mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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343 lines
9.2 KiB
C
343 lines
9.2 KiB
C
/* GStreamer
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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 "gstrfc2250enc.h"
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/* elementfactory information */
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static GstElementDetails rfc2250_enc_details = {
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"RFC 2250 packet encoder",
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"Codec/Parser",
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"LGPL",
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"transforms MPEG1/2 video to an RFC 2250 compliant format",
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VERSION,
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"Wim Taymans <wim.taymans@chello.be>",
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"(C) 2001",
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};
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#define CLASS(o) GST_RFC2250_ENC_CLASS (G_OBJECT_GET_CLASS (o))
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/* GstRFC2250Enc 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_PAD_TEMPLATE_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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"rfc2250_enc_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 (FALSE)
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)
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);
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GST_PAD_TEMPLATE_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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"rfc2250_enc_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 (FALSE)
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)
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);
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static void gst_rfc2250_enc_class_init (GstRFC2250EncClass *klass);
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static void gst_rfc2250_enc_init (GstRFC2250Enc *rfc2250_enc);
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static GstElementStateReturn
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gst_rfc2250_enc_change_state (GstElement *element);
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static void gst_rfc2250_enc_loop (GstElement *element);
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static void gst_rfc2250_enc_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_rfc2250_enc_signals[LAST_SIGNAL] = { 0 };*/
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GType
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gst_rfc2250_enc_get_type (void)
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{
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static GType rfc2250_enc_type = 0;
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if (!rfc2250_enc_type) {
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static const GTypeInfo rfc2250_enc_info = {
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sizeof(GstRFC2250EncClass), NULL,
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NULL,
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(GClassInitFunc)gst_rfc2250_enc_class_init,
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NULL,
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NULL,
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sizeof(GstRFC2250Enc),
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0,
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(GInstanceInitFunc)gst_rfc2250_enc_init,
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};
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rfc2250_enc_type = g_type_register_static(GST_TYPE_ELEMENT, "GstRFC2250Enc", &rfc2250_enc_info, 0);
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}
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return rfc2250_enc_type;
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}
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static void
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gst_rfc2250_enc_class_init (GstRFC2250EncClass *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_rfc2250_enc_get_property;
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gstelement_class->change_state = gst_rfc2250_enc_change_state;
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}
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static void
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gst_rfc2250_enc_init (GstRFC2250Enc *rfc2250_enc)
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{
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rfc2250_enc->sinkpad = gst_pad_new_from_template(
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GST_PAD_TEMPLATE_GET (sink_factory), "sink");
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gst_element_add_pad(GST_ELEMENT(rfc2250_enc),rfc2250_enc->sinkpad);
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gst_element_set_loop_function (GST_ELEMENT (rfc2250_enc), gst_rfc2250_enc_loop);
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rfc2250_enc->srcpad = gst_pad_new_from_template(
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GST_PAD_TEMPLATE_GET (src_factory), "src");
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gst_element_add_pad(GST_ELEMENT(rfc2250_enc),rfc2250_enc->srcpad);
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/* initialize parser state */
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rfc2250_enc->packetize = NULL;
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rfc2250_enc->next_ts = 0;
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rfc2250_enc->packet = 0;
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/* zero counters (should be done at RUNNING?) */
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rfc2250_enc->bit_rate = 0;
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rfc2250_enc->MTU = 3048;
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GST_FLAG_SET (rfc2250_enc, GST_ELEMENT_EVENT_AWARE);
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}
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static void
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gst_rfc2250_enc_new_buffer (GstRFC2250Enc *enc)
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{
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if (enc->packet) {
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gst_pad_push (enc->srcpad, enc->packet);
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}
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enc->packet = gst_buffer_new ();
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enc->flags = 0;
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enc->remaining = enc->MTU;
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}
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static void
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gst_rfc2250_enc_add_slice (GstRFC2250Enc *enc, GstBuffer *buffer)
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{
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gint slice_length = GST_BUFFER_SIZE (buffer);
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/* see if the slice fits in the current buffer */
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if (slice_length <= enc->remaining) {
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gst_buffer_merge (enc->packet, buffer);
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gst_buffer_unref (buffer);
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enc->remaining -= slice_length;
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}
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/* it doesn't fit */
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else {
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/* do we need to start a new packet? */
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if (slice_length <= enc->MTU) {
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gst_rfc2250_enc_new_buffer (enc);
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gst_buffer_merge (enc->packet, buffer);
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gst_buffer_unref (buffer);
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enc->remaining -= slice_length;
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}
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/* else we have to fragment */
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else {
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gint offset = 0;
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while (slice_length > 0) {
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GstBuffer *outbuf;
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outbuf = gst_buffer_create_sub (buffer, offset, MIN (enc->remaining, slice_length));
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gst_buffer_merge (enc->packet, outbuf);
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slice_length -= GST_BUFFER_SIZE (outbuf);
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offset += GST_BUFFER_SIZE (outbuf);
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gst_buffer_unref (outbuf);
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gst_rfc2250_enc_new_buffer (enc);
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}
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gst_buffer_unref (buffer);
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}
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}
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}
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static void
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gst_rfc2250_enc_loop (GstElement *element)
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{
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GstRFC2250Enc *enc = GST_RFC2250_ENC (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 (enc->packetize);
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id = GST_MPEG_PACKETIZE_ID (enc->packetize);
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mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (enc->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, "rfc2250enc: have chunk 0x%02X", id);
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switch (id) {
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case SEQUENCE_START_CODE:
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gst_rfc2250_enc_new_buffer (enc);
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enc->flags |= ENC_HAVE_SEQ;
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break;
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case GOP_START_CODE:
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if (enc->flags & ENC_HAVE_DATA) {
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gst_rfc2250_enc_new_buffer (enc);
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}
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enc->flags |= ENC_HAVE_GOP;
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break;
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case PICTURE_START_CODE:
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if (enc->flags & ENC_HAVE_DATA) {
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gst_rfc2250_enc_new_buffer (enc);
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}
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enc->flags |= ENC_HAVE_PIC;
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break;
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case EXT_START_CODE:
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case USER_START_CODE:
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case SEQUENCE_ERROR_START_CODE:
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case SEQUENCE_END_START_CODE:
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break;
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default:
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/* do this here because of the long range */
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if (id >= SLICE_MIN_START_CODE && id <= SLICE_MAX_START_CODE) {
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enc->flags |= ENC_HAVE_DATA;
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gst_rfc2250_enc_add_slice (enc, buffer);
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buffer = NULL;
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break;
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}
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break;
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}
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if (buffer) {
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gst_buffer_merge (enc->packet, buffer);
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enc->remaining -= GST_BUFFER_SIZE (buffer);
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gst_buffer_unref (buffer);
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}
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}
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else {
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if (enc->packet) {
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gst_pad_push (enc->srcpad, enc->packet);
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enc->packet = NULL;
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enc->flags = 0;
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enc->remaining = enc->MTU;
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}
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gst_pad_event_default (enc->sinkpad, GST_EVENT (data));
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}
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}
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static GstElementStateReturn
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gst_rfc2250_enc_change_state (GstElement *element)
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{
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GstRFC2250Enc *rfc2250_enc = GST_RFC2250_ENC (element);
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switch (GST_STATE_TRANSITION (element)) {
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case GST_STATE_NULL_TO_READY:
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if (!rfc2250_enc->packetize) {
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rfc2250_enc->packetize = gst_mpeg_packetize_new (rfc2250_enc->sinkpad, GST_MPEG_PACKETIZE_VIDEO);
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}
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break;
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case GST_STATE_READY_TO_NULL:
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if (rfc2250_enc->packetize) {
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gst_mpeg_packetize_destroy (rfc2250_enc->packetize);
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rfc2250_enc->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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GST_ELEMENT_CLASS (parent_class)->change_state (element);
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return GST_STATE_SUCCESS;
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}
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static void
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gst_rfc2250_enc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstRFC2250Enc *rfc2250_enc;
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/* it's not null if we got it, but it might not be ours */
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rfc2250_enc = GST_RFC2250_ENC(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, rfc2250_enc->bit_rate);
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break;
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case ARG_MPEG2:
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if (rfc2250_enc->packetize)
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g_value_set_boolean (value, GST_MPEG_PACKETIZE_IS_MPEG2 (rfc2250_enc->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_rfc2250_enc_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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return FALSE;
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/* create an elementfactory for the rfc2250_enc element */
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factory = gst_element_factory_new ("rfc2250enc", GST_TYPE_RFC2250_ENC,
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&rfc2250_enc_details);
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g_return_val_if_fail(factory != NULL, FALSE);
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gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (src_factory));
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gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_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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