1. Prerequisites
1.1. Before you begin
-
Create an application in the Model Studio console.
-
Click
Skills/Instructions and enable Volume Settings.
2. Develop client-side features
2.1. SDK directory and file structure
After you decompress the SDK package, the relevant files and directories are structured as follows.
For more information, see Device-side C SDK.
qwen_sdk/
├── include
│ ├── c_mmi_cmd
│ │ ├──c_mmi_cmd_volume.h
│ │ ├──c_mmi_cmd.h
│ │ └── ...
├── libs
│ ├── libc_mmi_cmd_volume.a
│ ├── libc_mmi_cmd.a
│ └── ...
└── ...
To enable volume control, load the libc_mmi_cmd.a and libc_mmi_cmd_volume.a static library files.
2.2. Sample code
The SDK abstracts the volume control feature into the following five events.
// Enumerations for volume setting commands.
enum {
C_MMI_CMD_VOLUME_UNKNOWN = 0,
C_MMI_CMD_VOLUME_INCREASE,
C_MMI_CMD_VOLUME_DECREASE,
C_MMI_CMD_VOLUME_SET,
C_MMI_CMD_VOLUME_MUTE,
C_MMI_CMD_VOLUME_UNMUTE
};
// Parameters for volume setting commands.
typedef struct {
uint32_t value;
uint32_t type;
} c_mm_volume_param_t;
In a multi-modal link, c_mm_volume_param_t.type specifies the volume type. You can typically ignore this parameter. The enumerations are as follows:enum {
C_MM_CMD_TYPE_UNKNOWN = 0,
C_MM_CMD_TYPE_SYSTEM, // System
C_MM_CMD_TYPE_MEDIA, // Media
C_MM_CMD_TYPE_CALL // Call
};
The c_mm_volume_param_t.value parameter ranges from 0 to 100. The application layer determines how this value maps to the actual device volume.If c_mm_volume_param_t.value is C_MMI_CMD_VALUE_UNDEFINED, the volume is adjusted by a default amount. The application layer determines this default amount.
#include "c_mmi_cmd.h"
#include "c_mmi_cmd_volume.h"
static int32_t _cmd_vol_callback(uint32_t event, char *req_id, void *p)
{
c_mm_volume_param_t *param = (c_mm_volume_param_t *)p;
(void)req_id;
switch (event) {
case C_MMI_CMD_VOLUME_SET:
UTIL_LOG_I("set volume to [%u] for [%u]", param->value, param->type);
break;
case C_MMI_CMD_VOLUME_INCREASE:
UTIL_LOG_I("increase volume by [%u] for [%u]", param->value, param->type);
break;
case C_MMI_CMD_VOLUME_DECREASE:
UTIL_LOG_I("decrease volume by [%u] for [%u]", param->value, param->type);
break;
case C_MMI_CMD_VOLUME_MUTE:
UTIL_LOG_I("mute");
break;
case C_MMI_CMD_VOLUME_UNMUTE:
UTIL_LOG_I("unmute");
break;
default:
UTIL_LOG_W("invalid volume command");
return UTIL_ERR_FAIL;
break;
}
return UTIL_SUCCESS;
}
int32_t main(void)
{
int32_t err = c_mmi_cmd_volume_register(_cmd_vol_callback);
if (err) {
UTIL_LOG_E("volume not loaded");
}
return 0;
}
