[FFmpeg-user] how to Convert H.264 NAL format to annex b

[wqmffmpeg]

Dear all
      I hava a issue
      I want to Convert H.264 NAL format to annex b according to NAL unit length size
      there is a function below, but only works for NAL sizes 3-4
      Anyone could shed a light to me?
------------------------------------------------------------
/* This only works for NAL sizes 3-4 */
status_t convertNal2AnnexB(uint8_t *dst, size_t dst_size,
        uint8_t *src, size_t src_size, size_t nal_len_size)
{
    size_t i = 0;
    size_t nal_len = 0;
    status_t status = OK;

    CHECK_EQ(dst_size, src_size);
    CHECK(nal_len_size == 3 || nal_len_size == 4);

    while (src_size >= nal_len_size) {
        nal_len = 0;
        for( i = 0; i < nal_len_size; i++ ) {
            nal_len = (nal_len << 8) | src[i];
            dst[i] = 0;
        }
        dst[nal_len_size - 1] = 1;
        if (nal_len > INT_MAX || nal_len > src_size) {
            status = ERROR_MALFORMED;
            break;
        }
        dst += nal_len_size;
        src += nal_len_size;
        src_size -= nal_len_size;

        memcpy(dst, src, nal_len);

        dst += nal_len;
        src += nal_len;
        src_size -= nal_len;
    }

    return status;
}


2015-05-21 

wqmffmpeg 



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