WhyCan Forum(哇酷开发者社区)

Memory Usage
ROM = 13446 Bytes (const globals)
RAM = 23816 Bytes (heap)
Total Data Memory = 37262 Bytes
Code Size = 21000 Bytes (approximately - depends on compiler)

可以先在Windows下用电脑编译试一试, 毕竟MSVC调试更方便。

#define READBUF_SIZE 4000
char readBuf[READBUF_SIZE];
short output[READBUF_SIZE*10];

int main()
{
    HMP3Decoder hMP3Decoder;
    MP3FrameInfo mp3FrameInfo;
    hMP3Decoder = MP3InitDecoder();
    if (hMP3Decoder == 0)
    {
        // This means the memory allocation failed. This typically happens if there is not
        // enough heap memory. Recompile the code with additional heap memory.
        while (1);
    }

    char* input = &readBuf[0];

    FILE* mp3File = fopen("d:\\tkzc.mp3", "rb");

    /* Reset counters */
    int bytesLeft = 0;
    int outOfData = 0;
    char* readPtr = readBuf;

    int br = fread(readBuf, 1, READBUF_SIZE, mp3File);
    bytesLeft += br;

    if ((br <= 0)) return -1;

    while (1)
    {
        /* find start of next MP3 frame - assume EOF if no sync found */
        int offset = MP3FindSyncWord(readPtr, bytesLeft);
        if (offset < 0)
        {
            outOfData = 1;
            break;
        }
        else
        {
            readPtr += offset;                         //data start point
            bytesLeft -= offset;                 //in buffer
            int errs = MP3Decode(hMP3Decoder, &readPtr, &bytesLeft, output, 0);

            if (bytesLeft < READBUF_SIZE)
            {
                memmove(readBuf, readPtr, bytesLeft);
                int br = fread(readBuf + bytesLeft, 1, READBUF_SIZE - bytesLeft, mp3File);
                if ((br <= 0)) break;

                if (br < READBUF_SIZE - bytesLeft)
                    memset(readBuf + bytesLeft + br, 0, READBUF_SIZE - bytesLeft - br);
                bytesLeft = READBUF_SIZE;
                readPtr = readBuf;
            }

            MP3GetLastFrameInfo(hMP3Decoder, &mp3FrameInfo);
        }
    }
    fclose(mp3File);

}