diff options
Diffstat (limited to 'gst/rtp/gstrtpceltpay.c')
| -rw-r--r-- | gst/rtp/gstrtpceltpay.c | 477 |
1 files changed, 477 insertions, 0 deletions
diff --git a/gst/rtp/gstrtpceltpay.c b/gst/rtp/gstrtpceltpay.c new file mode 100644 index 0000000..c727efc --- /dev/null +++ b/gst/rtp/gstrtpceltpay.c @@ -0,0 +1,477 @@ +/* GStreamer + * Copyright (C) <2009> Wim Taymans <wim.taymans@gmail.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <stdlib.h> +#include <string.h> +#include <gst/rtp/gstrtpbuffer.h> + +#include "gstrtpceltpay.h" + +GST_DEBUG_CATEGORY_STATIC (rtpceltpay_debug); +#define GST_CAT_DEFAULT (rtpceltpay_debug) + +static GstStaticPadTemplate gst_rtp_celt_pay_sink_template = +GST_STATIC_PAD_TEMPLATE ("sink", + GST_PAD_SINK, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("audio/x-celt, " + "rate = (int) [ 32000, 64000 ], " + "channels = (int) [1, 2], " "frame-size = (int) [ 64, 512 ]") + ); + +static GstStaticPadTemplate gst_rtp_celt_pay_src_template = +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) [ 32000, 48000 ], " + "encoding-name = (string) \"CELT\"") + ); + +static void gst_rtp_celt_pay_finalize (GObject * object); + +static GstStateChangeReturn gst_rtp_celt_pay_change_state (GstElement * + element, GstStateChange transition); + +static gboolean gst_rtp_celt_pay_setcaps (GstBaseRTPPayload * payload, + GstCaps * caps); +static GstCaps *gst_rtp_celt_pay_getcaps (GstBaseRTPPayload * payload, + GstPad * pad); +static GstFlowReturn gst_rtp_celt_pay_handle_buffer (GstBaseRTPPayload * + payload, GstBuffer * buffer); + +GST_BOILERPLATE (GstRtpCELTPay, gst_rtp_celt_pay, GstBaseRTPPayload, + GST_TYPE_BASE_RTP_PAYLOAD); + +static void +gst_rtp_celt_pay_base_init (gpointer klass) +{ + GstElementClass *element_class = GST_ELEMENT_CLASS (klass); + + gst_element_class_add_static_pad_template (element_class, + &gst_rtp_celt_pay_sink_template); + gst_element_class_add_static_pad_template (element_class, + &gst_rtp_celt_pay_src_template); + gst_element_class_set_details_simple (element_class, "RTP CELT payloader", + "Codec/Payloader/Network/RTP", + "Payload-encodes CELT audio into a RTP packet", + "Wim Taymans <wim.taymans@gmail.com>"); + + GST_DEBUG_CATEGORY_INIT (rtpceltpay_debug, "rtpceltpay", 0, + "CELT RTP Payloader"); +} + +static void +gst_rtp_celt_pay_class_init (GstRtpCELTPayClass * klass) +{ + GObjectClass *gobject_class; + GstElementClass *gstelement_class; + GstBaseRTPPayloadClass *gstbasertppayload_class; + + gobject_class = (GObjectClass *) klass; + gstelement_class = (GstElementClass *) klass; + gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass; + + gobject_class->finalize = gst_rtp_celt_pay_finalize; + + gstelement_class->change_state = gst_rtp_celt_pay_change_state; + + gstbasertppayload_class->set_caps = gst_rtp_celt_pay_setcaps; + gstbasertppayload_class->get_caps = gst_rtp_celt_pay_getcaps; + gstbasertppayload_class->handle_buffer = gst_rtp_celt_pay_handle_buffer; +} + +static void +gst_rtp_celt_pay_init (GstRtpCELTPay * rtpceltpay, GstRtpCELTPayClass * klass) +{ + rtpceltpay->queue = g_queue_new (); +} + +static void +gst_rtp_celt_pay_finalize (GObject * object) +{ + GstRtpCELTPay *rtpceltpay; + + rtpceltpay = GST_RTP_CELT_PAY (object); + + g_queue_free (rtpceltpay->queue); + + G_OBJECT_CLASS (parent_class)->finalize (object); +} + +static void +gst_rtp_celt_pay_clear_queued (GstRtpCELTPay * rtpceltpay) +{ + GstBuffer *buf; + + while ((buf = g_queue_pop_head (rtpceltpay->queue))) + gst_buffer_unref (buf); + + rtpceltpay->bytes = 0; + rtpceltpay->sbytes = 0; + rtpceltpay->qduration = 0; +} + +static void +gst_rtp_celt_pay_add_queued (GstRtpCELTPay * rtpceltpay, GstBuffer * buffer, + guint ssize, guint size, GstClockTime duration) +{ + g_queue_push_tail (rtpceltpay->queue, buffer); + rtpceltpay->sbytes += ssize; + rtpceltpay->bytes += size; + /* only add durations when we have a valid previous duration */ + if (rtpceltpay->qduration != -1) { + if (duration != -1) + /* only add valid durations */ + rtpceltpay->qduration += duration; + else + /* if we add a buffer without valid duration, our total queued duration + * becomes unknown */ + rtpceltpay->qduration = -1; + } +} + +static gboolean +gst_rtp_celt_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps) +{ + /* don't configure yet, we wait for the ident packet */ + return TRUE; +} + + +static GstCaps * +gst_rtp_celt_pay_getcaps (GstBaseRTPPayload * payload, GstPad * pad) +{ + GstCaps *otherpadcaps; + GstCaps *caps; + const gchar *params; + + otherpadcaps = gst_pad_get_allowed_caps (payload->srcpad); + caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad)); + + if (otherpadcaps) { + if (!gst_caps_is_empty (otherpadcaps)) { + GstStructure *ps = gst_caps_get_structure (otherpadcaps, 0); + GstStructure *s = gst_caps_get_structure (caps, 0); + gint clock_rate = 0, frame_size = 0, channels = 1; + + if (gst_structure_get_int (ps, "clock-rate", &clock_rate)) { + gst_structure_fixate_field_nearest_int (s, "rate", clock_rate); + } + + if ((params = gst_structure_get_string (ps, "frame-size"))) + frame_size = atoi (params); + if (frame_size) + gst_structure_set (s, "frame-size", G_TYPE_INT, frame_size, NULL); + + if ((params = gst_structure_get_string (ps, "encoding-params"))) { + channels = atoi (params); + gst_structure_fixate_field_nearest_int (s, "channels", channels); + } + + GST_DEBUG_OBJECT (payload, "clock-rate=%d frame-size=%d channels=%d", + clock_rate, frame_size, channels); + } + gst_caps_unref (otherpadcaps); + } + + return caps; +} + +static gboolean +gst_rtp_celt_pay_parse_ident (GstRtpCELTPay * rtpceltpay, + const guint8 * data, guint size) +{ + guint32 version, header_size, rate, nb_channels, frame_size, overlap; + guint32 bytes_per_packet; + GstBaseRTPPayload *payload; + gchar *cstr, *fsstr; + gboolean res; + + /* we need the header string (8), the version string (20), the version + * and the header length. */ + if (size < 36) + goto too_small; + + if (!g_str_has_prefix ((const gchar *) data, "CELT ")) + goto wrong_header; + + /* skip header and version string */ + data += 28; + + version = GST_READ_UINT32_LE (data); + GST_DEBUG_OBJECT (rtpceltpay, "version %08x", version); +#if 0 + if (version != 1) + goto wrong_version; +#endif + + data += 4; + /* ensure sizes */ + header_size = GST_READ_UINT32_LE (data); + if (header_size < 56) + goto header_too_small; + + if (size < header_size) + goto payload_too_small; + + data += 4; + rate = GST_READ_UINT32_LE (data); + data += 4; + nb_channels = GST_READ_UINT32_LE (data); + data += 4; + frame_size = GST_READ_UINT32_LE (data); + data += 4; + overlap = GST_READ_UINT32_LE (data); + data += 4; + bytes_per_packet = GST_READ_UINT32_LE (data); + + GST_DEBUG_OBJECT (rtpceltpay, "rate %d, nb_channels %d, frame_size %d", + rate, nb_channels, frame_size); + GST_DEBUG_OBJECT (rtpceltpay, "overlap %d, bytes_per_packet %d", + overlap, bytes_per_packet); + + payload = GST_BASE_RTP_PAYLOAD (rtpceltpay); + + gst_basertppayload_set_options (payload, "audio", FALSE, "CELT", rate); + cstr = g_strdup_printf ("%d", nb_channels); + fsstr = g_strdup_printf ("%d", frame_size); + res = gst_basertppayload_set_outcaps (payload, "encoding-params", + G_TYPE_STRING, cstr, "frame-size", G_TYPE_STRING, fsstr, NULL); + g_free (cstr); + g_free (fsstr); + + return res; + + /* ERRORS */ +too_small: + { + GST_DEBUG_OBJECT (rtpceltpay, + "ident packet too small, need at least 32 bytes"); + return FALSE; + } +wrong_header: + { + GST_DEBUG_OBJECT (rtpceltpay, + "ident packet does not start with \"CELT \""); + return FALSE; + } +#if 0 +wrong_version: + { + GST_DEBUG_OBJECT (rtpceltpay, "can only handle version 1, have version %d", + version); + return FALSE; + } +#endif +header_too_small: + { + GST_DEBUG_OBJECT (rtpceltpay, + "header size too small, need at least 80 bytes, " "got only %d", + header_size); + return FALSE; + } +payload_too_small: + { + GST_DEBUG_OBJECT (rtpceltpay, + "payload too small, need at least %d bytes, got only %d", header_size, + size); + return FALSE; + } +} + +static GstFlowReturn +gst_rtp_celt_pay_flush_queued (GstRtpCELTPay * rtpceltpay) +{ + GstFlowReturn ret; + GstBuffer *buf, *outbuf; + guint8 *payload, *spayload; + guint payload_len; + GstClockTime duration; + + payload_len = rtpceltpay->bytes + rtpceltpay->sbytes; + duration = rtpceltpay->qduration; + + GST_DEBUG_OBJECT (rtpceltpay, "flushing out %u, duration %" GST_TIME_FORMAT, + payload_len, GST_TIME_ARGS (rtpceltpay->qduration)); + + /* get a big enough packet for the sizes + payloads */ + outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0); + + GST_BUFFER_DURATION (outbuf) = duration; + + /* point to the payload for size headers and data */ + spayload = gst_rtp_buffer_get_payload (outbuf); + payload = spayload + rtpceltpay->sbytes; + + while ((buf = g_queue_pop_head (rtpceltpay->queue))) { + guint size; + + /* copy first timestamp to output */ + if (GST_BUFFER_TIMESTAMP (outbuf) == -1) + GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf); + + /* write the size to the header */ + size = GST_BUFFER_SIZE (buf); + while (size > 0xff) { + *spayload++ = 0xff; + size -= 0xff; + } + *spayload++ = size; + + size = GST_BUFFER_SIZE (buf); + /* copy payload */ + memcpy (payload, GST_BUFFER_DATA (buf), size); + payload += size; + + gst_buffer_unref (buf); + } + + /* we consumed it all */ + rtpceltpay->bytes = 0; + rtpceltpay->sbytes = 0; + rtpceltpay->qduration = 0; + + ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtpceltpay), outbuf); + + return ret; +} + +static GstFlowReturn +gst_rtp_celt_pay_handle_buffer (GstBaseRTPPayload * basepayload, + GstBuffer * buffer) +{ + GstFlowReturn ret; + GstRtpCELTPay *rtpceltpay; + guint size, payload_len; + guint8 *data; + GstClockTime duration, packet_dur; + guint i, ssize, packet_len; + + rtpceltpay = GST_RTP_CELT_PAY (basepayload); + + ret = GST_FLOW_OK; + + size = GST_BUFFER_SIZE (buffer); + data = GST_BUFFER_DATA (buffer); + + switch (rtpceltpay->packet) { + case 0: + /* ident packet. We need to parse the headers to construct the RTP + * properties. */ + if (!gst_rtp_celt_pay_parse_ident (rtpceltpay, data, size)) + goto parse_error; + + goto done; + case 1: + /* comment packet, we ignore it */ + goto done; + default: + /* other packets go in the payload */ + break; + } + + duration = GST_BUFFER_DURATION (buffer); + + GST_LOG_OBJECT (rtpceltpay, + "got buffer of duration %" GST_TIME_FORMAT ", size %u", + GST_TIME_ARGS (duration), size); + + /* calculate the size of the size field and the payload */ + ssize = 1; + for (i = size; i > 0xff; i -= 0xff) + ssize++; + + GST_DEBUG_OBJECT (rtpceltpay, "bytes for size %u", ssize); + + /* calculate what the new size and duration would be of the packet */ + payload_len = ssize + size + rtpceltpay->bytes + rtpceltpay->sbytes; + if (rtpceltpay->qduration != -1 && duration != -1) + packet_dur = rtpceltpay->qduration + duration; + else + packet_dur = 0; + + packet_len = gst_rtp_buffer_calc_packet_len (payload_len, 0, 0); + + if (gst_basertppayload_is_filled (basepayload, packet_len, packet_dur)) { + /* size or duration would overflow the packet, flush the queued data */ + ret = gst_rtp_celt_pay_flush_queued (rtpceltpay); + } + + /* queue the packet */ + gst_rtp_celt_pay_add_queued (rtpceltpay, buffer, ssize, size, duration); + +done: + rtpceltpay->packet++; + + return ret; + + /* ERRORS */ +parse_error: + { + GST_ELEMENT_ERROR (rtpceltpay, STREAM, DECODE, (NULL), + ("Error parsing first identification packet.")); + return GST_FLOW_ERROR; + } +} + +static GstStateChangeReturn +gst_rtp_celt_pay_change_state (GstElement * element, GstStateChange transition) +{ + GstRtpCELTPay *rtpceltpay; + GstStateChangeReturn ret; + + rtpceltpay = GST_RTP_CELT_PAY (element); + + switch (transition) { + case GST_STATE_CHANGE_NULL_TO_READY: + break; + case GST_STATE_CHANGE_READY_TO_PAUSED: + rtpceltpay->packet = 0; + break; + default: + break; + } + + ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); + + switch (transition) { + case GST_STATE_CHANGE_PAUSED_TO_READY: + gst_rtp_celt_pay_clear_queued (rtpceltpay); + break; + case GST_STATE_CHANGE_READY_TO_NULL: + break; + default: + break; + } + return ret; +} + +gboolean +gst_rtp_celt_pay_plugin_init (GstPlugin * plugin) +{ + return gst_element_register (plugin, "rtpceltpay", + GST_RANK_SECONDARY, GST_TYPE_RTP_CELT_PAY); +} |