Build ChatListUI

2025-12-22 22:25:57 +00:00 · 2020-02-22 15:38:54 +04:00
parent f57d6b6168
commit 5380b12805
1510 changed files with 643 additions and 309 deletions
--- a/submodules/FFMpegBinding/Sources/FFMpegSWResample.m
+++ b/submodules/FFMpegBinding/Sources/FFMpegSWResample.m
@@ -0,0 +1,75 @@
+#import <FFMpegBinding/FFMpegSWResample.h>
+
+#import <FFMpegBinding/FFMpegAVFrame.h>
+
+#import "libavcodec/avcodec.h"
+#import "libswresample/swresample.h"
+
+@interface FFMpegSWResample () {
+    SwrContext *_context;
+    NSUInteger _ratio;
+    NSInteger _destinationChannelCount;
+    enum FFMpegAVSampleFormat _destinationSampleFormat;
+    void *_buffer;
+    int _bufferSize;
+}
+
+@end
+
+@implementation FFMpegSWResample
+
+- (instancetype)initWithSourceChannelCount:(NSInteger)sourceChannelCount sourceSampleRate:(NSInteger)sourceSampleRate sourceSampleFormat:(enum FFMpegAVSampleFormat)sourceSampleFormat destinationChannelCount:(NSInteger)destinationChannelCount destinationSampleRate:(NSInteger)destinationSampleRate destinationSampleFormat:(enum FFMpegAVSampleFormat)destinationSampleFormat {
+    self = [super init];
+    if (self != nil) {
+        _destinationChannelCount = destinationChannelCount;
+        _destinationSampleFormat = destinationSampleFormat;
+        _context = swr_alloc_set_opts(NULL,
+                                      av_get_default_channel_layout((int)destinationChannelCount),
+                                      (enum AVSampleFormat)destinationSampleFormat,
+                                      (int)destinationSampleRate,
+                                      av_get_default_channel_layout((int)sourceChannelCount),
+                                      (enum AVSampleFormat)sourceSampleFormat,
+                                      (int)sourceSampleRate,
+                                      0,
+                                      NULL);
+        _ratio = MAX(1, destinationSampleRate / sourceSampleRate) * MAX(1, destinationChannelCount / sourceChannelCount) * 2;
+        swr_init(_context);
+    }
+    return self;
+}
+
+- (void)dealloc {
+    swr_free(&_context);
+    if (_buffer) {
+        free(_buffer);
+    }
+}
+
+- (NSData * _Nullable)resample:(FFMpegAVFrame *)frame {
+    AVFrame *frameImpl = (AVFrame *)[frame impl];
+    int bufSize = av_samples_get_buffer_size(NULL,
+                                             (int)_destinationChannelCount,
+                                             frameImpl->nb_samples * (int)_ratio,
+                                             (enum AVSampleFormat)_destinationSampleFormat,
+                                             1);
+    
+    if (!_buffer || _bufferSize < bufSize) {
+        _bufferSize = bufSize;
+        _buffer = realloc(_buffer, _bufferSize);
+    }
+    
+    Byte *outbuf[2] = { _buffer, 0 };
+    
+    int numFrames = swr_convert(_context,
+                                outbuf,
+                                frameImpl->nb_samples * (int)_ratio,
+                                (const uint8_t **)frameImpl->data,
+                                frameImpl->nb_samples);
+    if (numFrames <= 0) {
+        return nil;
+    }
+    
+    return [[NSData alloc] initWithBytes:_buffer length:numFrames * _destinationChannelCount * 2];
+}
+
+@end