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Fixed the MPEG2 to MPEG1 recoder, we need cannot create dangling elements with the current scheduler. Remove the subt...
Original commit message from CVS: Fixed the MPEG2 to MPEG1 recoder, we need cannot create dangling elements with the current scheduler. Remove the subtitle parser because it's not possible with the current scheduler. Added a padtemplate for MPEG2 subtitles.
This commit is contained in:
Wim Taymans
parent
bd021a5384
commit
a76f5340e3
2 changed files with 51 additions and 39 deletions
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@ -1,6 +1,16 @@
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<chapter id="cha-dynamic">
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<title>Dynamic pipelines</title>
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<para>
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this chapter we will see how you can create a dynamic pipleine. A dynamic
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pipeline is a pipeline that is updated or created while media is flowing
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through it. We will create a partial pipeline first and add more elements
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while the pipeline is playing. Dynamic pipelines cause all sorts of
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scheduling issues and will remain a topic of research for a long time in
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GStreamer.
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</para>
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<para>
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We will show how to create an mpeg1 video player using the dynamic pipeline
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</para>
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</chapter>
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@ -6,20 +6,43 @@
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#include <glib.h>
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#include <gst/gst.h>
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GstElement *mux;
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GstElement *merge_subtitles;
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static GstElement *mux = NULL;
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static GstElement *merge_subtitles;
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static GstElement *fdsink;
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void eof(GstElement *src) {
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static void
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eof(GstElement *src)
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{
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g_print("have eos, quitting\n");
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exit(0);
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}
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void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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static GstPad*
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create_muxer (GstElement *pipeline, gchar *type, gchar *number)
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{
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if (!mux) {
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mux = gst_elementfactory_make("system_encode","mux");
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g_return_val_if_fail(mux != NULL, NULL);
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gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(mux));
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gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(fdsink));
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gst_pad_connect(gst_element_get_pad(mux,"src"),
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gst_element_get_pad(fdsink,"sink"));
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}
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gtk_object_set(GTK_OBJECT(mux), type, number,NULL);
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return gst_element_get_pad(mux,g_strconcat (type, "_", number, NULL));
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}
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static void
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mp2tomp1 (GstElement *parser, GstPad *pad, GstElement *pipeline)
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{
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GstElement *parse_audio, *parse_video, *decode, *decode_video, *play, *encode, *audio_resample;
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GstElement *smooth, *median;
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GstElement *audio_queue, *video_queue;
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GstElement *audio_thread, *video_thread;
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GstElement *videoscale, *audio_encode;
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GstPad *muxerpad;
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g_print("***** a new pad %s was created\n", gst_pad_get_name(pad));
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gst_element_set_state(GST_ELEMENT(pipeline),GST_STATE_PAUSED);
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@ -27,10 +50,6 @@ void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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// connect to audio pad
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//if (0) {
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if (strncmp(gst_pad_get_name(pad), "private_stream_1.0", 18) == 0) {
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gst_plugin_load("ac3parse");
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gst_plugin_load("ac3dec");
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gst_plugin_load("audioscale");
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gst_plugin_load("mpegaudio");
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// construct internal pipeline elements
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parse_audio = gst_elementfactory_make("ac3parse","parse_audio");
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g_return_if_fail(parse_audio != NULL);
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@ -54,7 +73,7 @@ void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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gst_bin_add(GST_BIN(audio_thread),GST_ELEMENT(audio_resample));
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gst_bin_add(GST_BIN(audio_thread),GST_ELEMENT(audio_encode));
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gtk_object_set(GTK_OBJECT(mux),"audio","00",NULL);
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muxerpad = create_muxer (pipeline, "audio", "00");
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// set up pad connections
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gst_element_add_ghost_pad(GST_ELEMENT(audio_thread),
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@ -66,7 +85,7 @@ void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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gst_pad_connect(gst_element_get_pad(audio_resample,"src"),
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gst_element_get_pad(audio_encode,"sink"));
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gst_pad_connect(gst_element_get_pad(audio_encode,"src"),
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gst_element_get_pad(mux,"audio_00"));
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muxerpad);
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// construct queue and connect everything in the main pipelie
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audio_queue = gst_elementfactory_make("queue","audio_queue");
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@ -83,11 +102,9 @@ void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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g_print("setting to READY state\n");
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gst_element_set_state(GST_ELEMENT(audio_thread),GST_STATE_READY);
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} else if (strncmp(gst_pad_get_name(pad), "subtitle_stream_4", 17) == 0) {
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gst_pad_connect(pad,
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gst_element_get_pad(merge_subtitles,"subtitle"));
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//gst_pad_connect(pad,
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// gst_element_get_pad(merge_subtitles,"subtitle"));
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} else if (strncmp(gst_pad_get_name(pad), "audio_", 6) == 0) {
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gst_plugin_load("mp3parse");
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gst_plugin_load("mpg123");
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// construct internal pipeline elements
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parse_audio = gst_elementfactory_make("mp3parse","parse_audio");
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g_return_if_fail(parse_audio != NULL);
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@ -129,21 +146,14 @@ void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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} else if (strncmp(gst_pad_get_name(pad), "video_", 6) == 0) {
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//} else if (0) {
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gst_plugin_load("mp1videoparse");
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gst_plugin_load("mpeg2play");
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gst_plugin_load("mpeg2subt");
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gst_plugin_load("smooth");
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gst_plugin_load("median");
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gst_plugin_load("videoscale");
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gst_plugin_load("mpeg2enc");
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//gst_plugin_load("mpeg1encoder");
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// construct internal pipeline elements
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parse_video = gst_elementfactory_make("mp1videoparse","parse_video");
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parse_video = gst_elementfactory_make("mp2videoparse","parse_video");
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g_return_if_fail(parse_video != NULL);
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decode_video = gst_elementfactory_make("mpeg2play","decode_video");
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g_return_if_fail(decode_video != NULL);
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merge_subtitles = gst_elementfactory_make("mpeg2subt","merge_subtitles");
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g_return_if_fail(merge_subtitles != NULL);
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//merge_subtitles = gst_elementfactory_make("mpeg2subt","merge_subtitles");
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//g_return_if_fail(merge_subtitles != NULL);
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videoscale = gst_elementfactory_make("videoscale","videoscale");
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g_return_if_fail(videoscale != NULL);
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gtk_object_set(GTK_OBJECT(videoscale),"width",352, "height", 288,NULL);
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@ -158,12 +168,12 @@ void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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gtk_object_set(GTK_OBJECT(smooth),"active",FALSE,NULL);
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encode = gst_elementfactory_make("mpeg2enc","encode");
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g_return_if_fail(encode != NULL);
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//gtk_object_set(GTK_OBJECT(encode),"frames_per_second",25.0,NULL);
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gtk_object_set(GTK_OBJECT(encode),"frames_per_second",29.97,NULL);
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gtk_object_set(GTK_OBJECT(encode),"frames_per_second",25.0,NULL);
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//gtk_object_set(GTK_OBJECT(encode),"frames_per_second",29.97,NULL);
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//encode = gst_elementfactory_make("mpeg1encoder","encode");
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//gtk_object_set(GTK_OBJECT(show),"width",640, "height", 480,NULL);
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gtk_object_set(GTK_OBJECT(mux),"video","00",NULL);
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muxerpad = create_muxer (pipeline, "video", "00");
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// create the thread and pack stuff into it
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video_thread = gst_thread_new("video_thread");
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@ -185,15 +195,15 @@ void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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gst_pad_connect(gst_element_get_pad(decode_video,"src"),
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gst_element_get_pad(median,"sink"));
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gst_pad_connect(gst_element_get_pad(median,"src"),
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gst_element_get_pad(merge_subtitles,"video"));
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gst_pad_connect(gst_element_get_pad(merge_subtitles,"src"),
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// gst_element_get_pad(merge_subtitles,"video"));
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//gst_pad_connect(gst_element_get_pad(merge_subtitles,"src"),
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gst_element_get_pad(videoscale,"sink"));
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gst_pad_connect(gst_element_get_pad(videoscale,"src"),
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gst_element_get_pad(smooth,"sink"));
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gst_pad_connect(gst_element_get_pad(smooth,"src"),
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gst_element_get_pad(encode,"sink"));
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gst_pad_connect(gst_element_get_pad(encode,"src"),
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gst_element_get_pad(mux,"video_00"));
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muxerpad);
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// construct queue and connect everything in the main pipeline
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video_queue = gst_elementfactory_make("queue","video_queue");
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@ -216,15 +226,12 @@ void mp2tomp1(GstElement *parser,GstPad *pad, GstElement *pipeline) {
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int main(int argc,char *argv[]) {
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GstElement *pipeline, *src, *parse;
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GstElement *fdsink;
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GstElementFactory *fdsinkfactory;
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int fd;
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g_print("have %d args\n",argc);
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gst_init(&argc,&argv);
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gst_plugin_load("mpeg2parse");
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gst_plugin_load("system_encode");
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pipeline = gst_pipeline_new("pipeline");
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g_return_val_if_fail(pipeline != NULL, -1);
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@ -244,8 +251,6 @@ int main(int argc,char *argv[]) {
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parse = gst_elementfactory_make("mpeg2parse","parse");
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g_return_val_if_fail(parse != NULL, -1);
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mux = gst_elementfactory_make("system_encode","mux");
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g_return_val_if_fail(mux != NULL, -1);
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fd = open(argv[2],O_CREAT|O_RDWR|O_TRUNC, S_IREAD|S_IWRITE);
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g_return_val_if_fail(fd >= 0, -1);
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fdsinkfactory = gst_elementfactory_find("fdsink");
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@ -256,8 +261,7 @@ int main(int argc,char *argv[]) {
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gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(src));
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gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(parse));
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gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(mux));
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gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(fdsink));
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gtk_signal_connect(GTK_OBJECT(parse),"new_pad",mp2tomp1, pipeline);
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@ -265,8 +269,6 @@ int main(int argc,char *argv[]) {
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gst_pad_connect(gst_element_get_pad(src,"src"),
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gst_element_get_pad(parse,"sink"));
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gst_pad_connect(gst_element_get_pad(mux,"src"),
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gst_element_get_pad(fdsink,"sink"));
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g_print("setting to READY state\n");
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gst_element_set_state(GST_ELEMENT(pipeline),GST_STATE_PLAYING);
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