/* GStreamer H.264 Parser * Copyright (C) <2010> Mark Nauwelaerts * Copyright (C) <2010> Collabora Multimedia * Copyright (C) <2010> Nokia Corporation * * 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 "gsth264parse.h" #include GST_DEBUG_CATEGORY (h264_parse_debug); #define GST_CAT_DEFAULT h264_parse_debug #define DEFAULT_SPLIT_PACKETIZED FALSE #define DEFAULT_CONFIG_INTERVAL (0) enum { PROP_0, PROP_SPLIT_PACKETIZED, 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, parsed = (boolean) false")); static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-h264, parsed = (boolean) true")); GST_BOILERPLATE (GstH264Parse, gst_h264_parse, GstElement, 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 GstFlowReturn gst_h264_parse_chain (GstPad * pad, GstBuffer * buffer); static void gst_h264_parse_base_init (gpointer g_class) { GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class); 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/Video", "Parses H.264 streams", "Mark Nauwelaerts "); GST_DEBUG_CATEGORY_INIT (h264_parse_debug, "h264parse", 0, "h264 parser"); } static void gst_h264_parse_class_init (GstH264ParseClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass); 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_SPLIT_PACKETIZED, g_param_spec_boolean ("split-packetized", "Split packetized", "Split NAL units of packetized streams", DEFAULT_SPLIT_PACKETIZED, G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS)); 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); } static void gst_h264_parse_init (GstH264Parse * h264parse, GstH264ParseClass * g_class) { 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); } static void gst_h264_parse_reset_frame (GstH264Parse * h264parse) { /* done parsing; reset state */ h264parse->last_nal_pos = 0; h264parse->next_sc_pos = 0; h264parse->picture_start = FALSE; h264parse->update_caps = FALSE; h264parse->idr_pos = -1; h264parse->keyframe = FALSE; h264parse->frame_start = FALSE; } static void gst_h264_parse_reset (GstH264Parse * h264parse) { h264parse->width = 0; h264parse->height = 0; h264parse->fps_num = 0; h264parse->fps_den = 0; 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; gst_h264_parse_reset_frame (h264parse); } static gboolean gst_h264_parse_start (GstBaseParse * parse) { GstH264Parse *h264parse = GST_H264_PARSE (parse); GST_DEBUG ("Start"); gst_h264_parse_reset (h264parse); gst_h264_params_create (&h264parse->params, GST_ELEMENT (h264parse)); gst_base_parse_set_min_frame_size (parse, 512); return TRUE; } static gboolean gst_h264_parse_stop (GstBaseParse * parse) { GstH264Parse *h264parse = GST_H264_PARSE (parse); GST_DEBUG ("Stop"); gst_h264_parse_reset (h264parse); gst_h264_params_free (h264parse->params); h264parse->params = NULL; 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"; } } } /* check downstream caps to configure format and alignment */ static void gst_h264_parse_negotiate (GstH264Parse * h264parse) { 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 (caps && gst_caps_get_size (caps) > 0) { GstStructure *s = gst_caps_get_structure (caps, 0); const gchar *str = NULL; 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; } else { GST_DEBUG_OBJECT (h264parse, "unknown stream-format: %s", str); } } 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; } else { GST_DEBUG_OBJECT (h264parse, "unknown alignment: %s", str); } } } if (caps) 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; const guint nl = h264parse->nal_length_size; buf = gst_buffer_new_and_alloc (size + nl + 4); if (format == GST_H264_PARSE_FORMAT_AVC) { GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf), size << (32 - 8 * nl)); } else { g_assert (nl == 4); GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf), 1); } GST_BUFFER_SIZE (buf) = size + nl; memcpy (GST_BUFFER_DATA (buf) + nl, data, size); return 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, guint8 * data, gint sc_pos, gint nal_pos, guint nal_size) { guint nal_type; g_return_if_fail (nal_size >= 2); g_return_if_fail (nal_pos - sc_pos > 0 && nal_pos - sc_pos <= 4); /* lower layer collects params */ gst_h264_params_parse_nal (h264parse->params, data + nal_pos, nal_size); /* we have a peek as well */ nal_type = data[nal_pos] & 0x1f; h264parse->keyframe |= NAL_TYPE_IS_KEY (nal_type); switch (nal_type) { case NAL_SPS: case NAL_PPS: /* parameters might have changed, force caps check */ GST_DEBUG_OBJECT (h264parse, "triggering src caps check"); h264parse->update_caps = TRUE; /* found in stream, no need to forcibly push at start */ h264parse->push_codec = FALSE; break; case NAL_SLICE: case NAL_SLICE_DPA: case NAL_SLICE_DPB: case NAL_SLICE_DPC: /* real frame data */ h264parse->frame_start |= (h264parse->params->first_mb_in_slice == 0); /* 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) */ if (G_LIKELY (!h264parse->push_codec)) break; /* fall-through */ case NAL_SLICE_IDR: /* real frame data */ h264parse->frame_start |= (h264parse->params->first_mb_in_slice == 0); /* mark where config needs to go if interval expired */ /* mind replacement buffer if applicable */ if (h264parse->format == GST_H264_PARSE_FORMAT_AVC) h264parse->idr_pos = gst_adapter_available (h264parse->frame_out); else h264parse->idr_pos = sc_pos; GST_DEBUG_OBJECT (h264parse, "marking IDR in frame at offset %d", h264parse->idr_pos); break; } /* 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, data + nal_pos, nal_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, guint8 * nal, guint8 * next_nal) { gint nal_type; gboolean complete; if (h264parse->align == GST_H264_PARSE_ALIGN_NAL) return TRUE; /* determine if AU complete */ nal_type = nal[0] & 0x1f; 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 == 1 || nal_type == 2 || nal_type == 5); /* 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 = next_nal[0] & 0x1f; GST_LOG_OBJECT (h264parse, "next nal type: %d", nal_type); complete = h264parse->picture_start && (nal_type >= 6 && nal_type <= 9); complete |= h264parse->picture_start && (nal_type == 1 || nal_type == 2 || nal_type == 5) && /* first_mb_in_slice == 0 considered start of frame */ (next_nal[1] & 0x80); GST_LOG_OBJECT (h264parse, "au complete: %d", complete); return complete; } /* finds next startcode == 00 00 01, along with a subsequent byte */ static guint gst_h264_parse_find_sc (GstBuffer * buffer, guint skip) { GstByteReader br; guint sc_pos = -1; gst_byte_reader_init_from_buffer (&br, buffer); /* NALU not empty, so we can at least expect 1 (even 2) bytes following sc */ sc_pos = gst_byte_reader_masked_scan_uint32 (&br, 0xffffff00, 0x00000100, skip, gst_byte_reader_get_remaining (&br) - skip); return sc_pos; } 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; gint sc_pos, nal_pos, next_sc_pos, next_nal_pos; guint8 *data; guint size; gboolean drain; /* expect at least 3 bytes startcode == sc, and 2 bytes NALU payload */ if (G_UNLIKELY (GST_BUFFER_SIZE (buffer) < 5)) return FALSE; /* need to configure aggregation */ if (G_UNLIKELY (h264parse->format == GST_H264_PARSE_FORMAT_NONE)) gst_h264_parse_negotiate (h264parse); data = GST_BUFFER_DATA (buffer); size = GST_BUFFER_SIZE (buffer); GST_LOG_OBJECT (h264parse, "last_nal_pos: %d, last_scan_pos %d", h264parse->last_nal_pos, h264parse->next_sc_pos); nal_pos = h264parse->last_nal_pos; next_sc_pos = h264parse->next_sc_pos; if (!next_sc_pos) { sc_pos = gst_h264_parse_find_sc (buffer, 0); if (sc_pos == -1) { /* SC not found, need more data */ sc_pos = GST_BUFFER_SIZE (buffer) - 3; goto more; } nal_pos = sc_pos + 3; next_sc_pos = nal_pos; /* sc might have 2 or 3 0-bytes */ if (sc_pos > 0 && data[sc_pos - 1] == 00) sc_pos--; GST_LOG_OBJECT (h264parse, "found sc at offset %d", sc_pos); } else { /* previous checks already arrange sc at start */ sc_pos = 0; } drain = GST_BASE_PARSE_FRAME_DRAIN (frame); while (TRUE) { gint prev_sc_pos; next_sc_pos = gst_h264_parse_find_sc (buffer, next_sc_pos); if (next_sc_pos == -1) { GST_LOG_OBJECT (h264parse, "no next sc"); if (drain) { /* FLUSH/EOS, it's okay if we can't find the next frame */ next_sc_pos = size; next_nal_pos = size; } else { next_sc_pos = size - 3; goto more; } } else { next_nal_pos = next_sc_pos + 3; if (data[next_sc_pos - 1] == 00) next_sc_pos--; GST_LOG_OBJECT (h264parse, "found next sc at offset %d", next_sc_pos); /* need at least 1 more byte of next NAL */ if (!drain && (next_nal_pos == size - 1)) goto more; } /* determine nal's sc position */ prev_sc_pos = nal_pos - 3; g_assert (prev_sc_pos >= 0); if (prev_sc_pos > 0 && data[prev_sc_pos - 1] == 0) prev_sc_pos--; /* already consume and gather info from NAL */ gst_h264_parse_process_nal (h264parse, data, prev_sc_pos, nal_pos, next_sc_pos - nal_pos); if (next_nal_pos >= size - 1 || gst_h264_parse_collect_nal (h264parse, data + nal_pos, data + next_nal_pos)) break; /* move along */ next_sc_pos = nal_pos = next_nal_pos; } *skipsize = sc_pos; *framesize = next_sc_pos - sc_pos; return TRUE; more: /* Ask for 1024 bytes more - this is an arbitrary choice */ gst_base_parse_set_min_frame_size (parse, GST_BUFFER_SIZE (buffer) + 1024); /* skip up to initial startcode */ *skipsize = sc_pos; /* resume scanning here next time */ h264parse->last_nal_pos = nal_pos; h264parse->next_sc_pos = next_sc_pos; return FALSE; } /* 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 *data; /* only nal payload in stored nals */ for (i = 0; i < MAX_SPS_COUNT; i++) { if ((nal = h264parse->params->sps_nals[i])) { num_sps++; /* size bytes also count */ sps_size += GST_BUFFER_SIZE (nal) + 2; if (GST_BUFFER_SIZE (nal) >= 4) { found = TRUE; profile_idc = (GST_BUFFER_DATA (nal))[1]; profile_comp = (GST_BUFFER_DATA (nal))[2]; level_idc = (GST_BUFFER_DATA (nal))[3]; } } } for (i = 0; i < MAX_PPS_COUNT; i++) { if ((nal = h264parse->params->pps_nals[i])) { num_pps++; /* size bytes also count */ pps_size += GST_BUFFER_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_and_alloc (5 + 1 + sps_size + 1 + pps_size); data = GST_BUFFER_DATA (buf); 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 < MAX_SPS_COUNT; i++) { if ((nal = h264parse->params->sps_nals[i])) { GST_WRITE_UINT16_BE (data, GST_BUFFER_SIZE (nal)); memcpy (data + 2, GST_BUFFER_DATA (nal), GST_BUFFER_SIZE (nal)); data += 2 + GST_BUFFER_SIZE (nal); } } data[0] = num_pps; data++; for (i = 0; i < MAX_PPS_COUNT; i++) { if ((nal = h264parse->params->pps_nals[i])) { GST_WRITE_UINT16_BE (data, GST_BUFFER_SIZE (nal)); memcpy (data + 2, GST_BUFFER_DATA (nal), GST_BUFFER_SIZE (nal)); data += 2 + GST_BUFFER_SIZE (nal); } } return buf; } static void gst_h264_parse_update_src_caps (GstH264Parse * h264parse) { GstH264ParamsSPS *sps; GstCaps *caps = NULL, *sink_caps; gboolean modified = FALSE; GstBuffer *buf = NULL; if (G_UNLIKELY (!GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (h264parse)))) modified = TRUE; else if (G_UNLIKELY (!h264parse->update_caps)) return; /* carry over input caps as much as possible; override with our own stuff */ sink_caps = GST_PAD_CAPS (GST_BASE_PARSE_SINK_PAD (h264parse)); if (sink_caps) gst_caps_ref (sink_caps); else sink_caps = gst_caps_new_simple ("video/x-h264", NULL); sps = h264parse->params->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) { if (GST_BUFFER_SIZE (buf) != GST_BUFFER_SIZE (h264parse->codec_data) || memcmp (GST_BUFFER_DATA (buf), GST_BUFFER_DATA (h264parse->codec_data), GST_BUFFER_SIZE (buf))) modified = TRUE; } else { if (h264parse->codec_data) buf = gst_buffer_ref (h264parse->codec_data); modified = TRUE; } } if (G_UNLIKELY (!sps)) { caps = gst_caps_copy (sink_caps); } else if (G_UNLIKELY (h264parse->width != sps->width || h264parse->height != sps->height || h264parse->fps_num != sps->fps_num || h264parse->fps_den != sps->fps_den || 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); h264parse->height = sps->height; h264parse->width = sps->width; /* but not necessarily or reliably this */ if ((!h264parse->fps_num || !h264parse->fps_den) && sps->fps_num > 0 && sps->fps_den > 0) { gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, sps->fps_num, sps->fps_den, NULL); h264parse->fps_num = sps->fps_num; h264parse->fps_den = sps->fps_den; gst_base_parse_set_frame_props (GST_BASE_PARSE (h264parse), h264parse->fps_num, h264parse->fps_den, 0, 0); } } if (caps) { gst_caps_set_simple (caps, "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); 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 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); gst_h264_params_get_timestamp (h264parse->params, &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_metadata (buf, buffer, GST_BUFFER_COPY_ALL); gst_buffer_replace (&frame->buffer, 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) { nal = gst_h264_parse_wrap_nal (h264parse, h264parse->format, GST_BUFFER_DATA (nal), GST_BUFFER_SIZE (nal)); GST_BUFFER_TIMESTAMP (nal) = ts; GST_BUFFER_DURATION (nal) = 0; gst_buffer_set_caps (nal, GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (h264parse))); return gst_pad_push (GST_BASE_PARSE_SRC_PAD (h264parse), nal); } static GstFlowReturn gst_h264_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame) { GstH264Parse *h264parse; GstBuffer *buffer; h264parse = GST_H264_PARSE (parse); buffer = frame->buffer; /* 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 < MAX_SPS_COUNT; i++) { if ((codec_nal = h264parse->params->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 < MAX_PPS_COUNT; i++) { if ((codec_nal = h264parse->params->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_SIZE (buffer), FALSE); gst_byte_writer_put_data (&bw, GST_BUFFER_DATA (buffer), h264parse->idr_pos); GST_DEBUG_OBJECT (h264parse, "- inserting SPS/PPS"); for (i = 0; i < MAX_SPS_COUNT; i++) { if ((codec_nal = h264parse->params->sps_nals[i])) { GST_DEBUG_OBJECT (h264parse, "inserting SPS nal"); gst_byte_writer_put_uint32_be (&bw, bs ? 1 : GST_BUFFER_SIZE (codec_nal)); gst_byte_writer_put_data (&bw, GST_BUFFER_DATA (codec_nal), GST_BUFFER_SIZE (codec_nal)); h264parse->last_report = new_ts; } } for (i = 0; i < MAX_PPS_COUNT; i++) { if ((codec_nal = h264parse->params->pps_nals[i])) { GST_DEBUG_OBJECT (h264parse, "inserting PPS nal"); gst_byte_writer_put_uint32_be (&bw, bs ? 1 : GST_BUFFER_SIZE (codec_nal)); gst_byte_writer_put_data (&bw, GST_BUFFER_DATA (codec_nal), GST_BUFFER_SIZE (codec_nal)); h264parse->last_report = new_ts; } } gst_byte_writer_put_data (&bw, GST_BUFFER_DATA (buffer) + h264parse->idr_pos, GST_BUFFER_SIZE (buffer) - h264parse->idr_pos); /* collect result and push */ new_buf = gst_byte_writer_reset_and_get_buffer (&bw); gst_buffer_copy_metadata (new_buf, buffer, GST_BUFFER_COPY_ALL); gst_buffer_replace (&frame->buffer, new_buf); } } /* we pushed whatever we had */ h264parse->push_codec = 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 *buffer = NULL; guint size; 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); /* packetized video has a codec_data */ if ((value = gst_structure_get_value (str, "codec_data"))) { guint8 *data; guint num_sps, num_pps, profile, len; gint i; GST_DEBUG_OBJECT (h264parse, "have packetized h264"); /* make note for optional split processing */ h264parse->packetized = TRUE; buffer = gst_value_get_buffer (value); if (!buffer) goto wrong_type; data = GST_BUFFER_DATA (buffer); size = GST_BUFFER_SIZE (buffer); /* parse the avcC data */ if (size < 7) goto avcc_too_small; /* parse the version, this must be 1 */ if (data[0] != 1) 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 %u", h264parse->nal_length_size); num_sps = data[5] & 0x1f; data += 6; size -= 6; for (i = 0; i < num_sps; i++) { len = GST_READ_UINT16_BE (data); if (size < len + 2 || len < 2) goto avcc_too_small; /* digest for later reference */ gst_h264_parse_process_nal (h264parse, data, 0, 2, len); data += len + 2; size -= len + 2; } num_pps = data[0]; data++; size++; for (i = 0; i < num_pps; i++) { len = GST_READ_UINT16_BE (data); if (size < len + 2 || len < 2) goto avcc_too_small; /* digest for later reference */ gst_h264_parse_process_nal (h264parse, data, 0, 2, len); data += len + 2; size -= len + 2; } } 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 (h264parse->packetized) { if (h264parse->split_packetized) { GST_DEBUG_OBJECT (h264parse, "converting AVC to nal bytestream prior to parsing"); /* negotiate behaviour with upstream */ gst_h264_parse_negotiate (h264parse); if (h264parse->format == GST_H264_PARSE_FORMAT_BYTE) { /* arrange to insert codec-data in-stream if needed */ h264parse->push_codec = h264parse->packetized; } } else { GST_DEBUG_OBJECT (h264parse, "passing on packetized AVC"); /* no choice to negotiate */ h264parse->format = GST_H264_PARSE_FORMAT_AVC; h264parse->align = GST_H264_PARSE_ALIGN_AU; /* fallback codec-data */ h264parse->codec_data = gst_buffer_ref (buffer); /* pass through unharmed, though _chain will parse a bit */ gst_base_parse_set_format (parse, GST_BASE_PARSE_FORMAT_PASSTHROUGH, TRUE); /* we did parse codec-data and might supplement src caps */ gst_h264_parse_update_src_caps (h264parse); } } /* src caps are only arranged for later on */ return TRUE; /* ERRORS */ avcc_too_small: { GST_DEBUG_OBJECT (h264parse, "avcC size %u < 7", 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 GstFlowReturn gst_h264_parse_chain (GstPad * pad, GstBuffer * buffer) { GstH264Parse *h264parse = GST_H264_PARSE (GST_PAD_PARENT (pad)); if (h264parse->packetized && buffer) { GstByteReader br; GstBuffer *sub; GstFlowReturn ret = GST_FLOW_OK; guint32 len; const guint nl = h264parse->nal_length_size; GST_LOG_OBJECT (h264parse, "processing packet buffer of size %d", GST_BUFFER_SIZE (buffer)); gst_byte_reader_init_from_buffer (&br, buffer); while (ret == GST_FLOW_OK && gst_byte_reader_get_remaining (&br)) { GST_DEBUG_OBJECT (h264parse, "AVC nal offset %d", gst_byte_reader_get_pos (&br)); if (gst_byte_reader_get_remaining (&br) < nl) goto parse_failed; switch (nl) { case 4: len = gst_byte_reader_get_uint32_be_unchecked (&br); break; case 3: len = gst_byte_reader_get_uint24_be_unchecked (&br); break; case 2: len = gst_byte_reader_get_uint16_be_unchecked (&br); break; case 1: len = gst_byte_reader_get_uint8_unchecked (&br); break; default: goto not_negotiated; break; } GST_DEBUG_OBJECT (h264parse, "AVC nal size %d", len); if (gst_byte_reader_get_remaining (&br) < len) goto parse_failed; if (h264parse->split_packetized) { /* convert to NAL aligned byte stream input */ sub = gst_h264_parse_wrap_nal (h264parse, GST_H264_PARSE_FORMAT_BYTE, (guint8 *) gst_byte_reader_get_data_unchecked (&br, len), len); /* at least this should make sense */ GST_BUFFER_TIMESTAMP (sub) = GST_BUFFER_TIMESTAMP (buffer); GST_LOG_OBJECT (h264parse, "pushing NAL of size %d", len); ret = h264parse->parse_chain (pad, 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, GST_BUFFER_DATA (buffer), gst_byte_reader_get_pos (&br) - nl, gst_byte_reader_get_pos (&br), len); gst_byte_reader_skip_unchecked (&br, len); } } if (h264parse->split_packetized) return ret; } exit: /* nal processing in pass-through might have collected stuff; * ensure nothing happens with this later on */ gst_adapter_clear (h264parse->frame_out); return h264parse->parse_chain (pad, buffer); /* ERRORS */ not_negotiated: { GST_DEBUG_OBJECT (h264parse, "insufficient data to split input"); return GST_FLOW_NOT_NEGOTIATED; } parse_failed: { if (h264parse->split_packetized) { GST_ELEMENT_ERROR (h264parse, STREAM, FAILED, (NULL), ("invalid AVC input data")); return GST_FLOW_ERROR; } else { /* do not meddle to much in this case */ GST_DEBUG_OBJECT (h264parse, "parsing packet failed"); goto exit; } } } 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_SPLIT_PACKETIZED: parse->split_packetized = g_value_get_boolean (value); break; 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_SPLIT_PACKETIZED: g_value_set_boolean (value, parse->split_packetized); break; case PROP_CONFIG_INTERVAL: g_value_set_uint (value, parse->interval); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }