/* GStreamer * Copyright (C) 2020 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 #endif #include "gstv4l2codecallocator.h" #include "gstv4l2codech264dec.h" #include "gstv4l2codecpool.h" #include "gstv4l2format.h" #include "linux/v4l2-controls.h" #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) #define V4L2_MIN_KERNEL_VER_MAJOR 5 #define V4L2_MIN_KERNEL_VER_MINOR 11 #define V4L2_MIN_KERNEL_VERSION KERNEL_VERSION(V4L2_MIN_KERNEL_VER_MAJOR, V4L2_MIN_KERNEL_VER_MINOR, 0) GST_DEBUG_CATEGORY_STATIC (v4l2_h264dec_debug); #define GST_CAT_DEFAULT v4l2_h264dec_debug 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-h264, " "stream-format=(string) { avc, avc3, byte-stream }, " "alignment=(string) au") ); 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 _GstV4l2CodecH264Dec { GstH264Decoder parent; GstV4l2Decoder *decoder; GstVideoCodecState *output_state; GstVideoInfo vinfo; gint display_width; gint display_height; gint coded_width; gint coded_height; guint bitdepth; guint chroma_format_idc; guint num_slices; gboolean first_slice; GstV4l2CodecAllocator *sink_allocator; GstV4l2CodecAllocator *src_allocator; GstV4l2CodecPool *src_pool; gint min_pool_size; gboolean has_videometa; gboolean need_negotiation; gboolean interlaced; gboolean need_sequence; gboolean copy_frames; gboolean scaling_matrix_present; struct v4l2_ctrl_h264_sps sps; struct v4l2_ctrl_h264_pps pps; struct v4l2_ctrl_h264_scaling_matrix scaling_matrix; struct v4l2_ctrl_h264_decode_params decode_params; struct v4l2_ctrl_h264_pred_weights pred_weight; GArray *slice_params; enum v4l2_stateless_h264_decode_mode decode_mode; enum v4l2_stateless_h264_start_code start_code; GstMemory *bitstream; GstMapInfo bitstream_map; }; G_DEFINE_ABSTRACT_TYPE (GstV4l2CodecH264Dec, gst_v4l2_codec_h264_dec, GST_TYPE_H264_DECODER); #define parent_class gst_v4l2_codec_h264_dec_parent_class static gboolean is_frame_based (GstV4l2CodecH264Dec * self) { return self->decode_mode == V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED; } static gboolean is_slice_based (GstV4l2CodecH264Dec * self) { return self->decode_mode == V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED; } static gboolean needs_start_codes (GstV4l2CodecH264Dec * self) { return self->start_code == V4L2_STATELESS_H264_START_CODE_ANNEX_B; } static gboolean gst_v4l2_decoder_h264_api_check (GstV4l2Decoder * decoder) { guint i, ret_size; /* *INDENT-OFF* */ #define SET_ID(cid) .id = (cid), .name = #cid struct { const gchar *name; unsigned int id; unsigned int size; gboolean optional; } controls[] = { { SET_ID (V4L2_CID_STATELESS_H264_SPS), .size = sizeof(struct v4l2_ctrl_h264_sps), }, { SET_ID (V4L2_CID_STATELESS_H264_PPS), .size = sizeof(struct v4l2_ctrl_h264_pps), }, { SET_ID (V4L2_CID_STATELESS_H264_SCALING_MATRIX), .size = sizeof(struct v4l2_ctrl_h264_scaling_matrix), .optional = TRUE, }, { SET_ID (V4L2_CID_STATELESS_H264_DECODE_PARAMS), .size = sizeof(struct v4l2_ctrl_h264_decode_params), }, { SET_ID (V4L2_CID_STATELESS_H264_SLICE_PARAMS), .size = sizeof(struct v4l2_ctrl_h264_slice_params), .optional = TRUE, }, { SET_ID (V4L2_CID_STATELESS_H264_PRED_WEIGHTS), .size = sizeof(struct v4l2_ctrl_h264_pred_weights), .optional = TRUE, } }; #undef SET_ID /* *INDENT-ON* */ /* * Compatibility check: make sure the pointer controls are * the right size. */ for (i = 0; i < G_N_ELEMENTS (controls); i++) { gboolean control_found; control_found = gst_v4l2_decoder_query_control_size (decoder, controls[i].id, &ret_size); if (!controls[i].optional && !control_found) { GST_WARNING ("Driver is missing %s support.", controls[i].name); return FALSE; } if (control_found && ret_size != controls[i].size) { GST_WARNING ("%s control size mismatch: got %d bytes but %d expected.", controls[i].name, ret_size, controls[i].size); return FALSE; } } return TRUE; } static gboolean gst_v4l2_codec_h264_dec_open (GstVideoDecoder * decoder) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); /* *INDENT-OFF* */ struct v4l2_ext_control control[] = { { .id = V4L2_CID_STATELESS_H264_DECODE_MODE, }, { .id = V4L2_CID_STATELESS_H264_START_CODE, }, }; /* *INDENT-ON* */ if (!gst_v4l2_decoder_open (self->decoder)) { GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE, ("Failed to open H264 decoder"), ("gst_v4l2_decoder_open() failed: %s", g_strerror (errno))); return FALSE; } if (!gst_v4l2_decoder_get_controls (self->decoder, control, G_N_ELEMENTS (control))) { GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE, ("Driver did not report framing and start code method."), ("gst_v4l2_decoder_get_controls() failed: %s", g_strerror (errno))); return FALSE; } self->decode_mode = control[0].value; self->start_code = control[1].value; GST_INFO_OBJECT (self, "Opened H264 %s decoder %s", is_frame_based (self) ? "frame based" : "slice based", needs_start_codes (self) ? "using start-codes" : "without start-codes"); gst_h264_decoder_set_process_ref_pic_lists (GST_H264_DECODER (self), is_slice_based (self)); return TRUE; } static gboolean gst_v4l2_codec_h264_dec_close (GstVideoDecoder * decoder) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); gst_v4l2_decoder_close (self->decoder); return TRUE; } static void gst_v4l2_codec_h264_dec_reset_allocation (GstV4l2CodecH264Dec * 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_h264_dec_stop (GstVideoDecoder * decoder) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SINK); gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC); gst_v4l2_codec_h264_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 gint get_pixel_bitdepth (GstV4l2CodecH264Dec * self) { gint depth; switch (self->chroma_format_idc) { case 0: /* 4:0:0 */ depth = self->bitdepth; break; case 1: /* 4:2:0 */ depth = self->bitdepth + self->bitdepth / 2; break; case 2: /* 4:2:2 */ depth = 2 * self->bitdepth; break; case 3: /* 4:4:4 */ depth = 3 * self->bitdepth; break; default: GST_WARNING_OBJECT (self, "Unsupported chroma format %i", self->chroma_format_idc); depth = 0; break; } return depth; } static gboolean gst_v4l2_codec_h264_dec_negotiate (GstVideoDecoder * decoder) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); GstH264Decoder *h264dec = GST_H264_DECODER (decoder); /* *INDENT-OFF* */ struct v4l2_ext_control control[] = { { .id = V4L2_CID_STATELESS_H264_SPS, .ptr = &self->sps, .size = sizeof (self->sps), }, }; /* *INDENT-ON* */ GstCaps *filter, *caps; /* Ignore downstream renegotiation request. */ if (!self->need_negotiation) return TRUE; self->need_negotiation = FALSE; GST_DEBUG_OBJECT (self, "Negotiate"); gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SINK); gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC); gst_v4l2_codec_h264_dec_reset_allocation (self); if (!gst_v4l2_decoder_set_sink_fmt (self->decoder, V4L2_PIX_FMT_H264_SLICE, self->coded_width, self->coded_height, get_pixel_bitdepth (self))) { GST_ELEMENT_ERROR (self, CORE, NEGOTIATION, ("Failed to configure H264 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 bitdepth/chroma format"), ("No support for %ux%u %ubit chroma IDC %i", self->coded_width, self->coded_height, self->bitdepth, self->chroma_format_idc)); gst_caps_unref (caps); return FALSE; } gst_caps_unref (caps); 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->display_width, self->display_height, h264dec->input_state); if (self->interlaced) self->output_state->info.interlace_mode = GST_VIDEO_INTERLACE_MODE_MIXED; self->output_state->caps = gst_video_info_to_caps (&self->output_state->info); if (GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder)) { 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; } return TRUE; } return FALSE; } static gboolean gst_v4l2_codec_h264_dec_decide_allocation (GstVideoDecoder * decoder, GstQuery * query) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); guint min = 0, 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, self->min_pool_size + 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 void gst_v4l2_codec_h264_dec_fill_sequence (GstV4l2CodecH264Dec * self, const GstH264SPS * sps) { gint i; /* *INDENT-OFF* */ self->sps = (struct v4l2_ctrl_h264_sps) { .profile_idc = sps->profile_idc, .constraint_set_flags = (sps->constraint_set0_flag) | (sps->constraint_set1_flag << 1) | (sps->constraint_set2_flag << 2) | (sps->constraint_set3_flag << 3) | (sps->constraint_set4_flag << 4) | (sps->constraint_set5_flag << 5), .level_idc = sps->level_idc, .seq_parameter_set_id = sps->id, .chroma_format_idc = sps->chroma_format_idc, .bit_depth_luma_minus8 = sps->bit_depth_luma_minus8, .bit_depth_chroma_minus8 = sps->bit_depth_chroma_minus8, .log2_max_frame_num_minus4 = sps->log2_max_frame_num_minus4, .pic_order_cnt_type = sps->pic_order_cnt_type, .log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_pic_order_cnt_lsb_minus4, .max_num_ref_frames = sps->num_ref_frames, .num_ref_frames_in_pic_order_cnt_cycle = sps->num_ref_frames_in_pic_order_cnt_cycle, .offset_for_non_ref_pic = sps->offset_for_non_ref_pic, .offset_for_top_to_bottom_field = sps->offset_for_top_to_bottom_field, .pic_width_in_mbs_minus1 = sps->pic_width_in_mbs_minus1, .pic_height_in_map_units_minus1 = sps->pic_height_in_map_units_minus1, .flags = (sps->separate_colour_plane_flag ? V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE : 0) | (sps->qpprime_y_zero_transform_bypass_flag ? V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS : 0) | (sps->delta_pic_order_always_zero_flag ? V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO : 0) | (sps->gaps_in_frame_num_value_allowed_flag ? V4L2_H264_SPS_FLAG_GAPS_IN_FRAME_NUM_VALUE_ALLOWED : 0) | (sps->frame_mbs_only_flag ? V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY : 0) | (sps->mb_adaptive_frame_field_flag ? V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD : 0) | (sps->direct_8x8_inference_flag ? V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE : 0), }; /* *INDENT-ON* */ for (i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; i++) self->sps.offset_for_ref_frame[i] = sps->offset_for_ref_frame[i]; } static void gst_v4l2_codec_h264_dec_fill_pps (GstV4l2CodecH264Dec * self, GstH264PPS * pps) { /* *INDENT-OFF* */ self->pps = (struct v4l2_ctrl_h264_pps) { .pic_parameter_set_id = pps->id, .seq_parameter_set_id = pps->sequence->id, .num_slice_groups_minus1 = pps->num_slice_groups_minus1, .num_ref_idx_l0_default_active_minus1 = pps->num_ref_idx_l0_active_minus1, .num_ref_idx_l1_default_active_minus1 = pps->num_ref_idx_l1_active_minus1, .weighted_bipred_idc = pps->weighted_bipred_idc, .pic_init_qp_minus26 = pps->pic_init_qp_minus26, .pic_init_qs_minus26 = pps->pic_init_qs_minus26, .chroma_qp_index_offset = pps->chroma_qp_index_offset, .second_chroma_qp_index_offset = pps->second_chroma_qp_index_offset, .flags = 0 | (pps->entropy_coding_mode_flag ? V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE : 0) | (pps->pic_order_present_flag ? V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT : 0) | (pps->weighted_pred_flag ? V4L2_H264_PPS_FLAG_WEIGHTED_PRED : 0) | (pps->deblocking_filter_control_present_flag ? V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT : 0) | (pps->constrained_intra_pred_flag ? V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED : 0) | (pps->redundant_pic_cnt_present_flag ? V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT : 0) | (pps->transform_8x8_mode_flag ? V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE : 0) | (self->scaling_matrix_present ? V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT : 0), }; /* *INDENT-ON* */ } static void gst_v4l2_codec_h264_dec_fill_scaling_matrix (GstV4l2CodecH264Dec * self, GstH264PPS * pps) { gint i, n; for (i = 0; i < G_N_ELEMENTS (pps->scaling_lists_4x4); i++) gst_h264_quant_matrix_4x4_get_raster_from_zigzag (self-> scaling_matrix.scaling_list_4x4[i], pps->scaling_lists_4x4[i]); /* Avoid uninitialize data passed into ioctl() */ memset (self->scaling_matrix.scaling_list_8x8, 0, sizeof (self->scaling_matrix.scaling_list_8x8)); /* We need the first 2 entries (Y intra and Y inter for YCbCr 4:2:2 and * less, and the full 6 entries for 4:4:4, see Table 7-2 of the spec for * more details */ n = (pps->sequence->chroma_format_idc == 3) ? 6 : 2; for (i = 0; i < n; i++) gst_h264_quant_matrix_8x8_get_raster_from_zigzag (self-> scaling_matrix.scaling_list_8x8[i], pps->scaling_lists_8x8[i]); } static void gst_v4l2_codec_h264_dec_fill_decoder_params (GstV4l2CodecH264Dec * self, GstH264SliceHdr * slice_hdr, GstH264Picture * picture, GstH264Dpb * dpb) { GArray *refs = gst_h264_dpb_get_pictures_all (dpb); gint i, entry_id = 0; /* *INDENT-OFF* */ self->decode_params = (struct v4l2_ctrl_h264_decode_params) { .nal_ref_idc = picture->nal_ref_idc, .frame_num = slice_hdr->frame_num, .idr_pic_id = slice_hdr->idr_pic_id, .pic_order_cnt_lsb = slice_hdr->pic_order_cnt_lsb, .delta_pic_order_cnt_bottom = slice_hdr->delta_pic_order_cnt_bottom, .delta_pic_order_cnt0 = slice_hdr->delta_pic_order_cnt[0], .delta_pic_order_cnt1 = slice_hdr->delta_pic_order_cnt[1], .dec_ref_pic_marking_bit_size = slice_hdr->dec_ref_pic_marking.bit_size, .pic_order_cnt_bit_size = slice_hdr->pic_order_cnt_bit_size, .slice_group_change_cycle = slice_hdr->slice_group_change_cycle, .flags = (picture->idr ? V4L2_H264_DECODE_PARAM_FLAG_IDR_PIC : 0) | (slice_hdr->field_pic_flag ? V4L2_H264_DECODE_PARAM_FLAG_FIELD_PIC : 0) | (slice_hdr->bottom_field_flag ? V4L2_H264_DECODE_PARAM_FLAG_BOTTOM_FIELD : 0), }; switch (picture->field) { case GST_H264_PICTURE_FIELD_FRAME: self->decode_params.top_field_order_cnt = picture->top_field_order_cnt; self->decode_params.bottom_field_order_cnt = picture->bottom_field_order_cnt; break; case GST_H264_PICTURE_FIELD_TOP_FIELD: self->decode_params.top_field_order_cnt = picture->top_field_order_cnt; self->decode_params.bottom_field_order_cnt = 0; break; case GST_H264_PICTURE_FIELD_BOTTOM_FIELD: self->decode_params.top_field_order_cnt = 0; self->decode_params.bottom_field_order_cnt = picture->bottom_field_order_cnt; break; } for (i = 0; i < refs->len; i++) { GstH264Picture *ref_pic = g_array_index (refs, GstH264Picture *, i); gint pic_num = ref_pic->pic_num; gint frame_num = ref_pic->frame_num; struct v4l2_h264_dpb_entry *entry; /* Skip non-reference as they are not useful to decoding */ if (!GST_H264_PICTURE_IS_REF (ref_pic)) continue; /* The second field picture will be handled differently */ if (ref_pic->second_field) continue; /* V4L2 uAPI uses pic_num for both PicNum and LongTermPicNum, and * frame_num for both FrameNum and LongTermFrameIdx */ if (GST_H264_PICTURE_IS_LONG_TERM_REF (ref_pic)) { pic_num = ref_pic->long_term_pic_num; frame_num = ref_pic->long_term_frame_idx; } entry = &self->decode_params.dpb[entry_id++]; *entry = (struct v4l2_h264_dpb_entry) { /* * The reference is multiplied by 1000 because it's was set as micro * seconds and this TS is nanosecond. */ .reference_ts = (guint64) ref_pic->system_frame_number * 1000, .frame_num = frame_num, .pic_num = pic_num, .flags = V4L2_H264_DPB_ENTRY_FLAG_VALID | (GST_H264_PICTURE_IS_REF (ref_pic) ? V4L2_H264_DPB_ENTRY_FLAG_ACTIVE : 0) | (GST_H264_PICTURE_IS_LONG_TERM_REF (ref_pic) ? V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM : 0) | (ref_pic->field_pic_flag ? V4L2_H264_DPB_ENTRY_FLAG_FIELD : 0), }; /* *INDENT-ON* */ switch (ref_pic->field) { case GST_H264_PICTURE_FIELD_FRAME: entry->top_field_order_cnt = ref_pic->top_field_order_cnt; entry->bottom_field_order_cnt = ref_pic->bottom_field_order_cnt; entry->fields = V4L2_H264_FRAME_REF; break; case GST_H264_PICTURE_FIELD_TOP_FIELD: entry->top_field_order_cnt = ref_pic->top_field_order_cnt; entry->fields = V4L2_H264_TOP_FIELD_REF; if (ref_pic->other_field) { entry->bottom_field_order_cnt = ref_pic->other_field->bottom_field_order_cnt; entry->fields |= V4L2_H264_BOTTOM_FIELD_REF; } break; case GST_H264_PICTURE_FIELD_BOTTOM_FIELD: entry->bottom_field_order_cnt = ref_pic->bottom_field_order_cnt; entry->fields = V4L2_H264_BOTTOM_FIELD_REF; if (ref_pic->other_field) { entry->top_field_order_cnt = ref_pic->other_field->top_field_order_cnt; entry->fields |= V4L2_H264_TOP_FIELD_REF; } break; } } g_array_unref (refs); } static void gst_v4l2_codec_h264_dec_fill_pred_weight (GstV4l2CodecH264Dec * self, GstH264SliceHdr * slice_hdr) { gint i, j; /* *INDENT-OFF* */ self->pred_weight = (struct v4l2_ctrl_h264_pred_weights) { .luma_log2_weight_denom = slice_hdr->pred_weight_table.luma_log2_weight_denom, .chroma_log2_weight_denom = slice_hdr->pred_weight_table.chroma_log2_weight_denom, }; /* *INDENT-ON* */ for (i = 0; i <= slice_hdr->num_ref_idx_l0_active_minus1; i++) { self->pred_weight.weight_factors[0].luma_weight[i] = slice_hdr->pred_weight_table.luma_weight_l0[i]; self->pred_weight.weight_factors[0].luma_offset[i] = slice_hdr->pred_weight_table.luma_offset_l0[i]; } if (slice_hdr->pps->sequence->chroma_array_type != 0) { for (i = 0; i <= slice_hdr->num_ref_idx_l0_active_minus1; i++) { for (j = 0; j < 2; j++) { self->pred_weight.weight_factors[0].chroma_weight[i][j] = slice_hdr->pred_weight_table.chroma_weight_l0[i][j]; self->pred_weight.weight_factors[0].chroma_offset[i][j] = slice_hdr->pred_weight_table.chroma_offset_l0[i][j]; } } } /* Skip l1 if this is not a B-Frames. */ if (slice_hdr->type % 5 != GST_H264_B_SLICE) return; for (i = 0; i <= slice_hdr->num_ref_idx_l1_active_minus1; i++) { self->pred_weight.weight_factors[1].luma_weight[i] = slice_hdr->pred_weight_table.luma_weight_l1[i]; self->pred_weight.weight_factors[1].luma_offset[i] = slice_hdr->pred_weight_table.luma_offset_l1[i]; } if (slice_hdr->pps->sequence->chroma_array_type != 0) { for (i = 0; i <= slice_hdr->num_ref_idx_l1_active_minus1; i++) { for (j = 0; j < 2; j++) { self->pred_weight.weight_factors[1].chroma_weight[i][j] = slice_hdr->pred_weight_table.chroma_weight_l1[i][j]; self->pred_weight.weight_factors[1].chroma_offset[i][j] = slice_hdr->pred_weight_table.chroma_offset_l1[i][j]; } } } } static guint get_slice_header_bit_size (GstH264Slice * slice) { return 8 * slice->nalu.header_bytes + slice->header.header_size - 8 * slice->header.n_emulation_prevention_bytes; } static void gst_v4l2_codec_h264_dec_fill_slice_params (GstV4l2CodecH264Dec * self, GstH264Slice * slice) { gint n = self->num_slices++; gsize slice_size = slice->nalu.size; struct v4l2_ctrl_h264_slice_params *params; /* Ensure array is large enough */ if (self->slice_params->len < self->num_slices) g_array_set_size (self->slice_params, self->slice_params->len * 2); if (needs_start_codes (self)) slice_size += 3; /* *INDENT-OFF* */ params = &g_array_index (self->slice_params, struct v4l2_ctrl_h264_slice_params, n); *params = (struct v4l2_ctrl_h264_slice_params) { .header_bit_size = get_slice_header_bit_size (slice), .first_mb_in_slice = slice->header.first_mb_in_slice, .slice_type = slice->header.type % 5, .colour_plane_id = slice->header.colour_plane_id, .redundant_pic_cnt = slice->header.redundant_pic_cnt, .cabac_init_idc = slice->header.cabac_init_idc, .slice_qp_delta = slice->header.slice_qp_delta, .slice_qs_delta = slice->header.slice_qs_delta, .disable_deblocking_filter_idc = slice->header.disable_deblocking_filter_idc, .slice_alpha_c0_offset_div2 = slice->header.slice_alpha_c0_offset_div2, .slice_beta_offset_div2 = slice->header.slice_beta_offset_div2, .num_ref_idx_l0_active_minus1 = slice->header.num_ref_idx_l0_active_minus1, .num_ref_idx_l1_active_minus1 = slice->header.num_ref_idx_l1_active_minus1, .flags = (slice->header.direct_spatial_mv_pred_flag ? V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED : 0) | (slice->header.sp_for_switch_flag ? V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH : 0), }; /* *INDENT-ON* */ } static guint8 lookup_dpb_index (struct v4l2_h264_dpb_entry dpb[16], GstH264Picture * ref_pic) { guint64 ref_ts; gint i; /* Reference list may have wholes in case a ref is missing, we should mark * the whole and avoid moving items in the list */ if (!ref_pic) return 0xff; /* DPB entries only stores first field in a merged fashion */ if (ref_pic->second_field && ref_pic->other_field) ref_pic = ref_pic->other_field; ref_ts = (guint64) ref_pic->system_frame_number * 1000; for (i = 0; i < 16; i++) { if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE && dpb[i].reference_ts == ref_ts) return i; } return 0xff; } static guint _get_v4l2_fields_ref (GstH264Picture * ref_pic, gboolean merge) { if (merge && ref_pic->other_field) return V4L2_H264_FRAME_REF; switch (ref_pic->field) { case GST_H264_PICTURE_FIELD_FRAME: return V4L2_H264_FRAME_REF; break; case GST_H264_PICTURE_FIELD_TOP_FIELD: return V4L2_H264_TOP_FIELD_REF; break; case GST_H264_PICTURE_FIELD_BOTTOM_FIELD: return V4L2_H264_BOTTOM_FIELD_REF; break; } return V4L2_H264_FRAME_REF; } static void gst_v4l2_codec_h264_dec_fill_references (GstV4l2CodecH264Dec * self, gboolean cur_is_frame, GArray * ref_pic_list0, GArray * ref_pic_list1) { struct v4l2_ctrl_h264_slice_params *slice_params; gint i; slice_params = &g_array_index (self->slice_params, struct v4l2_ctrl_h264_slice_params, 0); memset (slice_params->ref_pic_list0, 0xff, sizeof (slice_params->ref_pic_list0)); memset (slice_params->ref_pic_list1, 0xff, sizeof (slice_params->ref_pic_list1)); for (i = 0; i < ref_pic_list0->len; i++) { GstH264Picture *ref_pic = g_array_index (ref_pic_list0, GstH264Picture *, i); slice_params->ref_pic_list0[i].index = lookup_dpb_index (self->decode_params.dpb, ref_pic); slice_params->ref_pic_list0[i].fields = _get_v4l2_fields_ref (ref_pic, cur_is_frame); } for (i = 0; i < ref_pic_list1->len; i++) { GstH264Picture *ref_pic = g_array_index (ref_pic_list1, GstH264Picture *, i); slice_params->ref_pic_list1[i].index = lookup_dpb_index (self->decode_params.dpb, ref_pic); slice_params->ref_pic_list1[i].fields = _get_v4l2_fields_ref (ref_pic, cur_is_frame); } } static GstFlowReturn gst_v4l2_codec_h264_dec_new_sequence (GstH264Decoder * decoder, const GstH264SPS * sps, gint max_dpb_size) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); gint crop_width = sps->width; gint crop_height = sps->height; gboolean negotiation_needed = FALSE; gboolean interlaced; if (self->vinfo.finfo->format == GST_VIDEO_FORMAT_UNKNOWN) negotiation_needed = TRUE; /* TODO check if CREATE_BUFS is supported, and simply grow the pool */ if (self->min_pool_size < max_dpb_size) { self->min_pool_size = max_dpb_size; negotiation_needed = TRUE; } if (sps->frame_cropping_flag) { crop_width = sps->crop_rect_width; crop_height = sps->crop_rect_height; } /* TODO Check if current buffers are large enough, and reuse them */ if (self->display_width != crop_width || self->display_height != crop_height || self->coded_width != sps->width || self->coded_height != sps->height) { self->display_width = crop_width; self->display_height = crop_height; self->coded_width = sps->width; self->coded_height = sps->height; negotiation_needed = TRUE; GST_INFO_OBJECT (self, "Resolution changed to %dx%d (%ix%i)", self->display_width, self->display_height, self->coded_width, self->coded_height); } interlaced = !sps->frame_mbs_only_flag; if (self->interlaced != interlaced) { self->interlaced = interlaced; negotiation_needed = TRUE; GST_INFO_OBJECT (self, "Interlaced mode changed to %d", interlaced); } if (self->bitdepth != sps->bit_depth_luma_minus8 + 8) { self->bitdepth = sps->bit_depth_luma_minus8 + 8; negotiation_needed = TRUE; GST_INFO_OBJECT (self, "Bitdepth changed to %u", self->bitdepth); } if (self->chroma_format_idc != sps->chroma_format_idc) { self->chroma_format_idc = sps->chroma_format_idc; negotiation_needed = TRUE; GST_INFO_OBJECT (self, "Chroma format changed to %i", self->chroma_format_idc); } gst_v4l2_codec_h264_dec_fill_sequence (self, sps); self->need_sequence = TRUE; if (negotiation_needed) { self->need_negotiation = TRUE; if (!gst_video_decoder_negotiate (GST_VIDEO_DECODER (self))) { GST_ERROR_OBJECT (self, "Failed to negotiate with downstream"); return GST_FLOW_NOT_NEGOTIATED; } } /* 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->display_width, self->display_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 gboolean gst_v4l2_codec_h264_dec_ensure_bitstream (GstV4l2CodecH264Dec * self) { if (self->bitstream) goto done; self->bitstream = gst_v4l2_codec_allocator_alloc (self->sink_allocator); if (!self->bitstream) { GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT, ("Not enough memory to decode H264 stream."), (NULL)); return FALSE; } if (!gst_memory_map (self->bitstream, &self->bitstream_map, GST_MAP_WRITE)) { GST_ELEMENT_ERROR (self, RESOURCE, WRITE, ("Could not access bitstream memory for writing"), (NULL)); g_clear_pointer (&self->bitstream, gst_memory_unref); return FALSE; } done: /* We use this field to track how much we have written */ self->bitstream_map.size = 0; return TRUE; } static GstFlowReturn gst_v4l2_codec_h264_dec_start_picture (GstH264Decoder * decoder, GstH264Picture * picture, GstH264Slice * slice, GstH264Dpb * dpb) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); /* FIXME base class should not call us if negotiation failed */ if (!self->sink_allocator) return GST_FLOW_NOT_NEGOTIATED; if (!gst_v4l2_codec_h264_dec_ensure_bitstream (self)) return GST_FLOW_ERROR; /* * Scaling matrix is present if there's one provided * by either the SPS or the PPS. This flag must be * set to true or false, before filling the PPS V4L2 control. */ self->scaling_matrix_present = slice->header.pps->sequence->scaling_matrix_present_flag || slice->header.pps->pic_scaling_matrix_present_flag; gst_v4l2_codec_h264_dec_fill_pps (self, slice->header.pps); if (self->scaling_matrix_present) gst_v4l2_codec_h264_dec_fill_scaling_matrix (self, slice->header.pps); gst_v4l2_codec_h264_dec_fill_decoder_params (self, &slice->header, picture, dpb); self->first_slice = TRUE; return GST_FLOW_OK; } static gboolean gst_v4l2_codec_h264_dec_copy_output_buffer (GstV4l2CodecH264Dec * 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->display_width, self->display_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->display_width; GST_VIDEO_INFO_HEIGHT (&src_frame.info) = self->display_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 GstFlowReturn gst_v4l2_codec_h264_dec_output_picture (GstH264Decoder * decoder, GstVideoCodecFrame * frame, GstH264Picture * picture) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); GstVideoDecoder *vdec = GST_VIDEO_DECODER (decoder); GstV4l2Request *request = gst_h264_picture_get_user_data (picture); gint ret; GST_DEBUG_OBJECT (self, "Output picture %u", picture->system_frame_number); ret = gst_v4l2_request_set_done (request); if (ret == 0) { GST_ELEMENT_ERROR (self, STREAM, DECODE, ("Decoding frame %u took too long", picture->system_frame_number), (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_h264_picture_set_user_data (picture, gst_buffer_ref (frame->output_buffer), (GDestroyNotify) gst_buffer_unref); if (self->copy_frames) gst_v4l2_codec_h264_dec_copy_output_buffer (self, frame); gst_h264_picture_unref (picture); return gst_video_decoder_finish_frame (vdec, frame); error: gst_video_decoder_drop_frame (vdec, frame); gst_h264_picture_unref (picture); return GST_FLOW_ERROR; } static void gst_v4l2_codec_h264_dec_reset_picture (GstV4l2CodecH264Dec * 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; } self->num_slices = 0; } static gboolean gst_v4l2_codec_h264_dec_ensure_output_buffer (GstV4l2CodecH264Dec * self, GstVideoCodecFrame * frame) { GstBuffer *buffer; GstFlowReturn flow_ret; if (frame->output_buffer) return TRUE; flow_ret = gst_buffer_pool_acquire_buffer (GST_BUFFER_POOL (self->src_pool), &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 (self, RESOURCE, WRITE, ("No more picture buffer available."), (NULL)); return FALSE; } frame->output_buffer = buffer; return TRUE; } static gboolean gst_v4l2_codec_h264_dec_submit_bitstream (GstV4l2CodecH264Dec * self, GstH264Picture * picture, guint flags) { GstV4l2Request *prev_request, *request = NULL; gsize bytesused; gboolean ret = FALSE; guint count = 0; /* *INDENT-OFF* */ /* Reserve space for controls */ struct v4l2_ext_control control[] = { { }, /* SPS */ { }, /* PPS */ { }, /* DECODE_PARAMS */ { }, /* SLICE_PARAMS */ { }, /* SCALING_MATRIX */ { }, /* PRED_WEIGHTS */ }; /* *INDENT-ON* */ prev_request = gst_h264_picture_get_user_data (picture); 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); if (prev_request) { request = gst_v4l2_decoder_alloc_sub_request (self->decoder, prev_request, self->bitstream); } else { GstVideoCodecFrame *frame; frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (self), picture->system_frame_number); g_return_val_if_fail (frame, FALSE); if (!gst_v4l2_codec_h264_dec_ensure_output_buffer (self, frame)) goto done; 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 (self, RESOURCE, NO_SPACE_LEFT, ("Failed to allocate a media request object."), (NULL)); goto done; } if (self->need_sequence) { control[count].id = V4L2_CID_STATELESS_H264_SPS; control[count].ptr = &self->sps; control[count].size = sizeof (self->sps); count++; self->need_sequence = FALSE; } if (self->first_slice) { control[count].id = V4L2_CID_STATELESS_H264_PPS; control[count].ptr = &self->pps; control[count].size = sizeof (self->pps); count++; if (self->scaling_matrix_present) { control[count].id = V4L2_CID_STATELESS_H264_SCALING_MATRIX; control[count].ptr = &self->scaling_matrix; control[count].size = sizeof (self->scaling_matrix); count++; } control[count].id = V4L2_CID_STATELESS_H264_DECODE_PARAMS; control[count].ptr = &self->decode_params; control[count].size = sizeof (self->decode_params); count++; self->first_slice = FALSE; } /* If it's not slice-based then it doesn't support per-slice controls. */ if (is_slice_based (self)) { control[count].id = V4L2_CID_STATELESS_H264_SLICE_PARAMS; control[count].ptr = self->slice_params->data; control[count].size = g_array_get_element_size (self->slice_params) * self->num_slices; count++; control[count].id = V4L2_CID_STATELESS_H264_PRED_WEIGHTS; control[count].ptr = &self->pred_weight; control[count].size = sizeof (self->pred_weight); count++; } if (!gst_v4l2_decoder_set_controls (self->decoder, request, control, count)) { GST_ELEMENT_ERROR (self, RESOURCE, WRITE, ("Driver did not accept the bitstream parameters."), (NULL)); goto done; } if (!gst_v4l2_request_queue (request, flags)) { GST_ELEMENT_ERROR (self, RESOURCE, WRITE, ("Driver did not accept the decode request."), (NULL)); goto done; } gst_h264_picture_set_user_data (picture, g_steal_pointer (&request), (GDestroyNotify) gst_v4l2_request_unref); ret = TRUE; done: if (request) gst_v4l2_request_unref (request); gst_v4l2_codec_h264_dec_reset_picture (self); return ret; } static GstFlowReturn gst_v4l2_codec_h264_dec_decode_slice (GstH264Decoder * decoder, GstH264Picture * picture, GstH264Slice * slice, GArray * ref_pic_list0, GArray * ref_pic_list1) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); gsize sc_off = 0; gsize nal_size; guint8 *bitstream_data; if (is_slice_based (self)) { if (self->bitstream_map.size) { /* In slice mode, we submit the pending slice asking the accelerator to * hold on the picture */ if (!gst_v4l2_codec_h264_dec_submit_bitstream (self, picture, V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF) || !gst_v4l2_codec_h264_dec_ensure_bitstream (self)) return GST_FLOW_ERROR; } gst_v4l2_codec_h264_dec_fill_slice_params (self, slice); gst_v4l2_codec_h264_dec_fill_pred_weight (self, &slice->header); gst_v4l2_codec_h264_dec_fill_references (self, GST_H264_PICTURE_IS_FRAME (picture), ref_pic_list0, ref_pic_list1); } bitstream_data = self->bitstream_map.data + self->bitstream_map.size; if (needs_start_codes (self)) sc_off = 3; nal_size = sc_off + slice->nalu.size; if (self->bitstream_map.size + nal_size > self->bitstream_map.maxsize) { GST_ELEMENT_ERROR (decoder, RESOURCE, NO_SPACE_LEFT, ("Not enough space to send all slice of an H264 frame."), (NULL)); return GST_FLOW_ERROR; } if (needs_start_codes (self)) { bitstream_data[0] = 0x00; bitstream_data[1] = 0x00; bitstream_data[2] = 0x01; } memcpy (bitstream_data + sc_off, slice->nalu.data + slice->nalu.offset, slice->nalu.size); self->bitstream_map.size += nal_size; return GST_FLOW_OK; } static GstFlowReturn gst_v4l2_codec_h264_dec_end_picture (GstH264Decoder * decoder, GstH264Picture * picture) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); guint flags = 0; /* Hold on the output frame if this is first field of a pair */ if (picture->field != GST_H264_PICTURE_FIELD_FRAME && !picture->second_field) flags = V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF; if (!gst_v4l2_codec_h264_dec_submit_bitstream (self, picture, flags)) return GST_FLOW_ERROR; return GST_FLOW_OK; } static GstFlowReturn gst_v4l2_codec_h264_dec_new_field_picture (GstH264Decoder * decoder, GstH264Picture * first_field, GstH264Picture * second_field) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); GstV4l2Request *request = gst_h264_picture_get_user_data (first_field); if (!request) { GST_WARNING_OBJECT (self, "First picture does not have an associated request"); return GST_FLOW_OK; } GST_DEBUG_OBJECT (self, "Assigned request %i to second field.", gst_v4l2_request_get_fd (request)); /* Associate the previous request with the new picture so that * submit_bitstream can create sub-request */ gst_h264_picture_set_user_data (second_field, gst_v4l2_request_ref (request), (GDestroyNotify) gst_v4l2_request_unref); return GST_FLOW_OK; } static guint gst_v4l2_codec_h264_dec_get_preferred_output_delay (GstH264Decoder * decoder, gboolean live) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); guint delay; if (live) delay = 0; else /* Just one for now, perhaps we can make this configurable in the future. */ delay = 1; gst_v4l2_decoder_set_render_delay (self->decoder, delay); return delay; } static void gst_v4l2_codec_h264_dec_set_flushing (GstV4l2CodecH264Dec * 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_h264_dec_flush (GstVideoDecoder * decoder) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); GST_DEBUG_OBJECT (self, "Flushing decoder state."); gst_v4l2_decoder_flush (self->decoder); gst_v4l2_codec_h264_dec_set_flushing (self, FALSE); return GST_VIDEO_DECODER_CLASS (parent_class)->flush (decoder); } static gboolean gst_v4l2_codec_h264_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: GST_DEBUG_OBJECT (self, "flush start"); gst_v4l2_codec_h264_dec_set_flushing (self, TRUE); break; default: break; } return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event); } static GstStateChangeReturn gst_v4l2_codec_h264_dec_change_state (GstElement * element, GstStateChange transition) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (element); if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) gst_v4l2_codec_h264_dec_set_flushing (self, TRUE); return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); } static void gst_v4l2_codec_h264_dec_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_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_h264_dec_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_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_h264_dec_init (GstV4l2CodecH264Dec * self) { } static void gst_v4l2_codec_h264_dec_subinit (GstV4l2CodecH264Dec * self, GstV4l2CodecH264DecClass * klass) { self->decoder = gst_v4l2_decoder_new (klass->device); gst_video_info_init (&self->vinfo); self->slice_params = g_array_sized_new (FALSE, TRUE, sizeof (struct v4l2_ctrl_h264_slice_params), 4); } static void gst_v4l2_codec_h264_dec_dispose (GObject * object) { GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (object); g_clear_object (&self->decoder); g_clear_pointer (&self->slice_params, g_array_unref); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_v4l2_codec_h264_dec_class_init (GstV4l2CodecH264DecClass * klass) { } static void gst_v4l2_codec_h264_dec_subclass_init (GstV4l2CodecH264DecClass * 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); GstH264DecoderClass *h264decoder_class = GST_H264_DECODER_CLASS (klass); gobject_class->set_property = gst_v4l2_codec_h264_dec_set_property; gobject_class->get_property = gst_v4l2_codec_h264_dec_get_property; gobject_class->dispose = gst_v4l2_codec_h264_dec_dispose; gst_element_class_set_static_metadata (element_class, "V4L2 Stateless H.264 Video Decoder", "Codec/Decoder/Video/Hardware", "A V4L2 based H.264 video decoder", "Nicolas Dufresne "); 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_h264_dec_change_state); decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_open); decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_close); decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_stop); decoder_class->negotiate = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_negotiate); decoder_class->decide_allocation = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_decide_allocation); decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_flush); decoder_class->sink_event = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_sink_event); h264decoder_class->new_sequence = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_new_sequence); h264decoder_class->output_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_output_picture); h264decoder_class->start_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_start_picture); h264decoder_class->decode_slice = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_decode_slice); h264decoder_class->end_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_end_picture); h264decoder_class->new_field_picture = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_new_field_picture); h264decoder_class->get_preferred_output_delay = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_get_preferred_output_delay); klass->device = device; gst_v4l2_decoder_install_properties (gobject_class, PROP_LAST, device); } void gst_v4l2_codec_h264_dec_register (GstPlugin * plugin, GstV4l2Decoder * decoder, GstV4l2CodecDevice * device, guint rank) { GstCaps *src_caps; guint version; GST_DEBUG_CATEGORY_INIT (v4l2_h264dec_debug, "v4l2codecs-h264dec", 0, "V4L2 stateless h264 decoder"); if (!gst_v4l2_decoder_set_sink_fmt (decoder, V4L2_PIX_FMT_H264_SLICE, 320, 240, 8)) return; src_caps = gst_v4l2_decoder_enum_src_formats (decoder); if (gst_caps_is_empty (src_caps)) { GST_WARNING ("Not registering H264 decoder since it produces no " "supported format"); goto done; } version = gst_v4l2_decoder_get_version (decoder); if (version < V4L2_MIN_KERNEL_VERSION) GST_WARNING ("V4L2 API v%u.%u too old, at least v%u.%u required", (version >> 16) & 0xff, (version >> 8) & 0xff, V4L2_MIN_KERNEL_VER_MAJOR, V4L2_MIN_KERNEL_VER_MINOR); if (!gst_v4l2_decoder_h264_api_check (decoder)) { GST_WARNING ("Not registering H264 decoder as it failed ABI check."); goto done; } gst_v4l2_decoder_register (plugin, GST_TYPE_V4L2_CODEC_H264_DEC, (GClassInitFunc) gst_v4l2_codec_h264_dec_subclass_init, gst_mini_object_ref (GST_MINI_OBJECT (device)), (GInstanceInitFunc) gst_v4l2_codec_h264_dec_subinit, "v4l2sl%sh264dec", device, rank, NULL); done: gst_caps_unref (src_caps); }