以上请使用gstreamer1.16.3的api来进行完成
时间: 2024-03-01 18:51:58 浏览: 279
对不起,我的回答可能有一些偏离您的问题。在GStreamer中,您可以使用`h264parse`元素来解析H264流,并获取SPS和PPS数据。以下是使用GStreamer获取H264流Profile信息的示例代码:
```C
#include <gst/gst.h>
static GstFlowReturn on_new_sample(GstElement *sink, gpointer user_data)
{
GstSample *sample;
GstBuffer *buffer;
GstMapInfo map;
guint8 *data;
gint size;
// 获取sample
g_signal_emit_by_name(sink, "pull-sample", &sample);
if (!sample) {
return GST_FLOW_ERROR;
}
// 获取buffer
buffer = gst_sample_get_buffer(sample);
if (!buffer) {
gst_sample_unref(sample);
return GST_FLOW_ERROR;
}
// 获取buffer数据
gst_buffer_map(buffer, &map, GST_MAP_READ);
data = map.data;
size = map.size;
// 查找SPS和PPS
guint8 *sps = NULL, *pps = NULL;
gint sps_size = 0, pps_size = 0;
for (gint i = 0; i < size - 4; i++) {
if (data[i] == 0x00 && data[i+1] == 0x00 &&
data[i+2] == 0x00 && data[i+3] == 0x01) {
guint8 nal_type = (data[i+4] & 0x1F);
if (nal_type == 7) { // SPS
sps = data + i + 4;
for (gint j = i + 5; j < size - 4; j++) {
if (data[j] == 0x00 && data[j+1] == 0x00 &&
data[j+2] == 0x00 && data[j+3] == 0x01) {
pps = data + j + 4;
sps_size = j - i - 4;
pps_size = size - j - 4;
break;
}
}
if (pps) {
break;
}
}
}
}
// 输出SPS和PPS
if (sps && pps) {
guint8 profile_idc = sps[1];
guint8 level_idc = sps[3];
printf("Profile: %d, Level: %d\n", profile_idc, level_idc);
}
// 释放sample和buffer
gst_buffer_unmap(buffer, &map);
gst_sample_unref(sample);
return GST_FLOW_OK;
}
int main(int argc, char *argv[])
{
GstElement *pipeline, *source, *h264parse, *sink;
GstBus *bus;
GstCaps *caps;
// 初始化GStreamer
gst_init(&argc, &argv);
// 创建元素
pipeline = gst_pipeline_new("test-pipeline");
source = gst_element_factory_make("filesrc", NULL);
g_object_set(source, "location", "test.h264", NULL);
h264parse = gst_element_factory_make("h264parse", NULL);
sink = gst_element_factory_make("fakesink", NULL);
// 添加元素到pipeline
gst_bin_add_many(GST_BIN(pipeline), source, h264parse, sink, NULL);
gst_element_link_many(source, h264parse, sink, NULL);
// 设置h264parse的caps
caps = gst_caps_from_string("video/x-h264, stream-format=byte-stream");
g_object_set(h264parse, "caps", caps, NULL);
gst_caps_unref(caps);
// 监听new-sample信号
g_signal_connect(sink, "new-sample", G_CALLBACK(on_new_sample), NULL);
// 启动pipeline
gst_element_set_state(pipeline, GST_STATE_PLAYING);
// 进入主循环
bus = gst_element_get_bus(pipeline);
gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
gst_object_unref(bus);
// 停止pipeline
gst_element_set_state(pipeline, GST_STATE_NULL);
gst_object_unref(pipeline);
return 0;
}
```
这个示例代码中,我们创建了一个GStreamer pipeline,其中包含了`filesrc`、`h264parse`和`fakesink`元素。我们通过`filesrc`从文件中读取H264流,然后使用`h264parse`元素解析流,并通过`fakesink`元素将解析后的流丢弃。在`fakesink`元素的`new-sample`信号回调函数中,我们获取解析后的H264流数据,并查找其中的SPS和PPS数据。最后,我们输出SPS和PPS数据中的Profile信息和Level信息。
需要注意的是,`h264parse`元素默认不输出SPS和PPS数据,如果您需要获取这些数据,需要设置元素的caps为`video/x-h264, stream-format=byte-stream`,这样就可以确保元素输出的是完整的NALU数据流。
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