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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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425 lines
11 KiB
C
425 lines
11 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 "gstmp1videoparse.h"
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/* Start codes. */
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#define SEQ_START_CODE 0x000001b3
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#define GOP_START_CODE 0x000001b8
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#define PICTURE_START_CODE 0x00000100
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#define SLICE_MIN_START_CODE 0x00000101
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#define SLICE_MAX_START_CODE 0x000001af
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#define EXT_START_CODE 0x000001b5
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#define USER_START_CODE 0x000001b2
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#define SEQUENCE_ERROR_CODE 0x000001b4
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#define SEQ_END_CODE 0x000001b7
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/* elementfactory information */
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static GstElementDetails mp1videoparse_details = {
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"MPEG 1 Video Parser",
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"Codec/Parser",
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"LGPL",
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"Parses and frames MPEG 1 video streams, provides seek",
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VERSION,
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"Wim Taymans <wim.taymans@chello.be>",
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"(C) 2000",
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};
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static GstPadTemplate*
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src_factory (void)
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{
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return
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gst_pad_template_new (
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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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"mp1videoparse_src",
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"video/mpeg",
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gst_props_new (
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"mpegversion", GST_PROPS_INT (1),
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"systemstream", GST_PROPS_BOOLEAN (FALSE),
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"sliced", GST_PROPS_BOOLEAN (TRUE),
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NULL)),
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NULL);
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}
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static GstPadTemplate*
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sink_factory (void)
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{
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return
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gst_pad_template_new (
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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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"mp1videoparse_sink",
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"video/mpeg",
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gst_props_new (
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"mpegversion", GST_PROPS_INT (1),
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"systemstream", GST_PROPS_BOOLEAN (FALSE),
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NULL)),
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NULL);
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}
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/* Mp1VideoParse 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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/* FILL ME */
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};
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static void gst_mp1videoparse_class_init (Mp1VideoParseClass *klass);
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static void gst_mp1videoparse_init (Mp1VideoParse *mp1videoparse);
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static void gst_mp1videoparse_chain (GstPad *pad, GstBuffer *buf);
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static void gst_mp1videoparse_real_chain (Mp1VideoParse *mp1videoparse, GstBuffer *buf, GstPad *outpad);
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/* defined but not used
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static void gst_mp1videoparse_flush (Mp1VideoParse *mp1videoparse);
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*/
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static GstPadTemplate *src_template, *sink_template;
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static GstElementClass *parent_class = NULL;
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/*static guint gst_mp1videoparse_signals[LAST_SIGNAL] = { 0 }; */
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GType
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mp1videoparse_get_type (void)
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{
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static GType mp1videoparse_type = 0;
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if (!mp1videoparse_type) {
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static const GTypeInfo mp1videoparse_info = {
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sizeof(Mp1VideoParseClass), NULL,
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NULL,
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(GClassInitFunc)gst_mp1videoparse_class_init,
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NULL,
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NULL,
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sizeof(Mp1VideoParse),
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0,
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(GInstanceInitFunc)gst_mp1videoparse_init,
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};
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mp1videoparse_type = g_type_register_static(GST_TYPE_ELEMENT, "Mp1VideoParse", &mp1videoparse_info, 0);
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}
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return mp1videoparse_type;
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}
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static void
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gst_mp1videoparse_class_init (Mp1VideoParseClass *klass)
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{
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GstElementClass *gstelement_class;
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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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}
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static void
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gst_mp1videoparse_init (Mp1VideoParse *mp1videoparse)
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{
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mp1videoparse->sinkpad = gst_pad_new_from_template (sink_template, "sink");
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gst_element_add_pad(GST_ELEMENT(mp1videoparse),mp1videoparse->sinkpad);
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gst_pad_set_chain_function(mp1videoparse->sinkpad,gst_mp1videoparse_chain);
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mp1videoparse->srcpad = gst_pad_new_from_template (src_template, "src");
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gst_element_add_pad(GST_ELEMENT(mp1videoparse),mp1videoparse->srcpad);
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mp1videoparse->partialbuf = NULL;
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mp1videoparse->need_resync = FALSE;
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mp1videoparse->last_pts = 0;
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mp1videoparse->picture_in_buffer = 0;
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}
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static gboolean
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mp1videoparse_valid_sync (gulong head)
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{
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if (head == SEQ_START_CODE)
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return TRUE;
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if (head == GOP_START_CODE)
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return TRUE;
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if (head == PICTURE_START_CODE)
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return TRUE;
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if (head >= SLICE_MIN_START_CODE &&
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head <= SLICE_MAX_START_CODE)
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return TRUE;
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if (head == USER_START_CODE)
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return TRUE;
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if (head == EXT_START_CODE)
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return TRUE;
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return FALSE;
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}
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static gint
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mp1videoparse_find_next_gop (Mp1VideoParse *mp1videoparse, GstBuffer *buf)
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{
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guchar *data = GST_BUFFER_DATA(buf);
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gulong size = GST_BUFFER_SIZE(buf);
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gulong offset = 0;
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gint sync_zeros = 0;
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gboolean have_sync = FALSE;
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while (offset < size) {
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guchar byte = *(data+offset);
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offset++;
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if (byte == 0) {
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sync_zeros++;
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}
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else if (byte == 1 && sync_zeros >=2 ) {
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sync_zeros = 0;
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have_sync = TRUE;
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}
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else if (have_sync) {
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if (byte == (SEQ_START_CODE & 0xff) || byte == (GOP_START_CODE & 0xff)) return offset-4;
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else {
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sync_zeros = 0;
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have_sync = FALSE;
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}
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}
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else {
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sync_zeros = 0;
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}
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}
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return -1;
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}
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/* defined but not used
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static void
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gst_mp1videoparse_flush (Mp1VideoParse *mp1videoparse)
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{
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GST_DEBUG (0,"mp1videoparse: flushing");
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if (mp1videoparse->partialbuf) {
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gst_buffer_unref(mp1videoparse->partialbuf);
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mp1videoparse->partialbuf= NULL;
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}
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mp1videoparse->need_resync = TRUE;
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mp1videoparse->in_flush = TRUE;
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mp1videoparse->picture_in_buffer = 0;
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}
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*/
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static void
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gst_mp1videoparse_chain (GstPad *pad,GstBuffer *buf)
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{
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Mp1VideoParse *mp1videoparse;
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g_return_if_fail (pad != NULL);
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g_return_if_fail (GST_IS_PAD (pad));
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g_return_if_fail (buf != NULL);
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mp1videoparse = GST_MP1VIDEOPARSE (GST_OBJECT_PARENT (pad));
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gst_mp1videoparse_real_chain(mp1videoparse, buf, mp1videoparse->srcpad);
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}
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static void
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gst_mp1videoparse_real_chain (Mp1VideoParse *mp1videoparse, GstBuffer *buf, GstPad *outpad)
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{
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guchar *data;
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gulong size, offset = 0;
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GstBuffer *outbuf;
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gint sync_state;
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gboolean have_sync;
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guchar sync_byte;
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gulong head;
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gint sync_pos;
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guint64 time_stamp;
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GstBuffer *temp;
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/* g_return_if_fail(GST_IS_BUFFER(buf)); */
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time_stamp = GST_BUFFER_TIMESTAMP(buf);
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/* FIXME, handle events here */
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/*
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gst_mp1videoparse_flush(mp1videoparse);
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*/
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if (mp1videoparse->partialbuf) {
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GstBuffer *merge;
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offset = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
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merge = gst_buffer_merge(mp1videoparse->partialbuf, buf);
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gst_buffer_unref(mp1videoparse->partialbuf);
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gst_buffer_unref(buf);
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mp1videoparse->partialbuf = merge;
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}
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else {
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mp1videoparse->partialbuf = buf;
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offset = 0;
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}
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data = GST_BUFFER_DATA(mp1videoparse->partialbuf);
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size = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
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GST_DEBUG (0,"mp1videoparse: received buffer of %ld bytes %lld",size, GST_BUFFER_TIMESTAMP(buf));
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head = GULONG_FROM_BE(*((gulong *)data));
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GST_DEBUG (0,"mp1videoparse: head is %08lx", head);
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if (!mp1videoparse_valid_sync(head) || mp1videoparse->need_resync) {
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sync_pos = mp1videoparse_find_next_gop(mp1videoparse, mp1videoparse->partialbuf);
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if (sync_pos != -1) {
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mp1videoparse->need_resync = FALSE;
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GST_DEBUG (0,"mp1videoparse: found new gop at %d", sync_pos);
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if (sync_pos != 0) {
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temp = gst_buffer_create_sub(mp1videoparse->partialbuf, sync_pos, size-sync_pos);
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g_assert(temp != NULL);
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gst_buffer_unref(mp1videoparse->partialbuf);
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mp1videoparse->partialbuf = temp;
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data = GST_BUFFER_DATA(mp1videoparse->partialbuf);
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size = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
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offset = 0;
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}
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}
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else {
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GST_DEBUG (0,"mp1videoparse: could not sync");
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gst_buffer_unref(mp1videoparse->partialbuf);
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mp1videoparse->partialbuf = NULL;
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return;
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}
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}
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if (mp1videoparse->picture_in_buffer == 1) {
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mp1videoparse->last_pts = time_stamp;
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}
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sync_state = 0;
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have_sync = FALSE;
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GST_DEBUG (0,"mp1videoparse: searching sync");
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while (offset < size-1) {
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sync_byte = *(data + offset);
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/*printf(" %d %02x\n", offset, sync_byte); */
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if (sync_byte == 0) {
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sync_state++;
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}
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else if ((sync_byte == 1) && (sync_state >=2)) {
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GST_DEBUG (0,"mp1videoparse: code 0x000001%02x",data[offset+1]);
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if (data[offset+1] == (PICTURE_START_CODE & 0xff)) {
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mp1videoparse->picture_in_buffer++;
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if (mp1videoparse->picture_in_buffer == 1) {
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mp1videoparse->last_pts = time_stamp;
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sync_state = 0;
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}
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else if (mp1videoparse->picture_in_buffer == 2) {
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have_sync = TRUE;
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break;
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}
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else {
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GST_DEBUG (0,"mp1videoparse: %d in buffer", mp1videoparse->picture_in_buffer);
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g_assert_not_reached();
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}
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}
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else sync_state = 0;
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}
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/* something else... */
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else sync_state = 0;
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/* go down the buffer */
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offset++;
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}
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if (have_sync) {
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offset -= 2;
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GST_DEBUG (0,"mp1videoparse: synced at %ld code 0x000001%02x",offset,data[offset+3]);
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outbuf = gst_buffer_create_sub(mp1videoparse->partialbuf, 0, offset+4);
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g_assert(outbuf != NULL);
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GST_BUFFER_TIMESTAMP(outbuf) = mp1videoparse->last_pts;
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if (mp1videoparse->in_flush) {
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/* FIXME, send a flush event here */
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mp1videoparse->in_flush = FALSE;
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}
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GST_DEBUG (0,"mp1videoparse: pushing %d bytes %llu", GST_BUFFER_SIZE(outbuf), GST_BUFFER_TIMESTAMP(outbuf));
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gst_pad_push(outpad, outbuf);
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GST_DEBUG (0,"mp1videoparse: pushing done");
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mp1videoparse->picture_in_buffer = 0;
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temp = gst_buffer_create_sub(mp1videoparse->partialbuf, offset, size-offset);
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gst_buffer_unref(mp1videoparse->partialbuf);
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mp1videoparse->partialbuf = temp;
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}
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else {
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mp1videoparse->last_pts = time_stamp;
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}
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}
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/* FIXME
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static GstElementStateReturn
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gst_mp1videoparse_change_state (GstElement *element)
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{
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Mp1VideoParse *mp1videoparse;
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g_return_val_if_fail(GST_IS_MP1VIDEOPARSE(element),GST_STATE_FAILURE);
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mp1videoparse = GST_MP1VIDEOPARSE(element);
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GST_DEBUG (0,"mp1videoparse: state pending %d", GST_STATE_PENDING(element));
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* if going down into NULL state, clear out buffers *
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if (GST_STATE_PENDING(element) == GST_STATE_READY) {
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gst_mp1videoparse_flush(mp1videoparse);
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}
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* if we haven't failed already, give the parent class a chance to ;-) *
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if (GST_ELEMENT_CLASS(parent_class)->change_state)
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return GST_ELEMENT_CLASS(parent_class)->change_state(element);
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return GST_STATE_SUCCESS;
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}
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*/
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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GstElementFactory *factory;
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/* create an elementfactory for the mp1videoparse element */
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factory = gst_element_factory_new("mp1videoparse",GST_TYPE_MP1VIDEOPARSE,
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&mp1videoparse_details);
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g_return_val_if_fail(factory != NULL, FALSE);
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src_template = src_factory ();
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gst_element_factory_add_pad_template (factory, src_template);
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sink_template = sink_factory ();
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gst_element_factory_add_pad_template (factory, sink_template);
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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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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"mp1videoparse",
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plugin_init
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};
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