/* GStreamer H.264 Parser * Copyright (C) <2010> Collabora ltd * Copyright (C) <2010> Nokia Corporation * Copyright (C) <2011> Intel Corporation * * Copyright (C) <2010> Mark Nauwelaerts * Copyright (C) <2011> Thibault Saunier * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "gsth264parse.h" #include GST_DEBUG_CATEGORY (h264_parse_debug); #define GST_CAT_DEFAULT h264_parse_debug #define DEFAULT_CONFIG_INTERVAL (0) enum { PROP_0, PROP_CONFIG_INTERVAL, PROP_LAST }; enum { GST_H264_PARSE_FORMAT_NONE, GST_H264_PARSE_FORMAT_AVC, GST_H264_PARSE_FORMAT_BYTE }; enum { GST_H264_PARSE_ALIGN_NONE = 0, GST_H264_PARSE_ALIGN_NAL, GST_H264_PARSE_ALIGN_AU }; static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-h264")); static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-h264, parsed = (boolean) true, " "stream-format=(string) { avc, byte-stream }, " "alignment=(string) { au, nal }")); #define parent_class gst_h264_parse_parent_class G_DEFINE_TYPE (GstH264Parse, gst_h264_parse, GST_TYPE_BASE_PARSE); static void gst_h264_parse_finalize (GObject * object); static gboolean gst_h264_parse_start (GstBaseParse * parse); static gboolean gst_h264_parse_stop (GstBaseParse * parse); static gboolean gst_h264_parse_check_valid_frame (GstBaseParse * parse, GstBaseParseFrame * frame, guint * framesize, gint * skipsize); static GstFlowReturn gst_h264_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame); static GstFlowReturn gst_h264_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame); static void gst_h264_parse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_h264_parse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static gboolean gst_h264_parse_set_caps (GstBaseParse * parse, GstCaps * caps); static GstCaps *gst_h264_parse_get_caps (GstBaseParse * parse, GstCaps * filter); static GstFlowReturn gst_h264_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer); static gboolean gst_h264_parse_event (GstBaseParse * parse, GstEvent * event); static gboolean gst_h264_parse_src_event (GstBaseParse * parse, GstEvent * event); static void gst_h264_parse_class_init (GstH264ParseClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); GST_DEBUG_CATEGORY_INIT (h264_parse_debug, "h264parse", 0, "h264 parser"); gobject_class->finalize = gst_h264_parse_finalize; gobject_class->set_property = gst_h264_parse_set_property; gobject_class->get_property = gst_h264_parse_get_property; g_object_class_install_property (gobject_class, PROP_CONFIG_INTERVAL, g_param_spec_uint ("config-interval", "SPS PPS Send Interval", "Send SPS and PPS Insertion Interval in seconds (sprop parameter sets " "will be multiplexed in the data stream when detected.) (0 = disabled)", 0, 3600, DEFAULT_CONFIG_INTERVAL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS)); /* Override BaseParse vfuncs */ parse_class->start = GST_DEBUG_FUNCPTR (gst_h264_parse_start); parse_class->stop = GST_DEBUG_FUNCPTR (gst_h264_parse_stop); parse_class->check_valid_frame = GST_DEBUG_FUNCPTR (gst_h264_parse_check_valid_frame); parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_h264_parse_parse_frame); parse_class->pre_push_frame = GST_DEBUG_FUNCPTR (gst_h264_parse_pre_push_frame); parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_h264_parse_set_caps); parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_h264_parse_get_caps); parse_class->event = GST_DEBUG_FUNCPTR (gst_h264_parse_event); parse_class->src_event = GST_DEBUG_FUNCPTR (gst_h264_parse_src_event); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&srctemplate)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&sinktemplate)); gst_element_class_set_details_simple (gstelement_class, "H.264 parser", "Codec/Parser/Converter/Video", "Parses H.264 streams", "Mark Nauwelaerts "); } static void gst_h264_parse_init (GstH264Parse * h264parse) { h264parse->frame_out = gst_adapter_new (); /* retrieve and intercept baseparse. * Quite HACKish, but fairly OK since it is needed to perform avc packet * splitting, which is the penultimate de-parsing */ h264parse->parse_chain = GST_PAD_CHAINFUNC (GST_BASE_PARSE_SINK_PAD (h264parse)); gst_pad_set_chain_function (GST_BASE_PARSE_SINK_PAD (h264parse), gst_h264_parse_chain); } static void gst_h264_parse_finalize (GObject * object) { GstH264Parse *h264parse = GST_H264_PARSE (object); g_object_unref (h264parse->frame_out); G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_h264_parse_reset_frame (GstH264Parse * h264parse) { GST_DEBUG_OBJECT (h264parse, "reset frame"); /* done parsing; reset state */ h264parse->nalu.valid = FALSE; h264parse->nalu.offset = 0; h264parse->nalu.sc_offset = 0; h264parse->nalu.size = 0; h264parse->current_off = 0; h264parse->picture_start = FALSE; h264parse->update_caps = FALSE; h264parse->idr_pos = -1; h264parse->keyframe = FALSE; h264parse->frame_start = FALSE; gst_adapter_clear (h264parse->frame_out); } static void gst_h264_parse_reset (GstH264Parse * h264parse) { h264parse->width = 0; h264parse->height = 0; h264parse->fps_num = 0; h264parse->fps_den = 0; h264parse->aspect_ratio_idc = 0; h264parse->sar_width = 0; h264parse->sar_height = 0; h264parse->upstream_par_n = -1; h264parse->upstream_par_d = -1; gst_buffer_replace (&h264parse->codec_data, NULL); h264parse->nal_length_size = 4; h264parse->packetized = FALSE; h264parse->align = GST_H264_PARSE_ALIGN_NONE; h264parse->format = GST_H264_PARSE_FORMAT_NONE; h264parse->last_report = GST_CLOCK_TIME_NONE; h264parse->push_codec = FALSE; h264parse->have_pps = FALSE; h264parse->have_sps = FALSE; h264parse->dts = GST_CLOCK_TIME_NONE; h264parse->ts_trn_nb = GST_CLOCK_TIME_NONE; h264parse->do_ts = TRUE; h264parse->pending_key_unit_ts = GST_CLOCK_TIME_NONE; h264parse->force_key_unit_event = NULL; gst_h264_parse_reset_frame (h264parse); } static gboolean gst_h264_parse_start (GstBaseParse * parse) { GstH264Parse *h264parse = GST_H264_PARSE (parse); GST_DEBUG_OBJECT (parse, "start"); gst_h264_parse_reset (h264parse); h264parse->nalparser = gst_h264_nal_parser_new (); h264parse->dts = GST_CLOCK_TIME_NONE; h264parse->ts_trn_nb = GST_CLOCK_TIME_NONE; h264parse->sei_pic_struct_pres_flag = FALSE; h264parse->sei_pic_struct = 0; h264parse->field_pic_flag = 0; gst_base_parse_set_min_frame_size (parse, 6); return TRUE; } static gboolean gst_h264_parse_stop (GstBaseParse * parse) { guint i; GstH264Parse *h264parse = GST_H264_PARSE (parse); GST_DEBUG_OBJECT (parse, "stop"); gst_h264_parse_reset (h264parse); for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) gst_buffer_replace (&h264parse->sps_nals[i], NULL); for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) gst_buffer_replace (&h264parse->pps_nals[i], NULL); gst_h264_nal_parser_free (h264parse->nalparser); return TRUE; } static const gchar * gst_h264_parse_get_string (GstH264Parse * parse, gboolean format, gint code) { if (format) { switch (code) { case GST_H264_PARSE_FORMAT_AVC: return "avc"; case GST_H264_PARSE_FORMAT_BYTE: return "byte-stream"; default: return "none"; } } else { switch (code) { case GST_H264_PARSE_ALIGN_NAL: return "nal"; case GST_H264_PARSE_ALIGN_AU: return "au"; default: return "none"; } } } static void gst_h264_parse_format_from_caps (GstCaps * caps, guint * format, guint * align) { if (format) *format = GST_H264_PARSE_FORMAT_NONE; if (align) *align = GST_H264_PARSE_ALIGN_NONE; if (caps && gst_caps_get_size (caps) > 0) { GstStructure *s = gst_caps_get_structure (caps, 0); const gchar *str = NULL; if (format) { if ((str = gst_structure_get_string (s, "stream-format"))) { if (strcmp (str, "avc") == 0) *format = GST_H264_PARSE_FORMAT_AVC; else if (strcmp (str, "byte-stream") == 0) *format = GST_H264_PARSE_FORMAT_BYTE; } } if (align) { if ((str = gst_structure_get_string (s, "alignment"))) { if (strcmp (str, "au") == 0) *align = GST_H264_PARSE_ALIGN_AU; else if (strcmp (str, "nal") == 0) *align = GST_H264_PARSE_ALIGN_NAL; } } } } /* check downstream caps to configure format and alignment */ static void gst_h264_parse_negotiate (GstH264Parse * h264parse, GstCaps * in_caps) { GstCaps *caps; guint format = GST_H264_PARSE_FORMAT_NONE; guint align = GST_H264_PARSE_ALIGN_NONE; caps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (h264parse)); GST_DEBUG_OBJECT (h264parse, "allowed caps: %" GST_PTR_FORMAT, caps); if (in_caps && caps) { if (gst_caps_can_intersect (in_caps, caps)) { GST_DEBUG_OBJECT (h264parse, "downstream accepts upstream caps"); gst_h264_parse_format_from_caps (in_caps, &format, &align); gst_caps_unref (caps); caps = NULL; } } if (caps) { gst_h264_parse_format_from_caps (caps, &format, &align); gst_caps_unref (caps); } /* default */ if (!format) format = GST_H264_PARSE_FORMAT_BYTE; if (!align) align = GST_H264_PARSE_ALIGN_AU; GST_DEBUG_OBJECT (h264parse, "selected format %s, alignment %s", gst_h264_parse_get_string (h264parse, TRUE, format), gst_h264_parse_get_string (h264parse, FALSE, align)); h264parse->format = format; h264parse->align = align; } static GstBuffer * gst_h264_parse_wrap_nal (GstH264Parse * h264parse, guint format, guint8 * data, guint size) { GstBuffer *buf; guint nl = h264parse->nal_length_size; guint32 tmp; GST_DEBUG_OBJECT (h264parse, "nal length %d", size); buf = gst_buffer_new_allocate (NULL, nl + size, 0); if (format == GST_H264_PARSE_FORMAT_AVC) { tmp = GUINT32_TO_BE (size << (32 - 8 * nl)); } else { /* HACK: nl should always be 4 here, otherwise this won't work. * There are legit cases where nl in avc stream is 2, but byte-stream * SC is still always 4 bytes. */ nl = 4; tmp = GUINT32_TO_BE (1); } gst_buffer_fill (buf, 0, &tmp, sizeof (guint32)); gst_buffer_fill (buf, nl, data, size); return buf; } static void gst_h264_parser_store_nal (GstH264Parse * h264parse, guint id, GstH264NalUnitType naltype, GstH264NalUnit * nalu) { GstBuffer *buf, **store; guint size = nalu->size, store_size; if (naltype == GST_H264_NAL_SPS) { store_size = GST_H264_MAX_SPS_COUNT; store = h264parse->sps_nals; GST_DEBUG_OBJECT (h264parse, "storing sps %u", id); } else if (naltype == GST_H264_NAL_PPS) { store_size = GST_H264_MAX_PPS_COUNT; store = h264parse->pps_nals; GST_DEBUG_OBJECT (h264parse, "storing pps %u", id); } else return; if (id >= store_size) { GST_DEBUG_OBJECT (h264parse, "unable to store nal, id out-of-range %d", id); return; } buf = gst_buffer_new_allocate (NULL, size, 0); gst_buffer_fill (buf, 0, nalu->data + nalu->offset, size); if (store[id]) gst_buffer_unref (store[id]); store[id] = buf; } /* SPS/PPS/IDR considered key, all others DELTA; * so downstream waiting for keyframe can pick up at SPS/PPS/IDR */ #define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8)) /* caller guarantees 2 bytes of nal payload */ static void gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu) { guint nal_type; GstH264PPS pps; GstH264SPS sps; GstH264SEIMessage sei; GstH264NalParser *nalparser = h264parse->nalparser; /* nothing to do for broken input */ if (G_UNLIKELY (nalu->size < 2)) { GST_DEBUG_OBJECT (h264parse, "not processing nal size %u", nalu->size); return; } /* we have a peek as well */ nal_type = nalu->type; h264parse->keyframe |= NAL_TYPE_IS_KEY (nal_type); GST_DEBUG_OBJECT (h264parse, "processing nal of type %u, size %u", nal_type, nalu->size); switch (nal_type) { case GST_H264_NAL_SPS: gst_h264_parser_parse_sps (nalparser, nalu, &sps, TRUE); GST_DEBUG_OBJECT (h264parse, "triggering src caps check"); h264parse->update_caps = TRUE; h264parse->have_sps = TRUE; if (h264parse->push_codec && h264parse->have_pps) { /* SPS and PPS found in stream before the first pre_push_frame, no need * to forcibly push at start */ GST_INFO_OBJECT (h264parse, "have SPS/PPS in stream"); h264parse->push_codec = FALSE; h264parse->have_sps = FALSE; h264parse->have_pps = FALSE; } gst_h264_parser_store_nal (h264parse, sps.id, nal_type, nalu); break; case GST_H264_NAL_PPS: gst_h264_parser_parse_pps (nalparser, nalu, &pps); /* parameters might have changed, force caps check */ GST_DEBUG_OBJECT (h264parse, "triggering src caps check"); h264parse->update_caps = TRUE; h264parse->have_pps = TRUE; if (h264parse->push_codec && h264parse->have_sps) { /* SPS and PPS found in stream before the first pre_push_frame, no need * to forcibly push at start */ GST_INFO_OBJECT (h264parse, "have SPS/PPS in stream"); h264parse->push_codec = FALSE; h264parse->have_sps = FALSE; h264parse->have_pps = FALSE; } gst_h264_parser_store_nal (h264parse, pps.id, nal_type, nalu); break; case GST_H264_NAL_SEI: gst_h264_parser_parse_sei (nalparser, nalu, &sei); switch (sei.payloadType) { case GST_H264_SEI_PIC_TIMING: h264parse->sei_pic_struct_pres_flag = sei.pic_timing.pic_struct_present_flag; h264parse->sei_cpb_removal_delay = sei.pic_timing.cpb_removal_delay; if (h264parse->sei_pic_struct_pres_flag) h264parse->sei_pic_struct = sei.pic_timing.pic_struct; break; case GST_H264_SEI_BUF_PERIOD: if (h264parse->ts_trn_nb == GST_CLOCK_TIME_NONE || h264parse->dts == GST_CLOCK_TIME_NONE) h264parse->ts_trn_nb = 0; else h264parse->ts_trn_nb = h264parse->dts; GST_LOG_OBJECT (h264parse, "new buffering period; ts_trn_nb updated: %" GST_TIME_FORMAT, GST_TIME_ARGS (h264parse->ts_trn_nb)); break; } break; case GST_H264_NAL_SLICE: case GST_H264_NAL_SLICE_DPA: case GST_H264_NAL_SLICE_DPB: case GST_H264_NAL_SLICE_DPC: case GST_H264_NAL_SLICE_IDR: /* don't need to parse the whole slice (header) here */ if (*(nalu->data + nalu->offset + 1) & 0x80) { /* means first_mb_in_slice == 0 */ /* real frame data */ GST_DEBUG_OBJECT (h264parse, "first_mb_in_slice = 0"); h264parse->frame_start = TRUE; } GST_DEBUG_OBJECT (h264parse, "frame start: %i", h264parse->frame_start); #ifndef GST_DISABLE_GST_DEBUG { GstH264SliceHdr slice; GstH264ParserResult pres; pres = gst_h264_parser_parse_slice_hdr (nalparser, nalu, &slice, FALSE, FALSE); GST_DEBUG_OBJECT (h264parse, "parse result %d, first MB: %u, slice type: %u", pres, slice.first_mb_in_slice, slice.type); } #endif if (G_LIKELY (nal_type != GST_H264_NAL_SLICE_IDR && !h264parse->push_codec)) break; /* if we need to sneak codec NALs into the stream, * this is a good place, so fake it as IDR * (which should be at start anyway) */ /* mark where config needs to go if interval expired */ /* mind replacement buffer if applicable */ if (h264parse->idr_pos == -1) { if (h264parse->format == GST_H264_PARSE_FORMAT_AVC) h264parse->idr_pos = gst_adapter_available (h264parse->frame_out); else h264parse->idr_pos = nalu->offset - 4; GST_DEBUG_OBJECT (h264parse, "marking IDR in frame at offset %d", h264parse->idr_pos); } break; default: gst_h264_parser_parse_nal (nalparser, nalu); } /* if AVC output needed, collect properly prefixed nal in adapter, * and use that to replace outgoing buffer data later on */ if (h264parse->format == GST_H264_PARSE_FORMAT_AVC) { GstBuffer *buf; GST_LOG_OBJECT (h264parse, "collecting NAL in AVC frame"); buf = gst_h264_parse_wrap_nal (h264parse, h264parse->format, nalu->data + nalu->offset, nalu->size); gst_adapter_push (h264parse->frame_out, buf); } } /* caller guarantees at least 2 bytes of nal payload for each nal * returns TRUE if next_nal indicates that nal terminates an AU */ static inline gboolean gst_h264_parse_collect_nal (GstH264Parse * h264parse, const guint8 * data, guint size, GstH264NalUnit * nalu) { gboolean complete; GstH264ParserResult parse_res; GstH264NalUnitType nal_type = nalu->type; GstH264NalUnit nnalu; if (h264parse->align == GST_H264_PARSE_ALIGN_NAL) { return TRUE; } GST_DEBUG_OBJECT (h264parse, "parsing collected nal"); parse_res = gst_h264_parser_identify_nalu (h264parse->nalparser, data, nalu->offset + nalu->size, size, &nnalu); if (parse_res == GST_H264_PARSER_ERROR) return FALSE; /* determine if AU complete */ GST_LOG_OBJECT (h264parse, "nal type: %d", nal_type); /* coded slice NAL starts a picture, * i.e. other types become aggregated in front of it */ h264parse->picture_start |= (nal_type == GST_H264_NAL_SLICE || nal_type == GST_H264_NAL_SLICE_DPA || nal_type == GST_H264_NAL_SLICE_IDR); /* consider a coded slices (IDR or not) to start a picture, * (so ending the previous one) if first_mb_in_slice == 0 * (non-0 is part of previous one) */ /* NOTE this is not entirely according to Access Unit specs in 7.4.1.2.4, * but in practice it works in sane cases, needs not much parsing, * and also works with broken frame_num in NAL * (where spec-wise would fail) */ nal_type = nnalu.type; complete = h264parse->picture_start && (nal_type >= GST_H264_NAL_SEI && nal_type <= GST_H264_NAL_AU_DELIMITER); GST_LOG_OBJECT (h264parse, "next nal type: %d", nal_type); complete |= h264parse->picture_start && (nal_type == GST_H264_NAL_SLICE || nal_type == GST_H264_NAL_SLICE_DPA || nal_type == GST_H264_NAL_SLICE_IDR) && /* first_mb_in_slice == 0 considered start of frame */ (nnalu.data[nnalu.offset + 1] & 0x80); GST_LOG_OBJECT (h264parse, "au complete: %d", complete); return complete; } /* FIXME move into baseparse, or anything equivalent; * see https://bugzilla.gnome.org/show_bug.cgi?id=650093 */ #define GST_BASE_PARSE_FRAME_FLAG_PARSING 0x10000 static gboolean gst_h264_parse_check_valid_frame (GstBaseParse * parse, GstBaseParseFrame * frame, guint * framesize, gint * skipsize) { GstH264Parse *h264parse = GST_H264_PARSE (parse); GstBuffer *buffer = frame->buffer; guint8 *data; gsize size; guint current_off = 0; gboolean drain; GstH264NalParser *nalparser = h264parse->nalparser; GstH264NalUnit nalu; data = gst_buffer_map (buffer, &size, NULL, GST_MAP_READ); /* expect at least 3 bytes startcode == sc, and 2 bytes NALU payload */ if (G_UNLIKELY (size < 5)) { gst_buffer_unmap (buffer, data, size); return FALSE; } /* need to configure aggregation */ if (G_UNLIKELY (h264parse->format == GST_H264_PARSE_FORMAT_NONE)) gst_h264_parse_negotiate (h264parse, NULL); /* avoid stale cached parsing state */ if (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_PARSING)) { GST_LOG_OBJECT (h264parse, "parsing new frame"); gst_h264_parse_reset_frame (h264parse); frame->flags |= GST_BASE_PARSE_FRAME_FLAG_PARSING; } else { GST_LOG_OBJECT (h264parse, "resuming frame parsing"); } drain = FALSE; nalu = h264parse->nalu; current_off = h264parse->current_off; GST_DEBUG_OBJECT (h264parse, "last parse position %u", current_off); while (TRUE) { GstH264ParserResult pres; if (h264parse->packetized) pres = gst_h264_parser_identify_nalu_unchecked (nalparser, data, current_off, size, &nalu); else pres = gst_h264_parser_identify_nalu (nalparser, data, current_off, size, &nalu); switch (pres) { case GST_H264_PARSER_OK: GST_DEBUG_OBJECT (h264parse, "complete nal found. " "current offset: %u, Nal offset: %u, Nal Size: %u", current_off, nalu.offset, nalu.size); GST_DEBUG_OBJECT (h264parse, "current off. %u", nalu.offset + nalu.size); if (!h264parse->nalu.size && !h264parse->nalu.valid) h264parse->nalu = nalu; /* need 2 bytes of next nal */ if (!h264parse->packetized && (nalu.offset + nalu.size + 4 + 2 > size)) { if (GST_BASE_PARSE_DRAINING (parse)) { drain = TRUE; } else { GST_DEBUG_OBJECT (h264parse, "need more bytes of next nal"); current_off = nalu.sc_offset; goto more; } } break; case GST_H264_PARSER_BROKEN_LINK: goto out; case GST_H264_PARSER_ERROR: current_off = size - 3; goto parsing_error; case GST_H264_PARSER_NO_NAL: /* don't expect to have found any NAL so far */ g_assert (h264parse->nalu.size == 0); current_off = h264parse->nalu.sc_offset = size - 3; goto more; case GST_H264_PARSER_BROKEN_DATA: GST_WARNING_OBJECT (h264parse, "input stream is corrupt; " "it contains a NAL unit of length %d", nalu.size); /* broken nal at start -> arrange to skip it, * otherwise have it terminate current au * (and so it will be skipped on next frame round) */ if (nalu.sc_offset == h264parse->nalu.sc_offset) { *skipsize = nalu.offset; GST_DEBUG_OBJECT (h264parse, "skipping broken nal"); goto invalid; } else { nalu.size = 0; goto end; } case GST_H264_PARSER_NO_NAL_END: GST_DEBUG_OBJECT (h264parse, "not a complete nal found at offset %u", nalu.offset); current_off = nalu.sc_offset; /* We keep the reference to this nal so we start over the parsing * here */ if (!h264parse->nalu.size && !h264parse->nalu.valid) h264parse->nalu = nalu; if (GST_BASE_PARSE_DRAINING (parse)) { drain = TRUE; GST_DEBUG_OBJECT (h264parse, "draining NAL %" G_GSIZE_FORMAT " %u %u", size, h264parse->nalu.offset, h264parse->nalu.size); /* Can't parse the nalu */ if (size - h264parse->nalu.offset < 2) { *skipsize = nalu.offset; goto invalid; } /* We parse it anyway */ nalu.size = size - nalu.offset; break; } goto more; } current_off = nalu.offset + nalu.size; GST_DEBUG_OBJECT (h264parse, "%p complete nal found. Off: %u, Size: %u", data, nalu.offset, nalu.size); gst_h264_parse_process_nal (h264parse, &nalu); /* if no next nal, we know it's complete here */ if (drain || gst_h264_parse_collect_nal (h264parse, data, size, &nalu)) break; /* In packetized mode we know there's only on NALU in each input packet */ if (h264parse->packetized) break; GST_DEBUG_OBJECT (h264parse, "Looking for more"); } end: *skipsize = h264parse->nalu.sc_offset; *framesize = nalu.offset + nalu.size - h264parse->nalu.sc_offset; h264parse->current_off = current_off; gst_buffer_unmap (buffer, data, size); return TRUE; parsing_error: GST_DEBUG_OBJECT (h264parse, "error parsing Nal Unit"); more: /* ask for best next available */ *framesize = G_MAXUINT; if (!h264parse->nalu.size) { /* skip up to initial startcode */ *skipsize = h264parse->nalu.sc_offset; /* but mind some stuff will have been skipped */ g_assert (current_off >= *skipsize); current_off -= *skipsize; h264parse->nalu.sc_offset = 0; } else { *skipsize = 0; } /* Restart parsing from here next time */ h264parse->current_off = current_off; /* Fall-through. */ out: gst_buffer_unmap (buffer, data, size); return FALSE; invalid: gst_h264_parse_reset_frame (h264parse); goto out; } /* byte together avc codec data based on collected pps and sps so far */ static GstBuffer * gst_h264_parse_make_codec_data (GstH264Parse * h264parse) { GstBuffer *buf, *nal; gint i, sps_size = 0, pps_size = 0, num_sps = 0, num_pps = 0; guint8 profile_idc = 0, profile_comp = 0, level_idc = 0; gboolean found = FALSE; guint8 *buf_data, *data; /* only nal payload in stored nals */ for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) { if ((nal = h264parse->sps_nals[i])) { gsize size = gst_buffer_get_size (nal); num_sps++; /* size bytes also count */ sps_size += size + 2; if (size >= 4) { guint8 tmp[3]; found = TRUE; gst_buffer_extract (nal, 1, tmp, 3); profile_idc = tmp[0]; profile_comp = tmp[1]; level_idc = tmp[2]; } } } for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) { if ((nal = h264parse->pps_nals[i])) { num_pps++; /* size bytes also count */ pps_size += gst_buffer_get_size (nal) + 2; } } GST_DEBUG_OBJECT (h264parse, "constructing codec_data: num_sps=%d, num_pps=%d", num_sps, num_pps); if (!found || !num_pps) return NULL; buf = gst_buffer_new_allocate (NULL, 5 + 1 + sps_size + 1 + pps_size, 0); buf_data = gst_buffer_map (buf, NULL, NULL, GST_MAP_WRITE); data = buf_data; data[0] = 1; /* AVC Decoder Configuration Record ver. 1 */ data[1] = profile_idc; /* profile_idc */ data[2] = profile_comp; /* profile_compability */ data[3] = level_idc; /* level_idc */ data[4] = 0xfc | (4 - 1); /* nal_length_size_minus1 */ data[5] = 0xe0 | num_sps; /* number of SPSs */ data += 6; for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) { if ((nal = h264parse->sps_nals[i])) { gsize nal_size = gst_buffer_get_size (nal); GST_WRITE_UINT16_BE (data, nal_size); gst_buffer_extract (nal, 0, data + 2, nal_size); data += 2 + nal_size; } } data[0] = num_pps; data++; for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) { if ((nal = h264parse->pps_nals[i])) { gsize nal_size = gst_buffer_get_size (nal); GST_WRITE_UINT16_BE (data, nal_size); gst_buffer_extract (nal, 0, data + 2, nal_size); data += 2 + nal_size; } } gst_buffer_unmap (buf, buf_data, -1); return buf; } static void gst_h264_parse_get_par (GstH264Parse * h264parse, gint * num, gint * den) { gint par_n, par_d; if (h264parse->upstream_par_n != -1 && h264parse->upstream_par_d != -1) { *num = h264parse->upstream_par_n; *den = h264parse->upstream_par_d; return; } par_n = par_d = 0; switch (h264parse->aspect_ratio_idc) { case 0: par_n = par_d = 0; break; case 1: par_n = 1; par_d = 1; break; case 2: par_n = 12; par_d = 11; break; case 3: par_n = 10; par_d = 11; break; case 4: par_n = 16; par_d = 11; break; case 5: par_n = 40; par_d = 33; break; case 6: par_n = 24; par_d = 11; break; case 7: par_n = 20; par_d = 11; break; case 8: par_n = 32; par_d = 11; break; case 9: par_n = 80; par_d = 33; break; case 10: par_n = 18; par_d = 11; break; case 11: par_n = 15; par_d = 11; break; case 12: par_n = 64; par_d = 33; break; case 13: par_n = 160; par_d = 99; break; case 14: par_n = 4; par_d = 3; break; case 15: par_n = 3; par_d = 2; break; case 16: par_n = 2; par_d = 1; break; case 255: par_n = h264parse->sar_width; par_d = h264parse->sar_height; break; default: par_n = par_d = 0; } *num = par_n; *den = par_d; } static void gst_h264_parse_update_src_caps (GstH264Parse * h264parse, GstCaps * caps) { GstH264SPS *sps; GstCaps *sink_caps; gboolean modified = FALSE; GstBuffer *buf = NULL; if (G_UNLIKELY (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (h264parse)))) modified = TRUE; else if (G_UNLIKELY (!h264parse->update_caps)) return; /* if this is being called from the first _setcaps call, caps on the sinkpad * aren't set yet and so they need to be passed as an argument */ if (caps) sink_caps = caps; else sink_caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (h264parse)); /* carry over input caps as much as possible; override with our own stuff */ if (!sink_caps) sink_caps = gst_caps_new_empty_simple ("video/x-h264"); sps = h264parse->nalparser->last_sps; GST_DEBUG_OBJECT (h264parse, "sps: %p", sps); /* only codec-data for nice-and-clean au aligned packetized avc format */ if (h264parse->format == GST_H264_PARSE_FORMAT_AVC && h264parse->align == GST_H264_PARSE_ALIGN_AU) { buf = gst_h264_parse_make_codec_data (h264parse); if (buf && h264parse->codec_data) { gsize size; gpointer data; data = gst_buffer_map (buf, &size, NULL, GST_MAP_READ); if (size != gst_buffer_get_size (h264parse->codec_data) || gst_buffer_memcmp (h264parse->codec_data, 0, data, size)) modified = TRUE; gst_buffer_unmap (buf, data, size); } else { if (h264parse->codec_data) buf = gst_buffer_ref (h264parse->codec_data); modified = TRUE; } } caps = NULL; if (G_UNLIKELY (!sps)) { caps = gst_caps_copy (sink_caps); } else { if (G_UNLIKELY (h264parse->width != sps->width || h264parse->height != sps->height)) { GST_INFO_OBJECT (h264parse, "resolution changed %dx%d", sps->width, sps->height); h264parse->width = sps->width; h264parse->height = sps->height; modified = TRUE; } /* 0/1 is set as the default in the codec parser */ if (sps->vui_parameters.timing_info_present_flag && !(sps->fps_num == 0 && sps->fps_den == 1)) { if (G_UNLIKELY (h264parse->fps_num != sps->fps_num || h264parse->fps_den != sps->fps_den)) { GST_INFO_OBJECT (h264parse, "framerate changed %d/%d", sps->fps_num, sps->fps_den); h264parse->fps_num = sps->fps_num; h264parse->fps_den = sps->fps_den; gst_base_parse_set_frame_rate (GST_BASE_PARSE (h264parse), h264parse->fps_num, h264parse->fps_den, 0, 0); modified = TRUE; } } if (sps->vui_parameters.aspect_ratio_info_present_flag) { if (G_UNLIKELY (h264parse->aspect_ratio_idc != sps->vui_parameters.aspect_ratio_idc)) { h264parse->aspect_ratio_idc = sps->vui_parameters.aspect_ratio_idc; GST_INFO_OBJECT (h264parse, "aspect ratio idc changed %d", h264parse->aspect_ratio_idc); modified = TRUE; } /* 255 means sar_width and sar_height present */ if (G_UNLIKELY (sps->vui_parameters.aspect_ratio_idc == 255 && (h264parse->sar_width != sps->vui_parameters.sar_width || h264parse->sar_height != sps->vui_parameters.sar_height))) { h264parse->sar_width = sps->vui_parameters.sar_width; h264parse->sar_height = sps->vui_parameters.sar_height; GST_INFO_OBJECT (h264parse, "aspect ratio SAR changed %d/%d", h264parse->sar_width, h264parse->sar_height); modified = TRUE; } } if (G_UNLIKELY (modified)) { caps = gst_caps_copy (sink_caps); /* sps should give this */ gst_caps_set_simple (caps, "width", G_TYPE_INT, sps->width, "height", G_TYPE_INT, sps->height, NULL); /* but not necessarily or reliably this */ if (h264parse->fps_num > 0 && h264parse->fps_den > 0) gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, h264parse->fps_num, h264parse->fps_den, NULL); } } if (caps) { gint par_n, par_d; gst_caps_set_simple (caps, "parsed", G_TYPE_BOOLEAN, TRUE, "stream-format", G_TYPE_STRING, gst_h264_parse_get_string (h264parse, TRUE, h264parse->format), "alignment", G_TYPE_STRING, gst_h264_parse_get_string (h264parse, FALSE, h264parse->align), NULL); gst_h264_parse_get_par (h264parse, &par_n, &par_d); if (par_n != 0 && par_d != 0) { GST_INFO_OBJECT (h264parse, "PAR %d/%d", par_n, par_d); gst_caps_set_simple (caps, "pixel-aspect-ratio", GST_TYPE_FRACTION, par_n, par_d, NULL); } if (buf) { gst_caps_set_simple (caps, "codec_data", GST_TYPE_BUFFER, buf, NULL); gst_buffer_replace (&h264parse->codec_data, buf); gst_buffer_unref (buf); buf = NULL; } else { GstStructure *s; /* remove any left-over codec-data hanging around */ s = gst_caps_get_structure (caps, 0); gst_structure_remove_field (s, "codec_data"); } gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (h264parse), caps); gst_caps_unref (caps); } gst_caps_unref (sink_caps); if (buf) gst_buffer_unref (buf); } static void gst_h264_parse_get_timestamp (GstH264Parse * h264parse, GstClockTime * out_ts, GstClockTime * out_dur, gboolean frame) { GstH264SPS *sps = h264parse->nalparser->last_sps; GstClockTime upstream; gint duration = 1; g_return_if_fail (out_dur != NULL); g_return_if_fail (out_ts != NULL); upstream = *out_ts; if (!frame) { GST_LOG_OBJECT (h264parse, "no frame data -> 0 duration"); *out_dur = 0; goto exit; } else { *out_ts = upstream; } if (!sps) { GST_DEBUG_OBJECT (h264parse, "referred SPS invalid"); goto exit; } else if (!sps->vui_parameters.timing_info_present_flag) { GST_DEBUG_OBJECT (h264parse, "unable to compute timestamp: timing info not present"); goto exit; } else if (sps->vui_parameters.time_scale == 0) { GST_DEBUG_OBJECT (h264parse, "unable to compute timestamp: time_scale = 0 " "(this is forbidden in spec; bitstream probably contains error)"); goto exit; } if (h264parse->sei_pic_struct_pres_flag && h264parse->sei_pic_struct != (guint8) - 1) { /* Note that when h264parse->sei_pic_struct == -1 (unspecified), there * are ways to infer its value. This is related to computing the * TopFieldOrderCnt and BottomFieldOrderCnt, which looks * complicated and thus not implemented for the time being. Yet * the value we have here is correct for many applications */ switch (h264parse->sei_pic_struct) { case GST_H264_SEI_PIC_STRUCT_TOP_FIELD: case GST_H264_SEI_PIC_STRUCT_BOTTOM_FIELD: duration = 1; break; case GST_H264_SEI_PIC_STRUCT_FRAME: case GST_H264_SEI_PIC_STRUCT_TOP_BOTTOM: case GST_H264_SEI_PIC_STRUCT_BOTTOM_TOP: duration = 2; break; case GST_H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP: case GST_H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM: duration = 3; break; case GST_H264_SEI_PIC_STRUCT_FRAME_DOUBLING: duration = 4; break; case GST_H264_SEI_PIC_STRUCT_FRAME_TRIPLING: duration = 6; break; default: GST_DEBUG_OBJECT (h264parse, "h264parse->sei_pic_struct of unknown value %d. Not parsed", h264parse->sei_pic_struct); break; } } else { duration = h264parse->field_pic_flag ? 1 : 2; } GST_LOG_OBJECT (h264parse, "frame tick duration %d", duration); /* * h264parse.264 C.1.2 Timing of coded picture removal (equivalent to DTS): * Tr,n(0) = initial_cpb_removal_delay[ SchedSelIdx ] / 90000 * Tr,n(n) = Tr,n(nb) + Tc * cpb_removal_delay(n) * where * Tc = num_units_in_tick / time_scale */ if (h264parse->ts_trn_nb != GST_CLOCK_TIME_NONE) { GST_LOG_OBJECT (h264parse, "buffering based ts"); /* buffering period is present */ if (upstream != GST_CLOCK_TIME_NONE) { /* If upstream timestamp is valid, we respect it and adjust current * reference point */ h264parse->ts_trn_nb = upstream - (GstClockTime) gst_util_uint64_scale_int (h264parse->sei_cpb_removal_delay * GST_SECOND, sps->vui_parameters.num_units_in_tick, sps->vui_parameters.time_scale); } else { /* If no upstream timestamp is given, we write in new timestamp */ upstream = h264parse->dts = h264parse->ts_trn_nb + (GstClockTime) gst_util_uint64_scale_int (h264parse->sei_cpb_removal_delay * GST_SECOND, sps->vui_parameters.num_units_in_tick, sps->vui_parameters.time_scale); } } else { GstClockTime dur; GST_LOG_OBJECT (h264parse, "duration based ts"); /* naive method: no removal delay specified * track upstream timestamp and provide best guess frame duration */ dur = gst_util_uint64_scale_int (duration * GST_SECOND, sps->vui_parameters.num_units_in_tick, sps->vui_parameters.time_scale); /* sanity check */ if (dur < GST_MSECOND) { GST_DEBUG_OBJECT (h264parse, "discarding dur %" GST_TIME_FORMAT, GST_TIME_ARGS (dur)); } else { *out_dur = dur; } } exit: if (GST_CLOCK_TIME_IS_VALID (upstream)) *out_ts = h264parse->dts = upstream; if (GST_CLOCK_TIME_IS_VALID (*out_dur) && GST_CLOCK_TIME_IS_VALID (h264parse->dts)) h264parse->dts += *out_dur; } static GstFlowReturn gst_h264_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame) { GstH264Parse *h264parse; GstBuffer *buffer; guint av; h264parse = GST_H264_PARSE (parse); buffer = frame->buffer; gst_h264_parse_update_src_caps (h264parse, NULL); /* don't mess with timestamps if provided by upstream, * particularly since our ts not that good they handle seeking etc */ if (h264parse->do_ts) gst_h264_parse_get_timestamp (h264parse, &GST_BUFFER_TIMESTAMP (buffer), &GST_BUFFER_DURATION (buffer), h264parse->frame_start); if (h264parse->keyframe) GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT); else GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT); /* replace with transformed AVC output if applicable */ av = gst_adapter_available (h264parse->frame_out); if (av) { GstBuffer *buf; buf = gst_adapter_take_buffer (h264parse->frame_out, av); gst_buffer_copy_into (buf, buffer, GST_BUFFER_COPY_METADATA, 0, -1); gst_buffer_replace (&frame->buffer, buf); gst_buffer_unref (buf); } return GST_FLOW_OK; } /* sends a codec NAL downstream, decorating and transforming as needed. * No ownership is taken of @nal */ static GstFlowReturn gst_h264_parse_push_codec_buffer (GstH264Parse * h264parse, GstBuffer * nal, GstClockTime ts) { gpointer data; gsize size; data = gst_buffer_map (nal, &size, NULL, GST_MAP_READ); nal = gst_h264_parse_wrap_nal (h264parse, h264parse->format, data, size); gst_buffer_unmap (nal, data, size); GST_BUFFER_TIMESTAMP (nal) = ts; GST_BUFFER_DURATION (nal) = 0; return gst_pad_push (GST_BASE_PARSE_SRC_PAD (h264parse), nal); } static GstEvent * check_pending_key_unit_event (GstEvent * pending_event, GstSegment * segment, GstClockTime timestamp, guint flags, GstClockTime pending_key_unit_ts) { GstClockTime running_time, stream_time; gboolean all_headers; guint count; GstEvent *event = NULL; g_return_val_if_fail (segment != NULL, NULL); if (pending_event == NULL) goto out; if (GST_CLOCK_TIME_IS_VALID (pending_key_unit_ts) && timestamp == GST_CLOCK_TIME_NONE) goto out; running_time = gst_segment_to_running_time (segment, GST_FORMAT_TIME, timestamp); GST_INFO ("now %" GST_TIME_FORMAT " wanted %" GST_TIME_FORMAT, GST_TIME_ARGS (running_time), GST_TIME_ARGS (pending_key_unit_ts)); if (GST_CLOCK_TIME_IS_VALID (pending_key_unit_ts) && running_time < pending_key_unit_ts) goto out; if (flags & GST_BUFFER_FLAG_DELTA_UNIT) { GST_DEBUG ("pending force key unit, waiting for keyframe"); goto out; } stream_time = gst_segment_to_stream_time (segment, GST_FORMAT_TIME, timestamp); gst_video_event_parse_upstream_force_key_unit (pending_event, NULL, &all_headers, &count); event = gst_video_event_new_downstream_force_key_unit (timestamp, stream_time, running_time, all_headers, count); gst_event_set_seqnum (event, gst_event_get_seqnum (pending_event)); out: return event; } static void gst_h264_parse_prepare_key_unit (GstH264Parse * parse, GstEvent * event) { GstClockTime running_time; guint count; gboolean have_sps, have_pps; gint i; parse->pending_key_unit_ts = GST_CLOCK_TIME_NONE; gst_event_replace (&parse->force_key_unit_event, NULL); gst_video_event_parse_downstream_force_key_unit (event, NULL, NULL, &running_time, NULL, &count); GST_INFO_OBJECT (parse, "pushing downstream force-key-unit event %d " "%" GST_TIME_FORMAT " count %d", gst_event_get_seqnum (event), GST_TIME_ARGS (running_time), count); gst_pad_push_event (GST_BASE_PARSE_SRC_PAD (parse), event); have_sps = have_pps = FALSE; for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) { if (parse->sps_nals[i] != NULL) { have_sps = TRUE; break; } } for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) { if (parse->pps_nals[i] != NULL) { have_pps = TRUE; break; } } GST_INFO_OBJECT (parse, "preparing key unit, have sps %d have pps %d", have_sps, have_pps); /* set push_codec to TRUE so that pre_push_frame sends SPS/PPS again */ parse->push_codec = TRUE; } static GstFlowReturn gst_h264_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame) { GstH264Parse *h264parse; GstBuffer *buffer; GstEvent *event; h264parse = GST_H264_PARSE (parse); buffer = frame->buffer; if ((event = check_pending_key_unit_event (h264parse->force_key_unit_event, &parse->segment, GST_BUFFER_TIMESTAMP (buffer), GST_BUFFER_FLAGS (buffer), h264parse->pending_key_unit_ts))) { gst_h264_parse_prepare_key_unit (h264parse, event); } /* periodic SPS/PPS sending */ if (h264parse->interval > 0 || h264parse->push_codec) { GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer); guint64 diff; /* init */ if (!GST_CLOCK_TIME_IS_VALID (h264parse->last_report)) { h264parse->last_report = timestamp; } if (h264parse->idr_pos >= 0) { GST_LOG_OBJECT (h264parse, "IDR nal at offset %d", h264parse->idr_pos); if (timestamp > h264parse->last_report) diff = timestamp - h264parse->last_report; else diff = 0; GST_LOG_OBJECT (h264parse, "now %" GST_TIME_FORMAT ", last SPS/PPS %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp), GST_TIME_ARGS (h264parse->last_report)); GST_DEBUG_OBJECT (h264parse, "interval since last SPS/PPS %" GST_TIME_FORMAT, GST_TIME_ARGS (diff)); if (GST_TIME_AS_SECONDS (diff) >= h264parse->interval || h264parse->push_codec) { GstBuffer *codec_nal; gint i; GstClockTime new_ts; /* avoid overwriting a perfectly fine timestamp */ new_ts = GST_CLOCK_TIME_IS_VALID (timestamp) ? timestamp : h264parse->last_report; if (h264parse->align == GST_H264_PARSE_ALIGN_NAL) { /* send separate config NAL buffers */ GST_DEBUG_OBJECT (h264parse, "- sending SPS/PPS"); for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) { if ((codec_nal = h264parse->sps_nals[i])) { GST_DEBUG_OBJECT (h264parse, "sending SPS nal"); gst_h264_parse_push_codec_buffer (h264parse, codec_nal, timestamp); h264parse->last_report = new_ts; } } for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) { if ((codec_nal = h264parse->pps_nals[i])) { GST_DEBUG_OBJECT (h264parse, "sending PPS nal"); gst_h264_parse_push_codec_buffer (h264parse, codec_nal, timestamp); h264parse->last_report = new_ts; } } } else { /* insert config NALs into AU */ GstByteWriter bw; GstBuffer *new_buf; const gboolean bs = h264parse->format == GST_H264_PARSE_FORMAT_BYTE; gst_byte_writer_init_with_size (&bw, gst_buffer_get_size (buffer), FALSE); gst_byte_writer_put_buffer (&bw, buffer, 0, h264parse->idr_pos); GST_DEBUG_OBJECT (h264parse, "- inserting SPS/PPS"); for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) { if ((codec_nal = h264parse->sps_nals[i])) { gsize nal_size = gst_buffer_get_size (codec_nal); GST_DEBUG_OBJECT (h264parse, "inserting SPS nal"); gst_byte_writer_put_uint32_be (&bw, bs ? 1 : nal_size); gst_byte_writer_put_buffer (&bw, codec_nal, 0, nal_size); h264parse->last_report = new_ts; } } for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) { if ((codec_nal = h264parse->pps_nals[i])) { gsize nal_size = gst_buffer_get_size (codec_nal); GST_DEBUG_OBJECT (h264parse, "inserting PPS nal"); gst_byte_writer_put_uint32_be (&bw, bs ? 1 : nal_size); gst_byte_writer_put_buffer (&bw, codec_nal, 0, nal_size); h264parse->last_report = new_ts; } } gst_byte_writer_put_buffer (&bw, buffer, h264parse->idr_pos, -1); /* collect result and push */ new_buf = gst_byte_writer_reset_and_get_buffer (&bw); gst_buffer_copy_into (new_buf, buffer, GST_BUFFER_COPY_METADATA, 0, -1); /* should already be keyframe/IDR, but it may not have been, * so mark it as such to avoid being discarded by picky decoder */ GST_BUFFER_FLAG_UNSET (new_buf, GST_BUFFER_FLAG_DELTA_UNIT); gst_buffer_replace (&frame->buffer, new_buf); gst_buffer_unref (new_buf); } } /* we pushed whatever we had */ h264parse->push_codec = FALSE; h264parse->have_sps = FALSE; h264parse->have_pps = FALSE; } } gst_h264_parse_reset_frame (h264parse); return GST_FLOW_OK; } static gboolean gst_h264_parse_set_caps (GstBaseParse * parse, GstCaps * caps) { GstH264Parse *h264parse; GstStructure *str; const GValue *value; GstBuffer *codec_data = NULL; gsize size; guint format, align, off; GstH264NalUnit nalu; GstH264ParserResult parseres; h264parse = GST_H264_PARSE (parse); /* reset */ h264parse->push_codec = FALSE; str = gst_caps_get_structure (caps, 0); /* accept upstream info if provided */ gst_structure_get_int (str, "width", &h264parse->width); gst_structure_get_int (str, "height", &h264parse->height); gst_structure_get_fraction (str, "framerate", &h264parse->fps_num, &h264parse->fps_den); gst_structure_get_fraction (str, "pixel-aspect-ratio", &h264parse->upstream_par_n, &h264parse->upstream_par_d); /* get upstream format and align from caps */ gst_h264_parse_format_from_caps (caps, &format, &align); /* packetized video has a codec_data */ if (format != GST_H264_PARSE_FORMAT_BYTE && (value = gst_structure_get_value (str, "codec_data"))) { guint8 *data; guint num_sps, num_pps, profile; gint i; GST_DEBUG_OBJECT (h264parse, "have packetized h264"); /* make note for optional split processing */ h264parse->packetized = TRUE; codec_data = gst_value_get_buffer (value); if (!codec_data) goto wrong_type; data = gst_buffer_map (codec_data, &size, NULL, GST_MAP_READ); /* parse the avcC data */ if (size < 8) { gst_buffer_unmap (codec_data, data, size); goto avcc_too_small; } /* parse the version, this must be 1 */ if (data[0] != 1) { gst_buffer_unmap (codec_data, data, size); goto wrong_version; } /* AVCProfileIndication */ /* profile_compat */ /* AVCLevelIndication */ profile = (data[1] << 16) | (data[2] << 8) | data[3]; GST_DEBUG_OBJECT (h264parse, "profile %06x", profile); /* 6 bits reserved | 2 bits lengthSizeMinusOne */ /* this is the number of bytes in front of the NAL units to mark their * length */ h264parse->nal_length_size = (data[4] & 0x03) + 1; GST_DEBUG_OBJECT (h264parse, "nal length size %u", h264parse->nal_length_size); num_sps = data[5] & 0x1f; off = 6; for (i = 0; i < num_sps; i++) { parseres = gst_h264_parser_identify_nalu_avc (h264parse->nalparser, data, off, size, 2, &nalu); if (parseres != GST_H264_PARSER_OK) { gst_buffer_unmap (codec_data, data, size); goto avcc_too_small; } gst_h264_parse_process_nal (h264parse, &nalu); off = nalu.offset + nalu.size; } num_pps = data[off]; off++; for (i = 0; i < num_pps; i++) { parseres = gst_h264_parser_identify_nalu_avc (h264parse->nalparser, data, off, size, 2, &nalu); if (parseres != GST_H264_PARSER_OK) { gst_buffer_unmap (codec_data, data, size); goto avcc_too_small; } gst_h264_parse_process_nal (h264parse, &nalu); off = nalu.offset + nalu.size; } gst_buffer_unmap (codec_data, data, size); h264parse->codec_data = gst_buffer_ref (codec_data); /* if upstream sets codec_data without setting stream-format and alignment, we * assume stream-format=avc,alignment=au */ if (format == GST_H264_PARSE_FORMAT_NONE) { format = GST_H264_PARSE_FORMAT_AVC; align = GST_H264_PARSE_ALIGN_AU; } } else { GST_DEBUG_OBJECT (h264parse, "have bytestream h264"); /* nothing to pre-process */ h264parse->packetized = FALSE; /* we have 4 sync bytes */ h264parse->nal_length_size = 4; if (format == GST_H264_PARSE_FORMAT_NONE) { format = GST_H264_PARSE_FORMAT_BYTE; align = GST_H264_PARSE_ALIGN_AU; } } { GstCaps *in_caps; /* prefer input type determined above */ in_caps = gst_caps_new_simple ("video/x-h264", "parsed", G_TYPE_BOOLEAN, TRUE, "stream-format", G_TYPE_STRING, gst_h264_parse_get_string (h264parse, TRUE, format), "alignment", G_TYPE_STRING, gst_h264_parse_get_string (h264parse, FALSE, align), NULL); /* negotiate with downstream, sets ->format and ->align */ gst_h264_parse_negotiate (h264parse, in_caps); gst_caps_unref (in_caps); } if (format == h264parse->format && align == h264parse->align) { gst_base_parse_set_passthrough (parse, TRUE); /* we did parse codec-data and might supplement src caps */ gst_h264_parse_update_src_caps (h264parse, caps); } else if (format == GST_H264_PARSE_FORMAT_AVC) { /* if input != output, and input is avc, must split before anything else */ /* arrange to insert codec-data in-stream if needed. * src caps are only arranged for later on */ h264parse->push_codec = TRUE; h264parse->have_sps = FALSE; h264parse->have_pps = FALSE; h264parse->split_packetized = TRUE; h264parse->packetized = TRUE; } return TRUE; /* ERRORS */ avcc_too_small: { GST_DEBUG_OBJECT (h264parse, "avcC size %" G_GSIZE_FORMAT " < 8", size); goto refuse_caps; } wrong_version: { GST_DEBUG_OBJECT (h264parse, "wrong avcC version"); goto refuse_caps; } wrong_type: { GST_DEBUG_OBJECT (h264parse, "wrong codec-data type"); goto refuse_caps; } refuse_caps: { GST_WARNING_OBJECT (h264parse, "refused caps %" GST_PTR_FORMAT, caps); return FALSE; } } static GstCaps * gst_h264_parse_get_caps (GstBaseParse * parse, GstCaps * filter) { GstCaps *peercaps, *template_caps; GstCaps *res; template_caps = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD (parse)); peercaps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (parse)); if (peercaps) { guint i, n; peercaps = gst_caps_make_writable (peercaps); n = gst_caps_get_size (peercaps); for (i = 0; i < n; i++) { GstStructure *s = gst_caps_get_structure (peercaps, i); gst_structure_remove_field (s, "alignment"); gst_structure_remove_field (s, "stream-format"); gst_structure_remove_field (s, "parsed"); } res = gst_caps_intersect_full (peercaps, template_caps, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (peercaps); gst_caps_unref (template_caps); } else { res = template_caps; } if (filter) { GstCaps *tmp = gst_caps_intersect_full (res, filter, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (res); res = tmp; } return res; } static gboolean gst_h264_parse_event (GstBaseParse * parse, GstEvent * event) { gboolean handled = FALSE; GstH264Parse *h264parse = GST_H264_PARSE (parse); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CUSTOM_DOWNSTREAM: { GstClockTime timestamp, stream_time, running_time; gboolean all_headers; guint count; if (!gst_video_event_is_force_key_unit (event)) break; gst_video_event_parse_downstream_force_key_unit (event, ×tamp, &stream_time, &running_time, &all_headers, &count); GST_INFO_OBJECT (h264parse, "received downstream force key unit event, " "seqnum %d running_time %" GST_TIME_FORMAT " all_headers %d count %d", gst_event_get_seqnum (event), GST_TIME_ARGS (running_time), all_headers, count); handled = TRUE; if (h264parse->force_key_unit_event) { GST_INFO_OBJECT (h264parse, "ignoring force key unit event " "as one is already queued"); break; } h264parse->pending_key_unit_ts = running_time; gst_event_replace (&h264parse->force_key_unit_event, event); break; } case GST_EVENT_FLUSH_STOP: h264parse->dts = GST_CLOCK_TIME_NONE; h264parse->ts_trn_nb = GST_CLOCK_TIME_NONE; break; case GST_EVENT_SEGMENT: { const GstSegment *segment; gst_event_parse_segment (event, &segment); /* don't try to mess with more subtle cases (e.g. seek) */ if (segment->format == GST_FORMAT_TIME && (segment->start != 0 || segment->rate != 1.0 || segment->applied_rate != 1.0)) h264parse->do_ts = FALSE; break; } default: break; } return handled; } static gboolean gst_h264_parse_src_event (GstBaseParse * parse, GstEvent * event) { gboolean handled = FALSE; GstH264Parse *h264parse = GST_H264_PARSE (parse); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CUSTOM_UPSTREAM: { GstClockTime running_time; gboolean all_headers; guint count; if (!gst_video_event_is_force_key_unit (event)) break; gst_video_event_parse_upstream_force_key_unit (event, &running_time, &all_headers, &count); GST_INFO_OBJECT (h264parse, "received upstream force-key-unit event, " "seqnum %d running_time %" GST_TIME_FORMAT " all_headers %d count %d", gst_event_get_seqnum (event), GST_TIME_ARGS (running_time), all_headers, count); if (!all_headers) break; h264parse->pending_key_unit_ts = running_time; gst_event_replace (&h264parse->force_key_unit_event, event); /* leave handled = FALSE so that the event gets propagated upstream */ break; } default: break; } return handled; } static GstFlowReturn gst_h264_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstH264Parse *h264parse = GST_H264_PARSE (parent); if (h264parse->packetized && buffer) { GstBuffer *sub; GstFlowReturn ret = GST_FLOW_OK; GstH264ParserResult parse_res; GstH264NalUnit nalu; const guint nl = h264parse->nal_length_size; gpointer data; gsize size; if (nl < 1 || nl > 4) { GST_DEBUG_OBJECT (h264parse, "insufficient data to split input"); gst_buffer_unref (buffer); return GST_FLOW_NOT_NEGOTIATED; } data = gst_buffer_map (buffer, &size, NULL, GST_MAP_READ); GST_LOG_OBJECT (h264parse, "processing packet buffer of size %" G_GSIZE_FORMAT, size); parse_res = gst_h264_parser_identify_nalu_avc (h264parse->nalparser, data, 0, size, nl, &nalu); while (parse_res == GST_H264_PARSER_OK) { GST_DEBUG_OBJECT (h264parse, "AVC nal offset %d", nalu.offset + nalu.size); if (h264parse->split_packetized) { /* convert to NAL aligned byte stream input */ sub = gst_h264_parse_wrap_nal (h264parse, GST_H264_PARSE_FORMAT_BYTE, nalu.data + nalu.offset, nalu.size); /* at least this should make sense */ GST_BUFFER_TIMESTAMP (sub) = GST_BUFFER_TIMESTAMP (buffer); GST_LOG_OBJECT (h264parse, "pushing NAL of size %d", nalu.size); ret = h264parse->parse_chain (pad, parent, sub); } else { /* pass-through: no looking for frames (and nal processing), * so need to parse to collect data here */ /* NOTE: so if it is really configured to do so, * pre_push can/will still insert codec-data at intervals, * which is not really pure pass-through, but anyway ... */ gst_h264_parse_process_nal (h264parse, &nalu); } parse_res = gst_h264_parser_identify_nalu_avc (h264parse->nalparser, data, nalu.offset + nalu.size, size, nl, &nalu); } gst_buffer_unmap (buffer, data, size); if (h264parse->split_packetized) { gst_buffer_unref (buffer); return ret; } else { /* nal processing in pass-through might have collected stuff; * ensure nothing happens with this later on */ gst_adapter_clear (h264parse->frame_out); } if (parse_res == GST_H264_PARSER_NO_NAL_END || parse_res == GST_H264_PARSER_BROKEN_DATA) { if (h264parse->split_packetized) { GST_ELEMENT_ERROR (h264parse, STREAM, FAILED, (NULL), ("invalid AVC input data")); gst_buffer_unref (buffer); return GST_FLOW_ERROR; } else { /* do not meddle to much in this case */ GST_DEBUG_OBJECT (h264parse, "parsing packet failed"); } } } return h264parse->parse_chain (pad, parent, buffer); } static void gst_h264_parse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstH264Parse *parse; parse = GST_H264_PARSE (object); switch (prop_id) { case PROP_CONFIG_INTERVAL: parse->interval = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_h264_parse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstH264Parse *parse; parse = GST_H264_PARSE (object); switch (prop_id) { case PROP_CONFIG_INTERVAL: g_value_set_uint (value, parse->interval); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }