/* GStreamer * Copyright (C) 2021 Daniel Almeida * * 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 #endif #include "gstv4l2codecallocator.h" #include "gstv4l2codecalphadecodebin.h" #include "gstv4l2codecpool.h" #include "gstv4l2codecvp9dec.h" #include "gstv4l2format.h" #include "linux/v4l2-controls.h" #include "linux/videodev2.h" GST_DEBUG_CATEGORY_STATIC (v4l2_vp9dec_debug); #define GST_CAT_DEFAULT v4l2_vp9dec_debug /* Used to mark picture that have been outputed */ #define FLAG_PICTURE_HOLDS_BUFFER GST_MINI_OBJECT_FLAG_LAST enum { PROP_0, PROP_LAST = PROP_0 }; static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE (GST_VIDEO_DECODER_SINK_NAME, GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-vp9, " "alignment=(string) frame") ); static GstStaticPadTemplate alpha_template = GST_STATIC_PAD_TEMPLATE (GST_VIDEO_DECODER_SINK_NAME, GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-vp9, codec-alpha = (boolean) true, " "alignment = frame") ); static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE (GST_VIDEO_DECODER_SRC_NAME, GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (GST_V4L2_DEFAULT_VIDEO_FORMATS))); struct _GstV4l2CodecVp9Dec { GstVp9Decoder parent; GstV4l2Decoder *decoder; GstVideoCodecState *output_state; GstVideoInfo vinfo; gint width; gint height; GstV4l2CodecAllocator *sink_allocator; GstV4l2CodecAllocator *src_allocator; GstV4l2CodecPool *src_pool; gboolean has_videometa; gboolean streaming; gboolean copy_frames; struct v4l2_ctrl_vp9_frame v4l2_vp9_frame; struct v4l2_ctrl_vp9_compressed_hdr v4l2_delta_probs; GstMemory *bitstream; GstMapInfo bitstream_map; /* will renegotiate if parser reports new values */ guint bit_depth; guint color_range; guint profile; guint color_space; guint subsampling_x; guint subsampling_y; }; G_DEFINE_ABSTRACT_TYPE (GstV4l2CodecVp9Dec, gst_v4l2_codec_vp9_dec, GST_TYPE_VP9_DECODER); #define parent_class gst_v4l2_codec_vp9_dec_parent_class static guint gst_v4l2_codec_vp9_dec_get_preferred_output_delay (GstVp9Decoder * decoder, gboolean is_live) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); guint delay; if (is_live) delay = 0; else delay = 1; gst_v4l2_decoder_set_render_delay (self->decoder, delay); return delay; } static void gst_v4l2_codec_vp9_dec_fill_lf_params (GstV4l2CodecVp9Dec * self, const GstVp9LoopFilterParams * lf) { gint i; G_STATIC_ASSERT (sizeof (self->v4l2_vp9_frame.lf.ref_deltas) == sizeof (lf->loop_filter_ref_deltas)); G_STATIC_ASSERT (sizeof (self->v4l2_vp9_frame.lf.mode_deltas) == sizeof (lf->loop_filter_mode_deltas)); for (i = 0; i < G_N_ELEMENTS (self->v4l2_vp9_frame.lf.ref_deltas); i++) self->v4l2_vp9_frame.lf.ref_deltas[i] = lf->loop_filter_ref_deltas[i]; for (i = 0; i < G_N_ELEMENTS (self->v4l2_vp9_frame.lf.mode_deltas); i++) self->v4l2_vp9_frame.lf.mode_deltas[i] = lf->loop_filter_mode_deltas[i]; } static void gst_v4l2_codec_vp9_dec_fill_seg_params (GstV4l2CodecVp9Dec * self, const GstVp9SegmentationParams * s) { guint i; struct v4l2_vp9_segmentation *v4l2_segmentation = &self->v4l2_vp9_frame.seg; G_STATIC_ASSERT (sizeof (v4l2_segmentation->tree_probs) == sizeof (s->segmentation_tree_probs)); G_STATIC_ASSERT (sizeof (v4l2_segmentation->pred_probs) == sizeof (s->segmentation_pred_prob)); G_STATIC_ASSERT (sizeof (v4l2_segmentation->feature_data) == sizeof (s->feature_data)); for (i = 0; i < G_N_ELEMENTS (v4l2_segmentation->tree_probs); i++) { v4l2_segmentation->tree_probs[i] = s->segmentation_tree_probs[i]; } for (i = 0; i < G_N_ELEMENTS (v4l2_segmentation->pred_probs); i++) { v4l2_segmentation->pred_probs[i] = s->segmentation_pred_prob[i]; } for (i = 0; i < G_N_ELEMENTS (v4l2_segmentation->feature_enabled); i++) { /* see 3. Symbols (and abbreviated terms) for reference */ /* *INDENT-OFF* */ v4l2_segmentation->feature_enabled[i] = (s->feature_enabled[i][GST_VP9_SEG_LVL_ALT_Q] ? V4L2_VP9_SEGMENT_FEATURE_ENABLED(V4L2_VP9_SEG_LVL_ALT_Q) : 0) | (s->feature_enabled[i][GST_VP9_SEG_LVL_ALT_L] ? V4L2_VP9_SEGMENT_FEATURE_ENABLED(V4L2_VP9_SEG_LVL_ALT_L) : 0) | (s->feature_enabled[i][GST_VP9_SEG_LVL_REF_FRAME] ? V4L2_VP9_SEGMENT_FEATURE_ENABLED(V4L2_VP9_SEG_LVL_REF_FRAME) : 0) | (s->feature_enabled[i][GST_VP9_SEG_SEG_LVL_SKIP] ? V4L2_VP9_SEGMENT_FEATURE_ENABLED(V4L2_VP9_SEG_LVL_SKIP) : 0); /* *INDENT-ON* */ } memcpy (v4l2_segmentation->feature_data, s->feature_data, sizeof (v4l2_segmentation->feature_data)); } static void gst_v4l2_codec_vp9_dec_fill_prob_updates (GstV4l2CodecVp9Dec * self, const GstVp9FrameHeader * h) { struct v4l2_ctrl_vp9_compressed_hdr *probs = &self->v4l2_delta_probs; G_STATIC_ASSERT (sizeof (probs->tx8) == sizeof (h->delta_probabilities.tx_probs_8x8)); G_STATIC_ASSERT (sizeof (probs->tx16) == sizeof (h->delta_probabilities.tx_probs_16x16)); G_STATIC_ASSERT (sizeof (probs->tx32) == sizeof (h->delta_probabilities.tx_probs_32x32)); G_STATIC_ASSERT (sizeof (probs->coef) == sizeof (h->delta_probabilities.coef)); G_STATIC_ASSERT (sizeof (probs->skip) == sizeof (h->delta_probabilities.skip)); G_STATIC_ASSERT (sizeof (probs->inter_mode) == sizeof (h->delta_probabilities.inter_mode)); G_STATIC_ASSERT (sizeof (probs->interp_filter) == sizeof (h->delta_probabilities.interp_filter)); G_STATIC_ASSERT (sizeof (probs->is_inter) == sizeof (h->delta_probabilities.is_inter)); G_STATIC_ASSERT (sizeof (probs->comp_mode) == sizeof (h->delta_probabilities.comp_mode)); G_STATIC_ASSERT (sizeof (probs->single_ref) == sizeof (h->delta_probabilities.single_ref)); G_STATIC_ASSERT (sizeof (probs->comp_ref) == sizeof (h->delta_probabilities.comp_ref)); G_STATIC_ASSERT (sizeof (probs->y_mode) == sizeof (h->delta_probabilities.y_mode)); G_STATIC_ASSERT (sizeof (probs->partition) == sizeof (h->delta_probabilities.partition)); G_STATIC_ASSERT (sizeof (probs->mv.joint) == sizeof (h->delta_probabilities.mv.joint)); G_STATIC_ASSERT (sizeof (probs->mv.sign) == sizeof (h->delta_probabilities.mv.sign)); G_STATIC_ASSERT (sizeof (probs->mv.classes) == sizeof (h->delta_probabilities.mv.klass)); G_STATIC_ASSERT (sizeof (probs->mv.class0_bit) == sizeof (h->delta_probabilities.mv.class0_bit)); G_STATIC_ASSERT (sizeof (probs->mv.bits) == sizeof (h->delta_probabilities.mv.bits)); G_STATIC_ASSERT (sizeof (probs->mv.class0_fr) == sizeof (h->delta_probabilities.mv.class0_fr)); G_STATIC_ASSERT (sizeof (probs->mv.fr) == sizeof (h->delta_probabilities.mv.fr)); G_STATIC_ASSERT (sizeof (probs->mv.class0_hp) == sizeof (h->delta_probabilities.mv.class0_hp)); G_STATIC_ASSERT (sizeof (probs->mv.hp) == sizeof (h->delta_probabilities.mv.hp)); memset (probs, 0, sizeof (*probs)); probs->tx_mode = h->tx_mode; memcpy (probs->tx8, h->delta_probabilities.tx_probs_8x8, sizeof (probs->tx8)); memcpy (probs->tx16, h->delta_probabilities.tx_probs_16x16, sizeof (probs->tx16)); memcpy (probs->tx32, h->delta_probabilities.tx_probs_32x32, sizeof (probs->tx32)); memcpy (probs->coef, h->delta_probabilities.coef, sizeof (probs->coef)); memcpy (probs->skip, h->delta_probabilities.skip, sizeof (probs->skip)); memcpy (probs->inter_mode, h->delta_probabilities.inter_mode, sizeof (probs->inter_mode)); memcpy (probs->interp_filter, h->delta_probabilities.interp_filter, sizeof (probs->interp_filter)); memcpy (probs->is_inter, h->delta_probabilities.is_inter, sizeof (probs->is_inter)); memcpy (probs->comp_mode, h->delta_probabilities.comp_mode, sizeof (probs->comp_mode)); memcpy (probs->single_ref, h->delta_probabilities.single_ref, sizeof (probs->single_ref)); memcpy (probs->comp_ref, h->delta_probabilities.comp_ref, sizeof (probs->comp_ref)); memcpy (probs->y_mode, h->delta_probabilities.y_mode, sizeof (probs->y_mode)); memcpy (probs->partition, h->delta_probabilities.partition, sizeof (probs->partition)); memcpy (probs->mv.joint, h->delta_probabilities.mv.joint, sizeof (h->delta_probabilities.mv.joint)); memcpy (probs->mv.sign, h->delta_probabilities.mv.sign, sizeof (h->delta_probabilities.mv.sign)); memcpy (probs->mv.classes, h->delta_probabilities.mv.klass, sizeof (h->delta_probabilities.mv.klass)); memcpy (probs->mv.class0_bit, h->delta_probabilities.mv.class0_bit, sizeof (h->delta_probabilities.mv.class0_bit)); memcpy (probs->mv.bits, h->delta_probabilities.mv.bits, sizeof (h->delta_probabilities.mv.bits)); memcpy (probs->mv.class0_fr, h->delta_probabilities.mv.class0_fr, sizeof (h->delta_probabilities.mv.class0_fr)); memcpy (probs->mv.fr, h->delta_probabilities.mv.fr, sizeof (h->delta_probabilities.mv.fr)); memcpy (probs->mv.class0_hp, h->delta_probabilities.mv.class0_hp, sizeof (h->delta_probabilities.mv.class0_hp)); memcpy (probs->mv.hp, h->delta_probabilities.mv.hp, sizeof (h->delta_probabilities.mv.hp)); } static void gst_v4l2_codecs_vp9_dec_fill_refs (GstV4l2CodecVp9Dec * self, const GstVp9FrameHeader * h, const GstVp9Dpb * reference_frames) { GstVp9Picture *ref_pic; if (reference_frames && reference_frames->pic_list[h->ref_frame_idx[0]]) { ref_pic = reference_frames->pic_list[h->ref_frame_idx[0]]; self->v4l2_vp9_frame.last_frame_ts = ref_pic->system_frame_number * G_GUINT64_CONSTANT (1000); } if (reference_frames && reference_frames->pic_list[h->ref_frame_idx[1]]) { ref_pic = reference_frames->pic_list[h->ref_frame_idx[1]]; self->v4l2_vp9_frame.golden_frame_ts = ref_pic->system_frame_number * G_GUINT64_CONSTANT (1000); } if (reference_frames && reference_frames->pic_list[h->ref_frame_idx[2]]) { ref_pic = reference_frames->pic_list[h->ref_frame_idx[2]]; self->v4l2_vp9_frame.alt_frame_ts = ref_pic->system_frame_number * G_GUINT64_CONSTANT (1000); } } static void gst_v4l2_codec_vp9_dec_fill_dec_params (GstV4l2CodecVp9Dec * self, const GstVp9FrameHeader * h, const GstVp9Dpb * reference_frames) { /* *INDENT-OFF* */ self->v4l2_vp9_frame = (struct v4l2_ctrl_vp9_frame) { .flags = (h->frame_type == GST_VP9_KEY_FRAME ? V4L2_VP9_FRAME_FLAG_KEY_FRAME : 0) | (h->show_frame ? V4L2_VP9_FRAME_FLAG_SHOW_FRAME : 0) | (h->error_resilient_mode ? V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT : 0) | (h->intra_only ? V4L2_VP9_FRAME_FLAG_INTRA_ONLY : 0) | (h->allow_high_precision_mv ? V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV : 0) | (h->refresh_frame_context ? V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX : 0) | (h->frame_parallel_decoding_mode ? V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE : 0) | (self->subsampling_x ? V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING : 0) | (self->subsampling_y ? V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING : 0) | (self->color_range ? V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING : 0), .compressed_header_size = h->header_size_in_bytes, .uncompressed_header_size = h->frame_header_length_in_bytes, .profile = h->profile, .frame_context_idx = h->frame_context_idx, .bit_depth = self->bit_depth, .interpolation_filter = h->interpolation_filter, .tile_cols_log2 = h->tile_cols_log2, .tile_rows_log2 = h->tile_rows_log2, .reference_mode = h->reference_mode, .frame_width_minus_1 = h->width - 1, .frame_height_minus_1 = h->height - 1, .render_width_minus_1 = h->render_width ? h->render_width - 1 : h->width - 1, .render_height_minus_1 = h->render_height ? h->render_height - 1: h->height - 1, .ref_frame_sign_bias = (h->ref_frame_sign_bias[GST_VP9_REF_FRAME_LAST] ? V4L2_VP9_SIGN_BIAS_LAST : 0) | (h->ref_frame_sign_bias[GST_VP9_REF_FRAME_GOLDEN] ? V4L2_VP9_SIGN_BIAS_GOLDEN : 0) | (h->ref_frame_sign_bias[GST_VP9_REF_FRAME_ALTREF] ? V4L2_VP9_SIGN_BIAS_ALT : 0), .lf = (struct v4l2_vp9_loop_filter) { .flags = (h->loop_filter_params.loop_filter_delta_enabled ? V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED : 0) | (h->loop_filter_params.loop_filter_delta_update ? V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE : 0), .level = h->loop_filter_params.loop_filter_level, .sharpness = h->loop_filter_params.loop_filter_sharpness }, .quant = (struct v4l2_vp9_quantization) { .base_q_idx = h->quantization_params.base_q_idx, /* used for Y (luma) AC coefficients */ .delta_q_y_dc = h->quantization_params.delta_q_y_dc, .delta_q_uv_dc = h->quantization_params.delta_q_uv_dc, .delta_q_uv_ac = h->quantization_params.delta_q_uv_ac, }, .seg = (struct v4l2_vp9_segmentation) { .flags = (h->segmentation_params.segmentation_enabled ? V4L2_VP9_SEGMENTATION_FLAG_ENABLED : 0) | (h->segmentation_params.segmentation_update_map ? V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP : 0) | (h->segmentation_params.segmentation_temporal_update ? V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE : 0) | (h->segmentation_params.segmentation_update_data ? V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA : 0) | (h->segmentation_params.segmentation_abs_or_delta_update ? V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE : 0), } }; /* *INDENT-ON* */ switch (h->reset_frame_context) { case 0: case 1: self->v4l2_vp9_frame.reset_frame_context = V4L2_VP9_RESET_FRAME_CTX_NONE; break; case 2: self->v4l2_vp9_frame.reset_frame_context = V4L2_VP9_RESET_FRAME_CTX_SPEC; break; case 3: self->v4l2_vp9_frame.reset_frame_context = V4L2_VP9_RESET_FRAME_CTX_ALL; break; default: break; } gst_v4l2_codecs_vp9_dec_fill_refs (self, h, reference_frames); gst_v4l2_codec_vp9_dec_fill_lf_params (self, &h->loop_filter_params); gst_v4l2_codec_vp9_dec_fill_seg_params (self, &h->segmentation_params); } static gboolean gst_v4l2_codec_vp9_dec_open (GstVideoDecoder * decoder) { GstVp9Decoder *vp9dec = GST_VP9_DECODER (decoder); GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); if (!gst_v4l2_decoder_open (self->decoder)) { GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE, ("Failed to open VP9 decoder"), ("gst_v4l2_decoder_open() failed: %s", g_strerror (errno))); return FALSE; } vp9dec->parse_compressed_headers = gst_v4l2_decoder_query_control_size (self->decoder, V4L2_CID_STATELESS_VP9_COMPRESSED_HDR, NULL); /* V4L2 does not support non-keyframe resolution change, this will ask the * base class to drop frame until the next keyframe as a workaround. */ gst_vp9_decoder_set_non_keyframe_format_change_support (vp9dec, FALSE); return TRUE; } static gboolean gst_v4l2_codec_vp9_dec_close (GstVideoDecoder * decoder) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); gst_v4l2_decoder_close (self->decoder); return TRUE; } static void gst_v4l2_codec_vp9_dec_streamoff (GstV4l2CodecVp9Dec * self) { if (self->streaming) { gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SINK); gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC); self->streaming = FALSE; } } static void gst_v4l2_codec_vp9_dec_reset_allocation (GstV4l2CodecVp9Dec * self) { if (self->sink_allocator) { gst_v4l2_codec_allocator_detach (self->sink_allocator); g_clear_object (&self->sink_allocator); } if (self->src_allocator) { gst_v4l2_codec_allocator_detach (self->src_allocator); g_clear_object (&self->src_allocator); g_clear_object (&self->src_pool); } } static gboolean gst_v4l2_codec_vp9_dec_stop (GstVideoDecoder * decoder) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SINK); gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC); gst_v4l2_codec_vp9_dec_reset_allocation (self); if (self->output_state) gst_video_codec_state_unref (self->output_state); self->output_state = NULL; return GST_VIDEO_DECODER_CLASS (parent_class)->stop (decoder); } static gboolean gst_v4l2_codec_vp9_dec_negotiate (GstVideoDecoder * decoder) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); GstVp9Decoder *vp9dec = GST_VP9_DECODER (decoder); /* *INDENT-OFF* */ struct v4l2_ext_control control[] = { { .id = V4L2_CID_STATELESS_VP9_FRAME, .ptr = &self->v4l2_vp9_frame, .size = sizeof (self->v4l2_vp9_frame), }, }; /* *INDENT-ON* */ GstCaps *filter, *caps; /* Ignore downstream renegotiation request. */ if (self->streaming) goto done; GST_DEBUG_OBJECT (self, "Negotiate"); gst_v4l2_codec_vp9_dec_reset_allocation (self); if (!gst_v4l2_decoder_set_sink_fmt (self->decoder, V4L2_PIX_FMT_VP9_FRAME, self->width, self->height, self->bit_depth)) { GST_ELEMENT_ERROR (self, CORE, NEGOTIATION, ("Failed to configure VP9 decoder"), ("gst_v4l2_decoder_set_sink_fmt() failed: %s", g_strerror (errno))); gst_v4l2_decoder_close (self->decoder); return FALSE; } if (!gst_v4l2_decoder_set_controls (self->decoder, NULL, control, G_N_ELEMENTS (control))) { GST_ELEMENT_ERROR (decoder, RESOURCE, WRITE, ("Driver does not support the selected stream."), (NULL)); return FALSE; } filter = gst_v4l2_decoder_enum_src_formats (self->decoder); if (!filter) { GST_ELEMENT_ERROR (self, CORE, NEGOTIATION, ("No supported decoder output formats"), (NULL)); return FALSE; } GST_DEBUG_OBJECT (self, "Supported output formats: %" GST_PTR_FORMAT, filter); caps = gst_pad_peer_query_caps (decoder->srcpad, filter); gst_caps_unref (filter); GST_DEBUG_OBJECT (self, "Peer supported formats: %" GST_PTR_FORMAT, caps); if (!gst_v4l2_decoder_select_src_format (self->decoder, caps, &self->vinfo)) { GST_ELEMENT_ERROR (self, CORE, NEGOTIATION, ("Unsupported pixel format"), ("No support for %ux%u format %s", self->width, self->height, gst_video_format_to_string (GST_VIDEO_INFO_FORMAT (&self->vinfo)))); gst_caps_unref (caps); return FALSE; } gst_caps_unref (caps); done: if (self->output_state) gst_video_codec_state_unref (self->output_state); self->output_state = gst_video_decoder_set_output_state (GST_VIDEO_DECODER (self), self->vinfo.finfo->format, self->width, self->height, vp9dec->input_state); self->output_state->caps = gst_video_info_to_caps (&self->output_state->info); if (GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder)) { if (self->streaming) return TRUE; if (!gst_v4l2_decoder_streamon (self->decoder, GST_PAD_SINK)) { GST_ELEMENT_ERROR (self, RESOURCE, FAILED, ("Could not enable the decoder driver."), ("VIDIOC_STREAMON(SINK) failed: %s", g_strerror (errno))); return FALSE; } if (!gst_v4l2_decoder_streamon (self->decoder, GST_PAD_SRC)) { GST_ELEMENT_ERROR (self, RESOURCE, FAILED, ("Could not enable the decoder driver."), ("VIDIOC_STREAMON(SRC) failed: %s", g_strerror (errno))); return FALSE; } self->streaming = TRUE; return TRUE; } return FALSE; } static gboolean gst_v4l2_codec_vp9_dec_decide_allocation (GstVideoDecoder * decoder, GstQuery * query) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); guint min = 0; guint num_bitstream; self->has_videometa = gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL); g_clear_object (&self->src_pool); g_clear_object (&self->src_allocator); if (gst_query_get_n_allocation_pools (query) > 0) gst_query_parse_nth_allocation_pool (query, 0, NULL, NULL, &min, NULL); min = MAX (2, min); num_bitstream = 1 + MAX (1, gst_v4l2_decoder_get_render_delay (self->decoder)); self->sink_allocator = gst_v4l2_codec_allocator_new (self->decoder, GST_PAD_SINK, num_bitstream); if (!self->sink_allocator) { GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT, ("Not enough memory to allocate sink buffers."), (NULL)); return FALSE; } self->src_allocator = gst_v4l2_codec_allocator_new (self->decoder, GST_PAD_SRC, GST_VP9_REF_FRAMES + min + 4); if (!self->src_allocator) { GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT, ("Not enough memory to allocate source buffers."), (NULL)); g_clear_object (&self->sink_allocator); return FALSE; } self->src_pool = gst_v4l2_codec_pool_new (self->src_allocator, &self->vinfo); /* Our buffer pool is internal, we will let the base class create a video * pool, and use it if we are running out of buffers or if downstream does * not support GstVideoMeta */ return GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder, query); } static GstFlowReturn gst_v4l2_codec_vp9_dec_new_sequence (GstVp9Decoder * decoder, const GstVp9FrameHeader * frame_hdr, gint max_dpb_size) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); gboolean negotiation_needed = FALSE; if (self->vinfo.finfo->format == GST_VIDEO_FORMAT_UNKNOWN) negotiation_needed = TRUE; /* TODO Check if current buffers are large enough, and reuse them */ if (self->width != frame_hdr->width || self->height != frame_hdr->height) { self->width = frame_hdr->width; self->height = frame_hdr->height; negotiation_needed = TRUE; GST_INFO_OBJECT (self, "Resolution changed to %dx%d", self->width, self->height); } if (self->subsampling_x != frame_hdr->subsampling_x || self->subsampling_y != frame_hdr->subsampling_y) { GST_DEBUG_OBJECT (self, "subsampling changed from x: %d, y: %d to x: %d, y: %d", self->subsampling_x, self->subsampling_y, frame_hdr->subsampling_x, frame_hdr->subsampling_y); self->subsampling_x = frame_hdr->subsampling_x; self->subsampling_y = frame_hdr->subsampling_y; negotiation_needed = TRUE; } if (frame_hdr->color_space != GST_VP9_CS_UNKNOWN && frame_hdr->color_space != GST_VP9_CS_RESERVED_2 && frame_hdr->color_space != self->color_space) { GST_DEBUG_OBJECT (self, "colorspace changed from %d to %d", self->color_space, frame_hdr->color_space); self->color_space = frame_hdr->color_space; negotiation_needed = TRUE; } if (frame_hdr->color_range != self->color_range) { GST_DEBUG_OBJECT (self, "color range changed from %d to %d", self->color_range, frame_hdr->color_range); self->color_range = frame_hdr->color_range; negotiation_needed = TRUE; } if (frame_hdr->profile != GST_VP9_PROFILE_UNDEFINED && frame_hdr->profile != self->profile) { GST_DEBUG_OBJECT (self, "profile changed from %d to %d", self->profile, frame_hdr->profile); self->profile = frame_hdr->profile; negotiation_needed = TRUE; } if (frame_hdr->bit_depth != self->bit_depth) { GST_DEBUG_OBJECT (self, "bit-depth changed from %d to %d", self->bit_depth, frame_hdr->bit_depth); self->bit_depth = frame_hdr->bit_depth; negotiation_needed = TRUE; } gst_v4l2_codec_vp9_dec_fill_dec_params (self, frame_hdr, NULL); if (decoder->parse_compressed_headers) gst_v4l2_codec_vp9_dec_fill_prob_updates (self, frame_hdr); if (negotiation_needed) { gst_v4l2_codec_vp9_dec_streamoff (self); if (!gst_video_decoder_negotiate (GST_VIDEO_DECODER (self))) { GST_ERROR_OBJECT (self, "Failed to negotiate with downstream"); return GST_FLOW_ERROR; } } /* Check if we can zero-copy buffers */ if (!self->has_videometa) { GstVideoInfo ref_vinfo; gint i; gst_video_info_set_format (&ref_vinfo, GST_VIDEO_INFO_FORMAT (&self->vinfo), self->width, self->height); for (i = 0; i < GST_VIDEO_INFO_N_PLANES (&self->vinfo); i++) { if (self->vinfo.stride[i] != ref_vinfo.stride[i] || self->vinfo.offset[i] != ref_vinfo.offset[i]) { GST_WARNING_OBJECT (self, "GstVideoMeta support required, copying frames."); self->copy_frames = TRUE; break; } } } else { self->copy_frames = FALSE; } return GST_FLOW_OK; } static GstFlowReturn gst_v4l2_codec_vp9_dec_start_picture (GstVp9Decoder * decoder, GstVp9Picture * picture) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); /* FIXME base class should not call us if negotiation failed */ if (!self->sink_allocator) return GST_FLOW_ERROR; /* Ensure we have a bitstream to write into */ if (!self->bitstream) { self->bitstream = gst_v4l2_codec_allocator_alloc (self->sink_allocator); if (!self->bitstream) { GST_ELEMENT_ERROR (decoder, RESOURCE, NO_SPACE_LEFT, ("Not enough memory to decode VP9 stream."), (NULL)); return GST_FLOW_ERROR; } if (!gst_memory_map (self->bitstream, &self->bitstream_map, GST_MAP_WRITE)) { GST_ELEMENT_ERROR (decoder, RESOURCE, WRITE, ("Could not access bitstream memory for writing"), (NULL)); g_clear_pointer (&self->bitstream, gst_memory_unref); return GST_FLOW_ERROR; } } /* We use this field to track how much we have written */ self->bitstream_map.size = 0; return GST_FLOW_OK; } static void gst_v4l2_codec_vp9_dec_reset_picture (GstV4l2CodecVp9Dec * self) { if (self->bitstream) { if (self->bitstream_map.memory) gst_memory_unmap (self->bitstream, &self->bitstream_map); g_clear_pointer (&self->bitstream, gst_memory_unref); self->bitstream_map = (GstMapInfo) GST_MAP_INFO_INIT; } } static GstFlowReturn gst_v4l2_codec_vp9_dec_decode_picture (GstVp9Decoder * decoder, GstVp9Picture * picture, GstVp9Dpb * dpb) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); guint8 *bitstream_data = self->bitstream_map.data; if (self->bitstream_map.maxsize < picture->size) { GST_ELEMENT_ERROR (decoder, RESOURCE, NO_SPACE_LEFT, ("Not enough space to send picture bitstream."), (NULL)); gst_v4l2_codec_vp9_dec_reset_picture (self); return GST_FLOW_ERROR; } gst_v4l2_codec_vp9_dec_fill_dec_params (self, &picture->frame_hdr, dpb); if (decoder->parse_compressed_headers) gst_v4l2_codec_vp9_dec_fill_prob_updates (self, &picture->frame_hdr); memcpy (bitstream_data, picture->data, picture->size); self->bitstream_map.size = picture->size; return GST_FLOW_OK; } static GstFlowReturn gst_v4l2_codec_vp9_dec_end_picture (GstVp9Decoder * decoder, GstVp9Picture * picture) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); GstVideoCodecFrame *frame; GstV4l2Request *request = NULL; GstFlowReturn flow_ret; gsize bytesused; guint num_controls = 1; /* *INDENT-OFF* */ struct v4l2_ext_control decode_params_control[] = { { .id = V4L2_CID_STATELESS_VP9_FRAME, .ptr = &self->v4l2_vp9_frame, .size = sizeof(self->v4l2_vp9_frame), }, { /* V4L2_CID_STATELESS_VP9_COMPRESSED_HDR */ }, }; if (decoder->parse_compressed_headers) { decode_params_control[num_controls++] = (struct v4l2_ext_control) { .id = V4L2_CID_STATELESS_VP9_COMPRESSED_HDR, .ptr = &self->v4l2_delta_probs, .size = sizeof (self->v4l2_delta_probs), }; } /* *INDENT-ON* */ bytesused = self->bitstream_map.size; gst_memory_unmap (self->bitstream, &self->bitstream_map); self->bitstream_map = (GstMapInfo) GST_MAP_INFO_INIT; gst_memory_resize (self->bitstream, 0, bytesused); frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (self), picture->system_frame_number); g_return_val_if_fail (frame, FALSE); flow_ret = gst_buffer_pool_acquire_buffer (GST_BUFFER_POOL (self->src_pool), &frame->output_buffer, NULL); if (flow_ret != GST_FLOW_OK) { if (flow_ret == GST_FLOW_FLUSHING) GST_DEBUG_OBJECT (self, "Frame decoding aborted, we are flushing."); else GST_ELEMENT_ERROR (decoder, RESOURCE, WRITE, ("No more picture buffer available."), (NULL)); goto fail; } request = gst_v4l2_decoder_alloc_request (self->decoder, picture->system_frame_number, self->bitstream, frame->output_buffer); gst_video_codec_frame_unref (frame); if (!request) { GST_ELEMENT_ERROR (decoder, RESOURCE, NO_SPACE_LEFT, ("Failed to allocate a media request object."), (NULL)); goto fail; } if (!gst_v4l2_decoder_set_controls (self->decoder, request, decode_params_control, num_controls)) { GST_ELEMENT_ERROR (decoder, RESOURCE, WRITE, ("Driver did not accept the bitstream parameters."), (NULL)); goto fail; } if (!gst_v4l2_request_queue (request, 0)) { GST_ELEMENT_ERROR (decoder, RESOURCE, WRITE, ("Driver did not accept the decode request."), (NULL)); goto fail; } gst_vp9_picture_set_user_data (picture, request, (GDestroyNotify) gst_v4l2_request_unref); gst_v4l2_codec_vp9_dec_reset_picture (self); return GST_FLOW_OK; fail: if (request) gst_v4l2_request_unref (request); gst_v4l2_codec_vp9_dec_reset_picture (self); return GST_FLOW_ERROR; } static gboolean gst_v4l2_codec_vp9_dec_copy_output_buffer (GstV4l2CodecVp9Dec * self, GstVideoCodecFrame * codec_frame) { GstVideoFrame src_frame; GstVideoFrame dest_frame; GstVideoInfo dest_vinfo; GstBuffer *buffer; gst_video_info_set_format (&dest_vinfo, GST_VIDEO_INFO_FORMAT (&self->vinfo), self->width, self->height); buffer = gst_video_decoder_allocate_output_buffer (GST_VIDEO_DECODER (self)); if (!buffer) goto fail; if (!gst_video_frame_map (&src_frame, &self->vinfo, codec_frame->output_buffer, GST_MAP_READ)) goto fail; if (!gst_video_frame_map (&dest_frame, &dest_vinfo, buffer, GST_MAP_WRITE)) { gst_video_frame_unmap (&dest_frame); goto fail; } /* gst_video_frame_copy can crop this, but does not know, so let make it * think it's all right */ GST_VIDEO_INFO_WIDTH (&src_frame.info) = self->width; GST_VIDEO_INFO_HEIGHT (&src_frame.info) = self->height; if (!gst_video_frame_copy (&dest_frame, &src_frame)) { gst_video_frame_unmap (&src_frame); gst_video_frame_unmap (&dest_frame); goto fail; } gst_video_frame_unmap (&src_frame); gst_video_frame_unmap (&dest_frame); gst_buffer_replace (&codec_frame->output_buffer, buffer); gst_buffer_unref (buffer); return TRUE; fail: GST_ERROR_OBJECT (self, "Failed copy output buffer."); return FALSE; } static GstVp9Picture * gst_v4l2_codec_vp9_dec_duplicate_picture (GstVp9Decoder * decoder, GstVideoCodecFrame * frame, GstVp9Picture * picture) { GstVp9Picture *new_picture; GST_DEBUG_OBJECT (decoder, "Duplicate picture %u", picture->system_frame_number); new_picture = gst_vp9_picture_new (); new_picture->frame_hdr = picture->frame_hdr; new_picture->system_frame_number = frame->system_frame_number; if (GST_MINI_OBJECT_FLAG_IS_SET (picture, FLAG_PICTURE_HOLDS_BUFFER)) { GstBuffer *output_buffer = gst_vp9_picture_get_user_data (picture); if (output_buffer) { frame->output_buffer = gst_buffer_ref (output_buffer); /* We need to also hold on the picture so it stays alive, but also to * ensure we can duplicate it too. */ gst_vp9_picture_set_user_data (new_picture, gst_buffer_ref (frame->output_buffer), (GDestroyNotify) gst_buffer_unref); } /* Flag regardless if the buffer is null, so we don't start thinking it * should hold a request unconditionally. */ GST_MINI_OBJECT_FLAG_SET (new_picture, FLAG_PICTURE_HOLDS_BUFFER); } else { GstV4l2Request *request = gst_vp9_picture_get_user_data (picture); gst_vp9_picture_set_user_data (new_picture, gst_v4l2_request_ref (request), (GDestroyNotify) gst_v4l2_request_unref); frame->output_buffer = gst_v4l2_request_dup_pic_buf (request); } return new_picture; } static GstFlowReturn gst_v4l2_codec_vp9_dec_output_picture (GstVp9Decoder * decoder, GstVideoCodecFrame * frame, GstVp9Picture * picture) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); GstVideoDecoder *vdec = GST_VIDEO_DECODER (decoder); GstV4l2Request *request = NULL; gint ret; if (picture->discont_state) { if (!gst_video_decoder_negotiate (vdec)) { GST_ERROR_OBJECT (vdec, "Could not re-negotiate with updated state"); return FALSE; } } GST_DEBUG_OBJECT (self, "Output picture %u", picture->system_frame_number); if (!GST_MINI_OBJECT_FLAG_IS_SET (picture, FLAG_PICTURE_HOLDS_BUFFER)) request = gst_vp9_picture_get_user_data (picture); if (request) { ret = gst_v4l2_request_set_done (request); if (ret == 0) { GST_ELEMENT_ERROR (self, STREAM, DECODE, ("Decoding frame took too long"), (NULL)); goto error; } else if (ret < 0) { GST_ELEMENT_ERROR (self, STREAM, DECODE, ("Decoding request failed: %s", g_strerror (errno)), (NULL)); goto error; } g_return_val_if_fail (frame->output_buffer, GST_FLOW_ERROR); if (gst_v4l2_request_failed (request)) { GST_ELEMENT_ERROR (self, STREAM, DECODE, ("Failed to decode frame %u", picture->system_frame_number), (NULL)); goto error; } /* Hold on reference buffers for the rest of the picture lifetime */ gst_vp9_picture_set_user_data (picture, gst_buffer_ref (frame->output_buffer), (GDestroyNotify) gst_buffer_unref); GST_MINI_OBJECT_FLAG_SET (picture, FLAG_PICTURE_HOLDS_BUFFER); } /* This may happen if we duplicate a picture witch failed to decode */ if (!frame->output_buffer) { GST_ELEMENT_ERROR (self, STREAM, DECODE, ("Failed to decode frame %u", picture->system_frame_number), (NULL)); goto error; } if (self->copy_frames) gst_v4l2_codec_vp9_dec_copy_output_buffer (self, frame); gst_vp9_picture_unref (picture); return gst_video_decoder_finish_frame (vdec, frame); error: gst_video_decoder_drop_frame (vdec, frame); gst_vp9_picture_unref (picture); return GST_FLOW_ERROR; } static void gst_v4l2_codec_vp9_dec_set_flushing (GstV4l2CodecVp9Dec * self, gboolean flushing) { if (self->sink_allocator) gst_v4l2_codec_allocator_set_flushing (self->sink_allocator, flushing); if (self->src_allocator) gst_v4l2_codec_allocator_set_flushing (self->src_allocator, flushing); } static gboolean gst_v4l2_codec_vp9_dec_flush (GstVideoDecoder * decoder) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); GST_DEBUG_OBJECT (self, "Flushing decoder state."); gst_v4l2_decoder_flush (self->decoder); gst_v4l2_codec_vp9_dec_set_flushing (self, FALSE); return GST_VIDEO_DECODER_CLASS (parent_class)->flush (decoder); } static gboolean gst_v4l2_codec_vp9_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (decoder); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: GST_DEBUG_OBJECT (self, "flush start"); gst_v4l2_codec_vp9_dec_set_flushing (self, TRUE); break; default: break; } return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event); } static GstStateChangeReturn gst_v4l2_codec_vp9_dec_change_state (GstElement * element, GstStateChange transition) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (element); if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) gst_v4l2_codec_vp9_dec_set_flushing (self, TRUE); return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); } static void gst_v4l2_codec_vp9_dec_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (object); GObject *dec = G_OBJECT (self->decoder); switch (prop_id) { default: gst_v4l2_decoder_set_property (dec, prop_id - PROP_LAST, value, pspec); break; } } static void gst_v4l2_codec_vp9_dec_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (object); GObject *dec = G_OBJECT (self->decoder); switch (prop_id) { default: gst_v4l2_decoder_get_property (dec, prop_id - PROP_LAST, value, pspec); break; } } static void gst_v4l2_codec_vp9_dec_init (GstV4l2CodecVp9Dec * self) { } static void gst_v4l2_codec_vp9_dec_subinit (GstV4l2CodecVp9Dec * self, GstV4l2CodecVp9DecClass * klass) { self->decoder = gst_v4l2_decoder_new (klass->device); gst_video_info_init (&self->vinfo); } static void gst_v4l2_codec_vp9_dec_dispose (GObject * object) { GstV4l2CodecVp9Dec *self = GST_V4L2_CODEC_VP9_DEC (object); g_clear_object (&self->decoder); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_v4l2_codec_vp9_dec_class_init (GstV4l2CodecVp9DecClass * klass) { } static void gst_v4l2_codec_vp9_dec_subclass_init (GstV4l2CodecVp9DecClass * klass, GstV4l2CodecDevice * device) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *element_class = GST_ELEMENT_CLASS (klass); GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass); GstVp9DecoderClass *vp9decoder_class = GST_VP9_DECODER_CLASS (klass); gobject_class->set_property = gst_v4l2_codec_vp9_dec_set_property; gobject_class->get_property = gst_v4l2_codec_vp9_dec_get_property; gobject_class->dispose = gst_v4l2_codec_vp9_dec_dispose; gst_element_class_set_static_metadata (element_class, "V4L2 Stateless VP9 Video Decoder", "Codec/Decoder/Video/Hardware", "A V4L2 based VP9 video decoder", "Daniel Almeida "); gst_element_class_add_static_pad_template (element_class, &sink_template); gst_element_class_add_static_pad_template (element_class, &src_template); element_class->change_state = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_change_state); decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_open); decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_close); decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_stop); decoder_class->negotiate = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_negotiate); decoder_class->decide_allocation = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_decide_allocation); decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_flush); decoder_class->sink_event = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_sink_event); vp9decoder_class->new_sequence = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_new_sequence); vp9decoder_class->start_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_start_picture); vp9decoder_class->decode_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_decode_picture); vp9decoder_class->end_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_end_picture); vp9decoder_class->output_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_output_picture); vp9decoder_class->duplicate_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_duplicate_picture); vp9decoder_class->get_preferred_output_delay = GST_DEBUG_FUNCPTR (gst_v4l2_codec_vp9_dec_get_preferred_output_delay); klass->device = device; gst_v4l2_decoder_install_properties (gobject_class, PROP_LAST, device); } static void gst_v4l2_codec_vp9_alpha_decode_bin_subclass_init (GstV4l2CodecAlphaDecodeBinClass * klass, gchar * decoder_name) { GstV4l2CodecAlphaDecodeBinClass *adbin_class = (GstV4l2CodecAlphaDecodeBinClass *) klass; GstElementClass *element_class = (GstElementClass *) klass; adbin_class->decoder_name = decoder_name; gst_element_class_add_static_pad_template (element_class, &alpha_template); gst_element_class_set_static_metadata (element_class, "VP9 Alpha Decoder", "Codec/Decoder/Video", "Wrapper bin to decode VP9 with alpha stream.", "Nicolas Dufresne "); } void gst_v4l2_codec_vp9_dec_register (GstPlugin * plugin, GstV4l2Decoder * decoder, GstV4l2CodecDevice * device, guint rank) { gchar *element_name; GstCaps *src_caps, *alpha_caps; GST_DEBUG_CATEGORY_INIT (v4l2_vp9dec_debug, "v4l2codecs-vp9dec", 0, "V4L2 stateless VP9 decoder"); if (!gst_v4l2_decoder_set_sink_fmt (decoder, V4L2_PIX_FMT_VP9_FRAME, 320, 240, 8)) return; src_caps = gst_v4l2_decoder_enum_src_formats (decoder); if (gst_caps_is_empty (src_caps)) { GST_WARNING ("Not registering VP9 decoder since it produces no " "supported format"); goto done; } gst_v4l2_decoder_register (plugin, GST_TYPE_V4L2_CODEC_VP9_DEC, (GClassInitFunc) gst_v4l2_codec_vp9_dec_subclass_init, gst_mini_object_ref (GST_MINI_OBJECT (device)), (GInstanceInitFunc) gst_v4l2_codec_vp9_dec_subinit, "v4l2sl%svp9dec", device, rank, &element_name); if (!element_name) goto done; alpha_caps = gst_caps_from_string ("video/x-raw,format={I420, NV12}"); if (gst_caps_can_intersect (src_caps, alpha_caps)) gst_v4l2_codec_alpha_decode_bin_register (plugin, (GClassInitFunc) gst_v4l2_codec_vp9_alpha_decode_bin_subclass_init, element_name, "v4l2slvp9%salphadecodebin", device, rank); gst_caps_unref (alpha_caps); done: gst_caps_unref (src_caps); }