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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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Remove the pt restrictions for all the depayloaders that have an encoding-name. We can use this to autoplug decoders. Remove the encoding-name for all the payloaders with a fixed payload type. We now either have an encoding-name or a pt in the sinkpad caps of a depayloader. See https://bugzilla.gnome.org/show_bug.cgi?id=639292
415 lines
12 KiB
C
415 lines
12 KiB
C
/* Farsight
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* Copyright (C) 2006 Marcel Moreaux <marcelm@spacelabs.nl>
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* (C) 2008 Wim Taymans <wim.taymans@gmail.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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/*
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* RTP DV depayloader.
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*
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* Important note for NTSC-users:
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*
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* Because the author uses PAL video, and he does not have proper DV
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* documentation (the DV format specification is not freely available),
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* this code may very well contain PAL-specific assumptions.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <gst/gst.h>
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#include "gstrtpdvdepay.h"
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GST_DEBUG_CATEGORY (rtpdvdepay_debug);
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#define GST_CAT_DEFAULT (rtpdvdepay_debug)
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/* Filter signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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};
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static GstStaticPadTemplate src_factory = 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-dv")
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);
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static GstStaticPadTemplate sink_factory = 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\", \"audio\" },"
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"encoding-name = (string) \"DV\", "
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"clock-rate = (int) 90000,"
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"encode = (string) { \"SD-VCR/525-60\", \"SD-VCR/625-50\", \"HD-VCR/1125-60\","
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"\"HD-VCR/1250-50\", \"SDL-VCR/525-60\", \"SDL-VCR/625-50\","
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"\"306M/525-60\", \"306M/625-50\", \"314M-25/525-60\","
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"\"314M-25/625-50\", \"314M-50/525-60\", \"314M-50/625-50\" }"
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/* optional parameters can't go in the template
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* "audio = (string) { \"bundled\", \"none\" }"
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*/
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)
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);
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static GstStateChangeReturn
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gst_rtp_dv_depay_change_state (GstElement * element, GstStateChange transition);
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static GstBuffer *gst_rtp_dv_depay_process (GstRTPBaseDepayload * base,
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GstBuffer * in);
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static gboolean gst_rtp_dv_depay_setcaps (GstRTPBaseDepayload * depayload,
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GstCaps * caps);
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#define gst_rtp_dv_depay_parent_class parent_class
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G_DEFINE_TYPE (GstRTPDVDepay, gst_rtp_dv_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
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static void
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gst_rtp_dv_depay_class_init (GstRTPDVDepayClass * klass)
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{
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GstElementClass *gstelement_class = (GstElementClass *) klass;
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GstRTPBaseDepayloadClass *gstrtpbasedepayload_class =
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(GstRTPBaseDepayloadClass *) klass;
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GST_DEBUG_CATEGORY_INIT (rtpdvdepay_debug, "rtpdvdepay", 0,
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"DV RTP Depayloader");
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_rtp_dv_depay_change_state);
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&src_factory));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&sink_factory));
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gst_element_class_set_static_metadata (gstelement_class, "RTP DV Depayloader",
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"Codec/Depayloader/Network/RTP",
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"Depayloads DV from RTP packets (RFC 3189)",
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"Marcel Moreaux <marcelm@spacelabs.nl>, Wim Taymans <wim.taymans@gmail.com>");
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gstrtpbasedepayload_class->process =
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GST_DEBUG_FUNCPTR (gst_rtp_dv_depay_process);
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gstrtpbasedepayload_class->set_caps =
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GST_DEBUG_FUNCPTR (gst_rtp_dv_depay_setcaps);
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}
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/* initialize the new element
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* instantiate pads and add them to element
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* set functions
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* initialize structure
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*/
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static void
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gst_rtp_dv_depay_init (GstRTPDVDepay * filter)
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{
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}
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static gboolean
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parse_encode (GstRTPDVDepay * rtpdvdepay, const gchar * encode)
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{
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rtpdvdepay->width = 720;
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if (!strcmp (encode, "314M-25/525-60")) {
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rtpdvdepay->frame_size = 240000;
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rtpdvdepay->height = 480;
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rtpdvdepay->rate_num = 30000;
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rtpdvdepay->rate_denom = 1001;
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} else if (!strcmp (encode, "SD-VCR/525-60")) {
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rtpdvdepay->frame_size = 120000;
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rtpdvdepay->height = 480;
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rtpdvdepay->rate_num = 30000;
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rtpdvdepay->rate_denom = 1001;
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} else if (!strcmp (encode, "314M-50/625-50")) {
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rtpdvdepay->frame_size = 288000;
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rtpdvdepay->height = 576;
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rtpdvdepay->rate_num = 25;
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rtpdvdepay->rate_denom = 1;
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} else if (!strcmp (encode, "SD-VCR/625-50")) {
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rtpdvdepay->frame_size = 144000;
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rtpdvdepay->height = 576;
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rtpdvdepay->rate_num = 25;
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rtpdvdepay->rate_denom = 1;
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} else if (!strcmp (encode, "314M-25/625-50")) {
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rtpdvdepay->frame_size = 144000;
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rtpdvdepay->height = 576;
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rtpdvdepay->rate_num = 25;
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rtpdvdepay->rate_denom = 1;
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} else
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rtpdvdepay->frame_size = -1;
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return rtpdvdepay->frame_size != -1;
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}
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static gboolean
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gst_rtp_dv_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
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{
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GstStructure *structure;
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GstRTPDVDepay *rtpdvdepay;
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GstCaps *srccaps;
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gint clock_rate;
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gboolean systemstream, ret;
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const gchar *encode, *media;
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rtpdvdepay = GST_RTP_DV_DEPAY (depayload);
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structure = gst_caps_get_structure (caps, 0);
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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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depayload->clock_rate = clock_rate;
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/* we really need the encode property to figure out the frame size, it's also
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* required by the spec */
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if (!(encode = gst_structure_get_string (structure, "encode")))
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goto no_encode;
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/* figure out the size of one frame */
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if (!parse_encode (rtpdvdepay, encode))
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goto unknown_encode;
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/* check the media, this tells us that the stream has video or not */
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if (!(media = gst_structure_get_string (structure, "media")))
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goto no_media;
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systemstream = FALSE;
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if (!strcmp (media, "audio")) {
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/* we need a demuxer for audio only */
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systemstream = TRUE;
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} else if (!strcmp (media, "video")) {
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const gchar *audio;
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/* check the optional audio field, if it's present and set to bundled, we
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* are dealing with a system stream. */
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if ((audio = gst_structure_get_string (structure, "audio"))) {
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if (!strcmp (audio, "bundled"))
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systemstream = TRUE;
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}
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}
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/* allocate accumulator */
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rtpdvdepay->acc = gst_buffer_new_and_alloc (rtpdvdepay->frame_size);
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/* Initialize the new accumulator frame.
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* If the previous frame exists, copy that into the accumulator frame.
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* This way, missing packets in the stream won't show up badly. */
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gst_buffer_memset (rtpdvdepay->acc, 0, 0, rtpdvdepay->frame_size);
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srccaps = gst_caps_new_simple ("video/x-dv",
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"systemstream", G_TYPE_BOOLEAN, systemstream,
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"width", G_TYPE_INT, rtpdvdepay->width,
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"height", G_TYPE_INT, rtpdvdepay->height,
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"framerate", GST_TYPE_FRACTION, rtpdvdepay->rate_num,
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rtpdvdepay->rate_denom, NULL);
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ret = gst_pad_set_caps (depayload->srcpad, srccaps);
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gst_caps_unref (srccaps);
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return ret;
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/* ERRORS */
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no_encode:
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{
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GST_ERROR_OBJECT (rtpdvdepay, "required encode property not found in caps");
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return FALSE;
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}
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unknown_encode:
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{
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GST_ERROR_OBJECT (rtpdvdepay, "unknown encode property %s found", encode);
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return FALSE;
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}
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no_media:
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{
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GST_ERROR_OBJECT (rtpdvdepay, "required media property not found in caps");
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return FALSE;
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}
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}
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/* A DV frame consists of a bunch of 80-byte DIF blocks.
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* Each DIF block contains a 3-byte header telling where in the DV frame the
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* DIF block should go. We use this information to calculate its position.
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*/
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static guint
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calculate_difblock_location (guint8 * block)
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{
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gint block_type, dif_sequence, dif_block;
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guint location;
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block_type = block[0] >> 5;
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dif_sequence = block[1] >> 4;
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dif_block = block[2];
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location = dif_sequence * 150;
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switch (block_type) {
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case 0: /* Header block, no offset */
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break;
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case 1: /* Subcode block */
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location += (1 + dif_block);
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break;
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case 2: /* VAUX block */
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location += (3 + dif_block);
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break;
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case 3: /* Audio block */
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location += (6 + dif_block * 16);
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break;
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case 4: /* Video block */
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location += (7 + (dif_block / 15) + dif_block);
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break;
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default: /* Something bogus */
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GST_DEBUG ("UNKNOWN BLOCK");
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location = -1;
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break;
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}
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return location;
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}
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/* Process one RTP packet. Accumulate RTP payload in the proper place in a DV
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* frame, and return that frame if we detect a new frame, or NULL otherwise.
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* We assume a DV frame is 144000 bytes. That should accomodate PAL as well as
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* NTSC.
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*/
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static GstBuffer *
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gst_rtp_dv_depay_process (GstRTPBaseDepayload * base, GstBuffer * in)
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{
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GstBuffer *out = NULL;
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guint8 *payload;
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guint32 rtp_ts;
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guint payload_len, location;
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GstRTPDVDepay *dvdepay = GST_RTP_DV_DEPAY (base);
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gboolean marker;
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GstRTPBuffer rtp = { NULL, };
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gst_rtp_buffer_map (in, GST_MAP_READ, &rtp);
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marker = gst_rtp_buffer_get_marker (&rtp);
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/* Check if the received packet contains (the start of) a new frame, we do
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* this by checking the RTP timestamp. */
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rtp_ts = gst_rtp_buffer_get_timestamp (&rtp);
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/* we cannot copy the packet yet if the marker is set, we will do that below
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* after taking out the data */
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if (dvdepay->prev_ts != -1 && rtp_ts != dvdepay->prev_ts && !marker) {
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/* the timestamp changed */
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GST_DEBUG_OBJECT (dvdepay, "new frame with ts %u, old ts %u", rtp_ts,
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dvdepay->prev_ts);
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/* return copy of accumulator. */
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out = gst_buffer_copy (dvdepay->acc);
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}
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/* Extract the payload */
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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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/* copy all DIF chunks in their place. */
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while (payload_len >= 80) {
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guint offset;
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/* Calculate where in the frame the payload should go */
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location = calculate_difblock_location (payload);
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if (location < 6) {
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/* part of a header, set the flag to mark that we have the header. */
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dvdepay->header_mask |= (1 << location);
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GST_LOG_OBJECT (dvdepay, "got header at location %d, now %02x", location,
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dvdepay->header_mask);
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} else {
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GST_LOG_OBJECT (dvdepay, "got block at location %d", location);
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}
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if (location != -1) {
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/* get the byte offset of the dif block */
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offset = location * 80;
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/* And copy it in, provided the location is sane. */
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if (offset <= dvdepay->frame_size - 80)
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gst_buffer_fill (dvdepay->acc, offset, payload, 80);
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}
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payload += 80;
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payload_len -= 80;
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}
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gst_rtp_buffer_unmap (&rtp);
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if (marker) {
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GST_DEBUG_OBJECT (dvdepay, "marker bit complete frame %u", rtp_ts);
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/* only copy the frame when we have a complete header */
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if (dvdepay->header_mask == 0x3f) {
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/* The marker marks the end of a frame that we need to push. The next frame
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* will change the timestamp but we won't copy the accumulator again because
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* we set the prev_ts to -1. */
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out = gst_buffer_copy (dvdepay->acc);
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} else {
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GST_WARNING_OBJECT (dvdepay, "waiting for frame headers %02x",
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dvdepay->header_mask);
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}
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dvdepay->prev_ts = -1;
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} else {
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/* save last timestamp */
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dvdepay->prev_ts = rtp_ts;
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}
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return out;
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}
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static void
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gst_rtp_dv_depay_reset (GstRTPDVDepay * depay)
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{
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if (depay->acc)
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gst_buffer_unref (depay->acc);
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depay->acc = NULL;
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depay->prev_ts = -1;
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depay->header_mask = 0;
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}
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static GstStateChangeReturn
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gst_rtp_dv_depay_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstRTPDVDepay *depay = GST_RTP_DV_DEPAY (element);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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gst_rtp_dv_depay_reset (depay);
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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_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
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(element, transition), GST_STATE_CHANGE_FAILURE);
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_rtp_dv_depay_reset (depay);
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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_dv_depay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtpdvdepay",
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GST_RANK_SECONDARY, GST_TYPE_RTP_DV_DEPAY);
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}
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