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[英]filling an audio buffer from an array of bytes and playing using a render callback
[英]Playing Audio using bytes fetched from webservice response
我收到以下文字
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在网络服务响应中,我想使用上述字节字符串播放音频。 我试过了
NSString *str=[TBXML textForElement:result];
str= [str stringByReplacingOccurrencesOfString:@" " withString:@""];
NSData *data= [[NSData alloc] init];
data = [str dataUsingEncoding:NSUTF8StringEncoding];
if (data)
[objApp.viewAya playAudio:data];
但是,播放器显示错误:操作无法完成。 请帮助我使用网络服务播放和下载字节数据中的音频。
这是代码
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
- (id)dataWithBase64EncodedString:(NSString *)string
{
if (string == nil)
[NSException raise:NSInvalidArgumentException format:nil];
if ([string length] == 0)
return [NSData data];
static char *decodingTable = NULL;
if (decodingTable == NULL)
{
decodingTable = malloc(256);
if (decodingTable == NULL)
return nil;
memset(decodingTable, CHAR_MAX, 256);
NSUInteger i;
for (i = 0; i < 64; i++)
decodingTable[(short)encodingTable[i]] = i;
}
const char *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];
if (characters == NULL) // Not an ASCII string!
return nil;
char *bytes = malloc((([string length] + 3) / 4) * 3);
if (bytes == NULL)
return nil;
NSUInteger length = 0;
NSUInteger i = 0;
while (YES)
{
char buffer[4];
short bufferLength;
for (bufferLength = 0; bufferLength < 4; i++)
{
if (characters[i] == '\0')
break;
if (isspace(characters[i]) || characters[i] == '=')
continue;
buffer[bufferLength] = decodingTable[(short)characters[i]];
if (buffer[bufferLength++] == CHAR_MAX) // Illegal character!
{
free(bytes);
return nil;
}
}
if (bufferLength == 0)
break;
if (bufferLength == 1) // At least two characters are needed to produce one byte!
{
free(bytes);
return nil;
}
// Decode the characters in the buffer to bytes.
bytes[length++] = (buffer[0] << 2) | (buffer[1] >> 4);
if (bufferLength > 2)
bytes[length++] = (buffer[1] << 4) | (buffer[2] >> 2);
if (bufferLength > 3)
bytes[length++] = (buffer[2] << 6) | buffer[3];
}
realloc(bytes, length);
return [NSData dataWithBytesNoCopy:bytes length:length];
}
并以这种方式调用它:
NSData *try = (NSData*)[self dataWithBase64EncodedString:[dict objectForKey:@"Data"]];
imageview.image = [UIImage imageWithData:try];
希望能帮助到你....
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