我要评论高通ais cam.xml配置
参数解析代码：
else if ((!xmlStrcmp(cur->name, (const xmlChar *)"display_setting")))
{
XML_GET_INT_ATTR(input->window_params.pipeline_id, cur, "pipeline", 1, int, -1);
XML_GET_INT_ATTR(input->window_params.n_buffers_display, cur, "nbufs", 1, int, 3);
XML_GET_STRING_ATTR(format, cur, "format", 1, "uyvy");
input->window_params.format = translate_format_string(format);
这些参数定义在结构体 test_util_window_param_t 中
/// Parameters used to identify and define properties given to windows to be displayed.
typedef struct
{
char debug_name[64]; ///< Debug name for window
int display_id; ///< Specific display output ID
int pipeline_id; ///< Specific pipeline ID
float window_size[2]; ///< Output window size [width, height]
float window_pos[2]; ///< Output window position [x, y]
float window_source_size[2]; ///< Source window size [width, height]
float window_source_pos[2]; ///< Source window position [x, y]
int zorder; ///< Window position in Z plane
int visibility; ///< Window visibility (0 - not visible, else visible)
int buffer_size[2];
int is_displayable; ///< Is window to be displayed
test_util_color_fmt_t format; ///< Displayable format if need to convert
int n_buffers_display; ///< Number of buffers if we need to convert to displayable format
} test_util_window_param_t;
pipeline_id 有解析，但是实际并没有用到
display_id 有解析，但是实际并没有用到，尴尬了，上面的多路配置还有多个屏的，实际高通并没有用过
n_buffers_display
XML_GET_INT_ATTR(input->window_params.n_buffers_display, attr, "nbufs", 1, int, 3);
test应用中用了：
input_ctxt->buffers_param[QCARCAM_TEST_BUFFERS_DISPLAY].n_buffers = p_xml_input->window_params.n_buffers_display;
n_buffers
<display_setting display_id="0" nbufs="3" ====》对应 n_buffers_display
<output_setting width="1920" height="1024" nbufs="5" />
====》对应 XML_GET_INT_ATTR(input->output_params.n_buffers, cur, "nbufs", 1, int, 3);
test应用中用了：
input_ctxt->buffers_param[QCARCAM_TEST_BUFFERS_OUTPUT].n_buffers = p_xml_input->output_params.n_buffers;
看来要看drm架构的屏相关的？？
format
xml默认设置成uyvy，这里设置成nv12
看代码实际没有用这里的设置参数，test代码中固定使用了RGB888格式，xml里面的设置没用到
input_ctxt->buffers_param[QCARCAM_TEST_BUFFERS_DISPLAY].format = QCARCAM_FMT_RGB_888;
本文地址：https://blog.csdn.net/xuecz1230/article/details/110138095
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