int main(int argc, char* argv[])
{
AVFormatContext *pFormatCtx;
AVDeviceInfoList*pDeviceList;
AVInputFormat *ifmt;
AVDictionary* options = NULL;
AVOutputFormat *ofmt;
av_register_all();
avdevice_register_all();
pFormatCtx = avformat_alloc_context();
av_dict_set(&options, "list_devices", "true", 0);
ifmt = av_find_input_format("gdigrab");
if (avformat_open_input(&pFormatCtx, "title=D:\\project\\fftest\\fftest\\bin\\list_devices.exe", ifmt, &options) != 0) {
printf("open dshow error\n");
//return -1;
}
//pFormatCtx->iformat = ifmt;
avdevice_list_devices(pFormatCtx, &pDeviceList);
avdevice_list_input_sources(ifmt, "desktop", options, &pDeviceList);
ofmt = av_guess_format("dshow", NULL, NULL);
avdevice_list_output_sinks(ofmt, NULL, NULL, &pDeviceList);
return 0;
}
static int list_devices_for_context(AVFormatContext *s, AVDictionary *options,
AVDeviceInfoList **device_list)
{
AVDictionary *tmp = NULL;
int ret;
av_dict_copy(&tmp, options, 0);
if ((ret = av_opt_set_dict2(s, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)
goto fail;
ret = avdevice_list_devices(s, device_list);
fail:
av_dict_free(&tmp);
avformat_free_context(s);
return ret;
}
QVector<QPair<QString, QString>> CameraDevice::getRawDeviceListGeneric()
{
QVector<QPair<QString, QString>> devices;
if (!getDefaultInputFormat())
return devices;
// Alloc an input device context
AVFormatContext *s;
if (!(s = avformat_alloc_context()))
return devices;
if (!iformat->priv_class || !AV_IS_INPUT_DEVICE(iformat->priv_class->category))
{
avformat_free_context(s);
return devices;
}
s->iformat = iformat;
if (s->iformat->priv_data_size > 0)
{
s->priv_data = av_mallocz(s->iformat->priv_data_size);
if (!s->priv_data)
{
avformat_free_context(s);
return devices;
}
if (s->iformat->priv_class)
{
*(const AVClass**)s->priv_data= s->iformat->priv_class;
av_opt_set_defaults(s->priv_data);
}
}
else
{
s->priv_data = NULL;
}
// List the devices for this context
AVDeviceInfoList* devlist = nullptr;
AVDictionary *tmp = nullptr;
av_dict_copy(&tmp, nullptr, 0);
if (av_opt_set_dict2(s, &tmp, AV_OPT_SEARCH_CHILDREN) < 0)
{
av_dict_free(&tmp);
avformat_free_context(s);
}
avdevice_list_devices(s, &devlist);
if (!devlist)
{
qWarning() << "avdevice_list_devices failed";
return devices;
}
// Convert the list to a QVector
devices.resize(devlist->nb_devices);
for (int i=0; i<devlist->nb_devices; i++)
{
AVDeviceInfo* dev = devlist->devices[i];
devices[i].first = dev->device_name;
devices[i].second = dev->device_description;
}
avdevice_free_list_devices(&devlist);
return devices;
}
