaps, GstCaps * outcaps) { GstV4l2Error error = GST_V4L2_ERROR_INIT; GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans); if (self->incaps && self->outcaps) { if (gst_caps_is_equal (incaps, self->incaps) && gst_caps_is_equal (outcaps, self->outcaps)) { GST_DEBUG_OBJECT (trans, "Caps did not changed"); return TRUE; } } /* TODO Add renegotiation support */ g_return_val_if_fail (!GST_V4L2_IS_ACTIVE (self->v4l2output), FALSE); g_return_val_if_fail (!GST_V4L2_IS_ACTIVE (self->v4l2capture), FALSE); gst_caps_replace (&self->incaps, incaps); gst_caps_replace (&self->outcaps, outcaps); if (!gst_v4l2_object_set_format (self->v4l2output, incaps, &error)) goto incaps_failed; if (!gst_v4l2_object_set_format (self->v4l2capture, outcaps, &error)) goto outcaps_failed; /* FIXME implement fallback if crop not supported */ if (!gst_v4l2_object_set_crop (self->v4l2output)) goto failed; if (!gst_v4l2_object_set_crop (self->v4l2capture)) goto failed; return TRUE; incaps_failed: { GST_ERROR_OBJECT (self, "failed to set input caps: %" GST_PTR_FORMAT, incaps); gst_v4l2_error (self, &error); goto failed; } outcaps_failed: { gst_v4l2_object_stop (self->v4l2output); GST_ERROR_OBJECT (self, "failed to set output caps: %" GST_PTR_FORMAT, outcaps); gst_v4l2_error (self, &error); goto failed; } failed: return FALSE; } static gboolean gst_v4l2_transform_query (GstBaseTransform * trans, GstPadDirection direction, GstQuery * query) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans); gboolean ret = TRUE; switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CAPS:{ GstCaps *filter, *caps = NULL, *result = NULL; GstPad *pad, *otherpad; gst_query_parse_caps (query, &filter); if (direction == GST_PAD_SRC) { pad = GST_BASE_TRANSFORM_SRC_PAD (trans); otherpad = GST_BASE_TRANSFORM_SINK_PAD (trans); if (self->probed_srccaps) caps = gst_caps_ref (self->probed_srccaps); } else { pad = GST_BASE_TRANSFORM_SINK_PAD (trans); otherpad = GST_BASE_TRANSFORM_SRC_PAD (trans); if (self->probed_sinkcaps) caps = gst_caps_ref (self->probed_sinkcaps); } if (!caps) caps = gst_pad_get_pad_template_caps (pad); if (filter) { GstCaps *tmp = caps; caps = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (tmp); } result = gst_pad_peer_query_caps (otherpad, caps); result = gst_caps_make_writable (result); gst_caps_append (result, caps); GST_DEBUG_OBJECT (self, "Returning %s caps %" GST_PTR_FORMAT, GST_PAD_NAME (pad), result); gst_query_set_caps_result (query, result); gst_caps_unref (result); break; } default: ret = GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction, query); break; } return ret; } static gboolean gst_v4l2_transform_decide_allocation (GstBaseTransform * trans, GstQuery * query) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans); gboolean ret = FALSE; GST_DEBUG_OBJECT (self, "called"); if (gst_v4l2_object_decide_allocation (self->v4l2capture, query)) { GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2capture->pool); ret = GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans, query); if (!gst_buffer_pool_set_active (pool, TRUE)) goto activate_failed; } return ret; activate_failed: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, ("failed to activate bufferpool"), ("failed to activate bufferpool")); return TRUE; } static gboolean gst_v4l2_transform_propose_allocation (GstBaseTransform * trans, GstQuery * decide_query, GstQuery * query) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans); gboolean ret = FALSE; GST_DEBUG_OBJECT (self, "called"); if (decide_query == NULL) ret = TRUE; else ret = gst_v4l2_object_propose_allocation (self->v4l2output, query); if (ret) ret = GST_BASE_TRANSFORM_CLASS (parent_class)->propose_allocation (trans, decide_query, query); return ret; } /* copies the given caps */ static GstCaps * gst_v4l2_transform_caps_remove_format_info (GstCaps * caps) { GstStructure *st; GstCapsFeatures *f; gint i, n; GstCaps *res; res = gst_caps_new_empty (); n = gst_caps_get_size (caps); for (i = 0; i < n; i++) { st = gst_caps_get_structure (caps, i); f = gst_caps_get_features (caps, i); /* If this is already expressed by the existing caps * skip this structure */ if (i > 0 && gst_caps_is_subset_structure_full (res, st, f)) continue; st = gst_structure_copy (st); /* Only remove format info for the cases when we can actually convert */ if (!gst_caps_features_is_any (f) && gst_caps_features_is_equal (f, GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY)) gst_structure_remove_fields (st, "format", "colorimetry", "chroma-site", "width", "height", "pixel-aspect-ratio", NULL); gst_caps_append_structure_full (res, st, gst_caps_features_copy (f)); } return res; } /* The caps can be transformed into any other caps with format info removed. * However, we should prefer passthrough, so if passthrough is possible, * put it first in the list. */ static GstCaps * gst_v4l2_transform_transform_caps (GstBaseTransform * btrans, GstPadDirection direction, GstCaps * caps, GstCaps * filter) { GstCaps *tmp, *tmp2; GstCaps *result; /* Get all possible caps that we can transform to */ tmp = gst_v4l2_transform_caps_remove_format_info (caps); if (filter) { tmp2 = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (tmp); tmp = tmp2; } result = tmp; GST_DEBUG_OBJECT (btrans, "transformed %" GST_PTR_FORMAT " into %" GST_PTR_FORMAT, caps, result); return result; } static GstCaps * gst_v4l2_transform_fixate_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps) { GstStructure *ins, *outs; const GValue *from_par, *to_par; GValue fpar = { 0, }, tpar = { 0,}; othercaps = gst_caps_truncate (othercaps); othercaps = gst_caps_make_writable (othercaps); GST_DEBUG_OBJECT (trans, "trying to fixate othercaps %" GST_PTR_FORMAT " based on caps %" GST_PTR_FORMAT, othercaps, caps); ins = gst_caps_get_structure (caps, 0); outs = gst_caps_get_structure (othercaps, 0); { const gchar *in_format; in_format = gst_structure_get_string (ins, "format"); if (in_format) { /* Try to set output format for pass through */ gst_structure_fixate_field_string (outs, "format", in_format); } } from_par = gst_structure_get_value (ins, "pixel-aspect-ratio"); to_par = gst_structure_get_value (outs, "pixel-aspect-ratio"); /* If we're fixating from the sinkpad we always set the PAR and * assume that missing PAR on the sinkpad means 1/1 and * missing PAR on the srcpad means undefined */ if (direction == GST_PAD_SINK) { if (!from_par) { g_value_init (&fpar, GST_TYPE_FRACTION); gst_value_set_fraction (&fpar, 1, 1); from_par = &fpar; } if (!to_par) { g_value_init (&tpar, GST_TYPE_FRACTION_RANGE); gst_value_set_fraction_range_full (&tpar, 1, G_MAXINT, G_MAXINT, 1); to_par = &tpar; } } else { if (!to_par) { g_value_init (&tpar, GST_TYPE_FRACTION); gst_value_set_fraction (&tpar, 1, 1); to_par = &tpar; gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL); } if (!from_par) { g_value_init (&fpar, GST_TYPE_FRACTION); gst_value_set_fraction (&fpar, 1, 1); from_par = &fpar; } } /* we have both PAR but they might not be fixated */ { gint from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d; gint w = 0, h = 0; gint from_dar_n, from_dar_d; gint num, den; /* from_par should be fixed */ g_return_val_if_fail (gst_value_is_fixed (from_par), othercaps); from_par_n = gst_value_get_fraction_numerator (from_par); from_par_d = gst_value_get_fraction_denominator (from_par); gst_structure_get_int (ins, "width", &from_w); gst_structure_get_int (ins, "height", &from_h); gst_structure_get_int (outs, "width", &w); gst_structure_get_int (outs, "height", &h); /* if both width and height are already fixed, we can't do anything * about it anymore */ if (w && h) { guint n, d; GST_DEBUG_OBJECT (trans, "dimensions already set to %dx%d, not fixating", w, h); if (!gst_value_is_fixed (to_par)) { if (gst_video_calculate_display_ratio (&n, &d, from_w, from_h, from_par_n, from_par_d, w, h)) { GST_DEBUG_OBJECT (trans, "fixating to_par to %dx%d", n, d); if (gst_structure_has_field (outs, "pixel-aspect-ratio")) gst_structure_fixate_field_nearest_fraction (outs, "pixel-aspect-ratio", n, d); else if (n != d) gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, n, d, NULL); } } goto done; } /* Calculate input DAR */ if (!gst_util_fraction_multiply (from_w, from_h, from_par_n, from_par_d, &from_dar_n, &from_dar_d)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); goto done; } GST_DEBUG_OBJECT (trans, "Input DAR is %d/%d", from_dar_n, from_dar_d); /* If either width or height are fixed there's not much we * can do either except choosing a height or width and PAR * that matches the DAR as good as possible */ if (h) { GstStructure *tmp; gint set_w, set_par_n, set_par_d; GST_DEBUG_OBJECT (trans, "height is fixed (%d)", h); /* If the PAR is fixed too, there's not much to do * except choosing the width that is nearest to the * width with the same DAR */ if (gst_value_is_fixed (to_par)) { to_par_n = gst_value_get_fraction_numerator (to_par); to_par_d = gst_value_get_fraction_denominator (to_par); GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d); if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d, to_par_n, &num, &den)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); goto done; } w = (guint) gst_util_uint64_scale_int (h, num, den); gst_structure_fixate_field_nearest_int (outs, "width", w); goto done; } /* The PAR is not fixed and it's quite likely that we can set * an arbitrary PAR. */ /* Check if we can keep the input width */ tmp = gst_structure_copy (outs); gst_structure_fixate_field_nearest_int (tmp, "width", from_w); gst_structure_get_int (tmp, "width", &set_w); /* Might have failed but try to keep the DAR nonetheless by * adjusting the PAR */ if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, h, set_w, &to_par_n, &to_par_d)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); gst_structure_free (tmp); goto done; } if (!gst_structure_has_field (tmp, "pixel-aspect-ratio")) gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par); gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio", to_par_n, to_par_d); gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n, &set_par_d); gst_structure_free (tmp); /* Check if the adjusted PAR is accepted */ if (set_par_n == to_par_n && set_par_d == to_par_d) { if (gst_structure_has_field (outs, "pixel-aspect-ratio") || set_par_n != set_par_d) gst_structure_set (outs, "width", G_TYPE_INT, set_w, "pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d, NULL); goto done; } /* Otherwise scale the width to the new PAR and check if the * adjusted with is accepted. If all that fails we can't keep * the DAR */ if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d, set_par_n, &num, &den)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); goto done; } w = (guint) gst_util_uint64_scale_int (h, num, den); gst_structure_fixate_field_nearest_int (outs, "width", w); if (gst_structure_has_field (outs, "pixel-aspect-ratio") || set_par_n != set_par_d) gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d, NULL); goto done; } else if (w) { GstStructure *tmp; gint set_h, set_par_n, set_par_d; GST_DEBUG_OBJECT (trans, "width is fixed (%d)", w); /* If the PAR is fixed too, there's not much to do * except choosing the height that is nearest to the * height with the same DAR */ if (gst_value_is_fixed (to_par)) { to_par_n = gst_value_get_fraction_numerator (to_par); to_par_d = gst_value_get_fraction_denominator (to_par); GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d); if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d, to_par_n, &num, &den)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); goto done; } h = (guint) gst_util_uint64_scale_int (w, den, num); gst_structure_fixate_field_nearest_int (outs, "height", h); goto done; } /* The PAR is not fixed and it's quite likely that we can set * an arbitrary PAR. */ /* Check if we can keep the input height */ tmp = gst_structure_copy (outs); gst_structure_fixate_field_nearest_int (tmp, "height", from_h); gst_structure_get_int (tmp, "height", &set_h); /* Might have failed but try to keep the DAR nonetheless by * adjusting the PAR */ if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_h, w, &to_par_n, &to_par_d)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); gst_structure_free (tmp); goto done; } if (!gst_structure_has_field (tmp, "pixel-aspect-ratio")) gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par); gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio", to_par_n, to_par_d); gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n, &set_par_d); gst_structure_free (tmp); /* Check if the adjusted PAR is accepted */ if (set_par_n == to_par_n && set_par_d == to_par_d) { if (gst_structure_has_field (outs, "pixel-aspect-ratio") || set_par_n != set_par_d) gst_structure_set (outs, "height", G_TYPE_INT, set_h, "pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d, NULL); goto done; } /* Otherwise scale the height to the new PAR and check if the * adjusted with is accepted. If all that fails we can't keep * the DAR */ if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d, set_par_n, &num, &den)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); goto done; } h = (guint) gst_util_uint64_scale_int (w, den, num); gst_structure_fixate_field_nearest_int (outs, "height", h); if (gst_structure_has_field (outs, "pixel-aspect-ratio") || set_par_n != set_par_d) gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d, NULL); goto done; } else if (gst_value_is_fixed (to_par)) { GstStructure *tmp; gint set_h, set_w, f_h, f_w; to_par_n = gst_value_get_fraction_numerator (to_par); to_par_d = gst_value_get_fraction_denominator (to_par); GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d); /* Calculate scale factor for the PAR change */ if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d, to_par_n, &num, &den)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); goto done; } /* Try to keep the input height (because of interlacing) */ tmp = gst_structure_copy (outs); gst_structure_fixate_field_nearest_int (tmp, "height", from_h); gst_structure_get_int (tmp, "height", &set_h); /* This might have failed but try to scale the width * to keep the DAR nonetheless */ w = (guint) gst_util_uint64_scale_int (set_h, num, den); gst_structure_fixate_field_nearest_int (tmp, "width", w); gst_structure_get_int (tmp, "width", &set_w); gst_structure_free (tmp); /* We kept the DAR and the height is nearest to the original height */ if (set_w == w) { gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height", G_TYPE_INT, set_h, NULL); goto done; } f_h = set_h; f_w = set_w; /* If the former failed, try to keep the input width at least */ tmp = gst_structure_copy (outs); gst_structure_fixate_field_nearest_int (tmp, "width", from_w); gst_structure_get_int (tmp, "width", &set_w); /* This might have failed but try to scale the width * to keep the DAR nonetheless */ h = (guint) gst_util_uint64_scale_int (set_w, den, num); gst_structure_fixate_field_nearest_int (tmp, "height", h); gst_structure_get_int (tmp, "height", &set_h); gst_structure_free (tmp); /* We kept the DAR and the width is nearest to the original width */ if (set_h == h) { gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height", G_TYPE_INT, set_h, NULL); goto done; } /* If all this failed, keep the height that was nearest to the orignal * height and the nearest possible width. This changes the DAR but * there's not much else to do here. */ gst_structure_set (outs, "width", G_TYPE_INT, f_w, "height", G_TYPE_INT, f_h, NULL); goto done; } else { GstStructure *tmp; gint set_h, set_w, set_par_n, set_par_d, tmp2; /* width, height and PAR are not fixed but passthrough is not possible */ /* First try to keep the height and width as good as possible * and scale PAR */ tmp = gst_structure_copy (outs); gst_structure_fixate_field_nearest_int (tmp, "height", from_h); gst_structure_get_int (tmp, "height", &set_h); gst_structure_fixate_field_nearest_int (tmp, "width", from_w); gst_structure_get_int (tmp, "width", &set_w); if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_h, set_w, &to_par_n, &to_par_d)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); gst_structure_free (tmp); goto done; } if (!gst_structure_has_field (tmp, "pixel-aspect-ratio")) gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par); gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio", to_par_n, to_par_d); gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n, &set_par_d); gst_structure_free (tmp); if (set_par_n == to_par_n && set_par_d == to_par_d) { gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height", G_TYPE_INT, set_h, NULL); if (gst_structure_has_field (outs, "pixel-aspect-ratio") || set_par_n != set_par_d) gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d, NULL); goto done; } /* Otherwise try to scale width to keep the DAR with the set * PAR and height */ if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d, set_par_n, &num, &den)) { GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL), ("Error calculating the output scaled size - integer overflow")); goto done; } w = (guint) gst_util_uint64_scale_int (set_h, num, den); tmp = gst_structure_copy (outs); gst_structure_fixate_field_nearest_int (tmp, "width", w); gst_structure_get_int (tmp, "width", &tmp2); gst_structure_free (tmp); if (tmp2 == w) { gst_structure_set (outs, "width", G_TYPE_INT, tmp2, "height", G_TYPE_INT, set_h, NULL); if (gst_structure_has_field (outs, "pixel-aspect-ratio") || set_par_n != set_par_d) gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d, NULL); goto done; } /* ... or try the same with the height */ h = (guint) gst_util_uint64_scale_int (set_w, den, num); tmp = gst_structure_copy (outs); gst_structure_fixate_field_nearest_int (tmp, "height", h); gst_structure_get_int (tmp, "height", &tmp2); gst_structure_free (tmp); if (tmp2 == h) { gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height", G_TYPE_INT, tmp2, NULL); if (gst_structure_has_field (outs, "pixel-aspect-ratio") || set_par_n != set_par_d) gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d, NULL); goto done; } /* If all fails we can't keep the DAR and take the nearest values * for everything from the first try */ gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height", G_TYPE_INT, set_h, NULL); if (gst_structure_has_field (outs, "pixel-aspect-ratio") || set_par_n != set_par_d) gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d, NULL); } } done: GST_DEBUG_OBJECT (trans, "fixated othercaps to %" GST_PTR_FORMAT, othercaps); if (from_par == &fpar) g_value_unset (&fpar); if (to_par == &tpar) g_value_unset (&tpar); /* fixate remaining fields */ othercaps = gst_caps_fixate (othercaps); if (direction == GST_PAD_SINK) { if (gst_caps_is_subset (caps, othercaps)) { gst_caps_replace (&othercaps, caps); } } return othercaps; } static GstFlowReturn gst_v4l2_transform_prepare_output_buffer (GstBaseTransform * trans, GstBuffer * inbuf, GstBuffer ** outbuf) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans); GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool); GstFlowReturn ret = GST_FLOW_OK; GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_CLASS (parent_class); if (gst_base_transform_is_passthrough (trans)) { GST_DEBUG_OBJECT (self, "Passthrough, no need to do anything"); *outbuf = inbuf; goto beach; } /* Ensure input internal pool is active */ if (!gst_buffer_pool_is_active (pool)) { GstStructure *config = gst_buffer_pool_get_config (pool); gint min = self->v4l2output->min_buffers == 0 ? GST_V4L2_MIN_BUFFERS : self->v4l2output->min_buffers; gst_buffer_pool_config_set_params (config, self->incaps, self->v4l2output->info.size, min, min); /* There is no reason to refuse this config */ if (!gst_buffer_pool_set_config (pool, config)) goto activate_failed; if (!gst_buffer_pool_set_active (pool, TRUE)) goto activate_failed; } GST_DEBUG_OBJECT (self, "Queue input buffer"); ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), &inbuf); if (G_UNLIKELY (ret != GST_FLOW_OK)) goto beach; do { pool = gst_base_transform_get_buffer_pool (trans); if (!gst_buffer_pool_set_active (pool, TRUE)) goto activate_failed; GST_DEBUG_OBJECT (self, "Dequeue output buffer"); ret = gst_buffer_pool_acquire_buffer (pool, outbuf, NULL); g_object_unref (pool); if (ret != GST_FLOW_OK) goto alloc_failed; pool = self->v4l2capture->pool; ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), outbuf); } while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER); if (ret != GST_FLOW_OK) { gst_buffer_unref (*outbuf); *outbuf = NULL; } if (bclass->copy_metadata) if (!bclass->copy_metadata (trans, inbuf, *outbuf)) { /* something failed, post a warning */ GST_ELEMENT_WARNING (self, STREAM, NOT_IMPLEMENTED, ("could not copy metadata"), (NULL)); } beach: return ret; activate_failed: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, ("failed to activate bufferpool"), ("failed to activate bufferpool")); g_object_unref (pool); return GST_FLOW_ERROR; alloc_failed: GST_DEBUG_OBJECT (self, "could not allocate buffer from pool"); return ret; } static GstFlowReturn gst_v4l2_transform_transform (GstBaseTransform * trans, GstBuffer * inbuf, GstBuffer * outbuf) { /* Nothing to do */ return GST_FLOW_OK; } static gboolean gst_v4l2_transform_sink_event (GstBaseTransform * trans, GstEvent * event) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans); gboolean ret; /* Nothing to flush in passthrough */ if (gst_base_transform_is_passthrough (trans)) return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: GST_DEBUG_OBJECT (self, "flush start"); gst_v4l2_object_unlock (self->v4l2output); gst_v4l2_object_unlock (self->v4l2capture); break; default: break; } ret = GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_STOP: /* Buffer should be back now */ GST_DEBUG_OBJECT (self, "flush stop"); gst_v4l2_object_unlock_stop (self->v4l2capture); gst_v4l2_object_unlock_stop (self->v4l2output); break; default: break; } return ret; } static GstStateChangeReturn gst_v4l2_transform_change_state (GstElement * element, GstStateChange transition) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (element); GstStateChangeReturn ret; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: if (!gst_v4l2_transform_open (self)) return GST_STATE_CHANGE_FAILURE; break; case GST_STATE_CHANGE_PAUSED_TO_READY: gst_v4l2_object_unlock (self->v4l2output); gst_v4l2_object_unlock (self->v4l2capture); break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_READY_TO_NULL: gst_v4l2_transform_close (self); break; default: break; } return ret; } static void gst_v4l2_transform_dispose (GObject * object) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (object); gst_caps_replace (&self->probed_sinkcaps, NULL); gst_caps_replace (&self->probed_srccaps, NULL); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_v4l2_transform_finalize (GObject * object) { GstV4l2Transform *self = GST_V4L2_TRANSFORM (object); gst_v4l2_object_destroy (self->v4l2capture); gst_v4l2_object_destroy (self->v4l2output); G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_v4l2_transform_init (GstV4l2Transform * self) { /* V4L2 object are created in subinstance_init */ /* enable QoS */ gst_base_transform_set_qos_enabled (GST_BASE_TRANSFORM (self), TRUE); } static void gst_v4l2_transform_subinstance_init (GTypeInstance * instance, gpointer g_class) { GstV4l2TransformClass *klass = GST_V4L2_TRANSFORM_CLASS (g_class); GstV4l2Transform *self = GST_V4L2_TRANSFORM (instance); self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self), V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device, gst_v4l2_get_output, gst_v4l2_set_output, NULL); self->v4l2output->no_initial_format = TRUE; self->v4l2output->keep_aspect = FALSE; self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self), V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device, gst_v4l2_get_input, gst_v4l2_set_input, NULL); self->v4l2capture->no_initial_format = TRUE; self->v4l2output->keep_aspect = FALSE; } static void gst_v4l2_transform_class_init (GstV4l2TransformClass * klass) { GstElementClass *element_class; GObjectClass *gobject_class; GstBaseTransformClass *base_transform_class; element_class = (GstElementClass *) klass; gobject_class = (GObjectClass *) klass; base_transform_class = (GstBaseTransformClass *) klass; GST_DEBUG_CATEGORY_INIT (gst_v4l2_transform_debug, "v4l2transform", 0, "V4L2 Converter"); gst_element_class_set_static_metadata (element_class, "V4L2 Video Converter", "Filter/Converter/Video/Scaler", "Transform streams via V4L2 API", "Nicolas Dufresne "); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_transform_dispose); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_transform_finalize); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_v4l2_transform_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_v4l2_transform_get_property); base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_transform_stop); base_transform_class->set_caps = GST_DEBUG_FUNCPTR (gst_v4l2_transform_set_caps); base_transform_class->query = GST_DEBUG_FUNCPTR (gst_v4l2_transform_query); base_transform_class->sink_event = GST_DEBUG_FUNCPTR (gst_v4l2_transform_sink_event); base_transform_class->decide_allocation = GST_DEBUG_FUNCPTR (gst_v4l2_transform_decide_allocation); base_transform_class->propose_allocation = GST_DEBUG_FUNCPTR (gst_v4l2_transform_propose_allocation); base_transform_class->transform_caps = GST_DEBUG_FUNCPTR (gst_v4l2_transform_transform_caps); base_transform_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_v4l2_transform_fixate_caps); base_transform_class->prepare_output_buffer = GST_DEBUG_FUNCPTR (gst_v4l2_transform_prepare_output_buffer); base_transform_class->transform = GST_DEBUG_FUNCPTR (gst_v4l2_transform_transform); base_transform_class->passthrough_on_same_caps = TRUE; element_class->change_state = GST_DEBUG_FUNCPTR (gst_v4l2_transform_change_state); gst_v4l2_object_install_m2m_properties_helper (gobject_class); } static void gst_v4l2_transform_subclass_init (gpointer g_class, gpointer data) { GstV4l2TransformClass *klass = GST_V4L2_TRANSFORM_CLASS (g_class); GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); GstV4l2TransformCData *cdata = data; klass->default_device = cdata->device; /* Note: gst_pad_template_new() take the floating ref from the caps */ gst_element_class_add_pad_template (element_class, gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, cdata->sink_caps)); gst_element_class_add_pad_template (element_class, gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, cdata->src_caps)); g_free (cdata); } /* Probing functions */ gboolean gst_v4l2_is_transform (GstCaps * sink_caps, GstCaps * src_caps) { gboolean ret = FALSE; if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ()) && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ())) ret = TRUE; return ret; } gboolean gst_v4l2_transform_register (GstPlugin * plugin, const gchar * basename, const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps) { GTypeQuery type_query; GTypeInfo type_info = { 0, }; GType type, subtype; gchar *type_name; GstV4l2TransformCData *cdata; cdata = g_new0 (GstV4l2TransformCData, 1); cdata->device = g_strdup (device_path); cdata->sink_caps = gst_caps_ref (sink_caps); cdata->src_caps = gst_caps_ref (src_caps); type = gst_v4l2_transform_get_type (); g_type_query (type, &type_query); memset (&type_info, 0, sizeof (type_info)); type_info.class_size = type_query.class_size; type_info.instance_size = type_query.instance_size; type_info.class_init = gst_v4l2_transform_subclass_init; type_info.class_data = cdata; type_info.instance_init = gst_v4l2_transform_subinstance_init; type_name = g_strdup_printf ("v4l2%sconvert", basename); subtype = g_type_register_static (type, type_name, &type_info, 0); gst_element_register (plugin, type_name, GST_RANK_NONE, subtype); g_free (type_name); return TRUE; }