/* * * BlueZ - Bluetooth protocol stack for Linux * * Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org> * * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "gstrtpsbcpay.h" #include <math.h> #include <string.h> #define RTP_SBC_PAYLOAD_HEADER_SIZE 1 #define DEFAULT_MIN_FRAMES 0 #define RTP_SBC_HEADER_TOTAL (12 + RTP_SBC_PAYLOAD_HEADER_SIZE) #if __BYTE_ORDER == __LITTLE_ENDIAN struct rtp_payload { guint8 frame_count:4; guint8 rfa0:1; guint8 is_last_fragment:1; guint8 is_first_fragment:1; guint8 is_fragmented:1; } __attribute__ ((packed)); #elif __BYTE_ORDER == __BIG_ENDIAN struct rtp_payload { guint8 is_fragmented:1; guint8 is_first_fragment:1; guint8 is_last_fragment:1; guint8 rfa0:1; guint8 frame_count:4; } __attribute__ ((packed)); #else #error "Unknown byte order" #endif enum { PROP_0, PROP_MIN_FRAMES }; GST_DEBUG_CATEGORY_STATIC(gst_rtp_sbc_pay_debug); #define GST_CAT_DEFAULT gst_rtp_sbc_pay_debug GST_BOILERPLATE(GstRtpSBCPay, gst_rtp_sbc_pay, GstBaseRTPPayload, GST_TYPE_BASE_RTP_PAYLOAD); static const GstElementDetails gst_rtp_sbc_pay_details = GST_ELEMENT_DETAILS("RTP packet payloader", "Codec/Payloader/Network", "Payload SBC audio as RTP packets", "Thiago Sousa Santos " "<thiagoss@lcc.ufcg.edu.br>"); static GstStaticPadTemplate gst_rtp_sbc_pay_sink_factory = GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS("audio/x-sbc, " "rate = (int) { 16000, 32000, 44100, 48000 }, " "channels = (int) [ 1, 2 ], " "mode = (string) { \"mono\", \"dual\", \"stereo\", \"joint\" }, " "blocks = (int) { 4, 8, 12, 16 }, " "subbands = (int) { 4, 8 }, " "allocation = (string) { \"snr\", \"loudness\" }, " "bitpool = (int) [ 2, 64 ]") ); static GstStaticPadTemplate gst_rtp_sbc_pay_src_factory = GST_STATIC_PAD_TEMPLATE("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS( "application/x-rtp, " "media = (string) \"audio\"," "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) { 16000, 32000, 44100, 48000 }," "encoding-name = (string) \"SBC\"") ); static void gst_rtp_sbc_pay_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gst_rtp_sbc_pay_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static gint gst_rtp_sbc_pay_get_frame_len(gint subbands, gint channels, gint blocks, gint bitpool, const gchar *channel_mode) { gint len; gint join; len = 4 + (4 * subbands * channels)/8; if (strcmp(channel_mode, "mono") == 0 || strcmp(channel_mode, "dual") == 0) len += ((blocks * channels * bitpool) + 7) / 8; else { join = strcmp(channel_mode, "joint") == 0 ? 1 : 0; len += ((join * subbands + blocks * bitpool) + 7) / 8; } return len; } static gboolean gst_rtp_sbc_pay_set_caps(GstBaseRTPPayload *payload, GstCaps *caps) { GstRtpSBCPay *sbcpay; gint rate, subbands, channels, blocks, bitpool; gint frame_len; const gchar *channel_mode; GstStructure *structure; sbcpay = GST_RTP_SBC_PAY(payload); structure = gst_caps_get_structure(caps, 0); if (!gst_structure_get_int(structure, "rate", &rate)) return FALSE; if (!gst_structure_get_int(structure, "channels", &channels)) return FALSE; if (!gst_structure_get_int(structure, "blocks", &blocks)) return FALSE; if (!gst_structure_get_int(structure, "bitpool", &bitpool)) return FALSE; if (!gst_structure_get_int(structure, "subbands", &subbands)) return FALSE; channel_mode = gst_structure_get_string(structure, "mode"); if (!channel_mode) return FALSE; frame_len = gst_rtp_sbc_pay_get_frame_len(subbands, channels, blocks, bitpool, channel_mode); sbcpay->frame_length = frame_len; gst_basertppayload_set_options(payload, "audio", TRUE, "SBC", rate); GST_DEBUG_OBJECT(payload, "calculated frame length: %d ", frame_len); return gst_basertppayload_set_outcaps(payload, NULL); } static GstFlowReturn gst_rtp_sbc_pay_flush_buffers(GstRtpSBCPay *sbcpay) { guint available; guint max_payload; GstBuffer *outbuf; guint8 *payload_data; guint frame_count; guint payload_length; struct rtp_payload *payload; if (sbcpay->frame_length == 0) { GST_ERROR_OBJECT(sbcpay, "Frame length is 0"); return GST_FLOW_ERROR; } available = gst_adapter_available(sbcpay->adapter); max_payload = gst_rtp_buffer_calc_payload_len( GST_BASE_RTP_PAYLOAD_MTU(sbcpay) - RTP_SBC_PAYLOAD_HEADER_SIZE, 0, 0); max_payload = MIN(max_payload, available); frame_count = max_payload / sbcpay->frame_length; payload_length = frame_count * sbcpay->frame_length; if (payload_length == 0) /* Nothing to send */ return GST_FLOW_OK; outbuf = gst_rtp_buffer_new_allocate(payload_length + RTP_SBC_PAYLOAD_HEADER_SIZE, 0, 0); gst_rtp_buffer_set_payload_type(outbuf, GST_BASE_RTP_PAYLOAD_PT(sbcpay)); payload_data = gst_rtp_buffer_get_payload(outbuf); payload = (struct rtp_payload *) payload_data; memset(payload, 0, sizeof(struct rtp_payload)); payload->frame_count = frame_count; gst_adapter_copy(sbcpay->adapter, payload_data + RTP_SBC_PAYLOAD_HEADER_SIZE, 0, payload_length); gst_adapter_flush(sbcpay->adapter, payload_length); GST_BUFFER_TIMESTAMP(outbuf) = sbcpay->timestamp; GST_DEBUG_OBJECT(sbcpay, "Pushing %d bytes", payload_length); return gst_basertppayload_push(GST_BASE_RTP_PAYLOAD(sbcpay), outbuf); } static GstFlowReturn gst_rtp_sbc_pay_handle_buffer(GstBaseRTPPayload *payload, GstBuffer *buffer) { GstRtpSBCPay *sbcpay; guint available; /* FIXME check for negotiation */ sbcpay = GST_RTP_SBC_PAY(payload); sbcpay->timestamp = GST_BUFFER_TIMESTAMP(buffer); gst_adapter_push(sbcpay->adapter, buffer); available = gst_adapter_available(sbcpay->adapter); if (available + RTP_SBC_HEADER_TOTAL >= GST_BASE_RTP_PAYLOAD_MTU(sbcpay) || (available > (sbcpay->min_frames * sbcpay->frame_length))) return gst_rtp_sbc_pay_flush_buffers(sbcpay); return GST_FLOW_OK; } static gboolean gst_rtp_sbc_pay_handle_event(GstPad *pad, GstEvent *event) { GstRtpSBCPay *sbcpay = GST_RTP_SBC_PAY(GST_PAD_PARENT(pad)); switch (GST_EVENT_TYPE(event)) { case GST_EVENT_EOS: gst_rtp_sbc_pay_flush_buffers(sbcpay); break; default: break; } return FALSE; } static void gst_rtp_sbc_pay_base_init(gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS(g_class); gst_element_class_add_pad_template(element_class, gst_static_pad_template_get(&gst_rtp_sbc_pay_sink_factory)); gst_element_class_add_pad_template(element_class, gst_static_pad_template_get(&gst_rtp_sbc_pay_src_factory)); gst_element_class_set_details(element_class, &gst_rtp_sbc_pay_details); } static void gst_rtp_sbc_pay_finalize(GObject *object) { GstRtpSBCPay *sbcpay = GST_RTP_SBC_PAY(object); g_object_unref(sbcpay->adapter); GST_CALL_PARENT(G_OBJECT_CLASS, finalize, (object)); } static void gst_rtp_sbc_pay_class_init(GstRtpSBCPayClass *klass) { GObjectClass *gobject_class; GstBaseRTPPayloadClass *payload_class = GST_BASE_RTP_PAYLOAD_CLASS(klass); gobject_class = G_OBJECT_CLASS(klass); parent_class = g_type_class_peek_parent(klass); gobject_class->finalize = GST_DEBUG_FUNCPTR(gst_rtp_sbc_pay_finalize); gobject_class->set_property = GST_DEBUG_FUNCPTR( gst_rtp_sbc_pay_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR( gst_rtp_sbc_pay_get_property); payload_class->set_caps = GST_DEBUG_FUNCPTR(gst_rtp_sbc_pay_set_caps); payload_class->handle_buffer = GST_DEBUG_FUNCPTR( gst_rtp_sbc_pay_handle_buffer); payload_class->handle_event = GST_DEBUG_FUNCPTR( gst_rtp_sbc_pay_handle_event); /* properties */ g_object_class_install_property(G_OBJECT_CLASS(klass), PROP_MIN_FRAMES, g_param_spec_int("min-frames", "minimum frame number", "Minimum quantity of frames to send in one packet " "(-1 for maximum allowed by the mtu)", -1, G_MAXINT, DEFAULT_MIN_FRAMES, G_PARAM_READWRITE)); GST_DEBUG_CATEGORY_INIT(gst_rtp_sbc_pay_debug, "rtpsbcpay", 0, "RTP SBC payloader"); } static void gst_rtp_sbc_pay_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GstRtpSBCPay *sbcpay; sbcpay = GST_RTP_SBC_PAY(object); switch (prop_id) { case PROP_MIN_FRAMES: sbcpay->min_frames = g_value_get_int(value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec); break; } } static void gst_rtp_sbc_pay_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GstRtpSBCPay *sbcpay; sbcpay = GST_RTP_SBC_PAY(object); switch (prop_id) { case PROP_MIN_FRAMES: g_value_set_int(value, sbcpay->min_frames); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec); break; } } static void gst_rtp_sbc_pay_init(GstRtpSBCPay *self, GstRtpSBCPayClass *klass) { self->adapter = gst_adapter_new(); self->frame_length = 0; self->timestamp = 0; self->min_frames = DEFAULT_MIN_FRAMES; } gboolean gst_rtp_sbc_pay_plugin_init(GstPlugin *plugin) { return gst_element_register(plugin, "rtpsbcpay", GST_RANK_NONE, GST_TYPE_RTP_SBC_PAY); }