/* GStreamer * Copyright (C) <2006> Philippe Khalaf * * 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:gstrtpbaseaudiopayload * @title: GstRTPBaseAudioPayload * @short_description: Base class for audio RTP payloader * * Provides a base class for audio RTP payloaders for frame or sample based * audio codecs (constant bitrate) * * This class derives from GstRTPBasePayload. It can be used for payloading * audio codecs. It will only work with constant bitrate codecs. It supports * both frame based and sample based codecs. It takes care of packing up the * audio data into RTP packets and filling up the headers accordingly. The * payloading is done based on the maximum MTU (mtu) and the maximum time per * packet (max-ptime). The general idea is to divide large data buffers into * smaller RTP packets. The RTP packet size is the minimum of either the MTU, * max-ptime (if set) or available data. The RTP packet size is always larger or * equal to min-ptime (if set). If min-ptime is not set, any residual data is * sent in a last RTP packet. In the case of frame based codecs, the resulting * RTP packets always contain full frames. * * ## Usage * * To use this base class, your child element needs to call either * gst_rtp_base_audio_payload_set_frame_based() or * gst_rtp_base_audio_payload_set_sample_based(). This is usually done in the * element's _init() function. Then, the child element must call either * gst_rtp_base_audio_payload_set_frame_options(), * gst_rtp_base_audio_payload_set_sample_options() or * gst_rtp_base_audio_payload_set_samplebits_options. Since * GstRTPBaseAudioPayload derives from GstRTPBasePayload, the child element * must set any variables or call/override any functions required by that base * class. The child element does not need to override any other functions * specific to GstRTPBaseAudioPayload. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include "gstrtpbaseaudiopayload.h" GST_DEBUG_CATEGORY_STATIC (rtpbaseaudiopayload_debug); #define GST_CAT_DEFAULT (rtpbaseaudiopayload_debug) #define DEFAULT_BUFFER_LIST FALSE enum { PROP_0, PROP_BUFFER_LIST, PROP_LAST }; /* function to convert bytes to a time */ typedef GstClockTime (*GetBytesToTimeFunc) (GstRTPBaseAudioPayload * payload, guint64 bytes); /* function to convert bytes to a RTP time */ typedef guint32 (*GetBytesToRTPTimeFunc) (GstRTPBaseAudioPayload * payload, guint64 bytes); /* function to convert time to bytes */ typedef guint64 (*GetTimeToBytesFunc) (GstRTPBaseAudioPayload * payload, GstClockTime time); struct _GstRTPBaseAudioPayloadPrivate { GetBytesToTimeFunc bytes_to_time; GetBytesToRTPTimeFunc bytes_to_rtptime; GetTimeToBytesFunc time_to_bytes; GstAdapter *adapter; guint fragment_size; GstClockTime frame_duration_ns; gboolean discont; guint64 offset; GstClockTime last_timestamp; guint32 last_rtptime; guint align; guint cached_mtu; guint cached_min_ptime; guint cached_max_ptime; guint cached_ptime; guint cached_min_length; guint cached_max_length; guint cached_ptime_multiple; guint cached_align; gboolean buffer_list; }; #define GST_RTP_BASE_AUDIO_PAYLOAD_GET_PRIVATE(o) \ (G_TYPE_INSTANCE_GET_PRIVATE ((o), GST_TYPE_RTP_BASE_AUDIO_PAYLOAD, \ GstRTPBaseAudioPayloadPrivate)) static void gst_rtp_base_audio_payload_finalize (GObject * object); static void gst_rtp_base_audio_payload_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_rtp_base_audio_payload_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); /* bytes to time functions */ static GstClockTime gst_rtp_base_audio_payload_frame_bytes_to_time (GstRTPBaseAudioPayload * payload, guint64 bytes); static GstClockTime gst_rtp_base_audio_payload_sample_bytes_to_time (GstRTPBaseAudioPayload * payload, guint64 bytes); /* bytes to RTP time functions */ static guint32 gst_rtp_base_audio_payload_frame_bytes_to_rtptime (GstRTPBaseAudioPayload * payload, guint64 bytes); static guint32 gst_rtp_base_audio_payload_sample_bytes_to_rtptime (GstRTPBaseAudioPayload * payload, guint64 bytes); /* time to bytes functions */ static guint64 gst_rtp_base_audio_payload_frame_time_to_bytes (GstRTPBaseAudioPayload * payload, GstClockTime time); static guint64 gst_rtp_base_audio_payload_sample_time_to_bytes (GstRTPBaseAudioPayload * payload, GstClockTime time); static GstFlowReturn gst_rtp_base_audio_payload_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer); static GstStateChangeReturn gst_rtp_base_payload_audio_change_state (GstElement * element, GstStateChange transition); static gboolean gst_rtp_base_payload_audio_sink_event (GstRTPBasePayload * payload, GstEvent * event); #define gst_rtp_base_audio_payload_parent_class parent_class G_DEFINE_TYPE (GstRTPBaseAudioPayload, gst_rtp_base_audio_payload, GST_TYPE_RTP_BASE_PAYLOAD); static void gst_rtp_base_audio_payload_class_init (GstRTPBaseAudioPayloadClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstRTPBasePayloadClass *gstrtpbasepayload_class; g_type_class_add_private (klass, sizeof (GstRTPBaseAudioPayloadPrivate)); gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass; gobject_class->finalize = gst_rtp_base_audio_payload_finalize; gobject_class->set_property = gst_rtp_base_audio_payload_set_property; gobject_class->get_property = gst_rtp_base_audio_payload_get_property; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BUFFER_LIST, g_param_spec_boolean ("buffer-list", "Buffer List", "Use Buffer Lists", DEFAULT_BUFFER_LIST, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_rtp_base_payload_audio_change_state); gstrtpbasepayload_class->handle_buffer = GST_DEBUG_FUNCPTR (gst_rtp_base_audio_payload_handle_buffer); gstrtpbasepayload_class->sink_event = GST_DEBUG_FUNCPTR (gst_rtp_base_payload_audio_sink_event); GST_DEBUG_CATEGORY_INIT (rtpbaseaudiopayload_debug, "rtpbaseaudiopayload", 0, "base audio RTP payloader"); } static void gst_rtp_base_audio_payload_init (GstRTPBaseAudioPayload * payload) { payload->priv = GST_RTP_BASE_AUDIO_PAYLOAD_GET_PRIVATE (payload); /* these need to be set by child object if frame based */ payload->frame_size = 0; payload->frame_duration = 0; /* these need to be set by child object if sample based */ payload->sample_size = 0; payload->priv->adapter = gst_adapter_new (); payload->priv->buffer_list = DEFAULT_BUFFER_LIST; } static void gst_rtp_base_audio_payload_finalize (GObject * object) { GstRTPBaseAudioPayload *payload; payload = GST_RTP_BASE_AUDIO_PAYLOAD (object); g_object_unref (payload->priv->adapter); GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object)); } static void gst_rtp_base_audio_payload_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRTPBaseAudioPayload *payload; payload = GST_RTP_BASE_AUDIO_PAYLOAD (object); switch (prop_id) { case PROP_BUFFER_LIST: #if 0 payload->priv->buffer_list = g_value_get_boolean (value); #endif payload->priv->buffer_list = FALSE; break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_rtp_base_audio_payload_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRTPBaseAudioPayload *payload; payload = GST_RTP_BASE_AUDIO_PAYLOAD (object); switch (prop_id) { case PROP_BUFFER_LIST: g_value_set_boolean (value, payload->priv->buffer_list); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /** * gst_rtp_base_audio_payload_set_frame_based: * @rtpbaseaudiopayload: a pointer to the element. * * Tells #GstRTPBaseAudioPayload that the child element is for a frame based * audio codec */ void gst_rtp_base_audio_payload_set_frame_based (GstRTPBaseAudioPayload * rtpbaseaudiopayload) { g_return_if_fail (rtpbaseaudiopayload != NULL); g_return_if_fail (rtpbaseaudiopayload->priv->time_to_bytes == NULL); g_return_if_fail (rtpbaseaudiopayload->priv->bytes_to_time == NULL); g_return_if_fail (rtpbaseaudiopayload->priv->bytes_to_rtptime == NULL); rtpbaseaudiopayload->priv->bytes_to_time = gst_rtp_base_audio_payload_frame_bytes_to_time; rtpbaseaudiopayload->priv->bytes_to_rtptime = gst_rtp_base_audio_payload_frame_bytes_to_rtptime; rtpbaseaudiopayload->priv->time_to_bytes = gst_rtp_base_audio_payload_frame_time_to_bytes; } /** * gst_rtp_base_audio_payload_set_sample_based: * @rtpbaseaudiopayload: a pointer to the element. * * Tells #GstRTPBaseAudioPayload that the child element is for a sample based * audio codec */ void gst_rtp_base_audio_payload_set_sample_based (GstRTPBaseAudioPayload * rtpbaseaudiopayload) { g_return_if_fail (rtpbaseaudiopayload != NULL); g_return_if_fail (rtpbaseaudiopayload->priv->time_to_bytes == NULL); g_return_if_fail (rtpbaseaudiopayload->priv->bytes_to_time == NULL); g_return_if_fail (rtpbaseaudiopayload->priv->bytes_to_rtptime == NULL); rtpbaseaudiopayload->priv->bytes_to_time = gst_rtp_base_audio_payload_sample_bytes_to_time; rtpbaseaudiopayload->priv->bytes_to_rtptime = gst_rtp_base_audio_payload_sample_bytes_to_rtptime; rtpbaseaudiopayload->priv->time_to_bytes = gst_rtp_base_audio_payload_sample_time_to_bytes; } /** * gst_rtp_base_audio_payload_set_frame_options: * @rtpbaseaudiopayload: a pointer to the element. * @frame_duration: The duraction of an audio frame in milliseconds. * @frame_size: The size of an audio frame in bytes. * * Sets the options for frame based audio codecs. * */ void gst_rtp_base_audio_payload_set_frame_options (GstRTPBaseAudioPayload * rtpbaseaudiopayload, gint frame_duration, gint frame_size) { GstRTPBaseAudioPayloadPrivate *priv; g_return_if_fail (rtpbaseaudiopayload != NULL); priv = rtpbaseaudiopayload->priv; rtpbaseaudiopayload->frame_duration = frame_duration; priv->frame_duration_ns = frame_duration * GST_MSECOND; rtpbaseaudiopayload->frame_size = frame_size; priv->align = frame_size; gst_adapter_clear (priv->adapter); GST_DEBUG_OBJECT (rtpbaseaudiopayload, "frame set to %d ms and size %d", frame_duration, frame_size); } /** * gst_rtp_base_audio_payload_set_sample_options: * @rtpbaseaudiopayload: a pointer to the element. * @sample_size: Size per sample in bytes. * * Sets the options for sample based audio codecs. */ void gst_rtp_base_audio_payload_set_sample_options (GstRTPBaseAudioPayload * rtpbaseaudiopayload, gint sample_size) { g_return_if_fail (rtpbaseaudiopayload != NULL); /* sample_size is in bits internally */ gst_rtp_base_audio_payload_set_samplebits_options (rtpbaseaudiopayload, sample_size * 8); } /** * gst_rtp_base_audio_payload_set_samplebits_options: * @rtpbaseaudiopayload: a pointer to the element. * @sample_size: Size per sample in bits. * * Sets the options for sample based audio codecs. */ void gst_rtp_base_audio_payload_set_samplebits_options (GstRTPBaseAudioPayload * rtpbaseaudiopayload, gint sample_size) { guint fragment_size; GstRTPBaseAudioPayloadPrivate *priv; g_return_if_fail (rtpbaseaudiopayload != NULL); priv = rtpbaseaudiopayload->priv; rtpbaseaudiopayload->sample_size = sample_size; /* sample_size is in bits and is converted into multiple bytes */ fragment_size = sample_size; while ((fragment_size % 8) != 0) fragment_size += fragment_size; priv->fragment_size = fragment_size / 8; priv->align = priv->fragment_size; gst_adapter_clear (priv->adapter); GST_DEBUG_OBJECT (rtpbaseaudiopayload, "Samplebits set to sample size %d bits", sample_size); } static void gst_rtp_base_audio_payload_set_meta (GstRTPBaseAudioPayload * payload, GstBuffer * buffer, guint payload_len, GstClockTime timestamp) { GstRTPBasePayload *basepayload; GstRTPBaseAudioPayloadPrivate *priv; GstRTPBuffer rtp = { NULL }; basepayload = GST_RTP_BASE_PAYLOAD_CAST (payload); priv = payload->priv; /* set payload type */ gst_rtp_buffer_map (buffer, GST_MAP_WRITE, &rtp); gst_rtp_buffer_set_payload_type (&rtp, basepayload->pt); /* set marker bit for disconts */ if (priv->discont) { GST_DEBUG_OBJECT (payload, "Setting marker and DISCONT"); gst_rtp_buffer_set_marker (&rtp, TRUE); GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT); priv->discont = FALSE; } gst_rtp_buffer_unmap (&rtp); GST_BUFFER_PTS (buffer) = timestamp; /* get the offset in RTP time */ GST_BUFFER_OFFSET (buffer) = priv->bytes_to_rtptime (payload, priv->offset); priv->offset += payload_len; /* Set the duration from the size */ GST_BUFFER_DURATION (buffer) = priv->bytes_to_time (payload, payload_len); /* remember the last rtptime/timestamp pair. We will use this to realign our * RTP timestamp after a buffer discont */ priv->last_rtptime = GST_BUFFER_OFFSET (buffer); priv->last_timestamp = timestamp; } /** * gst_rtp_base_audio_payload_push: * @baseaudiopayload: a #GstRTPBasePayload * @data: (array length=payload_len): data to set as payload * @payload_len: length of payload * @timestamp: a #GstClockTime * * Create an RTP buffer and store @payload_len bytes of @data as the * payload. Set the timestamp on the new buffer to @timestamp before pushing * the buffer downstream. * * Returns: a #GstFlowReturn */ GstFlowReturn gst_rtp_base_audio_payload_push (GstRTPBaseAudioPayload * baseaudiopayload, const guint8 * data, guint payload_len, GstClockTime timestamp) { GstRTPBasePayload *basepayload; GstBuffer *outbuf; guint8 *payload; GstFlowReturn ret; GstRTPBuffer rtp = { NULL }; basepayload = GST_RTP_BASE_PAYLOAD (baseaudiopayload); GST_DEBUG_OBJECT (baseaudiopayload, "Pushing %d bytes ts %" GST_TIME_FORMAT, payload_len, GST_TIME_ARGS (timestamp)); /* create buffer to hold the payload */ outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0); /* copy payload */ gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp); payload = gst_rtp_buffer_get_payload (&rtp); memcpy (payload, data, payload_len); gst_rtp_buffer_unmap (&rtp); /* set metadata */ gst_rtp_base_audio_payload_set_meta (baseaudiopayload, outbuf, payload_len, timestamp); ret = gst_rtp_base_payload_push (basepayload, outbuf); return ret; } typedef struct { GstRTPBaseAudioPayload *pay; GstBuffer *outbuf; } CopyMetaData; static gboolean foreach_metadata (GstBuffer * inbuf, GstMeta ** meta, gpointer user_data) { CopyMetaData *data = user_data; GstRTPBaseAudioPayload *pay = data->pay; GstBuffer *outbuf = data->outbuf; const GstMetaInfo *info = (*meta)->info; const gchar *const *tags = gst_meta_api_type_get_tags (info->api); if (info->transform_func && (!tags || (g_strv_length ((gchar **) tags) == 1 && gst_meta_api_type_has_tag (info->api, g_quark_from_string (GST_META_TAG_AUDIO_STR))))) { GstMetaTransformCopy copy_data = { FALSE, 0, -1 }; GST_DEBUG_OBJECT (pay, "copy metadata %s", g_type_name (info->api)); /* simply copy then */ info->transform_func (outbuf, *meta, inbuf, _gst_meta_transform_copy, ©_data); } else { GST_DEBUG_OBJECT (pay, "not copying metadata %s", g_type_name (info->api)); } return TRUE; } static GstFlowReturn gst_rtp_base_audio_payload_push_buffer (GstRTPBaseAudioPayload * baseaudiopayload, GstBuffer * buffer, GstClockTime timestamp) { GstRTPBasePayload *basepayload; GstRTPBaseAudioPayloadPrivate *priv; GstBuffer *outbuf; guint payload_len; GstFlowReturn ret; priv = baseaudiopayload->priv; basepayload = GST_RTP_BASE_PAYLOAD (baseaudiopayload); payload_len = gst_buffer_get_size (buffer); GST_DEBUG_OBJECT (baseaudiopayload, "Pushing %d bytes ts %" GST_TIME_FORMAT, payload_len, GST_TIME_ARGS (timestamp)); /* create just the RTP header buffer */ outbuf = gst_rtp_buffer_new_allocate (0, 0, 0); /* set metadata */ gst_rtp_base_audio_payload_set_meta (baseaudiopayload, outbuf, payload_len, timestamp); if (priv->buffer_list) { GstBufferList *list; guint i, len; list = gst_buffer_list_new (); len = gst_buffer_list_length (list); for (i = 0; i < len; i++) { /* FIXME */ g_warning ("bufferlist not implemented"); gst_buffer_list_add (list, outbuf); gst_buffer_list_add (list, buffer); } GST_DEBUG_OBJECT (baseaudiopayload, "Pushing list %p", list); ret = gst_rtp_base_payload_push_list (basepayload, list); } else { CopyMetaData data; /* copy payload */ data.pay = baseaudiopayload; data.outbuf = outbuf; gst_buffer_foreach_meta (buffer, foreach_metadata, &data); outbuf = gst_buffer_append (outbuf, buffer); GST_DEBUG_OBJECT (baseaudiopayload, "Pushing buffer %p", outbuf); ret = gst_rtp_base_payload_push (basepayload, outbuf); } return ret; } /** * gst_rtp_base_audio_payload_flush: * @baseaudiopayload: a #GstRTPBasePayload * @payload_len: length of payload * @timestamp: a #GstClockTime * * Create an RTP buffer and store @payload_len bytes of the adapter as the * payload. Set the timestamp on the new buffer to @timestamp before pushing * the buffer downstream. * * If @payload_len is -1, all pending bytes will be flushed. If @timestamp is * -1, the timestamp will be calculated automatically. * * Returns: a #GstFlowReturn */ GstFlowReturn gst_rtp_base_audio_payload_flush (GstRTPBaseAudioPayload * baseaudiopayload, guint payload_len, GstClockTime timestamp) { GstRTPBasePayload *basepayload; GstRTPBaseAudioPayloadPrivate *priv; GstBuffer *outbuf; GstFlowReturn ret; GstAdapter *adapter; guint64 distance; priv = baseaudiopayload->priv; adapter = priv->adapter; basepayload = GST_RTP_BASE_PAYLOAD (baseaudiopayload); if (payload_len == -1) payload_len = gst_adapter_available (adapter); /* nothing to do, just return */ if (payload_len == 0) return GST_FLOW_OK; if (timestamp == -1) { /* calculate the timestamp */ timestamp = gst_adapter_prev_pts (adapter, &distance); GST_LOG_OBJECT (baseaudiopayload, "last timestamp %" GST_TIME_FORMAT ", distance %" G_GUINT64_FORMAT, GST_TIME_ARGS (timestamp), distance); if (GST_CLOCK_TIME_IS_VALID (timestamp) && distance > 0) { /* convert the number of bytes since the last timestamp to time and add to * the last seen timestamp */ timestamp += priv->bytes_to_time (baseaudiopayload, distance); } } GST_DEBUG_OBJECT (baseaudiopayload, "Pushing %d bytes ts %" GST_TIME_FORMAT, payload_len, GST_TIME_ARGS (timestamp)); if (priv->buffer_list && gst_adapter_available_fast (adapter) >= payload_len) { GstBuffer *buffer; /* we can quickly take a buffer out of the adapter without having to copy * anything. */ buffer = gst_adapter_take_buffer (adapter, payload_len); ret = gst_rtp_base_audio_payload_push_buffer (baseaudiopayload, buffer, timestamp); } else { GstBuffer *paybuf; CopyMetaData data; /* create buffer to hold the payload */ outbuf = gst_rtp_buffer_new_allocate (0, 0, 0); paybuf = gst_adapter_take_buffer_fast (adapter, payload_len); data.pay = baseaudiopayload; data.outbuf = outbuf; gst_buffer_foreach_meta (paybuf, foreach_metadata, &data); outbuf = gst_buffer_append (outbuf, paybuf); /* set metadata */ gst_rtp_base_audio_payload_set_meta (baseaudiopayload, outbuf, payload_len, timestamp); ret = gst_rtp_base_payload_push (basepayload, outbuf); } return ret; } #define ALIGN_DOWN(val,len) ((val) - ((val) % (len))) /* calculate the min and max length of a packet. This depends on the configured * mtu and min/max_ptime values. We cache those so that we don't have to redo * all the calculations */ static gboolean gst_rtp_base_audio_payload_get_lengths (GstRTPBasePayload * basepayload, guint * min_payload_len, guint * max_payload_len, guint * align) { GstRTPBaseAudioPayload *payload; GstRTPBaseAudioPayloadPrivate *priv; guint max_mtu, mtu; guint maxptime_octets; guint minptime_octets; guint ptime_mult_octets; payload = GST_RTP_BASE_AUDIO_PAYLOAD_CAST (basepayload); priv = payload->priv; if (priv->align == 0) return FALSE; mtu = GST_RTP_BASE_PAYLOAD_MTU (payload); /* check cached values */ if (G_LIKELY (priv->cached_mtu == mtu && priv->cached_ptime_multiple == basepayload->ptime_multiple && priv->cached_ptime == basepayload->ptime && priv->cached_max_ptime == basepayload->max_ptime && priv->cached_min_ptime == basepayload->min_ptime)) { /* if nothing changed, return cached values */ *min_payload_len = priv->cached_min_length; *max_payload_len = priv->cached_max_length; *align = priv->cached_align; return TRUE; } ptime_mult_octets = priv->time_to_bytes (payload, basepayload->ptime_multiple); *align = ALIGN_DOWN (MAX (priv->align, ptime_mult_octets), priv->align); /* ptime max */ if (basepayload->max_ptime != -1) { maxptime_octets = priv->time_to_bytes (payload, basepayload->max_ptime); } else { maxptime_octets = G_MAXUINT; } /* MTU max */ max_mtu = gst_rtp_buffer_calc_payload_len (mtu, 0, 0); /* round down to alignment */ max_mtu = ALIGN_DOWN (max_mtu, *align); /* combine max ptime and max payload length */ *max_payload_len = MIN (max_mtu, maxptime_octets); /* min number of bytes based on a given ptime */ minptime_octets = priv->time_to_bytes (payload, basepayload->min_ptime); /* must be at least one frame size */ *min_payload_len = MAX (minptime_octets, *align); if (*min_payload_len > *max_payload_len) *min_payload_len = *max_payload_len; /* If the ptime is specified in the caps, tried to adhere to it exactly */ if (basepayload->ptime) { guint ptime_in_bytes = priv->time_to_bytes (payload, basepayload->ptime); /* clip to computed min and max lengths */ ptime_in_bytes = MAX (*min_payload_len, ptime_in_bytes); ptime_in_bytes = MIN (*max_payload_len, ptime_in_bytes); *min_payload_len = *max_payload_len = ptime_in_bytes; } /* cache values */ priv->cached_mtu = mtu; priv->cached_ptime = basepayload->ptime; priv->cached_min_ptime = basepayload->min_ptime; priv->cached_max_ptime = basepayload->max_ptime; priv->cached_ptime_multiple = basepayload->ptime_multiple; priv->cached_min_length = *min_payload_len; priv->cached_max_length = *max_payload_len; priv->cached_align = *align; return TRUE; } /* frame conversions functions */ static GstClockTime gst_rtp_base_audio_payload_frame_bytes_to_time (GstRTPBaseAudioPayload * payload, guint64 bytes) { guint64 framecount; framecount = bytes / payload->frame_size; if (G_UNLIKELY (bytes % payload->frame_size)) framecount++; return framecount * payload->priv->frame_duration_ns; } static guint32 gst_rtp_base_audio_payload_frame_bytes_to_rtptime (GstRTPBaseAudioPayload * payload, guint64 bytes) { guint64 framecount; guint64 time; framecount = bytes / payload->frame_size; if (G_UNLIKELY (bytes % payload->frame_size)) framecount++; time = framecount * payload->priv->frame_duration_ns; return gst_util_uint64_scale_int (time, GST_RTP_BASE_PAYLOAD (payload)->clock_rate, GST_SECOND); } static guint64 gst_rtp_base_audio_payload_frame_time_to_bytes (GstRTPBaseAudioPayload * payload, GstClockTime time) { return gst_util_uint64_scale (time, payload->frame_size, payload->priv->frame_duration_ns); } /* sample conversion functions */ static GstClockTime gst_rtp_base_audio_payload_sample_bytes_to_time (GstRTPBaseAudioPayload * payload, guint64 bytes) { guint64 rtptime; /* avoid division when we can */ if (G_LIKELY (payload->sample_size != 8)) rtptime = gst_util_uint64_scale_int (bytes, 8, payload->sample_size); else rtptime = bytes; return gst_util_uint64_scale_int (rtptime, GST_SECOND, GST_RTP_BASE_PAYLOAD (payload)->clock_rate); } static guint32 gst_rtp_base_audio_payload_sample_bytes_to_rtptime (GstRTPBaseAudioPayload * payload, guint64 bytes) { /* avoid division when we can */ if (G_LIKELY (payload->sample_size != 8)) return gst_util_uint64_scale_int (bytes, 8, payload->sample_size); else return bytes; } static guint64 gst_rtp_base_audio_payload_sample_time_to_bytes (GstRTPBaseAudioPayload * payload, guint64 time) { guint64 samples; samples = gst_util_uint64_scale_int (time, GST_RTP_BASE_PAYLOAD (payload)->clock_rate, GST_SECOND); /* avoid multiplication when we can */ if (G_LIKELY (payload->sample_size != 8)) return gst_util_uint64_scale_int (samples, payload->sample_size, 8); else return samples; } static GstFlowReturn gst_rtp_base_audio_payload_handle_buffer (GstRTPBasePayload * basepayload, GstBuffer * buffer) { GstRTPBaseAudioPayload *payload; GstRTPBaseAudioPayloadPrivate *priv; guint payload_len; GstFlowReturn ret; guint available; guint min_payload_len; guint max_payload_len; guint align; guint size; gboolean discont; GstClockTime timestamp; ret = GST_FLOW_OK; payload = GST_RTP_BASE_AUDIO_PAYLOAD_CAST (basepayload); priv = payload->priv; timestamp = GST_BUFFER_PTS (buffer); discont = GST_BUFFER_IS_DISCONT (buffer); if (discont) { GST_DEBUG_OBJECT (payload, "Got DISCONT"); /* flush everything out of the adapter, mark DISCONT */ ret = gst_rtp_base_audio_payload_flush (payload, -1, -1); priv->discont = TRUE; /* get the distance between the timestamp gap and produce the same gap in * the RTP timestamps */ if (priv->last_timestamp != -1 && timestamp != -1) { /* we had a last timestamp, compare it to the new timestamp and update the * offset counter for RTP timestamps. The effect is that we will produce * output buffers containing the same RTP timestamp gap as the gap * between the GST timestamps. */ if (timestamp > priv->last_timestamp) { GstClockTime diff; guint64 bytes; /* we're only going to apply a positive gap, otherwise we let the marker * bit do its thing. simply convert to bytes and add the current * offset */ diff = timestamp - priv->last_timestamp; bytes = priv->time_to_bytes (payload, diff); priv->offset += bytes; GST_DEBUG_OBJECT (payload, "elapsed time %" GST_TIME_FORMAT ", bytes %" G_GUINT64_FORMAT ", new offset %" G_GUINT64_FORMAT, GST_TIME_ARGS (diff), bytes, priv->offset); } } } if (!gst_rtp_base_audio_payload_get_lengths (basepayload, &min_payload_len, &max_payload_len, &align)) goto config_error; GST_DEBUG_OBJECT (payload, "Calculated min_payload_len %u and max_payload_len %u", min_payload_len, max_payload_len); size = gst_buffer_get_size (buffer); /* shortcut, we don't need to use the adapter when the packet can be pushed * through directly. */ available = gst_adapter_available (priv->adapter); GST_DEBUG_OBJECT (payload, "got buffer size %u, available %u", size, available); if (available == 0 && (size >= min_payload_len && size <= max_payload_len) && (size % align == 0)) { /* If buffer fits on an RTP packet, let's just push it through * this will check against max_ptime and max_mtu */ GST_DEBUG_OBJECT (payload, "Fast packet push"); ret = gst_rtp_base_audio_payload_push_buffer (payload, buffer, timestamp); } else { /* push the buffer in the adapter */ gst_adapter_push (priv->adapter, buffer); available += size; GST_DEBUG_OBJECT (payload, "available now %u", available); /* as long as we have full frames */ /* TODO: Use buffer lists here */ while (available >= min_payload_len) { /* get multiple of alignment */ payload_len = MIN (max_payload_len, available); payload_len = ALIGN_DOWN (payload_len, align); /* and flush out the bytes from the adapter, automatically set the * timestamp. */ ret = gst_rtp_base_audio_payload_flush (payload, payload_len, -1); available -= payload_len; GST_DEBUG_OBJECT (payload, "available after push %u", available); } } return ret; /* ERRORS */ config_error: { GST_ELEMENT_ERROR (payload, STREAM, NOT_IMPLEMENTED, (NULL), ("subclass did not configure us properly")); gst_buffer_unref (buffer); return GST_FLOW_ERROR; } } static GstStateChangeReturn gst_rtp_base_payload_audio_change_state (GstElement * element, GstStateChange transition) { GstRTPBaseAudioPayload *rtpbasepayload; GstStateChangeReturn ret; rtpbasepayload = GST_RTP_BASE_AUDIO_PAYLOAD (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: rtpbasepayload->priv->cached_mtu = -1; rtpbasepayload->priv->last_rtptime = -1; rtpbasepayload->priv->last_timestamp = -1; break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_adapter_clear (rtpbasepayload->priv->adapter); break; default: break; } return ret; } static gboolean gst_rtp_base_payload_audio_sink_event (GstRTPBasePayload * basep, GstEvent * event) { GstRTPBaseAudioPayload *payload; gboolean res = FALSE; payload = GST_RTP_BASE_AUDIO_PAYLOAD (basep); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS: /* flush remaining bytes in the adapter */ gst_rtp_base_audio_payload_flush (payload, -1, -1); break; case GST_EVENT_FLUSH_STOP: gst_adapter_clear (payload->priv->adapter); break; default: break; } /* let parent handle the remainder of the event */ res = GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (basep, event); return res; } /** * gst_rtp_base_audio_payload_get_adapter: * @rtpbaseaudiopayload: a #GstRTPBaseAudioPayload * * Gets the internal adapter used by the depayloader. * * Returns: (transfer full): a #GstAdapter. */ GstAdapter * gst_rtp_base_audio_payload_get_adapter (GstRTPBaseAudioPayload * rtpbaseaudiopayload) { GstAdapter *adapter; if ((adapter = rtpbaseaudiopayload->priv->adapter)) g_object_ref (adapter); return adapter; }