【需求】支持可动态更新码率。

project/iPhone/LWAVFoundation/LWAVFoundation/AVFoundation/LWVideoEncoder.h

@@ -39,9 +39,9 @@ typedef NS_ENUM(NSUInteger, LWVideoEncodeStatus) {
 
 - (LWVideoEncodeStatus)reconfig:(LWVideoEncoderConfig*)config;
 
-- (LWVideoEncodeStatus)setOptionWithInt32:(NSString*)key value:(int32_t)value;
+- (LWVideoEncodeStatus)setOptionWithInt32:(const NSString*)key value:(int32_t)value;
 
-- (LWVideoEncodeStatus)getOptionWithInt32:(NSString*)key value:(int32_t*)value;
+- (LWVideoEncodeStatus)getOptionWithInt32:(const NSString*)key value:(int32_t*)value;
 
 @end
 

project/iPhone/LWAVFoundation/LWAVFoundation/AVFoundation/LWVideoEncoder.m

 #import <Foundation/Foundation.h>
 #import "LWVideoEncoder.h"
+#import "LWVideoOptions.h"
 
 @interface LWVideoEncoder ()
 {
@@ -59,6 +60,23 @@ void compressSessionOutputCallback(void *opaque,
     return kLWVideoEncodeStatus_Success;
 }
 
+- (LWVideoEncodeStatus)setOptionWithInt32:(const NSString*)key value:(int32_t)value {
+    LWVideoEncodeStatus status = kLWVideoEncodeStatus_Success;
+    // 动态更新码率
+    if ([key isEqual:kLWVideoOptions_Bitrate]) {
+        _config.bitrate = value;
+        [self setBitrate:value];
+        NSLog(@"%s:%d dynamic bitrate %d", __func__, __LINE__, value);
+    } else {
+        status = kLWVideoEncodeStatus_Err_NO_Support;
+    }
+    return status;
+}
+
+- (LWVideoEncodeStatus)getOptionWithInt32:(const NSString*)key value:(int32_t*)value {
+    return kLWVideoEncodeStatus_Err_NO_Support;
+}
+
 - (void)dealloc {
     [self destroySession];
 }

project/iPhone/LWAVFoundation/LWAVFoundation/ViewController/CaptureViewController.m

@@ -4,11 +4,17 @@
 #import "LWCheckBoxView.h"
 #import "LWVideoCaptureSession.h"
 #import "LWVideoEncoder.h"
+#import "LWVideoOptions.h"
 
-@interface CaptureViewController () <LWVideoCaptureSessionDelegate, LWCheckBoxViewDelegate, LWVideoEncoderDelegate>
+@interface CaptureViewController () <LWVideoCaptureSessionDelegate, LWCheckBoxViewDelegate, LWVideoEncoderDelegate, UITextFieldDelegate>
 @property (strong, nonatomic) UIView* displayView;
 @property (strong, nonatomic) LWCheckBoxView* checkBoxView;
 @property (strong, nonatomic) UILabel* captureTypeLabel;
+
+@property (strong, nonatomic) UILabel* encodeBitRateLabel;
+@property (strong, nonatomic) UITextField* encodeBitRateField;
+@property (strong, nonatomic) UIButton* encodeBitRateSettedBtn;
+
 @property (strong, nonatomic) UIButton* startBtn;
 @property (strong, nonatomic) UIButton* stopBtn;
 
@@ -24,10 +30,11 @@
 @implementation CaptureViewController
 
 - (void) viewDidLoad {
+    CGRect bounds = [UIScreen mainScreen].bounds;
     int displayViewX = 0;
     int displayViewY = 20;
     int displayViewW = [UIScreen mainScreen].bounds.size.width;
-    int displayViewH = displayViewW / 16 * 9;
+    int displayViewH = displayViewW / 16 * 12;
     self.hatsuneMiKuColor = [UIColor colorWithRed:(0x39 * 1.0 / 0xff) green:(0xc5 * 1.0 / 0xff) blue:(0xbb * 1.0 / 0xff) alpha:1.0];
     self.displayView = [[UIView alloc] initWithFrame:CGRectMake(displayViewX, displayViewY, displayViewW, displayViewH)];
     self.displayView.backgroundColor = [UIColor blackColor];
@@ -52,7 +59,32 @@
     self.captureTypeLabel.textColor = [UIColor blackColor];
     [self.view addSubview:self.captureTypeLabel];
     
-    self.startBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, checkBoxViewY + checkBoxViewH + 10, [UIScreen mainScreen].bounds.size.width / 2, 30)];
+    int bitrateLabelX = 0;
+    int bitrateLabelY = checkBoxViewY + checkBoxViewH + 10;
+    int bitrateLabelW = 60;
+    int bitrateLabelH = 30;
+    int bitrateBtnW = 90;
+    self.encodeBitRateLabel = [[UILabel alloc] initWithFrame:CGRectMake(bitrateLabelX, bitrateLabelY, bitrateLabelW, bitrateLabelH)];
+    self.encodeBitRateLabel.text = @"码率:";
+    self.encodeBitRateLabel.backgroundColor = [UIColor whiteColor];
+    self.encodeBitRateLabel.textColor = [UIColor blackColor];
+    [self.view addSubview:self.encodeBitRateLabel];
+    
+    self.encodeBitRateField = [[UITextField alloc] initWithFrame:CGRectMake(bitrateLabelX + bitrateLabelW, bitrateLabelY, bounds.size.width - bitrateBtnW - bitrateLabelX - bitrateLabelW, 30)];
+    self.encodeBitRateField.backgroundColor = [UIColor whiteColor];
+    self.encodeBitRateField.textColor = [UIColor blackColor];
+    self.encodeBitRateField.text = @"2000";
+    self.encodeBitRateField.delegate = self;
+    [self.view addSubview:self.encodeBitRateField];
+    
+    self.encodeBitRateSettedBtn = [[UIButton alloc] initWithFrame:CGRectMake(bounds.size.width - bitrateBtnW, bitrateLabelY, bitrateBtnW, 30)];
+    [self.encodeBitRateSettedBtn setTitle:@"设置" forState:UIControlStateNormal];
+    [self.encodeBitRateSettedBtn setBackgroundColor:[UIColor whiteColor]];
+    [self.encodeBitRateSettedBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
+    [self.encodeBitRateSettedBtn addTarget:self action:@selector(setBitrateSender:) forControlEvents:UIControlEventTouchUpInside];
+    [self.view addSubview:self.encodeBitRateSettedBtn];
+    
+    self.startBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, bitrateLabelY + bitrateLabelH + 10, [UIScreen mainScreen].bounds.size.width / 2, 30)];
 //    self.startBtn.enabled = YES;
     [self.startBtn setTitle:@"start" forState:UIControlStateNormal];
     [self.startBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
@@ -64,7 +96,7 @@
     [self.startBtn.layer setBorderColor:[UIColor blackColor].CGColor];
     [self.view addSubview:self.startBtn];
     
-    self.stopBtn = [[UIButton alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width / 2, checkBoxViewY + checkBoxViewH + 10, [UIScreen mainScreen].bounds.size.width / 2, 30)];
+    self.stopBtn = [[UIButton alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width / 2, bitrateLabelY + bitrateLabelH + 10, [UIScreen mainScreen].bounds.size.width / 2, 30)];
 //    self.startBtn.enabled = YES;
     [self.stopBtn setTitle:@"stop" forState:UIControlStateNormal];
     [self.stopBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
@@ -114,6 +146,16 @@
     self.encoder = nil;
 }
 
+- (IBAction)setBitrateSender:(id)sender {
+    NSString* bitStr = self.encodeBitRateField.text;
+    int bitrate = [bitStr intValue];
+    if (self.encoder) {
+        [self.encoder setOptionWithInt32:kLWVideoOptions_Bitrate value:bitrate];
+    } else {
+        self.encoderConfig.bitrate = bitrate;
+    }
+}
+
 #pragma mark LWVideoCaptureSessionDelegate
 - (void)onVideoWithSampleBuffer:(CMSampleBufferRef)sampleBuffer {
     if (self.encoder) {
@@ -137,4 +179,9 @@
         sampleBuffer:(CMSampleBufferRef)sampleBuffer {
 }
 
+#pragma mark UITextFieldDelegate
+- (BOOL)textFieldShouldReturn:(UITextField *)textField{
+    return [self.encodeBitRateField resignFirstResponder];
+}
+
 @end