我正在编写一个使用PulseAudio API的Python应用程序。该实现大量使用用Python编写并由PulseAudio的C代码调用的回调函数。将C数组指针转换为Python数组结构
最多的信息被传递到由特定结构的回调,例如pa_sink_info
,这是defined用C如下:
typedef struct pa_sink_info {
const char *name;
uint32_t index;
const char *description;
pa_sample_spec sample_spec;
pa_channel_map channel_map;
uint32_t owner_module;
pa_cvolume volume;
int mute;
uint32_t monitor_source;
const char *monitor_source_name;
pa_usec_t latency;
const char *driver;
pa_sink_flags_t flags;
pa_proplist *proplist;
pa_usec_t configured_latency;
pa_volume_t base_volume;
pa_sink_state_t state;
uint32_t n_volume_steps;
uint32_t card;
uint32_t n_ports;
pa_sink_port_info** ports;
pa_sink_port_info* active_port;
uint8_t n_formats;
pa_format_info **formats;
} pa_sink_info;
从这个结构是很容易得到标值,例如:
self.some_proc(
struct.contents.index,
struct.contents.name,
struct.contents.description)
但我必须处理ports
和active_port
,困难这在Python中被描述为:
('n_ports', uint32_t),
('ports', POINTER(POINTER(pa_sink_port_info))),
('active_port', POINTER(pa_sink_port_info)),
这里n_ports
指定ports
中的元素数,它是指向pa_sink_port_info
类型结构的指针数组的指针数组。实际上,我甚至不知道如何将它们转换为Python类型。
将ports
转换成包含pa_sink_port_info
的Python字典的最有效方法是什么?