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370 lines
10 KiB
C
370 lines
10 KiB
C
/* Gnome-Streamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*#define GST_DEBUG_ENABLED*/
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#include "gstmpegparse.h"
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/* elementfactory information */
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static GstElementDetails mpeg_parse_details = {
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"MPEG System Parser",
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"Filter/Parser/System",
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"Demultiplexes MPEG1 and MPEG2 System Streams",
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VERSION,
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"Erik Walthinsen <omega@cse.ogi.edu>\n"
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"Wim Taymans <wim.taymans@chello.be>",
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"(C) 1999",
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};
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#define CLASS(o) GST_MPEG_PARSE_CLASS (G_OBJECT_GET_CLASS (o))
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/* GstMPEGParse signals and args */
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enum {
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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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ARG_0,
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ARG_BIT_RATE,
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ARG_MPEG2,
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/* FILL ME */
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};
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GST_PADTEMPLATE_FACTORY (sink_factory,
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"sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"mpeg_parse_sink",
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"video/mpeg",
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"mpegversion", GST_PROPS_INT_RANGE (1, 2),
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"systemstream", GST_PROPS_BOOLEAN (TRUE)
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)
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);
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GST_PADTEMPLATE_FACTORY (src_factory,
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"src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"mpeg_parse_src",
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"video/mpeg",
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"mpegversion", GST_PROPS_INT_RANGE (1, 2),
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"systemstream", GST_PROPS_BOOLEAN (TRUE),
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"parsed", GST_PROPS_BOOLEAN (TRUE)
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)
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);
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static void gst_mpeg_parse_class_init (GstMPEGParseClass *klass);
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static void gst_mpeg_parse_init (GstMPEGParse *mpeg_parse);
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static GstElementStateReturn
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gst_mpeg_parse_change_state (GstElement *element);
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static gboolean gst_mpeg_parse_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer);
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static void gst_mpeg_parse_send_data (GstMPEGParse *mpeg_parse, GstData *data);
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static void gst_mpeg_parse_loop (GstElement *element);
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static void gst_mpeg_parse_get_property (GObject *object, guint prop_id,
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GValue *value, GParamSpec *pspec);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_mpeg_parse_signals[LAST_SIGNAL] = { 0 };*/
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GType
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gst_mpeg_parse_get_type (void)
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{
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static GType mpeg_parse_type = 0;
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if (!mpeg_parse_type) {
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static const GTypeInfo mpeg_parse_info = {
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sizeof(GstMPEGParseClass), NULL,
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NULL,
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(GClassInitFunc)gst_mpeg_parse_class_init,
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NULL,
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NULL,
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sizeof(GstMPEGParse),
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0,
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(GInstanceInitFunc)gst_mpeg_parse_init,
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};
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mpeg_parse_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMPEGParse", &mpeg_parse_info, 0);
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}
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return mpeg_parse_type;
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}
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static void
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gst_mpeg_parse_class_init (GstMPEGParseClass *klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass*)klass;
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gstelement_class = (GstElementClass*)klass;
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parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BIT_RATE,
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g_param_spec_uint("bit_rate","bit_rate","bit_rate",
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0, G_MAXUINT, 0, G_PARAM_READABLE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MPEG2,
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g_param_spec_boolean ("mpeg2", "mpeg2", "is this an mpeg2 stream",
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FALSE, G_PARAM_READABLE));
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gobject_class->get_property = gst_mpeg_parse_get_property;
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gstelement_class->change_state = gst_mpeg_parse_change_state;
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klass->parse_packhead = gst_mpeg_parse_parse_packhead;
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klass->parse_syshead = NULL;
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klass->parse_packet = NULL;
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klass->parse_pes = NULL;
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klass->send_data = gst_mpeg_parse_send_data;
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}
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static void
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gst_mpeg_parse_init (GstMPEGParse *mpeg_parse)
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{
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mpeg_parse->sinkpad = gst_pad_new_from_template(
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GST_PADTEMPLATE_GET (sink_factory), "sink");
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gst_element_add_pad(GST_ELEMENT(mpeg_parse),mpeg_parse->sinkpad);
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gst_element_set_loop_function (GST_ELEMENT (mpeg_parse), gst_mpeg_parse_loop);
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mpeg_parse->srcpad = gst_pad_new_from_template(
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GST_PADTEMPLATE_GET (src_factory), "src");
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gst_element_add_pad(GST_ELEMENT(mpeg_parse),mpeg_parse->srcpad);
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/* initialize parser state */
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mpeg_parse->packetize = NULL;
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mpeg_parse->next_ts = 0;
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/* zero counters (should be done at RUNNING?) */
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mpeg_parse->bit_rate = 0;
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GST_FLAG_SET (mpeg_parse, GST_ELEMENT_EVENT_AWARE);
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}
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static void
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gst_mpeg_parse_send_data (GstMPEGParse *mpeg_parse, GstData *data)
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{
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if (GST_IS_EVENT (data)) {
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gst_pad_event_default (mpeg_parse->sinkpad, GST_EVENT (data));
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}
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else {
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guint64 size = GST_BUFFER_SIZE (data);
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if (!GST_PAD_CAPS (mpeg_parse->srcpad)) {
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gboolean mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize);
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gst_pad_try_set_caps (mpeg_parse->srcpad,
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GST_CAPS_NEW (
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"mpeg_parse_src",
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"video/mpeg",
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"mpegversion", GST_PROPS_INT (mpeg2 ? 2 : 1),
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"systemstream", GST_PROPS_BOOLEAN (TRUE),
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"parsed", GST_PROPS_BOOLEAN (TRUE)
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));
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}
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GST_BUFFER_TIMESTAMP (data) = mpeg_parse->next_ts;
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gst_pad_push (mpeg_parse->srcpad, GST_BUFFER (data));
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mpeg_parse->next_ts += ((size * 1000000.0) / (mpeg_parse->bit_rate));
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GST_DEBUG (0, "mpeg_parse: next_ts %lld\n", mpeg_parse->next_ts);
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}
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}
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static gboolean
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gst_mpeg_parse_parse_packhead (GstMPEGParse *mpeg_parse, GstBuffer *buffer)
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{
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guint8 *buf;
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guint64 scr;
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guint32 scr1, scr2;
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guint32 new_rate;
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GST_DEBUG (0, "mpeg_parse: in parse_packhead\n");
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buf = GST_BUFFER_DATA (buffer);
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buf += 4;
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scr1 = GUINT32_FROM_BE (*(guint32*) buf);
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scr2 = GUINT32_FROM_BE (*(guint32*) (buf+4));
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if (GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize)) {
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/* :2=01 ! scr:3 ! marker:1==1 ! scr:15 ! marker:1==1 ! scr:15 */
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scr = (scr1 & 0x38000000) << 3;
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scr |= (scr1 & 0x03fff800) << 4;
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scr |= (scr1 & 0x000003ff) << 5;
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scr |= (scr2 & 0xf8000000) >> 27;
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buf += 6;
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new_rate = (GUINT32_FROM_BE ((*(guint32 *) buf)) & 0xfffffc00) >> 10;
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new_rate *= 133; /* FIXME trial and error */
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}
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else {
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scr = (scr1 & 0x0e000000) << 5;
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scr |= (scr1 & 0x00fffe00) << 6;
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scr |= (scr1 & 0x000000ff) << 7;
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scr |= (scr2 & 0xfe000000) >> 25;
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buf += 5;
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new_rate = (GUINT32_FROM_BE ((*(guint32 *) buf)) & 0x7ffffe00) >> 9;
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new_rate *= 400;
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}
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GST_DEBUG (0, "mpeg_parse: SCR is %llu\n", scr);
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mpeg_parse->next_ts = (scr*100)/9;
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if (mpeg_parse->bit_rate != new_rate) {
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mpeg_parse->bit_rate = new_rate;
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gst_element_send_event (GST_ELEMENT (mpeg_parse),
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gst_event_new_info ("bitrate", GST_PROPS_INT (new_rate), NULL));
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}
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GST_DEBUG (0, "mpeg_parse: stream is %1.3fMbs\n",
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(mpeg_parse->bit_rate) / 1000000.0);
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return TRUE;
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}
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static void
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gst_mpeg_parse_loop (GstElement *element)
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{
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GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (element);
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GstData *data;
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guint id;
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gboolean mpeg2;
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data = gst_mpeg_packetize_read (mpeg_parse->packetize);
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id = GST_MPEG_PACKETIZE_ID (mpeg_parse->packetize);
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mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize);
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if (GST_IS_BUFFER (data)) {
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GstBuffer *buffer = GST_BUFFER (data);
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GST_DEBUG (0, "mpeg2demux: have chunk 0x%02X\n", id);
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switch (id) {
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case 0xba:
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if (CLASS (mpeg_parse)->parse_packhead) {
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CLASS (mpeg_parse)->parse_packhead (mpeg_parse, buffer);
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}
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break;
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case 0xbb:
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if (CLASS (mpeg_parse)->parse_syshead) {
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CLASS (mpeg_parse)->parse_syshead (mpeg_parse, buffer);
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}
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break;
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default:
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if (mpeg2 && ((id < 0xBD) || (id > 0xFE))) {
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g_warning ("mpeg2demux: ******** unknown id 0x%02X", id);
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}
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else {
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if (mpeg2) {
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if (CLASS (mpeg_parse)->parse_pes) {
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CLASS (mpeg_parse)->parse_pes (mpeg_parse, buffer);
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}
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}
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else {
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if (CLASS (mpeg_parse)->parse_packet) {
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CLASS (mpeg_parse)->parse_packet (mpeg_parse, buffer);
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}
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}
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}
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}
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}
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if (CLASS (mpeg_parse)->send_data)
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CLASS (mpeg_parse)->send_data (mpeg_parse, data);
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}
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static GstElementStateReturn
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gst_mpeg_parse_change_state (GstElement *element)
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{
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GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (element);
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switch (GST_STATE_TRANSITION (element)) {
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case GST_STATE_READY_TO_PAUSED:
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if (!mpeg_parse->packetize) {
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mpeg_parse->packetize = gst_mpeg_packetize_new (mpeg_parse->sinkpad, GST_MPEG_PACKETIZE_SYSTEM);
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}
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break;
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case GST_STATE_PAUSED_TO_READY:
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if (mpeg_parse->packetize) {
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gst_mpeg_packetize_destroy (mpeg_parse->packetize);
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mpeg_parse->packetize = NULL;
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}
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break;
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default:
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break;
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}
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return GST_ELEMENT_CLASS (parent_class)->change_state (element);
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}
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static void
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gst_mpeg_parse_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstMPEGParse *mpeg_parse;
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/* it's not null if we got it, but it might not be ours */
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mpeg_parse = GST_MPEG_PARSE(object);
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switch (prop_id) {
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case ARG_BIT_RATE:
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g_value_set_uint (value, mpeg_parse->bit_rate);
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break;
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case ARG_MPEG2:
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if (mpeg_parse->packetize)
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g_value_set_boolean (value, GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize));
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else
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g_value_set_boolean (value, FALSE);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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gboolean
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gst_mpeg_parse_plugin_init (GModule *module, GstPlugin *plugin)
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{
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GstElementFactory *factory;
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/* this filter needs the bytestream package */
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if (!gst_library_load("gstbytestream")) {
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gst_info("mpeg_parse:: could not load support library: 'gstbytestream'\n");
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return FALSE;
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}
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/* create an elementfactory for the mpeg_parse element */
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factory = gst_elementfactory_new("mpegparse",GST_TYPE_MPEG_PARSE,
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&mpeg_parse_details);
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g_return_val_if_fail(factory != NULL, FALSE);
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gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (src_factory));
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gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (sink_factory));
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
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return TRUE;
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}
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