Here is the objective-c sister question, which might provide some insight: c and objective-c -- const char* and char*
I am doing the following:
g_ADPCMstate.valprev=32767;
g_ADPCMstate.index=0;
const char *modulatedBytes1 = {0xca,0x82,0x00,0x00,0x80,0x80,0x80,0x80};
char *modulatedBytes = (char *)modulatedBytes1;
unsigned int moduleatedLength = 8;
short *decompressedBytes = NULL;
adpcm_decoder(modulatedBytes, decompressedBytes, moduleatedLength, &g_ADPCMstate);
The function declaration is:
void
adpcm_decoder(indata, outdata, len, state)
char indata[];
short outdata[];
int len;
struct adpcm_state *state;
g_ADPCMstate
is the global instance variable for a adpcm_state struct. http://codepad.org/5vyd0CXA is the full code. The function crashes when *outp++ = valprev;
happens and I get a BAD ACCESS statement from my debugger. outp is a pointer to outData while valprev is a long.
The problem has to be in my understanding of pointers and either modulatedBytes
and/or decompressedBytes
I have little understanding of C and lower level concepts. I would love some insight into my problem.
You pass short *decompressedBytes = NULL;
as the outdata
argument to adpcm_decoder()
, and then try to dereference it. Did you forget to allocate decompressedBytes
?
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