mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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344 lines
9.1 KiB
C
344 lines
9.1 KiB
C
/* GStreamer
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* Copyright (C) <2005> Wim Taymans <wim@fluendo.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <gst/rtp/gstrtpbuffer.h>
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#include "gstrtpmp4venc.h"
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/* elementfactory information */
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static GstElementDetails gst_rtp_mp4venc_details = {
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"RTP packet parser",
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"Codec/Parser/Network",
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"Encode MPEG4 video as RTP packets (RFC 3016)",
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"Wim Taymans <wim@fluendo.com>"
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};
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static GstStaticPadTemplate gst_rtpmp4venc_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/mpeg,"
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"mpegversion=(int) 4," "systemstream=(boolean)false")
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);
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static GstStaticPadTemplate gst_rtpmp4venc_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp, "
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"media = (string) \"video\", "
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"payload = (int) [ 96, 255 ], "
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"clock-rate = (int) [1, MAX ], "
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"encoding-name = (string) \"MP4V-ES\", " "profile-level-id=[1,MAX]"
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/* All optional parameters
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*
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* "config="
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*/
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)
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);
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static void gst_rtpmp4venc_class_init (GstRtpMP4VEncClass * klass);
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static void gst_rtpmp4venc_base_init (GstRtpMP4VEncClass * klass);
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static void gst_rtpmp4venc_init (GstRtpMP4VEnc * rtpmp4venc);
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static void gst_rtpmp4venc_finalize (GObject * object);
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static gboolean gst_rtpmp4venc_setcaps (GstBaseRTPPayload * payload,
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GstCaps * caps);
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static GstFlowReturn gst_rtpmp4venc_handle_buffer (GstBaseRTPPayload * payload,
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GstBuffer * buffer);
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static GstBaseRTPPayloadClass *parent_class = NULL;
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static GType
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gst_rtpmp4venc_get_type (void)
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{
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static GType rtpmp4venc_type = 0;
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if (!rtpmp4venc_type) {
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static const GTypeInfo rtpmp4venc_info = {
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sizeof (GstRtpMP4VEncClass),
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(GBaseInitFunc) gst_rtpmp4venc_base_init,
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NULL,
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(GClassInitFunc) gst_rtpmp4venc_class_init,
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NULL,
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NULL,
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sizeof (GstRtpMP4VEnc),
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0,
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(GInstanceInitFunc) gst_rtpmp4venc_init,
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};
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rtpmp4venc_type =
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g_type_register_static (GST_TYPE_BASE_RTP_PAYLOAD, "GstRtpMP4VEnc",
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&rtpmp4venc_info, 0);
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}
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return rtpmp4venc_type;
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}
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static void
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gst_rtpmp4venc_base_init (GstRtpMP4VEncClass * klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtpmp4venc_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtpmp4venc_sink_template));
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gst_element_class_set_details (element_class, &gst_rtp_mp4venc_details);
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}
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static void
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gst_rtpmp4venc_class_init (GstRtpMP4VEncClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseRTPPayloadClass *gstbasertppayload_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_BASE_RTP_PAYLOAD);
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gobject_class->finalize = gst_rtpmp4venc_finalize;
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gstbasertppayload_class->set_caps = gst_rtpmp4venc_setcaps;
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gstbasertppayload_class->handle_buffer = gst_rtpmp4venc_handle_buffer;
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}
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static void
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gst_rtpmp4venc_init (GstRtpMP4VEnc * rtpmp4venc)
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{
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rtpmp4venc->adapter = gst_adapter_new ();
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rtpmp4venc->rate = 90000;
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rtpmp4venc->profile = 1;
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}
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static void
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gst_rtpmp4venc_finalize (GObject * object)
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{
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GstRtpMP4VEnc *rtpmp4venc;
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rtpmp4venc = GST_RTP_MP4V_ENC (object);
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g_object_unref (rtpmp4venc->adapter);
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rtpmp4venc->adapter = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_rtpmp4venc_new_caps (GstRtpMP4VEnc * rtpmp4venc)
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{
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gst_basertppayload_set_outcaps (GST_BASE_RTP_PAYLOAD (rtpmp4venc),
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"profile-level-id", G_TYPE_INT, rtpmp4venc->profile,
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"config", GST_TYPE_BUFFER, rtpmp4venc->config, NULL);
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}
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static gboolean
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gst_rtpmp4venc_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
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{
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GstRtpMP4VEnc *rtpmp4venc;
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rtpmp4venc = GST_RTP_MP4V_ENC (payload);
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gst_basertppayload_set_options (payload, "video", TRUE, "MP4V-ES",
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rtpmp4venc->rate);
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return TRUE;
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}
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static GstFlowReturn
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gst_rtpmp4venc_flush (GstRtpMP4VEnc * rtpmp4venc)
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{
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guint avail;
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GstBuffer *outbuf;
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GstFlowReturn ret;
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/* the data available in the adapter is either smaller
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* than the MTU or bigger. In the case it is smaller, the complete
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* adapter contents can be put in one packet. In the case the
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* adapter has more than one MTU, we need to split the MP4V data
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* over multiple packets. */
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avail = gst_adapter_available (rtpmp4venc->adapter);
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ret = GST_FLOW_OK;
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while (avail > 0) {
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guint towrite;
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guint8 *payload;
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guint8 *data;
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guint payload_len;
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guint packet_len;
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/* this will be the total lenght of the packet */
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packet_len = gst_rtpbuffer_calc_packet_len (avail, 0, 0);
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/* fill one MTU or all available bytes */
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towrite = MIN (packet_len, GST_BASE_RTP_PAYLOAD_MTU (rtpmp4venc));
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/* this is the payload length */
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payload_len = gst_rtpbuffer_calc_payload_len (towrite, 0, 0);
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/* create buffer to hold the payload */
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outbuf = gst_rtpbuffer_new_allocate (payload_len, 0, 0);
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/* copy payload */
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payload = gst_rtpbuffer_get_payload (outbuf);
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data = (guint8 *) gst_adapter_peek (rtpmp4venc->adapter, payload_len);
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memcpy (payload, data, payload_len);
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gst_adapter_flush (rtpmp4venc->adapter, payload_len);
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avail -= payload_len;
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gst_rtpbuffer_set_marker (outbuf, avail == 0);
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GST_BUFFER_TIMESTAMP (outbuf) = rtpmp4venc->first_ts;
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ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtpmp4venc), outbuf);
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}
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return ret;
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}
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#define VOS_STARTCODE 0x000001B0
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#define VOS_ENDCODE 0x000001B1
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#define USER_DATA_STARTCODE 0x000001B2
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#define GOP_STARTCODE 0x000001B3
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#define VISUAL_OBJECT_STARTCODE 0x000001B5
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#define VOP_STARTCODE 0x000001B6
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static gboolean
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gst_rtpmp4venc_parse_data (GstRtpMP4VEnc * enc, guint8 * data, guint size)
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{
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guint32 code;
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gboolean result;
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if (size < 5)
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return FALSE;
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code = GST_READ_UINT32_BE (data);
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switch (code) {
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case VOS_STARTCODE:
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{
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gint i;
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guint8 profile;
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gboolean newprofile = FALSE;
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gboolean equal;
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/* profile_and_level_indication */
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profile = data[4];
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if (profile != enc->profile) {
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newprofile = TRUE;
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enc->profile = profile;
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}
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/* up to the next GOP_STARTCODE or VOP_STARTCODE is
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* the config information */
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code = 0xffffffff;
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for (i = 5; i < size - 4; i++) {
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code = (code << 8) | data[i];
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if (code == GOP_STARTCODE || code == VOP_STARTCODE)
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break;
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}
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i -= 3;
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/* see if config changed */
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equal = FALSE;
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if (enc->config) {
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if (GST_BUFFER_SIZE (enc->config) == i) {
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equal = memcmp (GST_BUFFER_DATA (enc->config), data, i) == 0;
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}
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}
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/* if config string changed or new profile, make new caps */
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if (!equal || newprofile) {
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if (enc->config)
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gst_buffer_unref (enc->config);
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enc->config = gst_buffer_new_and_alloc (i);
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memcpy (GST_BUFFER_DATA (enc->config), data, i);
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gst_rtpmp4venc_new_caps (enc);
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}
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result = TRUE;
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break;
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}
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case VOP_STARTCODE:
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result = FALSE;
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break;
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default:
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result = TRUE;
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break;
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}
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return result;
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}
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/* we expect buffers starting on startcodes.
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*/
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static GstFlowReturn
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gst_rtpmp4venc_handle_buffer (GstBaseRTPPayload * basepayload,
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GstBuffer * buffer)
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{
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GstRtpMP4VEnc *rtpmp4venc;
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GstFlowReturn ret;
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guint size, avail;
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guint packet_len;
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guint8 *data;
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gboolean flush;
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rtpmp4venc = GST_RTP_MP4V_ENC (basepayload);
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size = GST_BUFFER_SIZE (buffer);
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data = GST_BUFFER_DATA (buffer);
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avail = gst_adapter_available (rtpmp4venc->adapter);
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/* parse incomming data and see if we need to start a new RTP
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* packet */
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flush = gst_rtpmp4venc_parse_data (rtpmp4venc, data, size);
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/* get packet length of previous data and this new data */
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packet_len = gst_rtpbuffer_calc_packet_len (avail + size, 0, 0);
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/* if this buffer is going to overflow the packet, flush what we
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* have. */
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if (flush || packet_len > GST_BASE_RTP_PAYLOAD_MTU (rtpmp4venc)) {
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ret = gst_rtpmp4venc_flush (rtpmp4venc);
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avail = 0;
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}
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gst_adapter_push (rtpmp4venc->adapter, buffer);
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if (avail == 0) {
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rtpmp4venc->first_ts = GST_BUFFER_TIMESTAMP (buffer);
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}
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ret = GST_FLOW_OK;
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return ret;
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}
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gboolean
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gst_rtpmp4venc_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtpmp4venc",
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GST_RANK_NONE, GST_TYPE_RTP_MP4V_ENC);
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}
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