gst-launch-1.0 --gst-debug-level = 2 dvbsr c modulation = частота "QAM 256" = 147000000! имя декодера = demux demux. ! очередь ! аудиосэмпл! аудиоконвертировать! voaacen c! Мультиплексор. mpegtsmux name = mux! udpsink host = 127.01.01.10 port = 22 demux. ! очередь ! видеоконверт! видеомасштаб x264en c битрейт = 1258 мелодия = нулевая задержка! video / x-h264, stream-format = byte-stream, profile = high, width = 540, height = 380, key-int-max = 15! mux.
Я пытаюсь по конвейеру сделать эту командную строку. Но я сталкиваюсь со многими типами ошибок. Я не могу создавать командную строку, используя инфраструктуру Gstreamer. Я хочу преобразовать его в код.
#include <gst/gst.h>
#include <glib.h>
int main(int argc, char * argv[]) {
GstElement * pipeline, * filter, * audio_source, * tee, * audio_queue, * audio_convert, * audio_resample, * audio_sink;
GstElement * video_queue, * visual, * video_convert, * video_sink;
GstBus * bus;
GstMessage * msg;
GstCaps * filtercaps;
GstPad * tee_audio_pad, * tee_video_pad;
GstPad * queue_audio_pad, * queue_video_pad;
/* Initialize GStreamer */
gst_init( & argc, & argv);
/* Create the elements */
audio_source = gst_element_factory_make("audiotestsrc", "audio_source");
tee = gst_element_factory_make("tee", "tee");
audio_queue = gst_element_factory_make("queue", "audio_queue");
audio_convert = gst_element_factory_make("audioconvert", "audio_convert");
audio_resample = gst_element_factory_make("audioresample", "audio_resample");
audio_sink = gst_element_factory_make("autoaudiosink", "audio_sink");
video_queue = gst_element_factory_make("queue", "video_queue");
visual = gst_element_factory_make("wavescope", "visual");
video_convert = gst_element_factory_make("videoconvert", "csp");
video_sink = gst_element_factory_make("autovideosink", "video_sink");
filter = gst_element_factory_make("capsfilter", "filter");
g_assert(filter != NULL); /* should always exist */
/* Create the empty pipeline */
pipeline = gst_pipeline_new("test-pipeline");
if (!pipeline || !audio_source || !tee || !audio_queue || !audio_convert || !audio_resample || !audio_sink || !video_queue || !visual || !video_convert || !video_sink) {
g_printerr("Not all elements could be created.\n");
return -1;
}
/* Configure elements */
g_object_set(audio_source, "freq", 215.0 f, NULL);
g_object_set(visual, "shader", 0, "style", 1, NULL);
/* Link all elements that can be automatically linked because they have "Always" pads */
gst_bin_add_many(GST_BIN(pipeline), filter, audio_source, tee, audio_queue, audio_convert, audio_resample, audio_sink,
video_queue, visual, video_convert, video_sink, NULL);
if (gst_element_link_many(audio_source, tee, NULL) != TRUE ||
gst_element_link_many(audio_queue, audio_convert, audio_resample, audio_sink, NULL) != TRUE ||
gst_element_link_many(video_queue, visual, video_convert, video_sink, NULL) != TRUE) {
g_printerr("Elements could not be linked.\n");
gst_object_unref(pipeline);
return -1;
}
/* Manually link the , which has "Request" pads */
tee_audio_pad = gst_element_get_request_pad(tee, "src_%u");
g_print("Obtained request pad %s for audio branch.\n", gst_pad_get_name(tee_audio_pad));
queue_audio_pad = gst_element_get_static_pad(audio_queue, "sink");
tee_video_pad = gst_element_get_request_pad(tee, "src_%u");
g_print("Obtained request pad %s for video branch.\n", gst_pad_get_name(tee_video_pad));
queue_video_pad = gst_element_get_static_pad(video_queue, "sink");
if (gst_pad_link(tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||
gst_pad_link(tee_video_pad, queue_video_pad) != GST_PAD_LINK_OK) {
g_printerr("Tee could not be linked.\n");
gst_object_unref(pipeline);
return -1;
}
filtercaps = gst_caps_new_simple("video/x-raw",
"format", G_TYPE_STRING, "RGB16",
"width", G_TYPE_INT, 640,
"height", G_TYPE_INT, 480,
"framerate", GST_TYPE_FRACTION, 25, 1,
NULL);
g_object_set(G_OBJECT(filter), "caps", filtercaps, NULL);
gst_caps_unref(filtercaps);
gst_object_unref(queue_audio_pad);
gst_object_unref(queue_video_pad);
/* Start playing the pipeline */
gst_element_set_state(pipeline, GST_STATE_PLAYING);
/* Wait until error or EOS */
bus = gst_element_get_bus(pipeline);
msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Release the request pads from the Tee, and unref them */
gst_element_release_request_pad(tee, tee_audio_pad);
gst_element_release_request_pad(tee, tee_video_pad);
gst_object_unref(tee_audio_pad);
gst_object_unref(tee_video_pad);
/* Free resources */
if (msg != NULL) {
gst_message_unref(msg);
}
gst_object_unref(bus);
gst_element_set_state(pipeline, GST_STATE_NULL);
gst_object_unref(pipeline);
return 0;
}