--- /dev/null
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+//#define GST_DEBUG_ENABLED
+#include "gstmp1videoparse.h"
+
+/* Start codes. */
+#define SEQ_START_CODE 0x000001b3
+#define GOP_START_CODE 0x000001b8
+#define PICTURE_START_CODE 0x00000100
+#define SLICE_MIN_START_CODE 0x00000101
+#define SLICE_MAX_START_CODE 0x000001af
+#define EXT_START_CODE 0x000001b5
+#define USER_START_CODE 0x000001b2
+#define SEQUENCE_ERROR_CODE 0x000001b4
+#define SEQ_END_CODE 0x000001b7
+
+/* elementfactory information */
+static GstElementDetails mp1videoparse_details = {
+ "MPEG 1 Video Parser",
+ "Filter/Parser/Video",
+ "Parses and frames MPEG 1 video streams, provides seek",
+ VERSION,
+ "Wim Taymans <wim.taymans@chello.be>",
+ "(C) 2000",
+};
+
+static GstPadTemplate*
+src_factory (void)
+{
+ return
+ gst_padtemplate_new (
+ "src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ gst_caps_new (
+ "mp1videoparse_src",
+ "video/mpeg",
+ gst_props_new (
+ "mpegversion", GST_PROPS_INT (1),
+ "systemstream", GST_PROPS_BOOLEAN (FALSE),
+ "sliced", GST_PROPS_BOOLEAN (TRUE),
+ NULL)),
+ NULL);
+}
+
+static GstPadTemplate*
+sink_factory (void)
+{
+ return
+ gst_padtemplate_new (
+ "sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ gst_caps_new (
+ "mp1videoparse_sink",
+ "video/mpeg",
+ gst_props_new (
+ "mpegversion", GST_PROPS_INT (1),
+ "systemstream", GST_PROPS_BOOLEAN (FALSE),
+ NULL)),
+ NULL);
+}
+
+/* Mp1VideoParse signals and args */
+enum {
+ /* FILL ME */
+ LAST_SIGNAL
+};
+
+enum {
+ ARG_0,
+ /* FILL ME */
+};
+
+static void gst_mp1videoparse_class_init (Mp1VideoParseClass *klass);
+static void gst_mp1videoparse_init (Mp1VideoParse *mp1videoparse);
+
+static void gst_mp1videoparse_chain (GstPad *pad, GstBuffer *buf);
+static void gst_mp1videoparse_real_chain (Mp1VideoParse *mp1videoparse, GstBuffer *buf, GstPad *outpad);
+
+static void gst_mp1videoparse_flush (Mp1VideoParse *mp1videoparse);
+
+static GstPadTemplate *src_template, *sink_template;
+
+static GstElementClass *parent_class = NULL;
+//static guint gst_mp1videoparse_signals[LAST_SIGNAL] = { 0 };
+
+GType
+mp1videoparse_get_type (void)
+{
+ static GType mp1videoparse_type = 0;
+
+ if (!mp1videoparse_type) {
+ static const GTypeInfo mp1videoparse_info = {
+ sizeof(Mp1VideoParseClass), NULL,
+ NULL,
+ (GClassInitFunc)gst_mp1videoparse_class_init,
+ NULL,
+ NULL,
+ sizeof(Mp1VideoParse),
+ 0,
+ (GInstanceInitFunc)gst_mp1videoparse_init,
+ };
+ mp1videoparse_type = g_type_register_static(GST_TYPE_ELEMENT, "Mp1VideoParse", &mp1videoparse_info, 0);
+ }
+ return mp1videoparse_type;
+}
+
+static void
+gst_mp1videoparse_class_init (Mp1VideoParseClass *klass)
+{
+ GstElementClass *gstelement_class;
+
+ gstelement_class = (GstElementClass*)klass;
+
+ parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+}
+
+static void
+gst_mp1videoparse_init (Mp1VideoParse *mp1videoparse)
+{
+ mp1videoparse->sinkpad = gst_pad_new_from_template (sink_template, "sink");
+ gst_pad_set_caps (mp1videoparse->sinkpad, gst_pad_get_padtemplate_caps (mp1videoparse->sinkpad));
+ gst_element_add_pad(GST_ELEMENT(mp1videoparse),mp1videoparse->sinkpad);
+ gst_pad_set_chain_function(mp1videoparse->sinkpad,gst_mp1videoparse_chain);
+
+ mp1videoparse->srcpad = gst_pad_new_from_template (src_template, "src");
+ gst_pad_set_caps (mp1videoparse->srcpad, gst_pad_get_padtemplate_caps (mp1videoparse->srcpad));
+ gst_element_add_pad(GST_ELEMENT(mp1videoparse),mp1videoparse->srcpad);
+
+ mp1videoparse->partialbuf = NULL;
+ mp1videoparse->need_resync = FALSE;
+ mp1videoparse->last_pts = 0;
+ mp1videoparse->picture_in_buffer = 0;
+}
+
+static gboolean
+mp1videoparse_valid_sync (gulong head)
+{
+ if (head == SEQ_START_CODE)
+ return TRUE;
+ if (head == GOP_START_CODE)
+ return TRUE;
+ if (head == PICTURE_START_CODE)
+ return TRUE;
+ if (head >= SLICE_MIN_START_CODE &&
+ head <= SLICE_MAX_START_CODE)
+ return TRUE;
+ if (head == USER_START_CODE)
+ return TRUE;
+ if (head == EXT_START_CODE)
+ return TRUE;
+
+ return FALSE;
+}
+
+static gint
+mp1videoparse_find_next_gop (Mp1VideoParse *mp1videoparse, GstBuffer *buf)
+{
+ guchar *data = GST_BUFFER_DATA(buf);
+ gulong size = GST_BUFFER_SIZE(buf);
+ gulong offset = 0;
+ gint sync_zeros = 0;
+ gboolean have_sync = FALSE;
+
+ while (offset < size) {
+ guchar byte = *(data+offset);
+ offset++;
+ if (byte == 0) {
+ sync_zeros++;
+ }
+ else if (byte == 1 && sync_zeros >=2 ) {
+ sync_zeros = 0;
+ have_sync = TRUE;
+ }
+ else if (have_sync) {
+ if (byte == (SEQ_START_CODE & 0xff) || byte == (GOP_START_CODE & 0xff)) return offset-4;
+ else {
+ sync_zeros = 0;
+ have_sync = FALSE;
+ }
+ }
+ else {
+ sync_zeros = 0;
+ }
+ }
+
+ return -1;
+}
+
+static void
+gst_mp1videoparse_flush (Mp1VideoParse *mp1videoparse)
+{
+ GST_DEBUG (0,"mp1videoparse: flushing\n");
+ if (mp1videoparse->partialbuf) {
+ gst_buffer_unref(mp1videoparse->partialbuf);
+ mp1videoparse->partialbuf= NULL;
+ }
+ mp1videoparse->need_resync = TRUE;
+ mp1videoparse->in_flush = TRUE;
+ mp1videoparse->picture_in_buffer = 0;
+}
+
+static void
+gst_mp1videoparse_chain (GstPad *pad,GstBuffer *buf)
+{
+ Mp1VideoParse *mp1videoparse;
+
+ g_return_if_fail (pad != NULL);
+ g_return_if_fail (GST_IS_PAD (pad));
+ g_return_if_fail (buf != NULL);
+
+ mp1videoparse = GST_MP1VIDEOPARSE (GST_OBJECT_PARENT (pad));
+
+ gst_mp1videoparse_real_chain(mp1videoparse, buf, mp1videoparse->srcpad);
+}
+
+static void
+gst_mp1videoparse_real_chain (Mp1VideoParse *mp1videoparse, GstBuffer *buf, GstPad *outpad)
+{
+ guchar *data;
+ gulong size, offset = 0;
+ GstBuffer *outbuf;
+ gint sync_state;
+ gboolean have_sync;
+ guchar sync_byte;
+ gulong head;
+ gint sync_pos;
+ guint64 time_stamp;
+ GstBuffer *temp;
+
+// g_return_if_fail(GST_IS_BUFFER(buf));
+
+
+ time_stamp = GST_BUFFER_TIMESTAMP(buf);
+
+
+ if (GST_BUFFER_FLAG_IS_SET(buf, GST_BUFFER_FLUSH)) {
+ gst_mp1videoparse_flush(mp1videoparse);
+ }
+
+ if (mp1videoparse->partialbuf) {
+ offset = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
+ mp1videoparse->partialbuf = gst_buffer_append(mp1videoparse->partialbuf, buf);
+ gst_buffer_unref(buf);
+ }
+ else {
+ mp1videoparse->partialbuf = buf;
+ offset = 0;
+ }
+
+ data = GST_BUFFER_DATA(mp1videoparse->partialbuf);
+ size = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
+
+ GST_DEBUG (0,"mp1videoparse: received buffer of %ld bytes %lld\n",size, GST_BUFFER_TIMESTAMP(buf));
+
+ head = GULONG_FROM_BE(*((gulong *)data));
+
+ GST_DEBUG (0,"mp1videoparse: head is %08lx\n", head);
+
+ if (!mp1videoparse_valid_sync(head) || mp1videoparse->need_resync) {
+ sync_pos = mp1videoparse_find_next_gop(mp1videoparse, mp1videoparse->partialbuf);
+ if (sync_pos != -1) {
+ mp1videoparse->need_resync = FALSE;
+ GST_DEBUG (0,"mp1videoparse: found new gop at %d\n", sync_pos);
+
+ if (sync_pos != 0) {
+ temp = gst_buffer_create_sub(mp1videoparse->partialbuf, sync_pos, size-sync_pos);
+ g_assert(temp != NULL);
+ gst_buffer_unref(mp1videoparse->partialbuf);
+ mp1videoparse->partialbuf = temp;
+ data = GST_BUFFER_DATA(mp1videoparse->partialbuf);
+ size = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
+ offset = 0;
+ }
+ }
+ else {
+ GST_DEBUG (0,"mp1videoparse: could not sync\n");
+ gst_buffer_unref(mp1videoparse->partialbuf);
+ mp1videoparse->partialbuf = NULL;
+ return;
+ }
+ }
+
+ if (mp1videoparse->picture_in_buffer == 1) {
+ mp1videoparse->last_pts = time_stamp;
+ }
+
+ sync_state = 0;
+ have_sync = FALSE;
+
+ GST_DEBUG (0,"mp1videoparse: searching sync\n");
+
+ while (offset < size-1) {
+ sync_byte = *(data + offset);
+ //printf(" %d %02x\n", offset, sync_byte);
+ if (sync_byte == 0) {
+ sync_state++;
+ }
+ else if ((sync_byte == 1) && (sync_state >=2)) {
+ GST_DEBUG (0,"mp1videoparse: code 0x000001%02x\n",data[offset+1]);
+ if (data[offset+1] == (PICTURE_START_CODE & 0xff)) {
+ mp1videoparse->picture_in_buffer++;
+ if (mp1videoparse->picture_in_buffer == 1) {
+ mp1videoparse->last_pts = time_stamp;
+ sync_state = 0;
+ }
+ else if (mp1videoparse->picture_in_buffer == 2) {
+ have_sync = TRUE;
+ break;
+ }
+ else {
+ GST_DEBUG (0,"mp1videoparse: %d in buffer\n", mp1videoparse->picture_in_buffer);
+ g_assert_not_reached();
+ }
+ }
+ else sync_state = 0;
+ }
+ // something else...
+ else sync_state = 0;
+ // go down the buffer
+ offset++;
+ }
+
+ if (have_sync) {
+ offset -= 2;
+ GST_DEBUG (0,"mp1videoparse: synced at %ld code 0x000001%02x\n",offset,data[offset+3]);
+
+ outbuf = gst_buffer_create_sub(mp1videoparse->partialbuf, 0, offset+4);
+ g_assert(outbuf != NULL);
+ GST_BUFFER_TIMESTAMP(outbuf) = mp1videoparse->last_pts;
+
+ if (mp1videoparse->in_flush) {
+ GST_BUFFER_FLAG_SET(outbuf, GST_BUFFER_FLUSH);
+ mp1videoparse->in_flush = FALSE;
+ }
+
+ GST_DEBUG (0,"mp1videoparse: pushing %d bytes %llu\n", GST_BUFFER_SIZE(outbuf), GST_BUFFER_TIMESTAMP(outbuf));
+ gst_pad_push(outpad, outbuf);
+ GST_DEBUG (0,"mp1videoparse: pushing done\n");
+ mp1videoparse->picture_in_buffer = 0;
+
+ temp = gst_buffer_create_sub(mp1videoparse->partialbuf, offset, size-offset);
+ gst_buffer_unref(mp1videoparse->partialbuf);
+ mp1videoparse->partialbuf = temp;
+ }
+ else {
+ mp1videoparse->last_pts = time_stamp;
+ }
+}
+
+/* FIXME
+static GstElementStateReturn
+gst_mp1videoparse_change_state (GstElement *element)
+{
+ Mp1VideoParse *mp1videoparse;
+ g_return_val_if_fail(GST_IS_MP1VIDEOPARSE(element),GST_STATE_FAILURE);
+
+ mp1videoparse = GST_MP1VIDEOPARSE(element);
+ GST_DEBUG (0,"mp1videoparse: state pending %d\n", GST_STATE_PENDING(element));
+
+ // if going down into NULL state, clear out buffers
+ if (GST_STATE_PENDING(element) == GST_STATE_READY) {
+ gst_mp1videoparse_flush(mp1videoparse);
+ }
+
+ // if we haven't failed already, give the parent class a chance to ;-)
+ if (GST_ELEMENT_CLASS(parent_class)->change_state)
+ return GST_ELEMENT_CLASS(parent_class)->change_state(element);
+
+ return GST_STATE_SUCCESS;
+}
+*/
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+ GstElementFactory *factory;
+
+ /* create an elementfactory for the mp1videoparse element */
+ factory = gst_elementfactory_new("mp1videoparse",GST_TYPE_MP1VIDEOPARSE,
+ &mp1videoparse_details);
+ g_return_val_if_fail(factory != NULL, FALSE);
+
+ src_template = src_factory ();
+ gst_elementfactory_add_padtemplate (factory, src_template);
+
+ sink_template = sink_factory ();
+ gst_elementfactory_add_padtemplate (factory, sink_template);
+
+ gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+ return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+ GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ "mp1videoparse",
+ plugin_init
+};
--- /dev/null
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#ifndef __MP1VIDEOPARSE_H__
+#define __MP1VIDEOPARSE_H__
+
+
+#include <config.h>
+#include <gst/gst.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+#define GST_TYPE_MP1VIDEOPARSE \
+ (mp1videoparse_get_type())
+#define GST_MP1VIDEOPARSE(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MP1VIDEOPARSE,Mp1VideoParse))
+#define GST_MP1VIDEOPARSE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MP1VIDEOPARSE,Mp1VideoParse))
+#define GST_IS_MP1VIDEOPARSE(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MP1VIDEOPARSE))
+#define GST_IS_MP1VIDEOPARSE_CLASS(obj) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MP1VIDEOPARSE))
+
+typedef struct _Mp1VideoParse Mp1VideoParse;
+typedef struct _Mp1VideoParseClass Mp1VideoParseClass;
+
+struct _Mp1VideoParse {
+ GstElement element;
+
+ GstPad *sinkpad,*srcpad;
+
+ GstBuffer *partialbuf; // previous buffer (if carryover)
+ gulong next_buffer_offset;
+ gboolean need_resync;
+ gboolean in_flush;
+ guint64 last_pts;
+ gint picture_in_buffer;
+
+};
+
+struct _Mp1VideoParseClass {
+ GstElementClass parent_class;
+};
+
+GType gst_mp1videoparse_get_type(void);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#endif /* __MP1VIDEOPARSE_H__ */
projects / platform / upstream / gstreamer.git / commitdiff