/* GStreamer * * Copyright (c) 2008,2009 Sebastian Dröge * Copyright (c) 2008-2017 Collabora Ltd * @author: Sebastian Dröge * @author: Vincent Penquerc'h * * 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. */ /** * SECTION:element-flvmux * @title: flvmux * * flvmux muxes different streams into an FLV file. * * ## Example launch line * |[ * gst-launch-1.0 -v flvmux name=mux ! filesink location=test.flv audiotestsrc samplesperbuffer=44100 num-buffers=10 ! faac ! mux. videotestsrc num-buffers=250 ! video/x-raw,framerate=25/1 ! x264enc ! mux. * ]| This pipeline encodes a test audio and video stream and muxes both into an FLV file. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "gstflvelements.h" #include "gstflvmux.h" #include "amfdefs.h" GST_DEBUG_CATEGORY_STATIC (flvmux_debug); #define GST_CAT_DEFAULT flvmux_debug enum { PROP_0, PROP_STREAMABLE, PROP_METADATACREATOR, PROP_ENCODER, PROP_SKIP_BACKWARDS_STREAMS, }; #define DEFAULT_STREAMABLE FALSE #define MAX_INDEX_ENTRIES 128 #define DEFAULT_METADATACREATOR "GStreamer " PACKAGE_VERSION " FLV muxer" #define DEFAULT_SKIP_BACKWARDS_STREAMS FALSE static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-flv") ); static GstStaticPadTemplate videosink_templ = GST_STATIC_PAD_TEMPLATE ("video", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS ("video/x-flash-video; " "video/x-flash-screen; " "video/x-vp6-flash; " "video/x-vp6-alpha; " "video/x-h264, stream-format=avc;") ); static GstStaticPadTemplate audiosink_templ = GST_STATIC_PAD_TEMPLATE ("audio", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS ("audio/x-adpcm, layout = (string) swf, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; " "audio/mpeg, mpegversion = (int) 1, layer = (int) 3, channels = (int) { 1, 2 }, rate = (int) { 5512, 8000, 11025, 22050, 44100 }, parsed = (boolean) TRUE; " "audio/mpeg, mpegversion = (int) { 4, 2 }, stream-format = (string) raw; " "audio/x-nellymoser, channels = (int) { 1, 2 }, rate = (int) { 5512, 8000, 11025, 16000, 22050, 44100 }; " "audio/x-raw, format = (string) { U8, S16LE}, layout = (string) interleaved, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; " "audio/x-alaw, channels = (int) { 1, 2 }, rate = (int) 8000; " "audio/x-mulaw, channels = (int) { 1, 2 }, rate = (int) 8000; " "audio/x-speex, channels = (int) 1, rate = (int) 16000;") ); G_DEFINE_TYPE (GstFlvMuxPad, gst_flv_mux_pad, GST_TYPE_AGGREGATOR_PAD); #define gst_flv_mux_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstFlvMux, gst_flv_mux, GST_TYPE_AGGREGATOR, G_IMPLEMENT_INTERFACE (GST_TYPE_TAG_SETTER, NULL)); GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (flvmux, "flvmux", GST_RANK_PRIMARY, GST_TYPE_FLV_MUX, flv_element_init (plugin)); static GstFlowReturn gst_flv_mux_aggregate (GstAggregator * aggregator, gboolean timeout); static gboolean gst_flv_mux_sink_event (GstAggregator * aggregator, GstAggregatorPad * pad, GstEvent * event); static GstAggregatorPad *gst_flv_mux_create_new_pad (GstAggregator * agg, GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps); static void gst_flv_mux_release_pad (GstElement * element, GstPad * pad); static gboolean gst_flv_mux_video_pad_setcaps (GstFlvMuxPad * pad, GstCaps * caps); static gboolean gst_flv_mux_audio_pad_setcaps (GstFlvMuxPad * pad, GstCaps * caps); static void gst_flv_mux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_flv_mux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_flv_mux_finalize (GObject * object); static void gst_flv_mux_reset (GstElement * element); static void gst_flv_mux_reset_pad (GstFlvMuxPad * pad); static void gst_flv_mux_pad_finalize (GObject * object); static gboolean gst_flv_mux_start (GstAggregator * aggregator); static GstFlowReturn gst_flv_mux_flush (GstAggregator * aggregator); static GstClockTime gst_flv_mux_get_next_time (GstAggregator * aggregator); static GstFlowReturn gst_flv_mux_write_eos (GstFlvMux * mux); static GstFlowReturn gst_flv_mux_write_header (GstFlvMux * mux); static GstFlowReturn gst_flv_mux_rewrite_header (GstFlvMux * mux); static gboolean gst_flv_mux_are_all_pads_eos (GstFlvMux * mux); static GstClockTime gst_flv_mux_query_upstream_duration (GstFlvMux * mux); static GstClockTime gst_flv_mux_segment_to_running_time (const GstSegment * segment, GstClockTime t); static GstFlowReturn gst_flv_mux_pad_flush (GstAggregatorPad * pad, GstAggregator * aggregator) { GstFlvMuxPad *flvpad = GST_FLV_MUX_PAD (pad); flvpad->last_timestamp = GST_CLOCK_TIME_NONE; flvpad->pts = GST_CLOCK_TIME_NONE; flvpad->dts = GST_CLOCK_TIME_NONE; return GST_FLOW_OK; } static gboolean gst_flv_mux_skip_buffer (GstAggregatorPad * apad, GstAggregator * aggregator, GstBuffer * buffer) { GstFlvMuxPad *fpad = GST_FLV_MUX_PAD_CAST (apad); GstFlvMux *mux = GST_FLV_MUX_CAST (aggregator); GstClockTime t; if (!mux->skip_backwards_streams) return FALSE; if (fpad->drop_deltas) { if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT)) { GST_INFO_OBJECT (fpad, "Waiting for keyframe, dropping %" GST_PTR_FORMAT, buffer); return TRUE; } else { /* drop-deltas is set and the buffer isn't delta, drop flag */ fpad->drop_deltas = FALSE; } } if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS_OR_PTS (buffer))) { t = gst_flv_mux_segment_to_running_time (&apad->segment, GST_BUFFER_DTS_OR_PTS (buffer)); if (t < (GST_MSECOND * mux->last_dts)) { GST_WARNING_OBJECT (fpad, "Timestamp %" GST_TIME_FORMAT " going backwards from last used %" GST_TIME_FORMAT ", dropping %" GST_PTR_FORMAT, GST_TIME_ARGS (t), GST_TIME_ARGS (GST_MSECOND * mux->last_dts), buffer); /* Look for non-delta buffer */ fpad->drop_deltas = TRUE; return TRUE; } } return FALSE; } static void gst_flv_mux_pad_class_init (GstFlvMuxPadClass * klass) { GstAggregatorPadClass *aggregatorpad_class = (GstAggregatorPadClass *) klass; GObjectClass *gobject_class = (GObjectClass *) klass; gobject_class->finalize = gst_flv_mux_pad_finalize; aggregatorpad_class->flush = GST_DEBUG_FUNCPTR (gst_flv_mux_pad_flush); aggregatorpad_class->skip_buffer = GST_DEBUG_FUNCPTR (gst_flv_mux_skip_buffer); } static void gst_flv_mux_pad_init (GstFlvMuxPad * pad) { gst_flv_mux_reset_pad (pad); } typedef struct { gdouble position; gdouble time; } GstFlvMuxIndexEntry; static void gst_flv_mux_index_entry_free (GstFlvMuxIndexEntry * entry) { g_slice_free (GstFlvMuxIndexEntry, entry); } static GstBuffer * _gst_buffer_new_wrapped (gpointer mem, gsize size, GFreeFunc free_func) { GstBuffer *buf; buf = gst_buffer_new (); gst_buffer_append_memory (buf, gst_memory_new_wrapped (free_func ? 0 : GST_MEMORY_FLAG_READONLY, mem, size, 0, size, mem, free_func)); return buf; } static void _gst_buffer_new_and_alloc (gsize size, GstBuffer ** buffer, guint8 ** data) { g_return_if_fail (data != NULL); g_return_if_fail (buffer != NULL); *data = g_malloc (size); *buffer = _gst_buffer_new_wrapped (*data, size, g_free); } static void gst_flv_mux_class_init (GstFlvMuxClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstAggregatorClass *gstaggregator_class; GST_DEBUG_CATEGORY_INIT (flvmux_debug, "flvmux", 0, "FLV muxer"); gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstaggregator_class = (GstAggregatorClass *) klass; gobject_class->get_property = gst_flv_mux_get_property; gobject_class->set_property = gst_flv_mux_set_property; gobject_class->finalize = gst_flv_mux_finalize; /* FIXME: ideally the right mode of operation should be detected * automatically using queries when parameter not specified. */ /** * GstFlvMux:streamable * * If True, the output will be streaming friendly. (ie without indexes and * duration) */ g_object_class_install_property (gobject_class, PROP_STREAMABLE, g_param_spec_boolean ("streamable", "streamable", "If set to true, the output should be as if it is to be streamed " "and hence no indexes written or duration written.", DEFAULT_STREAMABLE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_METADATACREATOR, g_param_spec_string ("metadatacreator", "metadatacreator", "The value of metadatacreator in the meta packet.", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ENCODER, g_param_spec_string ("encoder", "encoder", "The value of encoder in the meta packet.", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_SKIP_BACKWARDS_STREAMS, g_param_spec_boolean ("skip-backwards-streams", "Skip backwards streams", "If set to true, streams that go backwards related to the other stream " "will have buffers dropped until they reach the correct timestamp", DEFAULT_SKIP_BACKWARDS_STREAMS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstaggregator_class->create_new_pad = GST_DEBUG_FUNCPTR (gst_flv_mux_create_new_pad); gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_flv_mux_release_pad); gstaggregator_class->start = GST_DEBUG_FUNCPTR (gst_flv_mux_start); gstaggregator_class->aggregate = GST_DEBUG_FUNCPTR (gst_flv_mux_aggregate); gstaggregator_class->sink_event = GST_DEBUG_FUNCPTR (gst_flv_mux_sink_event); gstaggregator_class->flush = GST_DEBUG_FUNCPTR (gst_flv_mux_flush); gstaggregator_class->get_next_time = GST_DEBUG_FUNCPTR (gst_flv_mux_get_next_time); gstaggregator_class->negotiate = NULL; gst_element_class_add_static_pad_template_with_gtype (gstelement_class, &videosink_templ, GST_TYPE_FLV_MUX_PAD); gst_element_class_add_static_pad_template_with_gtype (gstelement_class, &audiosink_templ, GST_TYPE_FLV_MUX_PAD); gst_element_class_add_static_pad_template_with_gtype (gstelement_class, &src_templ, GST_TYPE_AGGREGATOR_PAD); gst_element_class_set_static_metadata (gstelement_class, "FLV muxer", "Codec/Muxer", "Muxes video/audio streams into a FLV stream", "Sebastian Dröge "); GST_DEBUG_CATEGORY_INIT (flvmux_debug, "flvmux", 0, "FLV muxer"); gst_type_mark_as_plugin_api (GST_TYPE_FLV_MUX_PAD, 0); } static void gst_flv_mux_init (GstFlvMux * mux) { mux->srcpad = GST_AGGREGATOR_CAST (mux)->srcpad; /* property */ mux->streamable = DEFAULT_STREAMABLE; mux->metadatacreator = g_strdup (DEFAULT_METADATACREATOR); mux->encoder = g_strdup (DEFAULT_METADATACREATOR); mux->new_tags = FALSE; gst_flv_mux_reset (GST_ELEMENT (mux)); } static void gst_flv_mux_finalize (GObject * object) { GstFlvMux *mux = GST_FLV_MUX (object); gst_flv_mux_reset (GST_ELEMENT (object)); g_free (mux->metadatacreator); g_free (mux->encoder); G_OBJECT_CLASS (gst_flv_mux_parent_class)->finalize (object); } static void gst_flv_mux_pad_finalize (GObject * object) { GstFlvMuxPad *pad = GST_FLV_MUX_PAD (object); gst_flv_mux_reset_pad (pad); G_OBJECT_CLASS (gst_flv_mux_pad_parent_class)->finalize (object); } static GstFlowReturn gst_flv_mux_flush (GstAggregator * aggregator) { /* TODO: What is the right behaviour on flush? Should we just ignore it ? * This still needs to be defined. */ gst_flv_mux_reset (GST_ELEMENT (aggregator)); return GST_FLOW_OK; } static gboolean gst_flv_mux_start (GstAggregator * aggregator) { gst_flv_mux_reset (GST_ELEMENT (aggregator)); return TRUE; } static void gst_flv_mux_reset (GstElement * element) { GstFlvMux *mux = GST_FLV_MUX (element); g_list_foreach (mux->index, (GFunc) gst_flv_mux_index_entry_free, NULL); g_list_free (mux->index); mux->index = NULL; mux->byte_count = 0; mux->duration = GST_CLOCK_TIME_NONE; mux->new_tags = FALSE; mux->first_timestamp = GST_CLOCK_TIME_NONE; mux->last_dts = 0; mux->state = GST_FLV_MUX_STATE_HEADER; mux->sent_header = FALSE; /* tags */ gst_tag_setter_reset_tags (GST_TAG_SETTER (mux)); } /* Extract per-codec relevant tags for * insertion into the metadata later - ie bitrate, * but maybe others in the future */ static void gst_flv_mux_store_codec_tags (GstFlvMux * mux, GstFlvMuxPad * flvpad, GstTagList * list) { /* Look for a bitrate as either nominal or actual bitrate tag */ if (gst_tag_list_get_uint (list, GST_TAG_NOMINAL_BITRATE, &flvpad->bitrate) || gst_tag_list_get_uint (list, GST_TAG_BITRATE, &flvpad->bitrate)) { GST_DEBUG_OBJECT (mux, "Stored bitrate for pad %" GST_PTR_FORMAT " = %u", flvpad, flvpad->bitrate); } } static gboolean gst_flv_mux_sink_event (GstAggregator * aggregator, GstAggregatorPad * pad, GstEvent * event) { GstFlvMux *mux = GST_FLV_MUX (aggregator); GstFlvMuxPad *flvpad = (GstFlvMuxPad *) pad; gboolean ret = TRUE; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CAPS: { GstCaps *caps; gst_event_parse_caps (event, &caps); if (mux->video_pad == flvpad) { ret = gst_flv_mux_video_pad_setcaps (flvpad, caps); } else if (mux->audio_pad == flvpad) { ret = gst_flv_mux_audio_pad_setcaps (flvpad, caps); } else { g_assert_not_reached (); } break; } case GST_EVENT_TAG:{ GstTagList *list; GstTagSetter *setter = GST_TAG_SETTER (mux); const GstTagMergeMode mode = gst_tag_setter_get_tag_merge_mode (setter); gst_event_parse_tag (event, &list); gst_tag_setter_merge_tags (setter, list, mode); gst_flv_mux_store_codec_tags (mux, flvpad, list); mux->new_tags = TRUE; ret = TRUE; break; } default: break; } if (!ret) return FALSE; return GST_AGGREGATOR_CLASS (parent_class)->sink_event (aggregator, pad, event);; } static gboolean gst_flv_mux_video_pad_setcaps (GstFlvMuxPad * pad, GstCaps * caps) { GstFlvMux *mux = GST_FLV_MUX (gst_pad_get_parent (pad)); gboolean ret = TRUE; GstStructure *s; guint old_codec; GstBuffer *old_codec_data = NULL; old_codec = pad->codec; if (pad->codec_data) old_codec_data = gst_buffer_ref (pad->codec_data); s = gst_caps_get_structure (caps, 0); if (strcmp (gst_structure_get_name (s), "video/x-flash-video") == 0) { pad->codec = 2; } else if (strcmp (gst_structure_get_name (s), "video/x-flash-screen") == 0) { pad->codec = 3; } else if (strcmp (gst_structure_get_name (s), "video/x-vp6-flash") == 0) { pad->codec = 4; } else if (strcmp (gst_structure_get_name (s), "video/x-vp6-alpha") == 0) { pad->codec = 5; } else if (strcmp (gst_structure_get_name (s), "video/x-h264") == 0) { pad->codec = 7; } else { ret = FALSE; } if (ret && gst_structure_has_field (s, "codec_data")) { const GValue *val = gst_structure_get_value (s, "codec_data"); if (val) gst_buffer_replace (&pad->codec_data, gst_value_get_buffer (val)); else if (!val && pad->codec_data) gst_buffer_unref (pad->codec_data); } if (ret && mux->streamable && mux->state != GST_FLV_MUX_STATE_HEADER) { if (old_codec != pad->codec) { pad->info_changed = TRUE; } if (old_codec_data && pad->codec_data) { GstMapInfo map; gst_buffer_map (old_codec_data, &map, GST_MAP_READ); if (map.size != gst_buffer_get_size (pad->codec_data) || gst_buffer_memcmp (pad->codec_data, 0, map.data, map.size)) pad->info_changed = TRUE; gst_buffer_unmap (old_codec_data, &map); } else if (!old_codec_data && pad->codec_data) { pad->info_changed = TRUE; } if (pad->info_changed) mux->state = GST_FLV_MUX_STATE_HEADER; } if (old_codec_data) gst_buffer_unref (old_codec_data); gst_object_unref (mux); return ret; } static gboolean gst_flv_mux_audio_pad_setcaps (GstFlvMuxPad * pad, GstCaps * caps) { GstFlvMux *mux = GST_FLV_MUX (gst_pad_get_parent (pad)); gboolean ret = TRUE; GstStructure *s; guint old_codec, old_rate, old_width, old_channels; GstBuffer *old_codec_data = NULL; old_codec = pad->codec; old_rate = pad->rate; old_width = pad->width; old_channels = pad->channels; if (pad->codec_data) old_codec_data = gst_buffer_ref (pad->codec_data); s = gst_caps_get_structure (caps, 0); if (strcmp (gst_structure_get_name (s), "audio/x-adpcm") == 0) { const gchar *layout = gst_structure_get_string (s, "layout"); if (layout && strcmp (layout, "swf") == 0) { pad->codec = 1; } else { ret = FALSE; } } else if (strcmp (gst_structure_get_name (s), "audio/mpeg") == 0) { gint mpegversion; if (gst_structure_get_int (s, "mpegversion", &mpegversion)) { if (mpegversion == 1) { gint layer; if (gst_structure_get_int (s, "layer", &layer) && layer == 3) { gint rate; if (gst_structure_get_int (s, "rate", &rate) && rate == 8000) pad->codec = 14; else pad->codec = 2; } else { ret = FALSE; } } else if (mpegversion == 4 || mpegversion == 2) { pad->codec = 10; } else { ret = FALSE; } } else { ret = FALSE; } } else if (strcmp (gst_structure_get_name (s), "audio/x-nellymoser") == 0) { gint rate, channels; if (gst_structure_get_int (s, "rate", &rate) && gst_structure_get_int (s, "channels", &channels)) { if (channels == 1 && rate == 16000) pad->codec = 4; else if (channels == 1 && rate == 8000) pad->codec = 5; else pad->codec = 6; } else { pad->codec = 6; } } else if (strcmp (gst_structure_get_name (s), "audio/x-raw") == 0) { GstAudioInfo info; if (gst_audio_info_from_caps (&info, caps)) { pad->codec = 3; if (GST_AUDIO_INFO_WIDTH (&info) == 8) pad->width = 0; else if (GST_AUDIO_INFO_WIDTH (&info) == 16) pad->width = 1; else ret = FALSE; } else ret = FALSE; } else if (strcmp (gst_structure_get_name (s), "audio/x-alaw") == 0) { pad->codec = 7; } else if (strcmp (gst_structure_get_name (s), "audio/x-mulaw") == 0) { pad->codec = 8; } else if (strcmp (gst_structure_get_name (s), "audio/x-speex") == 0) { pad->codec = 11; } else { ret = FALSE; } if (ret) { gint rate, channels; if (gst_structure_get_int (s, "rate", &rate)) { if (pad->codec == 10) pad->rate = 3; else if (rate == 5512) pad->rate = 0; else if (rate == 11025) pad->rate = 1; else if (rate == 22050) pad->rate = 2; else if (rate == 44100) pad->rate = 3; else if (rate == 8000 && (pad->codec == 5 || pad->codec == 14 || pad->codec == 7 || pad->codec == 8)) pad->rate = 0; else if (rate == 16000 && (pad->codec == 4 || pad->codec == 11)) pad->rate = 0; else ret = FALSE; } else if (pad->codec == 10) { pad->rate = 3; } else { ret = FALSE; } if (gst_structure_get_int (s, "channels", &channels)) { if (pad->codec == 4 || pad->codec == 5 || pad->codec == 6 || pad->codec == 11) pad->channels = 0; else if (pad->codec == 10) pad->channels = 1; else if (channels == 1) pad->channels = 0; else if (channels == 2) pad->channels = 1; else ret = FALSE; } else if (pad->codec == 4 || pad->codec == 5 || pad->codec == 6) { pad->channels = 0; } else if (pad->codec == 10) { pad->channels = 1; } else { ret = FALSE; } if (pad->codec != 3) pad->width = 1; } if (ret && gst_structure_has_field (s, "codec_data")) { const GValue *val = gst_structure_get_value (s, "codec_data"); if (val) gst_buffer_replace (&pad->codec_data, gst_value_get_buffer (val)); else if (!val && pad->codec_data) gst_buffer_unref (pad->codec_data); } if (ret && mux->streamable && mux->state != GST_FLV_MUX_STATE_HEADER) { if (old_codec != pad->codec || old_rate != pad->rate || old_width != pad->width || old_channels != pad->channels) { pad->info_changed = TRUE; } if (old_codec_data && pad->codec_data) { GstMapInfo map; gst_buffer_map (old_codec_data, &map, GST_MAP_READ); if (map.size != gst_buffer_get_size (pad->codec_data) || gst_buffer_memcmp (pad->codec_data, 0, map.data, map.size)) pad->info_changed = TRUE; gst_buffer_unmap (old_codec_data, &map); } else if (!old_codec_data && pad->codec_data) { pad->info_changed = TRUE; } if (pad->info_changed) mux->state = GST_FLV_MUX_STATE_HEADER; } if (old_codec_data) gst_buffer_unref (old_codec_data); gst_object_unref (mux); return ret; } static void gst_flv_mux_reset_pad (GstFlvMuxPad * pad) { GST_DEBUG_OBJECT (pad, "resetting pad"); if (pad->codec_data) gst_buffer_unref (pad->codec_data); pad->codec_data = NULL; pad->codec = G_MAXUINT; pad->rate = G_MAXUINT; pad->width = G_MAXUINT; pad->channels = G_MAXUINT; pad->info_changed = FALSE; pad->drop_deltas = FALSE; gst_flv_mux_pad_flush (GST_AGGREGATOR_PAD_CAST (pad), NULL); } static GstAggregatorPad * gst_flv_mux_create_new_pad (GstAggregator * agg, GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (agg); GstAggregatorPad *aggpad; GstFlvMux *mux = GST_FLV_MUX (agg); GstFlvMuxPad *pad = NULL; const gchar *name = NULL; gboolean video; if (mux->state != GST_FLV_MUX_STATE_HEADER && !mux->streamable) { GST_ELEMENT_WARNING (mux, STREAM, MUX, ("Requested a late stream in a non-streamable file"), ("Stream added after file started and therefore won't be playable")); return NULL; } if (templ == gst_element_class_get_pad_template (klass, "audio")) { if (mux->audio_pad) { GST_WARNING_OBJECT (mux, "Already have an audio pad"); return NULL; } name = "audio"; video = FALSE; } else if (templ == gst_element_class_get_pad_template (klass, "video")) { if (mux->video_pad) { GST_WARNING_OBJECT (mux, "Already have a video pad"); return NULL; } name = "video"; video = TRUE; } else { GST_WARNING_OBJECT (mux, "Invalid template"); return NULL; } aggpad = GST_AGGREGATOR_CLASS (gst_flv_mux_parent_class)->create_new_pad (agg, templ, name, caps); if (aggpad == NULL) return NULL; pad = GST_FLV_MUX_PAD (aggpad); gst_flv_mux_reset_pad (pad); if (video) mux->video_pad = pad; else mux->audio_pad = pad; return aggpad; } static void gst_flv_mux_release_pad (GstElement * element, GstPad * pad) { GstFlvMux *mux = GST_FLV_MUX (element); GstFlvMuxPad *flvpad = GST_FLV_MUX_PAD (gst_object_ref (pad)); GST_ELEMENT_CLASS (gst_flv_mux_parent_class)->release_pad (element, pad); gst_flv_mux_reset_pad (flvpad); if (flvpad == mux->video_pad) { mux->video_pad = NULL; } else if (flvpad == mux->audio_pad) { mux->audio_pad = NULL; } else { GST_WARNING_OBJECT (pad, "Pad is not known audio or video pad"); } gst_object_unref (flvpad); } static GstFlowReturn gst_flv_mux_push (GstFlvMux * mux, GstBuffer * buffer) { GstAggregator *agg = GST_AGGREGATOR (mux); GstAggregatorPad *srcpad = GST_AGGREGATOR_PAD (agg->srcpad); if (GST_BUFFER_PTS_IS_VALID (buffer)) srcpad->segment.position = GST_BUFFER_PTS (buffer); /* pushing the buffer that rewrites the header will make it no longer be the * total output size in bytes, but it doesn't matter at that point */ mux->byte_count += gst_buffer_get_size (buffer); return gst_aggregator_finish_buffer (GST_AGGREGATOR_CAST (mux), buffer); } static GstBuffer * gst_flv_mux_create_header (GstFlvMux * mux) { GstBuffer *header; guint8 *data; gboolean have_audio; gboolean have_video; _gst_buffer_new_and_alloc (9 + 4, &header, &data); data[0] = 'F'; data[1] = 'L'; data[2] = 'V'; data[3] = 0x01; /* Version */ have_audio = (mux->audio_pad && mux->audio_pad->codec != G_MAXUINT); have_video = (mux->video_pad && mux->video_pad->codec != G_MAXUINT); data[4] = (have_audio << 2) | have_video; /* flags */ GST_WRITE_UINT32_BE (data + 5, 9); /* data offset */ GST_WRITE_UINT32_BE (data + 9, 0); /* previous tag size */ return header; } static GstBuffer * gst_flv_mux_preallocate_index (GstFlvMux * mux) { GstBuffer *tmp; guint8 *data; gint preallocate_size; /* preallocate index of size: * - 'keyframes' ECMA array key: 2 + 9 = 11 bytes * - nested ECMA array header, length and end marker: 8 bytes * - 'times' and 'filepositions' keys: 22 bytes * - two strict arrays headers and lengths: 10 bytes * - each index entry: 18 bytes */ preallocate_size = 11 + 8 + 22 + 10 + MAX_INDEX_ENTRIES * 18; GST_DEBUG_OBJECT (mux, "preallocating %d bytes for the index", preallocate_size); _gst_buffer_new_and_alloc (preallocate_size, &tmp, &data); /* prefill the space with a gstfiller: script tag variable */ GST_WRITE_UINT16_BE (data, 9); /* 9 characters */ memcpy (data + 2, "gstfiller", 9); GST_WRITE_UINT8 (data + 11, AMF0_STRING_MARKER); /* a string value */ GST_WRITE_UINT16_BE (data + 12, preallocate_size - 14); memset (data + 14, ' ', preallocate_size - 14); /* the rest is spaces */ return tmp; } static GstBuffer * gst_flv_mux_create_number_script_value (const gchar * name, gdouble value) { GstBuffer *tmp; guint8 *data; gsize len = strlen (name); _gst_buffer_new_and_alloc (2 + len + 1 + 8, &tmp, &data); GST_WRITE_UINT16_BE (data, len); data += 2; /* name length */ memcpy (data, name, len); data += len; *data++ = AMF0_NUMBER_MARKER; /* double type */ GST_WRITE_DOUBLE_BE (data, value); return tmp; } static GstBuffer * gst_flv_mux_create_metadata (GstFlvMux * mux) { const GstTagList *tags; GstBuffer *script_tag, *tmp; GstMapInfo map; guint64 dts; guint8 *data; gint i, n_tags, tags_written = 0; tags = gst_tag_setter_get_tag_list (GST_TAG_SETTER (mux)); dts = mux->last_dts; /* Timestamp must start at zero */ if (GST_CLOCK_TIME_IS_VALID (mux->first_timestamp)) { dts -= mux->first_timestamp / GST_MSECOND; } GST_DEBUG_OBJECT (mux, "Creating metadata, dts %" G_GUINT64_FORMAT ", tags = %" GST_PTR_FORMAT, dts, tags); if (dts > G_MAXUINT32) { GST_LOG_OBJECT (mux, "Detected rollover, timestamp will be truncated (previous:%" G_GUINT64_FORMAT ", new:%u)", dts, (guint32) dts); } /* FIXME perhaps some bytewriter'ing here ... */ _gst_buffer_new_and_alloc (11, &script_tag, &data); data[0] = 18; /* Data size, unknown for now */ data[1] = 0; data[2] = 0; data[3] = 0; /* Timestamp */ GST_WRITE_UINT24_BE (data + 4, dts); data[7] = (((guint) dts) >> 24) & 0xff; /* Stream ID */ data[8] = data[9] = data[10] = 0; _gst_buffer_new_and_alloc (13, &tmp, &data); data[0] = AMF0_STRING_MARKER; /* string */ data[1] = 0; data[2] = 10; /* length 10 */ memcpy (&data[3], "onMetaData", 10); script_tag = gst_buffer_append (script_tag, tmp); n_tags = (tags) ? gst_tag_list_n_tags (tags) : 0; _gst_buffer_new_and_alloc (5, &tmp, &data); data[0] = 8; /* ECMA array */ GST_WRITE_UINT32_BE (data + 1, n_tags); script_tag = gst_buffer_append (script_tag, tmp); /* Some players expect the 'duration' to be always set. Fill it out later, after querying the pads or after getting EOS */ if (!mux->streamable) { tmp = gst_flv_mux_create_number_script_value ("duration", 86400); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; /* Sometimes the information about the total file size is useful for the player. It will be filled later, after getting EOS */ tmp = gst_flv_mux_create_number_script_value ("filesize", 0); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; /* Preallocate space for the index to be written at EOS */ tmp = gst_flv_mux_preallocate_index (mux); script_tag = gst_buffer_append (script_tag, tmp); } else { GST_DEBUG_OBJECT (mux, "not preallocating index, streamable mode"); } for (i = 0; tags && i < n_tags; i++) { const gchar *tag_name = gst_tag_list_nth_tag_name (tags, i); if (!strcmp (tag_name, GST_TAG_DURATION)) { GstClockTime dur; if (!gst_tag_list_get_uint64 (tags, GST_TAG_DURATION, &dur)) continue; mux->duration = dur; } else if (!strcmp (tag_name, GST_TAG_ARTIST) || !strcmp (tag_name, GST_TAG_TITLE)) { gchar *s; const gchar *t = NULL; if (!strcmp (tag_name, GST_TAG_ARTIST)) t = "creator"; else if (!strcmp (tag_name, GST_TAG_TITLE)) t = "title"; if (!gst_tag_list_get_string (tags, tag_name, &s)) continue; _gst_buffer_new_and_alloc (2 + strlen (t) + 1 + 2 + strlen (s), &tmp, &data); data[0] = 0; /* tag name length */ data[1] = strlen (t); memcpy (&data[2], t, strlen (t)); data[2 + strlen (t)] = 2; /* string */ data[3 + strlen (t)] = (strlen (s) >> 8) & 0xff; data[4 + strlen (t)] = (strlen (s)) & 0xff; memcpy (&data[5 + strlen (t)], s, strlen (s)); script_tag = gst_buffer_append (script_tag, tmp); g_free (s); tags_written++; } } if (!mux->streamable && mux->duration == GST_CLOCK_TIME_NONE) { mux->duration = gst_flv_mux_query_upstream_duration (mux); } if (!mux->streamable && mux->duration != GST_CLOCK_TIME_NONE) { gdouble d; GstMapInfo map; d = gst_guint64_to_gdouble (mux->duration); d /= (gdouble) GST_SECOND; GST_DEBUG_OBJECT (mux, "determined the duration to be %f", d); gst_buffer_map (script_tag, &map, GST_MAP_WRITE); GST_WRITE_DOUBLE_BE (map.data + 29 + 2 + 8 + 1, d); gst_buffer_unmap (script_tag, &map); } if (mux->video_pad && mux->video_pad->codec != G_MAXUINT) { GstCaps *caps = NULL; if (mux->video_pad) caps = gst_pad_get_current_caps (GST_PAD (mux->video_pad)); if (caps != NULL) { GstStructure *s; gint size; gint num, den; GST_DEBUG_OBJECT (mux, "putting videocodecid %d in the metadata", mux->video_pad->codec); tmp = gst_flv_mux_create_number_script_value ("videocodecid", mux->video_pad->codec); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; s = gst_caps_get_structure (caps, 0); gst_caps_unref (caps); if (gst_structure_get_int (s, "width", &size)) { GST_DEBUG_OBJECT (mux, "putting width %d in the metadata", size); tmp = gst_flv_mux_create_number_script_value ("width", size); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; } if (gst_structure_get_int (s, "height", &size)) { GST_DEBUG_OBJECT (mux, "putting height %d in the metadata", size); tmp = gst_flv_mux_create_number_script_value ("height", size); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; } if (gst_structure_get_fraction (s, "pixel-aspect-ratio", &num, &den)) { gdouble d; d = num; GST_DEBUG_OBJECT (mux, "putting AspectRatioX %f in the metadata", d); tmp = gst_flv_mux_create_number_script_value ("AspectRatioX", d); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; d = den; GST_DEBUG_OBJECT (mux, "putting AspectRatioY %f in the metadata", d); tmp = gst_flv_mux_create_number_script_value ("AspectRatioY", d); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; } if (gst_structure_get_fraction (s, "framerate", &num, &den)) { gdouble d; gst_util_fraction_to_double (num, den, &d); GST_DEBUG_OBJECT (mux, "putting framerate %f in the metadata", d); tmp = gst_flv_mux_create_number_script_value ("framerate", d); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; } GST_DEBUG_OBJECT (mux, "putting videodatarate %u KB/s in the metadata", mux->video_pad->bitrate / 1024); tmp = gst_flv_mux_create_number_script_value ("videodatarate", mux->video_pad->bitrate / 1024); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; } } if (mux->audio_pad && mux->audio_pad->codec != G_MAXUINT) { GST_DEBUG_OBJECT (mux, "putting audiocodecid %d in the metadata", mux->audio_pad->codec); tmp = gst_flv_mux_create_number_script_value ("audiocodecid", mux->audio_pad->codec); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; GST_DEBUG_OBJECT (mux, "putting audiodatarate %u KB/s in the metadata", mux->audio_pad->bitrate / 1024); tmp = gst_flv_mux_create_number_script_value ("audiodatarate", mux->audio_pad->bitrate / 1024); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; } _gst_buffer_new_and_alloc (2 + 15 + 1 + 2 + strlen (mux->metadatacreator), &tmp, &data); data[0] = 0; /* 15 bytes name */ data[1] = 15; memcpy (&data[2], "metadatacreator", 15); data[17] = 2; /* string */ data[18] = (strlen (mux->metadatacreator) >> 8) & 0xff; data[19] = (strlen (mux->metadatacreator)) & 0xff; memcpy (&data[20], mux->metadatacreator, strlen (mux->metadatacreator)); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; _gst_buffer_new_and_alloc (2 + 7 + 1 + 2 + strlen (mux->encoder), &tmp, &data); data[0] = 0; /* 7 bytes name */ data[1] = 7; memcpy (&data[2], "encoder", 7); data[9] = 2; /* string */ data[10] = (strlen (mux->encoder) >> 8) & 0xff; data[11] = (strlen (mux->encoder)) & 0xff; memcpy (&data[12], mux->encoder, strlen (mux->encoder)); script_tag = gst_buffer_append (script_tag, tmp); tags_written++; { time_t secs; struct tm tm; gchar *s; static const gchar *weekdays[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; static const gchar *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; secs = g_get_real_time () / G_USEC_PER_SEC; #ifdef HAVE_GMTIME_R gmtime_r (&secs, &tm); #else tm = *gmtime (&secs); #endif s = g_strdup_printf ("%s %s %d %02d:%02d:%02d %d", weekdays[tm.tm_wday], months[tm.tm_mon], tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_year + 1900); _gst_buffer_new_and_alloc (2 + 12 + 1 + 2 + strlen (s), &tmp, &data); data[0] = 0; /* 12 bytes name */ data[1] = 12; memcpy (&data[2], "creationdate", 12); data[14] = 2; /* string */ data[15] = (strlen (s) >> 8) & 0xff; data[16] = (strlen (s)) & 0xff; memcpy (&data[17], s, strlen (s)); script_tag = gst_buffer_append (script_tag, tmp); g_free (s); tags_written++; } if (!tags_written) { gst_buffer_unref (script_tag); script_tag = NULL; goto exit; } _gst_buffer_new_and_alloc (2 + 0 + 1, &tmp, &data); data[0] = 0; /* 0 byte size */ data[1] = 0; data[2] = 9; /* end marker */ script_tag = gst_buffer_append (script_tag, tmp); _gst_buffer_new_and_alloc (4, &tmp, &data); GST_WRITE_UINT32_BE (data, gst_buffer_get_size (script_tag)); script_tag = gst_buffer_append (script_tag, tmp); gst_buffer_map (script_tag, &map, GST_MAP_WRITE); map.data[1] = ((gst_buffer_get_size (script_tag) - 11 - 4) >> 16) & 0xff; map.data[2] = ((gst_buffer_get_size (script_tag) - 11 - 4) >> 8) & 0xff; map.data[3] = ((gst_buffer_get_size (script_tag) - 11 - 4) >> 0) & 0xff; GST_WRITE_UINT32_BE (map.data + 11 + 13 + 1, tags_written); gst_buffer_unmap (script_tag, &map); exit: return script_tag; } static GstBuffer * gst_flv_mux_buffer_to_tag_internal (GstFlvMux * mux, GstBuffer * buffer, GstFlvMuxPad * pad, gboolean is_codec_data) { GstBuffer *tag; GstMapInfo map; guint size; guint64 pts, dts, cts; guint8 *data, *bdata = NULL; gsize bsize = 0; if (GST_CLOCK_TIME_IS_VALID (pad->dts)) { pts = pad->pts / GST_MSECOND; dts = pad->dts / GST_MSECOND; GST_LOG_OBJECT (mux, "Pad %s: Created dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT " from rounding %" GST_TIME_FORMAT ", %" GST_TIME_FORMAT, GST_PAD_NAME (pad), GST_TIME_ARGS (dts * GST_MSECOND), GST_TIME_ARGS (pts * GST_MSECOND), GST_TIME_ARGS (pad->dts), GST_TIME_ARGS (pad->pts)); } else if (GST_CLOCK_TIME_IS_VALID (pad->last_timestamp)) { pts = dts = pad->last_timestamp / GST_MSECOND; GST_DEBUG_OBJECT (mux, "Pad %s: Created dts and pts %" GST_TIME_FORMAT " from rounding last pad timestamp %" GST_TIME_FORMAT, GST_PAD_NAME (pad), GST_TIME_ARGS (pts * GST_MSECOND), GST_TIME_ARGS (pad->last_timestamp)); } else { pts = dts = mux->last_dts; GST_DEBUG_OBJECT (mux, "Pad %s: Created dts and pts %" GST_TIME_FORMAT " from last mux timestamp", GST_PAD_NAME (pad), GST_TIME_ARGS (pts * GST_MSECOND)); } /* We prevent backwards timestamps because they confuse librtmp, * it expects timestamps to go forward not only inside one stream, but * also between the audio & video streams. */ if (dts < mux->last_dts) { GST_WARNING_OBJECT (pad, "Got backwards dts! (%" GST_TIME_FORMAT " < %" GST_TIME_FORMAT ")", GST_TIME_ARGS (dts * GST_MSECOND), GST_TIME_ARGS (mux->last_dts * GST_MSECOND)); dts = mux->last_dts; } mux->last_dts = dts; /* Be safe in case TS are buggy */ if (pts > dts) cts = pts - dts; else cts = 0; /* Timestamp must start at zero */ if (GST_CLOCK_TIME_IS_VALID (mux->first_timestamp)) { dts -= mux->first_timestamp / GST_MSECOND; pts = dts + cts; } GST_LOG_OBJECT (mux, "got pts %" G_GUINT64_FORMAT " dts %" G_GUINT64_FORMAT " cts %" G_GUINT64_FORMAT, pts, dts, cts); if (dts > G_MAXUINT32) { GST_LOG_OBJECT (mux, "Detected rollover, timestamp will be truncated (previous:%" G_GUINT64_FORMAT ", new:%u)", dts, (guint32) dts); } if (buffer != NULL) { gst_buffer_map (buffer, &map, GST_MAP_READ); bdata = map.data; bsize = map.size; } size = 11; if (mux->video_pad == pad) { size += 1; if (pad->codec == 7) size += 4 + bsize; else size += bsize; } else { size += 1; if (pad->codec == 10) size += 1 + bsize; else size += bsize; } size += 4; _gst_buffer_new_and_alloc (size, &tag, &data); memset (data, 0, size); data[0] = (mux->video_pad == pad) ? 9 : 8; data[1] = ((size - 11 - 4) >> 16) & 0xff; data[2] = ((size - 11 - 4) >> 8) & 0xff; data[3] = ((size - 11 - 4) >> 0) & 0xff; GST_WRITE_UINT24_BE (data + 4, dts); data[7] = (((guint) dts) >> 24) & 0xff; data[8] = data[9] = data[10] = 0; if (mux->video_pad == pad) { if (buffer && GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT)) data[11] |= 2 << 4; else data[11] |= 1 << 4; data[11] |= pad->codec & 0x0f; if (pad->codec == 7) { if (is_codec_data) { data[12] = 0; GST_WRITE_UINT24_BE (data + 13, 0); } else if (bsize == 0) { /* AVC end of sequence */ data[12] = 2; GST_WRITE_UINT24_BE (data + 13, 0); } else { /* ACV NALU */ data[12] = 1; GST_WRITE_UINT24_BE (data + 13, cts); } memcpy (data + 11 + 1 + 4, bdata, bsize); } else { memcpy (data + 11 + 1, bdata, bsize); } } else { data[11] |= (pad->codec << 4) & 0xf0; data[11] |= (pad->rate << 2) & 0x0c; data[11] |= (pad->width << 1) & 0x02; data[11] |= (pad->channels << 0) & 0x01; GST_LOG_OBJECT (mux, "Creating byte %02x with " "codec:%d, rate:%d, width:%d, channels:%d", data[11], pad->codec, pad->rate, pad->width, pad->channels); if (pad->codec == 10) { data[12] = is_codec_data ? 0 : 1; memcpy (data + 11 + 1 + 1, bdata, bsize); } else { memcpy (data + 11 + 1, bdata, bsize); } } if (buffer) gst_buffer_unmap (buffer, &map); GST_WRITE_UINT32_BE (data + size - 4, size - 4); GST_BUFFER_PTS (tag) = GST_CLOCK_TIME_NONE; GST_BUFFER_DTS (tag) = GST_CLOCK_TIME_NONE; GST_BUFFER_DURATION (tag) = GST_CLOCK_TIME_NONE; if (buffer) { /* if we are streamable we copy over timestamps and offsets, if not just copy the offsets */ if (mux->streamable) { GstClockTime timestamp = GST_CLOCK_TIME_NONE; if (gst_segment_to_running_time_full (&GST_AGGREGATOR_PAD (pad)->segment, GST_FORMAT_TIME, GST_BUFFER_DTS_OR_PTS (buffer), ×tamp) == 1) { GST_BUFFER_PTS (tag) = timestamp; GST_BUFFER_DURATION (tag) = GST_BUFFER_DURATION (buffer); } GST_BUFFER_OFFSET (tag) = GST_BUFFER_OFFSET_NONE; GST_BUFFER_OFFSET_END (tag) = GST_BUFFER_OFFSET_NONE; } else { GST_BUFFER_OFFSET (tag) = GST_BUFFER_OFFSET (buffer); GST_BUFFER_OFFSET_END (tag) = GST_BUFFER_OFFSET_END (buffer); } /* mark the buffer if it's an audio buffer and there's also video being muxed * or it's a video interframe */ if (mux->video_pad == pad && GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT)) GST_BUFFER_FLAG_SET (tag, GST_BUFFER_FLAG_DELTA_UNIT); } else { GST_BUFFER_FLAG_SET (tag, GST_BUFFER_FLAG_DELTA_UNIT); GST_BUFFER_OFFSET (tag) = GST_BUFFER_OFFSET_END (tag) = GST_BUFFER_OFFSET_NONE; } return tag; } static inline GstBuffer * gst_flv_mux_buffer_to_tag (GstFlvMux * mux, GstBuffer * buffer, GstFlvMuxPad * pad) { return gst_flv_mux_buffer_to_tag_internal (mux, buffer, pad, FALSE); } static inline GstBuffer * gst_flv_mux_codec_data_buffer_to_tag (GstFlvMux * mux, GstBuffer * buffer, GstFlvMuxPad * pad) { return gst_flv_mux_buffer_to_tag_internal (mux, buffer, pad, TRUE); } static inline GstBuffer * gst_flv_mux_eos_to_tag (GstFlvMux * mux, GstFlvMuxPad * pad) { return gst_flv_mux_buffer_to_tag_internal (mux, NULL, pad, FALSE); } static void gst_flv_mux_put_buffer_in_streamheader (GValue * streamheader, GstBuffer * buffer) { GValue value = { 0 }; GstBuffer *buf; g_value_init (&value, GST_TYPE_BUFFER); buf = gst_buffer_copy (buffer); gst_value_set_buffer (&value, buf); gst_buffer_unref (buf); gst_value_array_append_value (streamheader, &value); g_value_unset (&value); } static GstCaps * gst_flv_mux_prepare_src_caps (GstFlvMux * mux, GstBuffer ** header_buf, GstBuffer ** metadata_buf, GstBuffer ** video_codec_data_buf, GstBuffer ** audio_codec_data_buf) { GstBuffer *header, *metadata; GstBuffer *video_codec_data, *audio_codec_data; GstCaps *caps; GstStructure *structure; GValue streamheader = { 0 }; GList *l; header = gst_flv_mux_create_header (mux); metadata = gst_flv_mux_create_metadata (mux); video_codec_data = NULL; audio_codec_data = NULL; GST_OBJECT_LOCK (mux); for (l = GST_ELEMENT_CAST (mux)->sinkpads; l != NULL; l = l->next) { GstFlvMuxPad *pad = l->data; /* Get H.264 and AAC codec data, if present */ if (pad && mux->video_pad == pad && pad->codec == 7) { if (pad->codec_data == NULL) GST_WARNING_OBJECT (mux, "Codec data for video stream not found, " "output might not be playable"); else video_codec_data = gst_flv_mux_codec_data_buffer_to_tag (mux, pad->codec_data, pad); } else if (pad && mux->audio_pad == pad && pad->codec == 10) { if (pad->codec_data == NULL) GST_WARNING_OBJECT (mux, "Codec data for audio stream not found, " "output might not be playable"); else audio_codec_data = gst_flv_mux_codec_data_buffer_to_tag (mux, pad->codec_data, pad); } } GST_OBJECT_UNLOCK (mux); /* mark buffers that will go in the streamheader */ GST_BUFFER_FLAG_SET (header, GST_BUFFER_FLAG_HEADER); GST_BUFFER_FLAG_SET (metadata, GST_BUFFER_FLAG_HEADER); if (video_codec_data != NULL) { GST_BUFFER_FLAG_SET (video_codec_data, GST_BUFFER_FLAG_HEADER); /* mark as a delta unit, so downstream will not try to synchronize on that * buffer - to actually start playback you need a real video keyframe */ GST_BUFFER_FLAG_SET (video_codec_data, GST_BUFFER_FLAG_DELTA_UNIT); } if (audio_codec_data != NULL) { GST_BUFFER_FLAG_SET (audio_codec_data, GST_BUFFER_FLAG_HEADER); } /* put buffers in streamheader */ g_value_init (&streamheader, GST_TYPE_ARRAY); gst_flv_mux_put_buffer_in_streamheader (&streamheader, header); gst_flv_mux_put_buffer_in_streamheader (&streamheader, metadata); if (video_codec_data != NULL) gst_flv_mux_put_buffer_in_streamheader (&streamheader, video_codec_data); if (audio_codec_data != NULL) gst_flv_mux_put_buffer_in_streamheader (&streamheader, audio_codec_data); /* create the caps and put the streamheader in them */ caps = gst_caps_new_empty_simple ("video/x-flv"); structure = gst_caps_get_structure (caps, 0); gst_structure_set_value (structure, "streamheader", &streamheader); g_value_unset (&streamheader); if (header_buf) { *header_buf = header; } else { gst_buffer_unref (header); } if (metadata_buf) { *metadata_buf = metadata; } else { gst_buffer_unref (metadata); } if (video_codec_data_buf) { *video_codec_data_buf = video_codec_data; } else if (video_codec_data) { gst_buffer_unref (video_codec_data); } if (audio_codec_data_buf) { *audio_codec_data_buf = audio_codec_data; } else if (audio_codec_data) { gst_buffer_unref (audio_codec_data); } return caps; } static GstFlowReturn gst_flv_mux_write_header (GstFlvMux * mux) { GstBuffer *header, *metadata; GstBuffer *video_codec_data, *audio_codec_data; GstCaps *caps; GstFlowReturn ret; header = metadata = video_codec_data = audio_codec_data = NULL; /* if not streaming, check if downstream is seekable */ if (!mux->streamable) { gboolean seekable; GstQuery *query; query = gst_query_new_seeking (GST_FORMAT_BYTES); if (gst_pad_peer_query (mux->srcpad, query)) { gst_query_parse_seeking (query, NULL, &seekable, NULL, NULL); GST_INFO_OBJECT (mux, "downstream is %sseekable", seekable ? "" : "not "); } else { /* have to assume seeking is supported if query not handled downstream */ GST_WARNING_OBJECT (mux, "downstream did not handle seeking query"); seekable = FALSE; } if (!seekable) { mux->streamable = TRUE; g_object_notify (G_OBJECT (mux), "streamable"); GST_WARNING_OBJECT (mux, "downstream is not seekable, but " "streamable=false. Will ignore that and create streamable output " "instead"); } gst_query_unref (query); } if (mux->streamable && mux->sent_header) { GstBuffer **video_codec_data_p = NULL, **audio_codec_data_p = NULL; if (mux->video_pad && mux->video_pad->info_changed) video_codec_data_p = &video_codec_data; if (mux->audio_pad && mux->audio_pad->info_changed) audio_codec_data_p = &audio_codec_data; caps = gst_flv_mux_prepare_src_caps (mux, NULL, NULL, video_codec_data_p, audio_codec_data_p); } else { caps = gst_flv_mux_prepare_src_caps (mux, &header, &metadata, &video_codec_data, &audio_codec_data); } gst_aggregator_set_src_caps (GST_AGGREGATOR_CAST (mux), caps); gst_caps_unref (caps); /* push the header buffer, the metadata and the codec info, if any */ if (header != NULL) { ret = gst_flv_mux_push (mux, header); if (ret != GST_FLOW_OK) goto failure_header; mux->sent_header = TRUE; } if (metadata != NULL) { ret = gst_flv_mux_push (mux, metadata); if (ret != GST_FLOW_OK) goto failure_metadata; mux->new_tags = FALSE; } if (video_codec_data != NULL) { ret = gst_flv_mux_push (mux, video_codec_data); if (ret != GST_FLOW_OK) goto failure_video_codec_data; mux->video_pad->info_changed = FALSE; } if (audio_codec_data != NULL) { ret = gst_flv_mux_push (mux, audio_codec_data); if (ret != GST_FLOW_OK) goto failure_audio_codec_data; mux->audio_pad->info_changed = FALSE; } return GST_FLOW_OK; failure_header: gst_buffer_unref (metadata); failure_metadata: if (video_codec_data != NULL) gst_buffer_unref (video_codec_data); failure_video_codec_data: if (audio_codec_data != NULL) gst_buffer_unref (audio_codec_data); failure_audio_codec_data: return ret; } static GstClockTime gst_flv_mux_segment_to_running_time (const GstSegment * segment, GstClockTime t) { /* we can get a dts before the segment, if dts < pts and pts is inside * the segment, so we consider early times as 0 */ if (t < segment->start) return 0; return gst_segment_to_running_time (segment, GST_FORMAT_TIME, t); } static void gst_flv_mux_update_index (GstFlvMux * mux, GstBuffer * buffer, GstFlvMuxPad * pad) { /* * Add the tag byte offset and to the index if it's a valid seek point, which * means it's either a video keyframe or if there is no video pad (in that * case every FLV tag is a valid seek point) */ if (mux->video_pad == pad && GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT)) return; if (GST_BUFFER_PTS_IS_VALID (buffer)) { GstFlvMuxIndexEntry *entry = g_slice_new (GstFlvMuxIndexEntry); GstClockTime pts = gst_flv_mux_segment_to_running_time (&GST_AGGREGATOR_PAD (pad)->segment, GST_BUFFER_PTS (buffer)); entry->position = mux->byte_count; entry->time = gst_guint64_to_gdouble (pts) / GST_SECOND; mux->index = g_list_prepend (mux->index, entry); } } static GstFlowReturn gst_flv_mux_write_buffer (GstFlvMux * mux, GstFlvMuxPad * pad, GstBuffer * buffer) { GstBuffer *tag; GstFlowReturn ret; GstClockTime dts = gst_flv_mux_segment_to_running_time (&GST_AGGREGATOR_PAD (pad)->segment, GST_BUFFER_DTS (buffer)); /* clipping function arranged for running_time */ if (!mux->streamable) gst_flv_mux_update_index (mux, buffer, pad); tag = gst_flv_mux_buffer_to_tag (mux, buffer, pad); gst_buffer_unref (buffer); ret = gst_flv_mux_push (mux, tag); if (ret == GST_FLOW_OK && GST_CLOCK_TIME_IS_VALID (dts)) pad->last_timestamp = dts; return ret; } static guint64 gst_flv_mux_determine_duration (GstFlvMux * mux) { GList *l; GstClockTime duration = GST_CLOCK_TIME_NONE; GST_DEBUG_OBJECT (mux, "trying to determine the duration " "from pad timestamps"); GST_OBJECT_LOCK (mux); for (l = GST_ELEMENT_CAST (mux)->sinkpads; l != NULL; l = l->next) { GstFlvMuxPad *pad = GST_FLV_MUX_PAD (l->data); if (pad && (pad->last_timestamp != GST_CLOCK_TIME_NONE)) { if (duration == GST_CLOCK_TIME_NONE) duration = pad->last_timestamp; else duration = MAX (duration, pad->last_timestamp); } } GST_OBJECT_UNLOCK (mux); return duration; } struct DurationData { GstClockTime duration; }; static gboolean duration_query_cb (GstElement * element, GstPad * pad, struct DurationData *data) { GstClockTime dur; if (gst_pad_peer_query_duration (GST_PAD (pad), GST_FORMAT_TIME, (gint64 *) & dur) && dur != GST_CLOCK_TIME_NONE) { if (data->duration == GST_CLOCK_TIME_NONE) data->duration = dur; else data->duration = MAX (dur, data->duration); } return TRUE; } static GstClockTime gst_flv_mux_query_upstream_duration (GstFlvMux * mux) { struct DurationData cb_data = { GST_CLOCK_TIME_NONE }; gst_element_foreach_sink_pad (GST_ELEMENT (mux), (GstElementForeachPadFunc) (duration_query_cb), &cb_data); return cb_data.duration; } static gboolean gst_flv_mux_are_all_pads_eos (GstFlvMux * mux) { GList *l; GST_OBJECT_LOCK (mux); for (l = GST_ELEMENT_CAST (mux)->sinkpads; l; l = l->next) { GstFlvMuxPad *pad = GST_FLV_MUX_PAD (l->data); if (!gst_aggregator_pad_is_eos (GST_AGGREGATOR_PAD (pad))) { GST_OBJECT_UNLOCK (mux); return FALSE; } } GST_OBJECT_UNLOCK (mux); return TRUE; } static GstFlowReturn gst_flv_mux_write_eos (GstFlvMux * mux) { GstBuffer *tag; if (mux->video_pad == NULL) return GST_FLOW_OK; tag = gst_flv_mux_eos_to_tag (mux, mux->video_pad); return gst_flv_mux_push (mux, tag); } static GstFlowReturn gst_flv_mux_rewrite_header (GstFlvMux * mux) { GstBuffer *rewrite, *index, *tmp; GstEvent *event; guint8 *data; gdouble d; GList *l; guint32 index_len, allocate_size; guint32 i, index_skip; GstSegment segment; GstClockTime dur; if (mux->streamable) return GST_FLOW_OK; /* seek back to the preallocated index space */ gst_segment_init (&segment, GST_FORMAT_BYTES); segment.start = segment.time = 13 + 29; event = gst_event_new_segment (&segment); if (!gst_pad_push_event (mux->srcpad, event)) { GST_WARNING_OBJECT (mux, "Seek to rewrite header failed"); return GST_FLOW_OK; } /* determine duration now based on our own timestamping, * so that it is likely many times better and consistent * than whatever obtained by some query */ dur = gst_flv_mux_determine_duration (mux); if (dur != GST_CLOCK_TIME_NONE) mux->duration = dur; /* rewrite the duration tag */ d = gst_guint64_to_gdouble (mux->duration); d /= (gdouble) GST_SECOND; GST_DEBUG_OBJECT (mux, "determined the final duration to be %f", d); rewrite = gst_flv_mux_create_number_script_value ("duration", d); /* rewrite the filesize tag */ d = gst_guint64_to_gdouble (mux->byte_count); GST_DEBUG_OBJECT (mux, "putting total filesize %f in the metadata", d); tmp = gst_flv_mux_create_number_script_value ("filesize", d); rewrite = gst_buffer_append (rewrite, tmp); if (!mux->index) { /* no index, so push buffer and return */ return gst_flv_mux_push (mux, rewrite); } /* rewrite the index */ mux->index = g_list_reverse (mux->index); index_len = g_list_length (mux->index); /* We write at most MAX_INDEX_ENTRIES elements */ if (index_len > MAX_INDEX_ENTRIES) { index_skip = 1 + index_len / MAX_INDEX_ENTRIES; index_len = (index_len + index_skip - 1) / index_skip; } else { index_skip = 1; } GST_DEBUG_OBJECT (mux, "Index length is %d", index_len); /* see size calculation in gst_flv_mux_preallocate_index */ allocate_size = 11 + 8 + 22 + 10 + index_len * 18; GST_DEBUG_OBJECT (mux, "Allocating %d bytes for index", allocate_size); _gst_buffer_new_and_alloc (allocate_size, &index, &data); GST_WRITE_UINT16_BE (data, 9); /* the 'keyframes' key */ memcpy (data + 2, "keyframes", 9); GST_WRITE_UINT8 (data + 11, 8); /* nested ECMA array */ GST_WRITE_UINT32_BE (data + 12, 2); /* two elements */ GST_WRITE_UINT16_BE (data + 16, 5); /* first string key: 'times' */ memcpy (data + 18, "times", 5); GST_WRITE_UINT8 (data + 23, 10); /* strict array */ GST_WRITE_UINT32_BE (data + 24, index_len); data += 28; /* the keyframes' times */ for (i = 0, l = mux->index; l; l = l->next, i++) { GstFlvMuxIndexEntry *entry = l->data; if (i % index_skip != 0) continue; GST_WRITE_UINT8 (data, 0); /* numeric (aka double) */ GST_WRITE_DOUBLE_BE (data + 1, entry->time); data += 9; } GST_WRITE_UINT16_BE (data, 13); /* second string key: 'filepositions' */ memcpy (data + 2, "filepositions", 13); GST_WRITE_UINT8 (data + 15, 10); /* strict array */ GST_WRITE_UINT32_BE (data + 16, index_len); data += 20; /* the keyframes' file positions */ for (i = 0, l = mux->index; l; l = l->next, i++) { GstFlvMuxIndexEntry *entry = l->data; if (i % index_skip != 0) continue; GST_WRITE_UINT8 (data, 0); GST_WRITE_DOUBLE_BE (data + 1, entry->position); data += 9; } GST_WRITE_UINT24_BE (data, 9); /* finish the ECMA array */ /* If there is space left in the prefilled area, reinsert the filler. There is at least 18 bytes free, so it will always fit. */ if (index_len < MAX_INDEX_ENTRIES) { GstBuffer *tmp; guint8 *data; guint32 remaining_filler_size; _gst_buffer_new_and_alloc (14, &tmp, &data); GST_WRITE_UINT16_BE (data, 9); memcpy (data + 2, "gstfiller", 9); GST_WRITE_UINT8 (data + 11, 2); /* string */ /* There is 18 bytes per remaining index entry minus what is used for * the'gstfiller' key. The rest is already filled with spaces, so just need * to update length. */ remaining_filler_size = (MAX_INDEX_ENTRIES - index_len) * 18 - 14; GST_DEBUG_OBJECT (mux, "Remaining filler size is %d bytes", remaining_filler_size); GST_WRITE_UINT16_BE (data + 12, remaining_filler_size); index = gst_buffer_append (index, tmp); } rewrite = gst_buffer_append (rewrite, index); return gst_flv_mux_push (mux, rewrite); } /* Returns NULL, or a reference to the pad with the * buffer with lowest running time */ static GstFlvMuxPad * gst_flv_mux_find_best_pad (GstAggregator * aggregator, GstClockTime * ts, gboolean timeout) { GstFlvMuxPad *best = NULL; GstClockTime best_ts = GST_CLOCK_TIME_NONE; GstIterator *pads; GValue padptr = { 0, }; gboolean done = FALSE; pads = gst_element_iterate_sink_pads (GST_ELEMENT (aggregator)); while (!done) { switch (gst_iterator_next (pads, &padptr)) { case GST_ITERATOR_OK:{ GstAggregatorPad *apad = g_value_get_object (&padptr); GstClockTime t = GST_CLOCK_TIME_NONE; GstBuffer *buffer; buffer = gst_aggregator_pad_peek_buffer (apad); if (!buffer) { if (!timeout && !GST_PAD_IS_EOS (apad)) { gst_object_replace ((GstObject **) & best, NULL); best_ts = GST_CLOCK_TIME_NONE; done = TRUE; } break; } if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS_OR_PTS (buffer))) { t = gst_flv_mux_segment_to_running_time (&apad->segment, GST_BUFFER_DTS_OR_PTS (buffer)); } if (!GST_CLOCK_TIME_IS_VALID (best_ts) || (GST_CLOCK_TIME_IS_VALID (t) && t < best_ts)) { gst_object_replace ((GstObject **) & best, GST_OBJECT (apad)); best_ts = t; } gst_buffer_unref (buffer); break; } case GST_ITERATOR_DONE: done = TRUE; break; case GST_ITERATOR_RESYNC: gst_iterator_resync (pads); /* Clear the best pad and start again. It might have disappeared */ gst_object_replace ((GstObject **) & best, NULL); best_ts = GST_CLOCK_TIME_NONE; break; case GST_ITERATOR_ERROR: /* This can't happen if the parameters to gst_iterator_next() are valid */ g_assert_not_reached (); break; } g_value_reset (&padptr); } g_value_unset (&padptr); gst_iterator_free (pads); if (best) { GST_DEBUG_OBJECT (aggregator, "Best pad found with TS %" GST_TIME_FORMAT ": %" GST_PTR_FORMAT, GST_TIME_ARGS (best_ts), best); } else { GST_DEBUG_OBJECT (aggregator, "Best pad not found"); } if (ts) *ts = best_ts; return best; } static GstFlowReturn gst_flv_mux_aggregate (GstAggregator * aggregator, gboolean timeout) { GstFlvMux *mux = GST_FLV_MUX (aggregator); GstFlvMuxPad *best; GstClockTime best_time = GST_CLOCK_TIME_NONE; GstFlowReturn ret; GstClockTime ts; GstBuffer *buffer = NULL; if (mux->state == GST_FLV_MUX_STATE_HEADER) { if (GST_ELEMENT_CAST (mux)->sinkpads == NULL) { GST_ELEMENT_ERROR (mux, STREAM, MUX, (NULL), ("No input streams configured")); return GST_FLOW_ERROR; } best = gst_flv_mux_find_best_pad (aggregator, &ts, timeout); if (!best) { if (!gst_flv_mux_are_all_pads_eos (mux)) return GST_AGGREGATOR_FLOW_NEED_DATA; else return GST_FLOW_OK; } ret = gst_flv_mux_write_header (mux); if (ret != GST_FLOW_OK) { gst_object_unref (best); return ret; } mux->state = GST_FLV_MUX_STATE_DATA; if (!mux->streamable || mux->first_timestamp == GST_CLOCK_TIME_NONE) { if (best && GST_CLOCK_TIME_IS_VALID (ts)) mux->first_timestamp = ts; else mux->first_timestamp = 0; } } else { best = gst_flv_mux_find_best_pad (aggregator, &ts, timeout); } if (best) { buffer = gst_aggregator_pad_pop_buffer (GST_AGGREGATOR_PAD (best)); if (!buffer) { /* We might have gotten a flush event after we picked the pad */ gst_object_unref (best); return GST_AGGREGATOR_FLOW_NEED_DATA; } } if (mux->new_tags && mux->streamable) { GstBuffer *buf = gst_flv_mux_create_metadata (mux); if (buf) gst_flv_mux_push (mux, buf); mux->new_tags = FALSE; } if (best) { best->dts = gst_flv_mux_segment_to_running_time (&GST_AGGREGATOR_PAD (best)->segment, GST_BUFFER_DTS_OR_PTS (buffer)); if (GST_CLOCK_TIME_IS_VALID (best->dts)) best_time = best->dts - mux->first_timestamp; if (GST_BUFFER_PTS_IS_VALID (buffer)) best->pts = gst_flv_mux_segment_to_running_time (&GST_AGGREGATOR_PAD (best)->segment, GST_BUFFER_PTS (buffer)); else best->pts = best->dts; GST_LOG_OBJECT (best, "got buffer PTS %" GST_TIME_FORMAT " DTS %" GST_TIME_FORMAT, GST_TIME_ARGS (best->pts), GST_TIME_ARGS (best->dts)); } else { if (!gst_flv_mux_are_all_pads_eos (mux)) return GST_AGGREGATOR_FLOW_NEED_DATA; best_time = GST_CLOCK_STIME_NONE; } /* The FLV timestamp is an int32 field. For non-live streams error out if a bigger timestamp is seen, for live the timestamp will get wrapped in gst_flv_mux_buffer_to_tag */ if (!mux->streamable && (GST_CLOCK_TIME_IS_VALID (best_time)) && best_time / GST_MSECOND > G_MAXINT32) { GST_WARNING_OBJECT (mux, "Timestamp larger than FLV supports - EOS"); if (buffer) { gst_buffer_unref (buffer); buffer = NULL; } gst_object_unref (best); best = NULL; } if (best) { GstFlowReturn ret = gst_flv_mux_write_buffer (mux, best, buffer); gst_object_unref (best); return ret; } else { if (gst_flv_mux_are_all_pads_eos (mux)) { gst_flv_mux_write_eos (mux); gst_flv_mux_rewrite_header (mux); return GST_FLOW_EOS; } return GST_FLOW_OK; } } static void gst_flv_mux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstFlvMux *mux = GST_FLV_MUX (object); switch (prop_id) { case PROP_STREAMABLE: g_value_set_boolean (value, mux->streamable); break; case PROP_METADATACREATOR: g_value_set_string (value, mux->metadatacreator); break; case PROP_ENCODER: g_value_set_string (value, mux->encoder); break; case PROP_SKIP_BACKWARDS_STREAMS: g_value_set_boolean (value, mux->skip_backwards_streams); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_flv_mux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstFlvMux *mux = GST_FLV_MUX (object); switch (prop_id) { case PROP_STREAMABLE: mux->streamable = g_value_get_boolean (value); if (mux->streamable) gst_tag_setter_set_tag_merge_mode (GST_TAG_SETTER (mux), GST_TAG_MERGE_REPLACE); else gst_tag_setter_set_tag_merge_mode (GST_TAG_SETTER (mux), GST_TAG_MERGE_KEEP); break; case PROP_METADATACREATOR: g_free (mux->metadatacreator); if (!g_value_get_string (value)) { GST_WARNING_OBJECT (mux, "metadatacreator property can not be NULL"); mux->metadatacreator = g_strdup (DEFAULT_METADATACREATOR); } else { mux->metadatacreator = g_value_dup_string (value); } break; case PROP_ENCODER: g_free (mux->encoder); if (!g_value_get_string (value)) { GST_WARNING_OBJECT (mux, "encoder property can not be NULL"); mux->encoder = g_strdup (DEFAULT_METADATACREATOR); } else { mux->encoder = g_value_dup_string (value); } break; case PROP_SKIP_BACKWARDS_STREAMS: mux->skip_backwards_streams = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstClockTime gst_flv_mux_get_next_time (GstAggregator * aggregator) { GstFlvMux *mux = GST_FLV_MUX (aggregator); GstAggregatorPad *agg_audio_pad = GST_AGGREGATOR_PAD_CAST (mux->audio_pad); GstAggregatorPad *agg_video_pad = GST_AGGREGATOR_PAD_CAST (mux->video_pad); GST_OBJECT_LOCK (aggregator); if (mux->state == GST_FLV_MUX_STATE_HEADER && ((mux->audio_pad && mux->audio_pad->codec == G_MAXUINT) || (mux->video_pad && mux->video_pad->codec == G_MAXUINT))) goto wait_for_data; if (!((agg_audio_pad && gst_aggregator_pad_has_buffer (agg_audio_pad)) || (agg_video_pad && gst_aggregator_pad_has_buffer (agg_video_pad)))) goto wait_for_data; GST_OBJECT_UNLOCK (aggregator); return gst_aggregator_simple_get_next_time (aggregator); wait_for_data: GST_OBJECT_UNLOCK (aggregator); return GST_CLOCK_TIME_NONE; }