Question

嗨，当我尝试以下脚本时，它不起作用：appsink示例为空。但是，当我直接将“ videotestsrc”链接到“ videoconvert-x264enc-appsink”时，它可以工作，而当我直接将“ appsrc”连接到“ appsink”时，它也可以工作...问题是什么？谢谢。

gst_init(NULL,NULL);

使用videotestsrc具有数据缓冲区：

GstElement *pipeline2; 
pipeline2 = gst_pipeline_new("pipeline"); 
GstElement *appsink2; 
appsink2 = gst_element_factory_make("appsink", "BufferSink2"); 
GstElement *videotestsrc = gst_element_factory_make("videotestsrc", "source"); 
g_object_set(G_OBJECT(videotestsrc), "num-buffers", 1, NULL); 
gst_bin_add_many(GST_BIN(pipeline2), videotestsrc, appsink2, NULL); 
GstCaps *caps2 = gst_caps_new_simple("video/x-raw", "format", G_TYPE_STRING, "GRAY8", "width", G_TYPE_INT, 100, "height", G_TYPE_INT, 100, NULL); 
gst_element_link_filtered(videotestsrc, appsink2, caps2); 
GstStateChangeReturn retPip2 = gst_element_set_state(pipeline2, GST_STATE_PLAYING); 

GstSample *sample2 = gst_app_sink_pull_sample (GST_APP_SINK(appsink2)); 
GstBuffer *buffer2= gst_sample_get_buffer(sample2); 
GstMapInfo map2; 
gst_buffer_map(buffer2, &map2, GST_MAP_READ); 
uchar source[map2.size]; 
memmove(source, map2.data, map2.size);

将数据放入appsrc中：

int size = map2.size; 
GstFlowReturn ret; 
GstElement *appsrc; 
appsrc = gst_element_factory_make("appsrc", "appsrc"); 
g_object_set(G_OBJECT(appsrc), "blocksize", size, NULL); 
g_object_set(G_OBJECT(appsrc), "num-buffers", 1, NULL); 

GstBuffer *buffer; 
buffer = gst_buffer_new_allocate(NULL,size, NULL); 
GstMapInfo map; 
gst_buffer_map(buffer, &map, GST_MAP_WRITE); 
uchar *buf = map.data; 
memcpy(buf, source, size); 
ret = gst_app_src_push_buffer(GST_APP_SRC(appsrc), buffer); 

g_object_set(G_OBJECT(appsrc), "caps", gst_caps_new_simple("video/x-raw", "format", G_TYPE_STRING, "GRAY8", "width", G_TYPE_INT, 100, "height", G_TYPE_INT, 100, NULL), NULL);

设置上限：

GstCaps *cap_appsrc_to_x264enc; 
cap_appsrc_to_x264enc = gst_caps_new_simple("video/x-raw", "format", G_TYPE_STRING, "GRAY8", "width", G_TYPE_INT, 100, "height", G_TYPE_INT, 100, NULL); 

GstCaps *cap_x264enc_to_sink; 
cap_x264enc_to_sink = gst_caps_new_simple("video/x-h264", "profile", G_TYPE_STRING, "main", NULL);

创建对象：

GstElement *x264enc = gst_element_factory_make("x264enc", "encoder"); 

g_object_set(G_OBJECT(x264enc), "qp-max", 20, NULL); 


g_object_set(G_OBJECT(x264enc), "pass", 17, NULL); // VBR Pass 1 

g_object_set(G_OBJECT(x264enc), "bitrate", 2000, NULL); 

GstCaps *caps; 
caps = gst_caps_new_simple("video/x-raw", "format", G_TYPE_STRING, "I420", NULL); 

GstElement *appsink; 
appsink = gst_element_factory_make("appsink", "BufferSink"); 

GstElement *convert = gst_element_factory_make("videoconvert", "convert");

管道：

GstElement *pipeline; 
pipeline = gst_pipeline_new("pipeline"); 


gst_bin_add_many(GST_BIN(pipeline), appsrc, convert, x264enc, appsink, NULL); 
gst_element_link_filtered(appsrc, convert, cap_appsrc_to_x264enc); 
gst_element_link_filtered(convert, x264enc, caps); 
gst_element_link_filtered(x264enc,appsink, cap_x264enc_to_sink); 

GstStateChangeReturn retPip = gst_element_set_state(pipeline, GST_STATE_PLAYING);

使用appsink将数据放入缓冲区：

GstSample *sample = gst_app_sink_pull_sample (GST_APP_SINK(appsink)); 
GstBuffer *encBuffer= gst_sample_get_buffer(sample); 
gsize senc = gst_buffer_get_size (encBuffer); 
GstMapInfo mapEnc; 
gst_buffer_map(encBuffer, &mapEnc, GST_MAP_READ); 
uchar pRet[mapEnc.size]; 
memmove(pRet, mapEnc.data, mapEnc.size);

Gstreamer中的Appsrc-x264enc-appsink：不起作用

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