我使用lame編碼器在mac osx中使用objective-c和cocoa將wav轉換爲mp3。在音頻編碼方面,我是一個完全新手,而我的C技能並不好。無論我是否偶然發現並進入了實際的編碼階段,這就是我陷入困境的地方。EXC_BAD_ACCESS當調用lame_encode_buffer
從我研究過的代碼看來,我應該使用lame_encode_buffer
用於單聲道,lame_encode_buffer_interleaved
用於立體聲(儘管前者需要左右聲道的輸入使我感到困惑)。到目前爲止,我已經得到的代碼是:
-(BOOL)encodeWave:(Wave *)wav {
if(![self loadLibrary]) {
return FALSE;
}
lame_set_num_channels(lgf,[wav channels]);
lame_set_in_samplerate(lgf,[wav sampleRate]);
lame_set_out_samplerate(lgf,[wav sampleRate]);
lame_set_brate(lgf, [wav getBrateInK]);
lame_init_params(lgf);
//encode stuff!
int total_samples = ([wav data_length]/[wav bytesPerSample]);
int n_samples = total_samples/[wav channels];
Byte * inBuf = (Byte *)malloc([wav data_length]);
if(inBuf == NULL)
return FALSE;
memcpy(inBuf, [[wav data] bytes], [wav data_length]);
int outBuf_size = 7200 + (1.25*n_samples);
unsigned char * outBuf = (unsigned char *)malloc(outBuf_size);
if(outBuf == NULL)
return FALSE;
lame_encode_buffer(lgf,(short int *)inBuf,(short int *)inBuf, n_samples, outBuf, outBuf_size);
return TRUE;
}
-(BOOL)loadLibrary {
NSString * pathToLib = [LAME_LIB_LIKELY_LOC stringByAppendingPathComponent:LAME_LIB_NAME];
if(![[NSFileManager defaultManager] fileExistsAtPath:pathToLib])
return FALSE;
void * lib_handle = dlopen("libmp3lame.dylib",RTLD_LOCAL|RTLD_LAZY);
if(!lib_handle)
return FALSE;
//Init
lgf = lame_init();
//set error processor
lame_set_errorf(lgf,errorHandler);
lame_set_debugf(lgf,errorHandler);
lame_set_msgf(lgf,errorHandler);
return TRUE;
}
我已經使用上INBUF測試代碼打印出所有的數據,它看起來正確的。當我在lame_encode_buffer
上有一箇中斷點時,所有的參數都被賦值爲正確的值(即沒有零指針)。
我猜這是更多的我使用錯誤的方法或給函數的錯誤類型的輸入,但沒有好的演練在這可用,我真的不知道。
編輯(回溯)
#0 0x96e6ae42 in __kill()
#1 0x96e6ae34 in kill$UNIX2003()
#2 0x96edd23a in raise()
#3 0x96ee9679 in abort()
#4 0x96ede3db in __assert_rtn()
#5 0x000938ca in convert_partition2scalefac_l (gfc=0x146ca000, eb=0xbfff3c38, thr=0xbfff3d3c, chn=0) at psymodel.c:498
#6 0x00097c0b in L3psycho_anal_ns (gfp=0x877000, buffer=0xbfff8cac, gr_out=0, ms_ratio=0x146d6eb4, ms_ratio_next=0xbfffcb9c, masking_ratio=0xbfffd390, masking_MS_ratio=0xbfffcbf0, percep_entropy=0xbfffcbb0, percep_MS_entropy=0xbfffcba0, energy=0xbfffcbc8, blocktype_d=0xbfffac24) at psymodel.c:1712
#7 0x00086fa0 in lame_encode_mp3_frame (gfp=0x877000, inbuf_l=0x146ca010, inbuf_r=0x146cde50, mp3buf=0x877800 "", mp3buf_size=9537) at encoder.c:374
#8 0x0008a6e1 in lame_encode_frame (gfp=0x877000, inbuf_l=0x0, inbuf_r=0x0, mp3buf=0x0, mp3buf_size=0) at lame.c:1364
#9 0x0008ab57 in lame_encode_buffer_sample_t (gfp=0x877000, buffer_l=0x146f5000, buffer_r=0x160c0000, nsamples=0, mp3buf=0x877800 "", mp3buf_size=9537) at lame.c:1541
#10 0x0008ad6e in lame_encode_buffer (gfp=0x877000, buffer_l=0xbfffdcb0, buffer_r=0xbfffe5b0, nsamples=576, mp3buf=0x877800 "", mp3buf_size=9537) at lame.c:1591
#11 0x0008ca3f in lame_encode_flush (gfp=0x877000, mp3buffer=0x877000 "\377\377\377\377\001", mp3buffer_size=9537) at lame.c:1869
#12 0x00011d25 in -[MP3EncodingService encodeWave:] (self=0x1d96e0, _cmd=0x14c9f, wav=0x14712460) at /Users/tim/sp/MP3EncodingService.m:50
#13 0x0000edfb in -[LibraryController convert:] (self=0x1887f0, _cmd=0x15046, sender=0x198480) at /Users/tim/sp/LibraryController.m:908
#14 0x93a794cb in -[NSApplication sendAction:to:from:]()
#15 0x93a79408 in -[NSControl sendAction:to:]()
#16 0x93a7928e in -[NSCell _sendActionFrom:]()
#17 0x93a788e7 in -[NSCell trackMouse:inRect:ofView:untilMouseUp:]()
#18 0x93a7813a in -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:]()
#19 0x93a779f4 in -[NSControl mouseDown:]()
#20 0x93a76133 in -[NSWindow sendEvent:]()
#21 0x93a42cd9 in -[NSApplication sendEvent:]()
#22 0x939a062f in -[NSApplication run]()
#23 0x9396d834 in NSApplicationMain()
#24 0x0000292c in main (argc=1, argv=0xbffff748) at /Users/tim/sp/main.m:13
運行這一點 - 當你得到一個崩潰,然後使用「BT」命令來獲得回溯。 – 2010-02-24 13:45:03
我已將它添加進去。雖然看不到任何有用的東西。 – Septih 2010-02-24 14:05:48
該解決方案適合您嗎?如果是這樣,請接受。否則,告訴我們在你遵循1.2.3點後發生了什麼,所以我們可以給予更多的幫助。 – 2010-03-07 13:58:42