feat(client): add iOS client and fix video download issue

- Introduced a new iOS client configuration (`IOSClient`) with device
model, user agent, and updated version key.
- Updated `innertubeClient` and `clientInfo` to include `deviceModel`
for better compatibility.
- Changed the default client from `AndroidClient` to `IOSClient`.
- Commented out `playerParams` in the video data request, addressing
video download issues.
- Minor code cleanup to improve readability.

client.go

@@ -7,13 +7,12 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log/slog"
 	"math/rand"
 	"net/http"
 	"net/url"
 	"strconv"
 	"sync/atomic"
-
-	"log/slog"
 )
 
 const (
@@ -24,12 +23,10 @@ const (
 	playerParams = "CgIQBg=="
 )
 
-var (
-	ErrNoFormat = errors.New("no video format provided")
-)
+var ErrNoFormat = errors.New("no video format provided")
 
 // DefaultClient type to use. No reason to change but you could if you wanted to.
-var DefaultClient = AndroidClient
+var DefaultClient = IOSClient
 
 // Client offers methods to download video metadata and video streams.
 type Client struct {
@@ -159,6 +156,7 @@ type innertubeClient struct {
 	UserAgent         string `json:"userAgent,omitempty"`
 	TimeZone          string `json:"timeZone"`
 	UTCOffset         int    `json:"utcOffsetMinutes"`
+	DeviceModel       string `json:"deviceModel,omitempty"`
 }
 
 // client info for the innertube API
@@ -168,6 +166,7 @@ type clientInfo struct {
 	version        string
 	userAgent      string
 	androidVersion int
+	deviceModel    string
 }
 
 var (
@@ -188,6 +187,15 @@ var (
 		androidVersion: 30,
 	}
 
+	// IOSClient Client based brrrr.
+	IOSClient = clientInfo{
+		name:        "IOS",
+		version:     "19.45.4",
+		key:         "AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8",
+		userAgent:   "com.google.ios.youtube/19.45.4 (iPhone16,2; U; CPU iOS 18_1_0 like Mac OS X;)",
+		deviceModel: "iPhone16,2",
+	}
+
 	// EmbeddedClient, not really tested.
 	EmbeddedClient = clientInfo{
 		name:      "WEB_EMBEDDED_PLAYER",
@@ -203,7 +211,7 @@ func (c *Client) videoDataByInnertube(ctx context.Context, id string) ([]byte, e
 		Context:        prepareInnertubeContext(*c.client),
 		ContentCheckOK: true,
 		RacyCheckOk:    true,
-		Params:         playerParams,
+		// Params:                   playerParams,
 		PlaybackContext: &playbackContext{
 			ContentPlaybackContext: contentPlaybackContext{
 				// SignatureTimestamp: sts,
@@ -230,6 +238,7 @@ func prepareInnertubeContext(clientInfo clientInfo) inntertubeContext {
 			HL:                "en",
 			GL:                "US",
 			TimeZone:          "UTC",
+			DeviceModel:       clientInfo.deviceModel,
 			ClientName:        clientInfo.name,
 			ClientVersion:     clientInfo.version,
 			AndroidSDKVersion: clientInfo.androidVersion,
@@ -427,7 +436,6 @@ func (c *Client) downloadChunked(ctx context.Context, req *http.Request, w *io.P
 				return
 			case data := <-chunks[i].data:
 				_, err := io.Copy(w, bytes.NewBuffer(data))
-
 				if err != nil {
 					abort(err)
 				}