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377 lines
12 KiB
C
377 lines
12 KiB
C
/* GStreamer
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*
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* Copyright 2007 Nokia Corporation
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* Copyright 2007 Collabora Ltd,
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* @author: Philippe Kalaf <philippe.kalaf@collabora.co.uk>
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*
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* Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.com>
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* <2007> Edward Hervey <bilboed@bilboed.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 details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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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 "gstrtph263depay.h"
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GST_DEBUG_CATEGORY_STATIC (rtph263depay_debug);
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#define GST_CAT_DEFAULT (rtph263depay_debug)
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#define GST_RFC2190A_HEADER_LEN 4
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#define GST_RFC2190B_HEADER_LEN 8
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#define GST_RFC2190C_HEADER_LEN 12
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static GstStaticPadTemplate gst_rtp_h263_depay_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 ("video/x-h263, "
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"variant = (string) \"itu\", " "h263version = (string) \"h263\"")
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);
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static GstStaticPadTemplate gst_rtp_h263_depay_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 ("application/x-rtp, "
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"media = (string) \"video\", "
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"payload = (int) " GST_RTP_PAYLOAD_H263_STRING ", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"H263\"; "
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"application/x-rtp, "
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"media = (string) \"video\", "
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"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"H263\"")
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);
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#define gst_rtp_h263_depay_parent_class parent_class
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G_DEFINE_TYPE (GstRtpH263Depay, gst_rtp_h263_depay,
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GST_TYPE_RTP_BASE_DEPAYLOAD);
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static void gst_rtp_h263_depay_finalize (GObject * object);
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static GstStateChangeReturn gst_rtp_h263_depay_change_state (GstElement *
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element, GstStateChange transition);
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static GstBuffer *gst_rtp_h263_depay_process (GstRTPBaseDepayload * depayload,
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GstBuffer * buf);
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gboolean gst_rtp_h263_depay_setcaps (GstRTPBaseDepayload * filter,
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GstCaps * caps);
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static void
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gst_rtp_h263_depay_class_init (GstRtpH263DepayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
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GST_DEBUG_CATEGORY_INIT (rtph263depay_debug, "rtph263depay", 0,
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"H263 Video RTP Depayloader");
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
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gobject_class->finalize = gst_rtp_h263_depay_finalize;
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gstelement_class->change_state = gst_rtp_h263_depay_change_state;
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_rtp_h263_depay_src_template));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_rtp_h263_depay_sink_template));
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP H263 depayloader", "Codec/Depayloader/Network/RTP",
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"Extracts H263 video from RTP packets (RFC 2190)",
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"Philippe Kalaf <philippe.kalaf@collabora.co.uk>, "
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"Edward Hervey <bilboed@bilboed.com>");
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gstrtpbasedepayload_class->process = gst_rtp_h263_depay_process;
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gstrtpbasedepayload_class->set_caps = gst_rtp_h263_depay_setcaps;
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}
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static void
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gst_rtp_h263_depay_init (GstRtpH263Depay * rtph263depay)
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{
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rtph263depay->adapter = gst_adapter_new ();
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rtph263depay->offset = 0;
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rtph263depay->leftover = 0;
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}
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static void
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gst_rtp_h263_depay_finalize (GObject * object)
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{
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GstRtpH263Depay *rtph263depay;
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rtph263depay = GST_RTP_H263_DEPAY (object);
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g_object_unref (rtph263depay->adapter);
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rtph263depay->adapter = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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gboolean
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gst_rtp_h263_depay_setcaps (GstRTPBaseDepayload * filter, GstCaps * caps)
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{
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GstCaps *srccaps;
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GstStructure *structure = gst_caps_get_structure (caps, 0);
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gint clock_rate;
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if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
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clock_rate = 90000; /* default */
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filter->clock_rate = clock_rate;
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srccaps = gst_caps_new_simple ("video/x-h263",
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"variant", G_TYPE_STRING, "itu",
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"h263version", G_TYPE_STRING, "h263", NULL);
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gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (filter), srccaps);
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gst_caps_unref (srccaps);
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return TRUE;
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}
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static GstBuffer *
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gst_rtp_h263_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
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{
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GstRtpH263Depay *rtph263depay;
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GstBuffer *outbuf;
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gint payload_len;
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guint8 *payload;
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guint header_len;
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guint SBIT, EBIT;
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gboolean F, P, M;
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gboolean I;
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GstRTPBuffer rtp = { NULL };
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rtph263depay = GST_RTP_H263_DEPAY (depayload);
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/* flush remaining data on discont */
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if (GST_BUFFER_IS_DISCONT (buf)) {
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GST_LOG_OBJECT (depayload, "Discont buffer, flushing adapter");
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gst_adapter_clear (rtph263depay->adapter);
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rtph263depay->offset = 0;
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rtph263depay->leftover = 0;
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rtph263depay->start = FALSE;
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}
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gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
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payload_len = gst_rtp_buffer_get_payload_len (&rtp);
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payload = gst_rtp_buffer_get_payload (&rtp);
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M = gst_rtp_buffer_get_marker (&rtp);
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/* Let's see what mode we are using */
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F = (payload[0] & 0x80) == 0x80;
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P = (payload[0] & 0x40) == 0x40;
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/* Bit shifting */
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SBIT = (payload[0] & 0x38) >> 3;
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EBIT = (payload[0] & 0x07);
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/* Figure out header length and I-flag */
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if (F == 0) {
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/* F == 0 and P == 0 or 1
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* mode A */
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header_len = GST_RFC2190A_HEADER_LEN;
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GST_LOG ("Mode A");
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/* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |F|P|SBIT |EBIT | SRC |I|U|S|A|R |DBQ| TRB | TR |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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I = (payload[1] & 0x10) == 0x10;
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} else {
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if (P == 0) {
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/* F == 1 and P == 0
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* mode B */
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header_len = GST_RFC2190B_HEADER_LEN;
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GST_LOG ("Mode B");
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/* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |F|P|SBIT |EBIT | SRC | QUANT | GOBN | MBA |R |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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I = (payload[4] & 0x80) == 0x80;
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} else {
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/* F == 1 and P == 1
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* mode C */
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header_len = GST_RFC2190C_HEADER_LEN;
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GST_LOG ("Mode C");
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/* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |F|P|SBIT |EBIT | SRC | QUANT | GOBN | MBA |R |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | RR |DBQ| TRB | TR |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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I = (payload[4] & 0x80) == 0x80;
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}
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}
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GST_LOG ("F/P/M/I : %d/%d/%d/%d", F, P, M, I);
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GST_LOG ("SBIT : %d , EBIT : %d", SBIT, EBIT);
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GST_LOG ("payload_len : %d, header_len : %d , leftover : 0x%x",
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payload_len, header_len, rtph263depay->leftover);
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/* skip header */
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payload += header_len;
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payload_len -= header_len;
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if (!rtph263depay->start) {
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/* do not skip this fragment if it is a Mode A with picture start code */
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if (!F && payload_len > 4 && (GST_READ_UINT32_BE (payload) >> 10 == 0x20)) {
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GST_DEBUG ("Mode A with PSC => frame start");
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rtph263depay->start = TRUE;
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if (! !(payload[4] & 0x02) != I) {
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GST_DEBUG ("Wrong Picture Coding Type Flag in rtp header");
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I = !I;
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}
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rtph263depay->psc_I = I;
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} else {
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GST_DEBUG ("no frame start yet, skipping payload");
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goto skip;
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}
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}
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/* only trust I info from Mode A starting packet
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* from buggy payloaders or hw */
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I = rtph263depay->psc_I;
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if (SBIT) {
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/* take the leftover and merge it at the beginning, FIXME make the buffer
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* data writable. */
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GST_LOG ("payload[0] : 0x%x", payload[0]);
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payload[0] &= 0xFF >> SBIT;
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GST_LOG ("payload[0] : 0x%x", payload[0]);
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payload[0] |= rtph263depay->leftover;
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GST_LOG ("payload[0] : 0x%x", payload[0]);
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rtph263depay->leftover = 0;
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rtph263depay->offset = 0;
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}
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if (!EBIT) {
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GstBuffer *tmp;
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/* Take the entire buffer */
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tmp = gst_rtp_buffer_get_payload_subbuffer (&rtp, header_len, payload_len);
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gst_adapter_push (rtph263depay->adapter, tmp);
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} else {
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GstBuffer *tmp;
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/* Take the entire buffer except for the last byte */
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tmp = gst_rtp_buffer_get_payload_subbuffer (&rtp, header_len,
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payload_len - 1);
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gst_adapter_push (rtph263depay->adapter, tmp);
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/* Put the last byte into the leftover */
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GST_DEBUG ("payload[payload_len - 1] : 0x%x", payload[payload_len - 1]);
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GST_DEBUG ("mask : 0x%x", 0xFF << EBIT);
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rtph263depay->leftover = (payload[payload_len - 1] >> EBIT) << EBIT;
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rtph263depay->offset = 1;
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GST_DEBUG ("leftover : 0x%x", rtph263depay->leftover);
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}
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skip:
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if (M) {
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if (rtph263depay->start) {
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/* frame is completed */
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guint avail;
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if (rtph263depay->offset) {
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/* push in the leftover */
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GstBuffer *buf = gst_buffer_new_and_alloc (1);
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GST_DEBUG ("Pushing leftover in adapter");
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gst_buffer_fill (buf, 0, &rtph263depay->leftover, 1);
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gst_adapter_push (rtph263depay->adapter, buf);
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}
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avail = gst_adapter_available (rtph263depay->adapter);
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outbuf = gst_adapter_take_buffer (rtph263depay->adapter, avail);
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if (I)
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GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
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GST_DEBUG ("Pushing out a buffer of %d bytes", avail);
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gst_rtp_base_depayload_push (depayload, outbuf);
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rtph263depay->offset = 0;
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rtph263depay->leftover = 0;
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rtph263depay->start = FALSE;
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} else {
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rtph263depay->start = TRUE;
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}
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}
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gst_rtp_buffer_unmap (&rtp);
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return NULL;
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}
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static GstStateChangeReturn
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gst_rtp_h263_depay_change_state (GstElement * element,
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GstStateChange transition)
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{
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GstRtpH263Depay *rtph263depay;
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GstStateChangeReturn ret;
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rtph263depay = GST_RTP_H263_DEPAY (element);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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gst_adapter_clear (rtph263depay->adapter);
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rtph263depay->start = TRUE;
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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return ret;
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}
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gboolean
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gst_rtp_h263_depay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtph263depay",
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GST_RANK_SECONDARY, GST_TYPE_RTP_H263_DEPAY);
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}
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